PXIe-4468 Specifications

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Updated2023-03-21
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PXIe-4468 Specifications

Reference

Warranted specifications describe the performance of a model under stated operating conditions and are covered by the model warranty. Warranted specifications account for measurement uncertainties, temperature drift, and aging. Warranted specifications are ensured by design or verified during production and calibration.

Characteristics describe values that are relevant to the use of the model under stated operating conditions but are not covered by the model warranty.

Typical specifications describe the performance met by a majority of models.
Nominal specifications describe an attribute that is based on design, conformance testing, or supplemental testing.

Specifications are Typical unless otherwise noted.

Conditions

Specifications are valid for the range 0 °C to 55 °C unless otherwise noted.

Input Characteristics

Number of simultaneously sampled input channels

Input configuration

Differential or pseudodifferential (50 Ω between negative input and chassis ground), each channel independently software-selectable

Input coupling

AC or DC, each channel independently software selectable

A/D converter (ADC) resolution

24 bits

ADC type

Delta-sigma

Sample rates
Range	100 S/s to 250 kS/s
Resolution	Refer to Figure 1 for additional information.

ADC modulator sample rate

8.125 MS/s

FIFO buffer size

1,023 samples

Data transfers

Direct memory access (DMA), programmed I/O

Overvoltage Protection

All input configurations

±42.4 V peak^[1], minimum/warranted

Input Signal Range


Gain (dB)^*	Full-Scale Range^*, Minimum
Gain (dB)^*	V peak	V RMS (Sine Input)
30	±0.316	0.224
20	±1.00	0.707
10	±3.16	2.24
0	±10.0	7.07
-10	±31.6	22.4
-20	±42.4	30.0
^* Each input channel gain is independently software-selectable.

Common-Mode Range


Gain (dB)	Input	Configuration
Gain (dB)	Input	Differential (V peak)^*	Pseudodifferential (V peak)^*
0, 10, 20, 30	Positive input (+)	±12	±12
0, 10, 20, 30	Negative input (-)	±12	±10
-10, -20	Positive input (+)	±42.4	±42.4
-10, -20	Negative input (-)	±42.4	±10
^* Voltages with respect to chassis ground.

Gain Amplitude Accuracy

1 kHz input tone
T_cal^[2]^,^[3] ±5 °C	±0.025 dB maximum/warranted
Over full operating temperature range	±0.05 dB maximum/warranted

Input Transfer Characteristics

Offset (Residual DC)

Table 1. Offset, Maximum/Warranted
Gain (dB)	DC-Coupled Offset (±mV)^*,†, T_cal^‡ ±5 °C	DC-Coupled Offset (±mV)^*, Over Full Operating Temperature Range	AC-Coupled Offset (±mV), Over Full Operating Temperature Range
30	0.1	0.3	3.0
20	0.1	0.3	3.0
10	0.2	1.0	3.0
0	0.5	3.0	4.0
-10	2.0	10.0	10.0
-20	5.0	50.0	50.0
^* Source impedance ≤ 50 Ω. ^† Listed accuracy is valid for 30 days following a self-calibration. ^‡ T_cal = device temperature at which the last self-calibration was performed.

Input Amplifier Characteristics

Input Impedance


Input Impedance	Configuration
Input Impedance	Differential	Pseudodifferential
Between positive input and chassis ground	1 MΩ \|\| 210 pF	1 MΩ \|\| 210 pF
Between negative input and chassis ground	1 MΩ \|\| 210 pF	50 Ω

Common-Mode Rejection Ratio (CMRR)


Gain (dB)	Differential Configuration
Gain (dB)	DC-Coupled CMRR (dBc), ƒ_in ≤ 1 kHz	AC-Coupled CMRR (dBc), ƒ_in = 50 Hz or 60 Hz
30	120	90
20	110
10	100
0	90	80
-10, -20	60	75

Input Dynamic Characteristics

Bandwidth and Alias Rejection

Alias-free bandwidth (BW) (passband)	DC to lesser of 0.454 * ƒ_s or 101.536 kHz
Alias rejection	105 dBc

1378 — Figure 1. Sample Rate Resolution and Bandwidth

AI Filter Delay

Digital filter delay

Adjustable^[4]

Analog filter delay
0 dB gain	708 ns
10 dB gain	715 ns
20 dB gain	737 ns
30 dB gain	777 ns

AC Coupling

-3 dB cutoff frequency	0.8 Hz
-0.1 dB cutoff frequency	5.2 Hz

AI Flatness


Gain (dB)	ƒ_s = 250 kS/s
	DC-Coupled Flatness (dB)^*			AC-Coupled Flatness (dB)^*
	ƒ_in = 20 Hz to 20 kHz	ƒ_in > 20 kHz to 45 kHz	ƒ_in > 45 kHz to 100 kHz	ƒ_in > 30 Hz	ƒ_in > 30 Hz to 20 kHz	ƒ_in > 20 kHz to 45 kHz	ƒ_in > 45 kHz to 100 kHz
0, 10, 20, 30, (Maximum/Warranted)	±0.006	±0.025	±0.080	Refer to the following figure.	±0.006	±0.025	±0.080
0, 10, 20, 30, (Typical)	±0.005	±0.020	±0.070		±0.005	±0.020	±0.070
-10, -20, (Maximum/Warranted)	±0.20	±0.60	±1.00		±0.20	±0.60	±1.00
-10, -20, (Typical)	±0.10	±0.33	±0.55		±0.10	±0.33	±0.55
^* Relative to 1 kHz.

