DATASHEET

NI 9775
4-Ch, ±10 V, 20 MS/s, 14-Bit Digitizer

• BNC connectivity
• High-speed measurements up to 20 MS/s/ch at
68 dB SNR
• High-resolution measurements up to 5 MS/s/ch at
74 dB SNR
• 14-bit resolution
• Built-in analog reference trigger
• 128 Mbits onboard memory

The NI 9775, a 4-channel digitizer, can measure transient phenomenon like faults in electrical
transmission lines from lightning strikes or structural failure events at 20 MS/s/ch. The
module's store and forward architecture allows up to 128 Mbits of measurement data to be sent
back to the controller and analyzed. The module has a built-in analog reference trigger, or you
can use CompactRIO and LabVIEW FPGA to develop an advanced trigger based on low-
speed streaming data for added flexibility.

• NI 9775
Kit Contents
• NI 9775 Getting Started Guide

Accessories • BNC Male to BNC Male Cables

NI C Series Overview

NI provides more than 100 C Series modules for measurement, control, and communication
applications. C Series modules can connect to any sensor or bus and allow for high-accuracy
measurements that meet the demands of advanced data acquisition and control applications.
• Measurement-specific signal conditioning that connects to an array of sensors and signals
• Isolation options such as bank-to-bank, channel-to-channel, and channel-to-earth ground
• -40 °C to 70 °C temperature range to meet a variety of application and environmental
needs
• Hot-swappable
The majority of C Series modules are supported in both CompactRIO and CompactDAQ
platforms and you can move modules from one platform to the other with no modification.

CompactRIO
CompactRIO combines an open-embedded architecture
with small size, extreme ruggedness, and C Series
modules in a platform powered by the NI LabVIEW
reconfigurable I/O (RIO) architecture. Each system
contains an FPGA for custom timing, triggering, and
processing with a wide array of available modular I/O to
meet any embedded application requirement.

CompactDAQ
CompactDAQ is a portable, rugged data acquisition platform
that integrates connectivity, data acquisition, and signal
conditioning into modular I/O for directly interfacing to any
sensor or signal. Using CompactDAQ with LabVIEW, you
can easily customize how you acquire, analyze, visualize, and
manage your measurement data.

2 | ni.com | NI 9775 Datasheet

Software
LabVIEW Professional Development System for Windows

• Use advanced software tools for large project development

• Generate code automatically using DAQ Assistant and Instrument
I/O Assistant
• Use advanced measurement analysis and digital signal processing
• Take advantage of open connectivity with DLLs, ActiveX,
and .NET objects
• Build DLLs, executables, and MSI installers

NI LabVIEW FPGA Module

• Design FPGA applications for NI RIO hardware

• Program with the same graphical environment used for desktop and
real-time applications
• Execute control algorithms with loop rates up to 300 MHz
• Implement custom timing and triggering logic, digital protocols, and
DSP algorithms
• Incorporate existing HDL code and third-party IP including Xilinx IP
generator functions
• Purchase as part of the LabVIEW Embedded Control and Monitoring
Suite

NI LabVIEW Real-Time Module

• Design deterministic real-time applications with LabVIEW

graphical programming
• Download to dedicated NI or third-party hardware for reliable
execution and a wide selection of I/O
• Take advantage of built-in PID control, signal processing, and
analysis functions
• Automatically take advantage of multicore CPUs or set
processor affinity manually
• Take advantage of real-time OS, development and debugging
support, and board support
• Purchase individually or as part of a LabVIEW suite

NI 9775 Datasheet | © National Instruments | 3

 Circuitry
Onboard
Software Clock Reference
Hardware 20 MHz Clock
Timing PLL

Chassis Backplane
Data
Analog FIR
Filter Filter High-
4.7 MHz Resolution Stream Continuous
4 M Engine Data
AI ADC
13.9 MHz High-Speed Record
Record
1 MΩ 24 pF N Engine

Analog Timing Onboard Acquisition

Filter Mode Memory Mode

NI 9775

Note The diagram shows one channel inside the NI 9775.

