National Instruments R Series User manual

USER MANUAL
NI PXIe-7861
R Series Reconfigurable I/O Module (AI, AO, DIO) for PXI Express,
16 AI, 8 AO, 32 DIO, 1 MS/s AIO, 512 MB DRAM,
Kintex-7 160T FPGA
This document provides compliance, pinout, connectivity, mounting, and power information
for the NI PXIe-7861.
Hardware Overview
The following high-level block diagram represents the NI PXIe-7861.
Figure 1. NI PXIe-7861 Block Diagram
Device
Temperature
NI ASIC
Kintex-7
FPGA
Flash
Memory
DIO
Data/
Address/
Control
Overvoltage
Protection
+5 V
Reference
AO
AO (x8)
DAC
ADC AI
AI (x8)
INA
DIO (x16)
DDR3 RAM 100 MHz
OSC
Overvoltage
Protection
Overvoltage
Protection
NI PXIe-7861
PXIe Connector
Overvoltage
Protection
+5 V
Reference
ADC
AI (x8)
INA
DIO (x16)
Overvoltage
Protection
AI
DIO
(RMIO)
CONNECTOR 1
(RMIO)
CONNECTOR 0

Pinout
TERMINAL 34 TERMINAL 1
TERMINAL 35
TERMINAL 68 TERMINAL 68
TERMINAL 34 TERMINAL 1
TERMINAL 35
+5V
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
DIO9
DIO11
DIO13
DIO15
AO7
AO6
AO5
AO4
AO3
AO2
AO1
AO0
AISENSE0
AI7+
AIGND6
AI6+
AI5+
AIGND4
AI4+
AI3+
AIGND2
AI2+
AI1+
AIGND0
AI0+
+5V
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DIO8
DIO10
DIO12
DIO14
AOGND7
AOGND6
AOGND5
AOGND4
AOGND3
AOGND2
AOGND1
AOGND0
NC
AI7–
AIGND7
AI6–
AI5–
AIGND5
AI4–
AI3–
AIGND3
AI2–
AI1–
AIGND1
AI0–
68 34
67 33
66 32
65 31
64 30
63 29
62 28
61 27
60 26
59 25
58 24
57 23
56 22
55 21
54 20
53 19
52 18
51 17
50 16
49 15
48 14
47 13
46 12
45 11
44 10
43 9
42 8
41 7
40 6
39 5
38 4
37 3
36 2
35 1
CONNECTOR 0
(RMIO)
+5V
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
DIO9
DIO11
DIO13
DIO15
NC
NC
NC
NC
NC
NC
NC
NC
AISENSE1
AI15+
AIGND14
AI14+
AI13+
AIGND12
AI12+
AI11+
AIGND10
AI10+
AI9+
AIGND8
AI8+
+5V
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DIO8
DIO10
DIO12
DIO14
NC
NC
NC
NC
NC
NC
NC
NC
NC
AI15-
AIGND15
AI14-
AI13-
AIGND13
AI12-
AI11-
AIGND11
AI10-
AI9-
AIGND9
AI8-
68 34
67 33
66 32
65 31
64 30
63 29
62 28
61 27
60 26
59 25
58 24
57 23
56 22
55 21
54 20
53 19
52 18
51 17
50 16
49 15
48 14
47 13
46 12
45 11
44 10
43 9
42 8
41 7
40 6
39 5
38 4
37 3
36 2
35 1
CONNECTOR 1
(RMIO)
Table 1. NI PXIe-7861 Signal Descriptions
Signal Description
AI+ Positive analog input signal connection
AI- Negative analog input signal connection
2| ni.com | NI PXIe-7861 User Manual

Table 1. NI PXIe-7861 Signal Descriptions (Continued)
Signal Description
AISENSE Reference connection for NRSE measurements
AIGND Ground reference for the analog input signal
AO Analog output signal connection
AOGND Ground reference for the analog output signal
DIO Digital input/output signal connection
DGND Ground reference for the digital signal
GND Ground connection
Supply (+5 Vout) 5 V power output connection for external devices
NC No connection
The NI PXIe-7861 is protected from overvoltage and overcurrent conditions.
Note Refer to the NI PXIe-7861 Specifications, available at ni.com/manuals for
more information.
Note The pinout label on the lid of the SCB-68A accessory is incompatible with
the NI PXIe-7861. Refer to the NI 78xxR Pinout Labels for the SCB-68A, available
at ni.com/manuals for the compatible pinout labels.
Connectivity Options
Use the following connection accessories and cables to access the signals on the I/O
connectors.
Table 2. Connection Accessories and Cables
Connector Type Accessory Description NI Part Number
RMIO
NI SCB-68A Noise Rejecting, Shielded I/O
Connector Block 782536-01
NI SHC68-68-
RMIO
RMIO Shielded Cable, 68 pin D-
Type to 68 pin VHDCI (1 m) 189588-01
RMIO Shielded Cable, 68 pin D-
Type to 68 pin VHDCI (2 m) 189588-02
NI PXIe-7861 User Manual | © National Instruments | 3