AI Interchannel Gain Mismatch


Gain (dB)	AC/DC Coupled Mismatch (dB)^*,†			AC-Coupled Mismatch (dB)^*
Gain (dB)	ƒ_in = 20 Hz to 20 kHz	ƒ_in > 20 kHz to 45 kHz	ƒ_in > 45 kHz to 100 kHz	ƒ_in= 5 Hz	ƒ_in = 10 Hz
30 (Maximum/Warranted)	0.008	0.009	0.020	0.010	0.005
30 (Typical)	0.002	0.004	0.010	0.005	0.002
20 (Maximum/Warranted)	0.007	0.009	0.016	0.010	0.005
20 (Typical)	0.002	0.004	0.010	0.005	0.002
10 (Maximum/Warranted)	0.007	0.009	0.015	0.010	0.005
10 (Typical)	0.002	0.004	0.010	0.005	0.002
0 (Maximum/Warranted)	0.007	0.009	0.015	0.010	0.005
0 (Typical)	0.002	0.004	0.010	0.005	0.002
-10, -20 (Maximum/Warranted)	0.100	0.250	0.400	0.010	0.005
-10, -20 (Typical)	0.050	0.125	0.200	0.005	0.002
^* Identical channel configurations. ^† Operating temperature within ±5 °C of the last self-calibration temperature.

AI Interchannel Phase Mismatch


Gain (dB)		AC/DC Coupled Mismatch^*			AC-Coupled Mismatch
Gain (dB)		ƒ_in = 20 Hz to 20 kHz	ƒ_in > 20 kHz to 45 kHz	ƒ_in > 45 kHz to 100 kHz	ƒ_in= 5 Hz	ƒ_in = 10 Hz
30	Maximum/ Warranted	0.12°	0.27°	0.60°	0.24°	0.12°
30	Typical	0.06°	0.13°	0.30°	0.12°	0.06°
20	Maximum/ Warranted	0.06°	0.14°	0.30°	0.24°	0.12°
20	Typical	0.03°	0.07°	0.15°	0.12°	0.06°
10	Maximum/ Warranted	0.06°	0.12°	0.25°	0.24°	0.12°
10	Typical	0.03°	0.06°	0.12°	0.12°	0.06°
0	Maximum/ Warranted	0.05°	0.11°	0.23°	0.24°	0.12°
0	Typical	0.02°	0.06°	0.12°	0.12°	0.06°
-10, -20	Maximum/ Warranted	1.20°	1.40°	2.00°	0.24°	0.12°
-10, -20	Typical	0.60°	0.70°	1.00°	0.12°	0.06°
^* Identical channel configurations.

Note Listed gain and phase mismatch specifications are valid for measurements made on channels on the same module. For measurements made on channels on different modules, the listed gain and phase mismatch specifications still apply, but are subject to the following conditions:

For gain matching, all modules must be properly warmed up and then self-calibrated. Refer to the Calibration section for the specified warm-up time.
For phase matching, all modules must be synchronized to a common timebase. To the listed specifications, add the following error: 360° × ƒ_in × clock skew. Refer to the Timing and Synchronization section for the maximum intermodule clock skew.
Gain specification applies only for two channels on the same board. For channels on different boards, gain mismatch is
$\sqrt{2} \times (G a i n e r r o r + f l a t n e s s)$
.

AI Phase Linearity


Gain (dB)	Linearity (deg)
Gain (dB)	ƒ_in = 20 Hz to 20 kHz	ƒ_in > 20 Hz to 100 kHz
0, 10, 20, 30	±0.005°	±0.03°
-20, -10	±0.1°	±1°

AI Idle Channel Noise


Gain (dB)		Idle Channel Noise (μV RMS)^*
		ƒ_s = 51.2 kS/s		ƒ_s = 250 kS/s
		20 Hz to 20 kHz	0.1 Hz to 23.2 kHz	20 Hz to 20 kHz	0.1 Hz to 101.563 kHz
30	Maximum/Warranted	1.3	1.6	1.3	2.8
30	Typical	1.1	1.2	1.1	2.4
20	Maximum/Warranted	1.5	1.6	1.5	3.4
20	Typical	1.3	1.4	1.3	2.9
10	Maximum/Warranted	2.8	3.0	2.8	7.0
10	Typical	2.3	2.5	2.3	5.2
0	Maximum/Warranted	8.0	9.0	8.0	18.0
0	Typical	6.3	6.8	6.3	14.0
-10	Maximum/Warranted	99.0	103.0	99.0	144.0
-10	Typical	74.0	80.0	74.0	108.0
-20	Maximum/Warranted	133.0	140.0	133.0	250.0
-20	Typical	94.0	100.0	94.0	170.0
^* Source impedance ≤50 Ω.