• The shell of the BNC connects to CHASSIS GND.

• The four channels of the NI 9775 share the clock circuit and operate simultaneously.
• The NI 9775 has two separate data engines operating simultaneously for each channel:
the continuous stream engine and triggered record engine.
• The module waits for a trigger event, fills the circular buffer with the configured set of
data (called a record), then streams the entire record from the module to the chassis.
• The analog filter allows you to select 10 MHz or 5 MHz bandwidth.
• The software-selectable digital decimation filter improves resolution and alias rejection.
• The ADC samples the analog signal continuously at 20 MS/s.

Timing Modes
The NI 9775 has two timing modes: high-speed and high-resolution. High-speed mode turns
off the digital decimation filter on all channels and enables you to set the analog filter per
channel. High-resolution mode turns on both the analog filter and digital decimation filter for
all channels.

Acquisition Modes
The NI 9775 has three acquisition modes: continuous mode, record mode, and advanced
mode. In continuous mode, the NI 9775 transfers real-time data to the chassis at an aggregate
rate of 4 MS/s across all channels. In record mode, the NI 9775 stores samples into onboard
memory at up to 20 MS/s then transfers the data to the chassis at a slower rate. In advanced

4 | ni.com | NI 9775 Datasheet

mode, the NI 9775 combines the functionality of continuous mode and record mode to enable
more complex triggering schemes based on the continuous data.
Note Advanced mode is only available on CompactRIO systems.

Related Information
Horizontal on page 11

NI 9775 Specifications
The following specifications are typical for the range -40 °C to 70 °C unless otherwise noted.

Caution Do not operate the NI 9775 in a manner not specified in this document.
Product misuse can result in a hazard. You can compromise the safety protection
built into the product if the product is damaged in any way. If the product is
damaged, return it to NI for repair.

Input Characteristics
Number of channels 4 (simultaneously sampled)
Input type Reference single-ended
Input impedance 1 MΩ
Input capacitance 24 pF
Input coupling DC
Input range
Nominal ±10 V
Typical ±11.3 V
Minimum ±10.04 V
ADC resolution 14 bits
Overvoltage protection ±30 V DC, safe operating area

NI 9775 Datasheet | © National Instruments | 5

 Figure 1. Safe Operating Area

35

Protection Limit
30
Measurement Range
25
Voltage (V)

20

15

10

0
0 5 10 15 20 25 30 35 40
Input Signal Frequency (MHz)

Table 1. DC Accuracy
Measurement Conditions Percent of Reading Percent of Range1
(Gain Error) (Offset Error)

Calibrated Maximum (-40 °C to 70 °C) ±1.7% ±0.49%

Typical (25 °C, ±5 °C) ±0.32% ±0.08%

Uncalibrated2 Maximum (-40 °C to 70 °C) ±4.0% ±4.0%

Typical (25 °C, ±5 °C) ±1.7% ±1.8%

DC gain drift ±140 ppm/°C

DC offset drift ±0.34 mV/°C
AC amplitude accuracy ±0.25 dB at 50 kHz
AC amplitude drift ±172 ppm/°C
Channel-to-channel crosstalk < -90 dB at 5 MHz
Timing modes (software-selectable) High-speed, high-resolution
Analog filter (software-selectable) 6th order low-pass Bessel

1 Range equals 10 V for absolute accuracy calcuations.

2 Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes
where the calibration constants stored in the module are not applied to the data.