Analog Input
The NI PXIe-7861 provides connections for 16 AI channels. Each channel has an AI+ pin, AI-
pin, and AIGND pin to which you can connect both single-ended or differential voltage
signals. Use the AISENSE pin to connect non-referenced single-ended signals.
Connecting Single-Ended Voltage Signals
To connect referenced single-ended voltage signals to the NI PXIe-7861, you must connect the
voltage ground signal to AI GND in order to keep the common-mode voltage in the specified
range.
Figure 2. Connecting Referenced Single-Ended Signals to the NI PXIe-7861
PGIA ADC
AI+
NI PXIe-7861
Connection
Accessory
AISENSE
AIGND
V1
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
To connect non-referenced single-ended voltage signals to the NI PXIe-7861, you must
connect the voltage ground signal to AI SENSE in order to keep the common-mode voltage in
the specified range.
Figure 3. Connecting Non-Referenced Single-Ended Signals to the NI PXIe-7861
PGIA ADC
AI+
NI PXIe-7861
Connection
Accessory
AISENSE
AIGND
Vcm
V1
+
–
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
4| ni.com | NI PXIe-7861 User Manual

Connecting Differential Voltage Signals
You can connect grounded or floating differential signal sources to the NI PXIe-7861. Connect
the positive voltage signal to the AI+ and the negative voltage signal to AI-. To connect
grounded differential signals to the NI PXIe-7861, you must also connect the signal reference
to AI GND.
Figure 4. Connecting Grounded Differential Signals to the NI PXIe-7861
PGIA ADC
AI+
NI PXIe-7861
Connection
Accessory
AISENSE
AIGND
Vcm
V1
+
–
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
To connect floating differential signals to the NI PXIe-7861, you must connect the negative
and positive signals to AI GND through 1 MΩ resistors to keep the voltage within the
common-mode voltage range. If the voltage source is outside the common-mode voltage
range, the NI PXIe-7861 does not read data accurately.
Figure 5. Connecting Floating Differential Signals to the NI PXIe-7861
PGIA ADC
AI+
NI PXIe-7861
Connection
Accessory
AISENSE
AIGND
V1
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
Analog Output
The NI PXIe-7861 provides connections for eight analog output channels. Each channel has an
AO pin and AOGND pin to which you can connect a load.
NI PXIe-7861 User Manual | © National Instruments | 5

Figure 6. Connecting a Load
NI PXIe-7861
Connection
Accessory
AOGND
LOAD
AO
DAC
Digital I/O
The NI PXIe-7861 provides connections for 32 digital input/output (DIO) channels. Connector
0 and Connector 1 each contains 16 low-speed channels that can run up to 10 MHz signal
frequencies. Each connector has a fixed logic level of 3.3 V. You can configure each channel
as input or output.
Figure 7. Connecting to the DIO Channels
NI PXIe-7861
Power
FPGA
Connection
Accessory
DIO0
DIO1
DIO14
DIO15
Connecter 0 (RMIO)
1
Connection
Accessory
DIO0
DIO1
DIO14
DIO15
Connecter 1 (RMIO)
1
2
1. Low-speed signal frequencies up to 10 MHz with logic levels configured as 3.3 V.
2. LED
The DIO channels, which have overvoltage and undervoltage protection as well as over
current protection, connect to the FPGA . Refer to the device specifications on ni.com/manuals
for more information about the maximum voltage and current.
6| ni.com | NI PXIe-7861 User Manual

When the system powers on, the DIO channels are set as input low with pull-down resistors.
To set another power-on state, you can configure the NI PXIe-7861 to load a VI when the
system powers on. The VI can then set the DIO lines to any power-on state. Visit ni.com/info
and enter RSeries_PowerUpStates to learn more about configuring the power-up states
for the NI PXIe-7861.
All the DIO channels on each connector are routed with a 50 Ω characteristic trace impedance.
Route all external circuitry with a similar impedance to ensure best signal quality. NI
recommends performing signal integrity measurements to test the affect of signal routing with
the cable and connection accessory for your application.
Field Wiring Considerations
Environmental noise can seriously affect the measurement accuracy of the device if you do not
take proper care when running signal wire between signal sources and the device. The
following recommendations mainly apply to AI signal routing to the device, as well as signal
routing in general.
Take the following precautions to minimize noise pickup and maximize measurement
accuracy:
• Use differential AI connections to reject common-mode noise.
• Use individually shielded, twisted-pair wires to connect AI signals to the device. With
this type of wire, the signal attached to the positive and negative inputs are twisted
together and then covered with a shield. You then connect this shield only at one point to
the signal source ground. This kind of connection is required for signals traveling through
areas with large magnetic fields or high electromagnetic interference.
• Route signals to the device carefully. Keep cabling away from noise sources, such as
video monitors and analog signals.
Use the following recommendations for all signal connections to the NI PXIe-7861:
• Separate NI PXIe-7861 signal lines from high-current or high-voltage lines. These lines
can induce currents in or voltages on the NI PXIe-7861 signal lines if they run in parallel
paths at a close distance. To reduce the magnetic coupling between lines, separate them
by a reasonable distance if they run in parallel or run the lines at right angles to each
other.
• Do not run signal lines through conduits that also contain power lines.
• Protect signal lines from magnetic fields caused by electric motors, welding equipment,
breakers, or transformers by running them through special metal conduits.
+5 V Power Source
Use the +5 V terminals on the I/O connector supply +5 V referenced to DGND to power
external circuitry.
Caution Never connect the +5 V power terminals to analog or digital ground or
any other voltage source on the NI PXIe-7861 or any other device. Doing so can
NI PXIe-7861 User Manual | © National Instruments | 7

damage the device and the computer. National Instruments is not liable for damage
resulting from such a connection.
The power rating is 4.75 to 5.1 V DC at 0.5 A per connector.
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378045A-03 March 13, 2018