AI Spectral Noise Density

AI spectral noise density

7 nV/

\sqrt{H z}

at 30 dB gain, 1 kHz

AI Dynamic Range


Gain (dB)		Dynamic Range (dBFS)^*,†
		ƒ_s = 51.2 kS/s		ƒ_s = 250 kS/s
		Audio BW (20 Hz to 20 kHz)	Full BW (0.1 Hz to 23.2 kHz)	Audio BW (20 Hz to 20 kHz)	Full BW (0.1 Hz to 101.563 kHz)
30	Minimum/Warranted	105	104	105	98
30	Typical	106	105	106	99
20	Minimum/Warranted	113	112	113	106
20	Typical	115	114	115	108
10	Minimum/Warranted	118	117	118	110
10	Typical	119	119	119	113
0	Minimum/Warranted	119	117	119	111
0	Typical	121	120	121	114
-10	Minimum/Warranted	107	106	107	103
-10	Typical	109	109	109	106
-20	Minimum/Warranted	107	106	107	101
-20	Typical	110	109	110	105
^* 1 kHz input tone, -60 dBFS input amplitude. ^† Source impedance ≤50 Ω.

Representative Measurement FFTs (1 kHz)

Test conditions for all FFTs: Unaveraged computation of 65,536 samples, differential input configuration.

Representative Measurement FFTs (10 kHz)

Test conditions for all FFTs: Unaveraged computation of 262,144 samples, differential input configuration.

AI Spurious Free Dynamic Range (SFDR) with Harmonics


Gain (dB)	SFDR (dBc)^*, Differential Configuration
Gain (dB)	f_s = 51.2 kS/s and f_s = 250 kS/s
30	111
20	117
10	117
0	116
-10	126
-20	126
^* 1 kHz input tone, input amplitude is the lesser of -1 dBFS or 8.91 V peak. Includes harmonics.

AI Total Harmonic Distortion (THD), Balanced Source


Gain (dB)	THD (dBc)^*
	ƒ_s = 51.2 kS/s		ƒ_s = 250 kS/s
	ƒ_in = 1 kHz	ƒ_in = 20 Hz to 20 kHz	ƒ_in = 1 kHz	ƒ_in = 20 Hz to 20 kHz	ƒ_in > 20 kHz to 100 kHz
30	-115	-115	-115	-102	-97
20	-116	-115	-116	-106	-105
10	-116	-115	-116	-107	-107
0	-115	-116	-115	-111	-107
-10	-115	-116	-115	-107	-107
-20	-115	-110	-115	-115	-107
^* Input amplitude is the lesser of -1 dBFS or 8.91 V peak, differential configuration.

AI THD, Unbalanced Source


Gain (dB)	THD (dBc)^*
	ƒ_s = 51.2 kS/s		ƒ_s = 250 kS/s
	ƒ_in = 1 kHz	ƒ_in = 20 Hz to 20 kHz	ƒ_in = 1 kHz	ƒ_in = 20 Hz to 20 kHz	ƒ_in > 20 kHz to 100 kHz
30	-115	-107	-115	-101	-94
20	-116	-113	-116	-105	-100
10	-116	-115	-116	-107	-104
0	-111	-102	-111	-96	-89
-10	-115	-104	-115	-100	-99
-20	-115	-104	-115	-100	-99
^* Input amplitude is the lesser of -1 dBFS or 8.91 V peak, pseduodifferential configuration.

AI THD Plus Noise (THD+N), Balanced Source


Gain (dB)	THD + N (dBc)^*
	ƒ_s = 51.2 kS/s, Measurement BW = 0.1 Hz to 23.2 kHz		ƒ_s = 250 kS/s, Measurement BW = 0.1 Hz to 101.563 kHz
	ƒ_in = 1 kHz	ƒ_in = 20 Hz to 20 kHz	ƒ_in = 1 kHz	ƒ_in = 20 Hz to 20 kHz	ƒ_in > 20 kHz to 100 kHz
30	-102	-102	-95	-94	-93
20	-110	-110	-103	-101	-100
10	-112	-111	-108	-104	-104
0	-113	-112	-109	-107	-105
-10	-97	-97	-94	-94	-94
-20	-95	-94	-90	-90	-90
^* Input amplitude is the lesser of -1 dBFS or 8.91 V peak, differential configuration.