6 | ni.com | NI 9775 Datasheet

Analog filter -3 dB bandwidth
High-speed mode with analog filter 13.9 MHz
disabled
High-speed mode with analog filter 4.7 MHz
enabled
High-resolution mode 2.36 MHz
Alias rejection in high-resolution mode 45 dB at 5 MS/s only

Figure 2. Frequency Response in High-Speed Mode with Analog Filter Disabled

0.5
0
-0.5
Amplitude (dB)

-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
10k 100k 1M 10M 20M
Frequency (Hz)

Figure 3. Frequency Response in High-Speed Mode with Analog Filter Enabled

10.0

–10.0
Amplitude (dB)

–20.0

–30.0

–40.0

–50.0

–60.0
10 k 100 k 1M 10 M 20 M
Frequency (Hz)

NI 9775 Datasheet | © National Instruments | 7

 Figure 4. Frequency Response in High-Resolution Mode

0.5
0
–0.5
Amplitude (dB)
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
10 k 100 k 1M 10 M
Frequency (Hz)

Figure 5. Idle Channel FFT in High-Speed Mode with Analog Filter Disabled (20 MS/s,
32,768 point FFT)

0
–10
–20
–30
Amplitude (dBFS)

–40
–50
–60
–70
–80
–90
–100
–110
–120
0 Hz 1 MHz 2 MHz 3 MHz 4 MHz 5 MHz 6 MHz 7 MHz 8 MHz 9 MHz 10 MHz
Frequency

8 | ni.com | NI 9775 Datasheet

Figure 6. Idle Channel FFT in High-Resolution Mode (1 MS/s, 32,768 point FFT)

0
–10
–20
–30
Amplitude (dBFS)

–40
–50
–60
–70
–80
–90
–100
–110
–120
0 100 200 300 400 500
Frequency (kHz)

Figure 7. Step Response

10
8

6
4
Amplitude (V)

–2
–4
–6 Analog Filter Off
–8 Analog Filter On

–10
–120 –100 –80 –60 –40 –20 0 20 40 60 80 100 120
Time (ns)

NI 9775 Datasheet | © National Instruments | 9

 Figure 8. Single-Tone Spectrum at (-1 dB FS, 2.45 MHz)

0
-10
-20
-30
Amplitude (dB)

-40
-50
-60
-70
-80
-90
-100
-110
0 1M 2M 3M 4M 5M 6M 7M 8M 9M 10M
Frequency (Hz)

Spurious free dynamic range (-60 dB FS input)

High-speed mode at 2.45 MHz 89 dB FS
High-resolution mode at 100 kHz 94 dB FS
Input to trigger delay
High-speed mode with analog filter 863 ns
disabled
High-speed mode with analog filter 950 ns
enabled
High-resolution mode 4.62 μs
Input delay (Continuous Mode)
High-speed mode with analog filter 913 ns
disabled
High-speed mode with analog filter 999 ns
enabled
High-resolution mode 4.67 µs
Noise
High-speed mode 2.8 mV RMS
High-resolution mode 1.4 mV RMS
Effective number of bits
High-speed mode 11 bits
High-resolution mode 12 bits

10 | ni.com | NI 9775 Datasheet

Signal-to-Noise ratio
High-speed mode 68 dB at 2.45 MHz
High-resolution mode 74 dB at 100 kHz
Total harmonic distortion at -1 dB FS input
High-speed mode with analog filter -62 dB FS
disabled at 2.45 MHz
High-speed mode with analog filter -69 dB FS
enabled at 1 MHz
High-resolution mode at 100 kHz and -75 dB FS
Channel-to-channel skew
Analog filter disabled 1.5 ns
Analog filter enabled 12.7 ns
LSB weight 1.385 mV/LSB

Horizontal
Sample clock source 20 MHz PLL
Maximum sample rate in record mode
High-speed mode 20 MS/s
High-resolution mode 5 MS/s

Figure 9. Phase Noise

–70

–80

–90
Phase Noise (dBc/Hz)

–100

–110

–120

–130

–140

–150

–160

–170
100 1k 10 k 100 k 1M 10 M
Frequency (Hz)

Timebase frequency 20 MHz

Timebase accuracy ±50 ppm

NI 9775 Datasheet | © National Instruments | 11

PLL reference clock source
Internal master timebase 12.8 MHz
Chassis OCLK 12.8 MHz