AI THD+N, Unbalanced Source


Gain (dB)	THD + N (dBc)^*
	ƒ_s = 51.2 kS/s, Measurement BW = 0.1 Hz to 23.2 kHz		ƒ_s = 250 kS/s, Measurement BW = 0.1 Hz to 101.563 kHz
	ƒ_in = 1 kHz	ƒ_in = 20 Hz to 20 kHz	ƒ_in = 1 kHz	ƒ_in = 20 Hz to 20 kHz	ƒ_in > 20 kHz to 100 kHz
30	-102	-101	-94	-93	-91
20	-110	-109	-103	-101	-98
10	-112	-111	-108	-104	-101
0	-110	-102	-108	-95	-89
-10	-97	-97	-94	-93	-92
-20	-94	-94	-90	-90	-89
^* Input amplitude is the lesser of -1 dBFS or 8.91 V peak, pseudodifferential configuration.

AI Intermodulation Distortion (IMD)

IMD^[5]
30 dB gain	-109 dBc
20 dB gain	-112 dBc
10 dB gain	-117 dBc
0 dB gain	-117 dBc
-10 dB gain	-117 dBc
-20 dB gain	-115 dBc

Crosstalk, Input Channel Separation


Gain (dB)	Channel Crosstalk (dBc)^*,†
Gain (dB)	ƒ_in = 1 kHz Signal	ƒ_in = 100 kHz
30	-140	-110
20	-145	-110
10	-145	-110
0	-145	-110
-10	-110	-80
-20	-110	-80
^* Input amplitude is the lesser of -1 dBFS or 8.91 V peak. ^† Source impedance ≤ 50 Ω.

Integrated Electronic Piezoelectric (IEPE)


Current Setting		IEPE Range
OFF	Typical	0 mA
4 mA	Minimum	3.858 mA
	Typical	4.031 mA
	Maximum/Warranted	4.205 mA
10 mA	Minimum	9.655 mA
	Typical	10.087 mA
	Maximum/Warranted	10.523 mA
20 mA	Minimum	19.247 mA
	Typical	20.107 mA
	Maximum/Warranted	20.976 mA

Each channel independently software-selectable.

Voltage compliance

24 V

Note Use the following equation to make sure that your configuration meets the IEPE voltage compliance range:

V_common-mode + V_bias ± V_full-scale + (I_IEPE × 50 Ω) must be 0 V to 24 V

where

V_common-mode is the common-mode voltage seen by the input channel,

V_bias is the DC bias voltage of the sensor,

V_full-scale is the AC full-scale voltage of the sensor, and

I_IEPE is the selected excitation setting.

Sensor open detection^[6] (software-readable)
4 mA	27.3 V
10 mA	26.9 V
20 mA	26.4 V

Sensor short detection^[6] (software-readable)
4 mA	1.4 V
10 mA	1.1 V
20 mA	0.6 V

Channel input impedance with IEPE enabled

1 MΩ || 270 pF, pseudodifferential

Output Characteristics

All analog output specifications are in 40 Ω termination mode unless otherwise noted.

Number of simultaneously sampled output channels

Output configuration

Differential or pseudodifferential (50 Ω between negative output and chassis ground), each channel independently software-selectable

Output coupling

D/A converter (DAC) resolution

24 bits

DAC type

Delta-sigma

Sample rates ( f_s)
Range	100 S/s to 200 kS/s
Resolution	Refer to the following figure.

FIFO buffer size	1,023 samples
Data transfers	Direct memory access (DMA), programmed I/O

AO Common-Mode Offset Control

Resolution	16 bits
Sample rate	Static
Range	0 V to 5 V

Output Signal Range

Table 2. Output Signal Range, Minimum/Warranted
Attenuation (dB)	Output Voltage Full-Scale Range^*
Attenuation (dB)	V peak	V RMS (Sine Output)
0	±10.0	7.07
10	±3.16	2.24
20	±1.0	0.707
30	±0.316	0.224
^* Each output channel attenuation is independently software-selectable.

Output load

600 Ω, minimum/warranted

Output Impedance


Output Terminals^*	40 Ω Termination Mode		600 Ω Termination Mode
Output Terminals^*	Differential	Pseudodifferential	Differential
Positive (+) to GND	2.6 kΩ	88 Ω	2.8 kΩ
Negative (-) to GND	2.6 kΩ	50 Ω	2.8 kΩ
Positive (+) to negative (-)	40 Ω	40 Ω	600 Ω
^* Each output channel impedance is independently software-selectable.

Overvoltage Protection


Output Terminals	Short-Circuit Duration	Overvoltage (V peak), Minimum/Warranted
AO+ to chassis GND	Indefinite	±42.4
AO- to chassis GND	Indefinite	±42.4
AO+ to AO-	Indefinite	±42.4

Output Transfer Characteristics

AO Offset (Residual DC)

Table 3. Offset, Maximum/Warranted
Attenuation (dB)	Differential		Common Mode
Attenuation (dB)	T_cal^* ±5 °C (mV)	Full Operating Temperature Range (mV)	T_cal^* ±5 °C (mV)
0	±1.0	±10.0	±6.0
10	±0.5	±5.0
20	±0.2	±2.0
30	±0.2	±1.0
^* T_cal = device temperature at which the last self-calibration was performed.

Common Mode Rejection Ratio (CMRR)

80 dB, typical

Gain (Amplitude Accuracy)

Specifications valid at any attenuation setting with a 1 kHz output signal.

Differential	±0.03 dB (T_cal ±5 °C), maximum/warranted; ±0.08 dB (full operating temperature range), maximum/warranted
Common mode	±0.075% (T_cal ±5 °C), maximum/warranted

(T_cal = device temperature at which the last self-calibration was performed.)

Output Dynamic Characteristics

Note

The following specifications apply to PXIe-4468 revision C, and later, of the mLXR and BNC variants. For the PXIe-4468 mXLR variant revision B (Part Number 131136B-21L) specifications, refer to https://www.ni.com/r/4468revb.

Passband and Image Rejection

Passband	DC to 0.454 * ƒ_s
Image rejection	100 dB minimum, 0.546 * ƒ_s < ƒ_image< (1.625 MHz - 0.546 * ƒ_s)

AO Filter Delay

Output delay^[7] (samples)
0.1 kS/s ≤ ƒ_s ≤ 10.0 kS/s	65
10.0 kS/s < ƒ_s ≤ 20.0 kS/s	67
20.0 kS/s < ƒ_s ≤ 30.0 kS/s	69
30.0 kS/s < ƒ_s ≤ 40.0 kS/s	71
40.0 kS/s < ƒ_s ≤ 50.0 kS/s	73
50.0 kS/s < ƒ_s ≤ 60.0 kS/s	75
60.0 kS/s < ƒ_s ≤ 70.0 kS/s	77
70.0 kS/s < ƒ_s ≤ 80.0 kS/s	80
80.0 kS/s < ƒ_s ≤ 90.0 kS/s	82
90.0 kS/s < ƒ_s ≤ 100.0 kS/s	84
100.0 kS/s < ƒ_s ≤ 110.0 kS/s	85
110.0 kS/s < ƒ_s ≤ 120.0 kS/s	87
120.0 kS/s < ƒ_s ≤ 130.0 kS/s	90
130.0 kS/s < ƒ_s ≤ 140.0 kS/s	92
140.0 kS/s < ƒ_s ≤ 150.0 kS/s	94
150.0 kS/s < ƒ_s ≤ 160.0 kS/s	97
160.0 kS/s < ƒ_s ≤ 170.0 kS/s	99
170.0 kS/s < ƒ_s ≤ 180.0 kS/s	101
180.0 kS/s < ƒ_s ≤ 190.0 kS/s	103
190.0 kS/s < ƒ_s ≤ 200.0 kS/s	106

AO Gain Flatness

Flatness, ƒ_s = 200 kS/s, maximum/warranted
20 Hz to 20 kHz	±0.008 dB
20 Hz to 90.6 kHz	±0.1 dB

AO Interchannel Gain Mismatch

20 Hz to 90.6 kHz

±0.1 dB, maximum/warranted; ±0.03 dB, typical

AO Interchannel Phase Mismatch

20 Hz to 20 kHz	0.03°, maximum/warranted; 0.01°, typical
20 Hz to 90.6 kHz	0.5°, maximum/warranted; 0.2°, typical

For gain matching, all modules must be properly warmed up. Refer to the Calibration section for the specified warm-up time.
For phase matching, all modules must be synchronized to a common timebase. To the listed specifications, add the following error: 360° × ƒ_in × clock skew. Refer to the Timing and Synchronization section for the maximum intermodule clock skew.
Gain specification applies only for two channels on the same board. For channels on different boards, gain mismatch is
$\sqrt{2} \times (G a i n e r r o r + f l a t n e s s)$
.

AO Phase Linearity

AO phase linearity for all attenuation settings and all output configurations.