Data Rate in Record Mode

20 MS/s
�

Where
N ∈ {1, 2, 3, 4, 5, ..., 65,535} for high-speed mode
N ∈ {4, 8, 12, 16, 20, ..., 65,532} for high-resolution mode

Data Rate in Continuous Mode

20 MS/s
�

Where
M ∈ {5, 6, 7, 8, 9, ..., 65,535} with one channel enabled for high-speed mode
M ∈ {8, 12, 16, 20, 24, ..., 65,532} with one channel enabled for high-resolution mode
M ∈ {10, 11, 12, 13, 14, ..., 65,535} with two channels enabled for high-speed mode
M ∈ {12, 16, 20, 24, 28, ..., 65,532} with two channels enabled for high-resolution mode
M ∈ {15, 16, 17, 18, 19, ..., 65,535} with three channels enabled for high-speed mode
M ∈ {16, 20, 24, 28, 32, ..., 65,532} with three channels enabled for high-resolution
mode
M ∈ {20, 21, 22, 23, 24, ..., 65,535} with four channels enabled for high-speed mode
M ∈ {20, 24, 28, 32, 36, ..., 65,532} with four channels enabled for high-resolution mode

Trigger
Supported trigger modes Start and reference
Trigger types Analog edge, digital edge, and software
Trigger sources AI0 to AI3 and chassis backplane
Dead time 0 samples

Analog Edge Trigger

Trigger sources AI0 to AI3
Settings Level, slope, and hysteresis
Trigger uncertainty ≤ 1 sample
Rearm time 1 sample minimum

12 | ni.com | NI 9775 Datasheet

Waveform Specifications
Onboard memory size 128 Mbits
Minimum record length 16 samples
Minimum number of pre-trigger samples
CompactRIO 1
CompactDAQ 2
Minimum number of post-trigger samples
CompactRIO 1
CompactDAQ 2
Maximum number of records 32 records
Maximum number of samples per record3 222
2* −1
������ ���������

������ ���ℎ������
Record data transfer rate
Maximum4 4.7 MS/s
Typical 4 MS/s

Power Requirements
Power consumed from chassis
Active mode 0.9 W maximum
Sleep mode 52.5 μW maximum
Thermal dissipation (at 70 °C)
Active mode 1.06 W maximum
Sleep mode 3.65 mW maximum

3 The maximum number of samples per record is different for CompactRIO systems.
4 With all four channels enabled.

NI 9775 Datasheet | © National Instruments | 13

Safety Voltages
Connect only voltages that are within Measurement Category O.

Isolation
Channel-to-channel None
Channel-to-earth ground None

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

Caution Do not connect the NI 9775 to signals or use for measurements within
Measurement Categories II, III, or IV.

Physical Characteristics
If you need to clean the module, wipe it with a dry towel.

Tip For two-dimensional drawings and three-dimensional models of the C Series

module and connectors, visit ni.com/dimensions and search by module number.

Weight 172 g

Hazardous Locations
U.S. (UL) Class I, Division 2, Groups A, B, C, D, T4;
Class I, Zone 2, AEx nA IIC T4
Canada (C-UL) Class I, Division 2, Groups A, B, C, D, T4;
Class I, Zone 2, Ex nA IIC T4
Europe (ATEX) and International (IECEx) Ex nA IIC T4 Gc

Safety and Hazardous Locations Standards

This product is designed to meet the requirements of the following electrical equipment safety
standards for measurement, control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
• EN 60079-0:2012, EN 60079-15:2010
• IEC 60079-0: Ed 6, IEC 60079-15; Ed 4
• UL 60079-0; Ed 6, UL 60079-15; Ed 4
• CSA 60079-0:2011, CSA 60079-15:2012

Note For UL and other safety certifications, refer to the product label or the Online
Product Certification section.