20 Hz to 20 kHz	±0.01°
20 Hz to 90.6 kHz	±1.0°

AO Idle Channel Noise

Table 4. AO Idle Channel Noise, Differential
Range		Noise (µV RMS)
Range		20 Hz to 22.4 kHz	20 Hz to 100 kHz	20 Hz to 500 kHz
0 dB	Maximum/Warranted	8.5	22.0	220.0
0 dB	Typical	5.0	11.0	200.0
10 dB	Maximum/Warranted	2.7	8.0	130.0
10 dB	Typical	1.7	4.0	62.0
20 dB	Maximum/Warranted	1.2	4.0	40.0
20 dB	Typical	0.8	2.0	20.0
30 dB	Maximum/Warranted	0.8	3.0	15.0
30 dB	Typical	0.6	1.2	7.0

Table 5. AO Idle Channel Noise, Pseudodifferential
Range		Noise (µV RMS)
Range		20 Hz to 22.4 kHz	20 Hz to 100 kHz	20 Hz to 500 kHz
0 dB	Maximum/Warranted	8.5	22.6	220.0
0 dB	Typical	5.0	11.3	200.0
10 dB	Maximum/Warranted	4.0	13.0	140.0
10 dB	Typical	2.6	5.7	70.0
20 dB	Maximum/Warranted	3.1	11.0	50.0
20 dB	Typical	2.2	4.7	40.0
30 dB	Maximum/Warranted	3.0	10.0	45.0
30 dB	Typical	2.1	4.5	35.0

Dynamic Range

Table 6. AO Dynamic Range, Differential
Range		Dynamic Range (dB)
Range		20 Hz to 22.4 kHz	20 Hz to 100 kHz	20 Hz to 500 kHz
0 dB	Minimum/Warranted	118	110	90
0 dB	Typical	123	116	91
10 dB	Minimum/Warranted	118	108	84
10 dB	Typical	122	114	91
20 dB	Minimum/Warranted	115	104	84
20 dB	Typical	118	110	90
30 dB	Minimum/Warranted	108	97	83
30 dB	Typical	111	105	90

Table 7. AO Dynamic Range, Pseudodifferential
Range		Dynamic Range (dB)
Range		20 Hz to 22.4 kHz	20 Hz to 100 kHz	20 Hz to 500 kHz
0 dB	Minimum/Warranted	118	109	90
0 dB	Typical	123	115	91
10 dB	Minimum/Warranted	114	104	84
10 dB	Typical	118	111	90
20 dB	Minimum/Warranted	107	96	83
20 dB	Typical	110	103	86
30 dB	Minimum/Warranted	97	86	73
30 dB	Typical	100	93	76

Spectral Noise Density


Attenuation (dB)	Spectral Noise Density (nV / √Hz)^*
	ƒ_s = 200 kS/s
	Differential	Pseudodifferential
0	37.0	39.0
10	13.0	19.0
20	5.1	15.0
30	3.5	15.0
^* Spectral noise density at 1 kHz.

AO Spectral Noise Density Performance

Measurement Instrument: PXIe-4480, 0.5V range, differential input configuration. Acquisition: 128 cross-spectrum averages of 1,048,576 samples acquired at 1.25 MS/s.

Spurious Free Dynamic Range (SFDR) with Harmonics

All attenuation settings, 20 Hz to 100 kHz, ƒ_s = 200 kS/s, differential^[8]^,^[9]

109 dBc

AO Representative Performance FFTs

Measurement Instrument: Audio Precision APx555 audio analyzer, differential input configuration.

Acquisition: high-performance sine mode, 16 averages of 1.2 MS at 1.24 MS/s, AP equiripple window.

Total Harmonic Distortion (THD)


Attenuation (dB)	THD (dBc)^*,†,‡, 25 °C ±5 °C
	ƒ_s = 200 kS/s
	20 Hz to 22.4 kHz Bandwidth		20 Hz to 100 kHz Bandwidth
	1 kHz	20 Hz to 10 kHz	1 kHz	20 Hz to 20 kHz	20 Hz to 100 kHz
0, 10, 20, 30	-109	-106	-109	-106	-106
^* -1 dBFS output amplitude. ^† Includes the 2nd through the 11th harmonics. ^‡ All 40 Ω output configurations.

Figure 26. AO THD vs Frequency

AO Total Harmonic Distortion (THD) plus Noise

Table 8. AO THD+N, Differential
Attenuation (dB)	THD+N (dBc), 25 °C ±5 °C^*
	ƒ_s = 200 kS/s
	20 Hz to 22.4 kHz Bandwidth		20 Hz to 100 kHz Bandwidth			20 Hz to 500 kHz Bandwidth
	ƒ_out = 1 kHz	ƒ_out = 20 Hz to 10 kHz	ƒ_out = 1 kHz	ƒ_out = 20 Hz to 20 kHz	ƒ_out = 20 Hz to 90.6 kHz	ƒ_out = 20 Hz to 90.6 kHz
0	-108	-107	-108	-107	-106	-93
10	-108	-107	-108	-107	-106	-93
20	-106	-105	-106	-105	-105	-93
30	-103	-100	-99	-98	-98	-87
^* -1 dBFS output amplitude

Table 9. AO THD+N, Pseudodifferential
Attenuation (dB)	THD+N (dBc), 25 °C ±5 °C^*
	ƒ_s = 200 kS/s
	20 Hz to 22.4 kHz Bandwidth		20 Hz to 100 kHz Bandwidth			20 Hz to 500 kHz Bandwidth
	ƒ_out = 1 kHz	ƒ_out = 20 Hz to 20 kHz	ƒ_out = 1 kHz	ƒ_out = 20 Hz to 20 kHz	ƒ_out = 20 Hz to 90.6 kHz	ƒ_out = 20 Hz to 90.6 kHz
0	-107	-107	-107	-107	-104	-92
10	-106	-106	-106	-106	-106	-90
20	-105	-105	-100	-100	-100	-90
30	-98	-85	-90	-90	-90	-77
^* -1 dBFS output amplitude

AO Intermodulation Distortion (IMD)

IMD^[10]^,^[11]

-106 dBc

Crosstalk, Output-to-Output Channel Separation

All attenuation settings
1 kHz signal	-135 dBc
90.6 kHz signal	-110 dBc

Crosstalk, Output-to-Input Channel Separation


AI Gain (dB)	Channel Crosstalk (dBc)
AI Gain (dB)	ƒ_out = 1 kHz Signal	ƒ_out = 90.6 kHz
All	-140	-100

Pure Tone Sine Generator Characteristics

Frequency range	10 Hz to 22 kHz
Frequency resolution	<1 mHz
Settling time	90 cycles + 1 ms

Pure Tone Spurious Free Dynamic Range (SFDR) with Harmonics

SFDR
6.3 V RMS	130 dB
2.0 V RMS	130 dB
0.63 V RMS	130 dB
0.2 V RMS	120 dB

Pure Tone Representative Performance FFTs

Measurement Instrument: Audio Precision APx555 audio analyzer, differential input configuration.

Acquisition: high-performance sine mode, 16 averages of 1.2 MS at 1.24 MS/s, AP equiripple window.

Pure Tone Total Harmonic Distortion (THD)


V out	THD (dBc)^*,†
	ƒ_out = 1 kHz	ƒ_out = 10 Hz to 22 kHz
	ƒ_out = 1 kHz	10 Hz to 22.4 kHz Bandwidth	10 Hz to 100 kHz Bandwidth
6.3 V RMS	-129	-125	-120
2 V RMS	-128	-124	-120
0.63 V RMS	-125	-121	-116
0.2 V RMS	-120	-112	-110
^* -1 dBFS output amplitude. ^† Includes the 2nd through the 11th harmonics.

Pure Tone THD Performance

Pure Tone Total Harmonic Distortion (THD) plus Noise


V out	THD+N^*
	ƒ_out = 1 kHz		ƒ_out = 10 Hz to 22 kHz
	10 Hz to 22.4 kHz Bandwidth	10 Hz to 100 kHz Bandwidth	10 Hz to 22.4 kHz Bandwidth	10 Hz to 100 kHz Bandwidth
10 V peak ≥ V out > 3.16 V peak	-129 dBc + 4.6 µV RMS	-129 dBc + 11 µV RMS	-125 dBc + 4.6 µV RMS	-120 dBc + 11 µV RMS
3.16 V peak ≥ V out > 1 V peak	-128 dBc + 1.7 µV RMS	-128 dBc + 4.0 µV RMS	-124 dBc + 1.7 µV RMS	-120 dBc + 4.0 µV RMS
1 V peak ≥ V out > 0.316 V peak	-125 dBc + 0.8 µV RMS	-125 dBc + 2.0 µV RMS	-121 dBc + 0.8 µV RMS	-116 dBc + 2.0 µV RMS
0.316 V peak ≥ V out	-120 dBc + 0.6 µV RMS	-120 dBc + 1.5 µV RMS	-112 dBc + 0.6 µV RMS	-110 dBc + 1.5 µV RMS

Pure Tone THD+N Performance

Transducer Electronic Data Sheet (TEDS) Support

Supports Transducer Electronic Data Sheet (TEDS) according to the IEEE 1451 Standard

Class I, all module inputs

Note For more information about TEDs, go to ni.com/info and enter the Info Code rdteds.

Maximum load capacitance

10,000 pF

Frequency Timebase Characteristics

Accuracy

Using internal VCXO timebase
T_cal^[12] ±5 °C^[13]	±27 ppm maximum/warranted
Over full operating temperature range	±100 ppm maximum/warranted

Using external timebase

Equal to accuracy of external timebase

Triggers

Analog trigger
Purpose	Reference trigger only
Source	Any channel
Level	Full scale, programmable
Mode	Rising-edge or falling-edge with hysteresis, entering or leaving window
Resolution	24 bits

Digital trigger
Purpose	Start or reference trigger
Source	PFI0, PXI_Trig<0..7>, PXI_Star, PXIe_DStar<A..B>
Polarity	Rising or falling edge, software-selectable
Minimum pulse width	100 ns for PXI_Trig<0..7>, 20 ns for others