14 | ni.com | NI 9775 Datasheet

Electromagnetic Compatibility
This product meets the requirements of the following EMC standards for electrical equipment
for measurement, control, and laboratory use:
• EN 61326-1 (IEC 61326-1): Class A emissions; Industrial immunity
• EN 55011 (CISPR 11): Group 1, Class A emissions
• EN 55022 (CISPR 22): Class A emissions
• EN 55024 (CISPR 24): Immunity
• AS/NZS CISPR 11: Group 1, Class A emissions
• AS/NZS CISPR 22: Class A emissions
• FCC 47 CFR Part 15B: Class A emissions
• ICES-001: Class A emissions

Note In the United States (per FCC 47 CFR), Class A equipment is intended for
use in commercial, light-industrial, and heavy-industrial locations. In Europe,
Canada, Australia and New Zealand (per CISPR 11) Class A equipment is intended
for use only in heavy-industrial locations.

Note Group 1 equipment (per CISPR 11) is any industrial, scientific, or medical
equipment that does not intentionally generate radio frequency energy for the
treatment of material or inspection/analysis purposes.

Note For EMC declarations and certifications, and additional information, refer to
the Online Product Certification section.

CE Compliance
This product meets the essential requirements of applicable European Directives, as follows:
• 2014/35/EU; Low-Voltage Directive (safety)
• 2014/30/EU; Electromagnetic Compatibility Directive (EMC)
• 2014/34/EU; Potentially Explosive Atmospheres (ATEX)

Online Product Certification

Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance
information. To obtain product certifications and the DoC for this product, visit ni.com/
certification, search by model number or product line, and click the appropriate link in the
Certification column.

NI 9775 Datasheet | © National Instruments | 15

Shock and Vibration
To meet these specifications, you must panel mount the system.

Operating vibration
Random (IEC 60068-2-64) 5 grms, 10 Hz to 500 Hz
Sinusoidal (IEC 60068-2-6) 5 g, 10 Hz to 500 Hz
Operating shock (IEC 60068-2-27) 30 g, 11 ms half sine; 50 g, 3 ms half sine;
18 shocks at 6 orientations

Environmental
Refer to the manual for the chassis you are using for more information about meeting these
specifications.

Operating temperature -40 °C to 70 °C

(IEC 60068-2-1, IEC 60068-2-2)
Storage temperature -40 °C to 85 °C
(IEC 60068-2-1, IEC 60068-2-2)
Ingress protection IP40
Operating humidity (IEC 60068-2-78) 10% RH to 90% RH, noncondensing
Storage humidity (IEC 60068-2-78) 5% RH to 95% RH, noncondensing
Pollution Degree 2
Maximum altitude 5,000 m

Indoor use only.

Environmental Management
NI is committed to designing and manufacturing products in an environmentally responsible
manner. NI recognizes that eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.
For additional environmental information, refer to the Minimize Our Environmental Impact
web page at ni.com/environment. This page contains the environmental regulations and
directives with which NI complies, as well as other environmental information not included in
this document.

Waste Electrical and Electronic Equipment (WEEE)

EU Customers At the end of the product life cycle, all NI products must be
disposed of according to local laws and regulations. For more information about
how to recycle NI products in your region, visit ni.com/environment/weee.

16 | ni.com | NI 9775 Datasheet

电子信息产品污染控制管理办法（中国 RoHS）
中国客户 National Instruments 符合中国电子信息产品中限制使用某些有害物
质指令(RoHS)。关于 National Instruments 中国 RoHS 合规性信息，请登录
ni.com/environment/rohs_china。(For information about China RoHS
compliance, go to ni.com/environment/rohs_china.)

Calibration
You can obtain the calibration certificate and information about calibration services for the
NI 9775 at ni.com/calibration.
Calibration interval 1 year

NI 9775 Datasheet | © National Instruments | 17

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trademarks for information on NI trademarks. Other product and company names mentioned herein are trademarks or
trade names of their respective companies. For patents covering NI products/technology, refer to the appropriate
location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patent Notice
at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices
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377101B-02 April 10, 2017