Output Timing Signals

Sources	Start Trigger Out, Reference Trigger Out, Sync Pulse Out
Destinations	PFI0, PXI_Trig<0..7>, PXIe_DStarC
Polarity	Software-selectable except for Sync Pulse Out (always active low)

PFI 0 (Front Panel Digital Trigger)

Input
Logic compatibility	3.3 V or 5 V
Input range	0 V to 5.5 V
V_IL	0.95 V maximum/warranted
V_IH	2.4 V minimum
Input impedance	10 kΩ
Overvoltage protection	±10 V peak

Output
Output range	0 V to 3.45 V
V_OL	0.33 V maximum/warranted at 5 mA
V_OH	2.8 V minimum at 5 mA
Output impedance	50 Ω
Output current	±5 mA maximum/warranted

General Specifications

This section lists general specification information for the PXIe-4468.

Bus Interface

Form factor	x1 PXI Express peripheral module, Specification rev 1.0 compliant
Slot compatibility	x1 and x4 PXI Express or PXI Express hybrid slots
DMA channels	2, analog input; 2, analog output

Timing and Synchronization

Number of timing engines^[14]

Reference clock source

Onboard clock, backplane PXIe_CLK100

Intermodule ADC, DAC clock skew^[15]
T_tb ±5 °C	23 ns maximum/warranted^[16]
Over full operating temperature range	30 ns maximum/warranted

Power Requirements

+3.3 V	+3.0 A, maximum, maximum/warranted
+12 V	+2.0 A, maximum, maximum/warranted

Physical

Dimensions (not including connectors)	16 cm x 10 cm (6.3 in. x 3.9 in.) 3U CompactPCI slot
Analog input/output connector	BNC female or Mini-XLR male
Digital trigger connector (PFI 0)	SMB male
Front-panel LEDs	2 (Access, Active), 4 (Active, per channel—<AI 0..1> and <AO 0..1>)
Weight	360 g (12.7 oz)
Measurement Category	I^[17]

Caution Do not use the PXIe-4468 for connections to signals or for measurements within Categories II, III, or IV.

Caution The protection provided by the PXIe-4468 can be impaired if it is used in a manner not described in this document.

Caution Clean the hardware with a soft, nonmetallic brush. Make sure that the hardware is completely dry and free from contaminants before returning it to service.

Environmental Characteristics

Temperature
Operating	0 °C to 55 °C
Storage	-40 °C to 71 °C

Humidity
Operating	10 to 90%, noncondensing
Storage	5% to 95%, noncondensing

Pollution Degree

Maximum altitude

2,000 m (at 25 °C ambient temperature)

Shock and Vibration
Operating vibration	5 Hz to 500 Hz, 0.3 g RMS
Non-operating vibration	5 Hz to 500 Hz, 2.4 g RMS
Operating shock	30 g, half-sine, 11 ms pulse

Calibration

External calibration interval	2 years
Warm-up time	15 minutes

¹ Voltages with respect to chassis ground.

² T_cal = device temperature at which the last self-calibration was performed.

³ Listed accuracy is valid for 30 days following a self-calibration.

⁴ Digital filter delay is compensated to 0 ns by default and adjustable in software.

⁵ CCIF 14 kHz + 15 kHz, each tone amplitude is the lesser of - 6 dBFS or 5 V peak.

⁶ Voltage between positive input (+) and negative input (-).

⁷ Output delay includes digital filter delay + analog backend delay.

⁸ 1 kHz output tone, -1 dBFS output amplitude. Includes harmonics.

⁹ Measurement Bandwidth = 20 Hz to 100 kHz.

¹⁰ CCIF 14 kHz + 15 kHz, each tone amplitude is -6 dBFS.

¹¹ Measurement Bandwidth = 20 Hz to 20 kHz.

¹² T_cal = ambient temperature at which the last self-calibration was performed.

¹³ Listed accuracy is valid for 30 days following a self-calibration.

¹⁴ Two timing engines are dedicated to analog input and two timing engines are dedicated to analog output. Channels can be arbitrarily grouped and assigned to timing engines of the same channel type. Timing engines can be independently synchronized, started, and stopped. All timing engines must use the same reference clock source. Refer to the module user manual for more details on the assignment of timing engines.

¹⁵ Valid between PXIe-4468 modules installed in the same chassis. Between PXIe-4468 modules in different chassis, add the potential skew in the PXI_CLK10 clock distribution. Refer to the appropriate chassis documentation for its clock skew specifications.

¹⁶ Listed accuracy is valid for 30 days following a timebase change. T_tb = ambient temperature at which the timebase source was last changed.

¹⁷ Measurement Categories CAT I and CAT O are equivalent. These test and measurement circuits are not intended for direct connections to the MAINS building installations of Measurement Categories CAT II, CAT III, CAT IV.

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