National Instruments R Series User manual

USER MANUAL
NI PXIe-7865
R Series Reconfigurable I/O Module (AI, AO, TTL-compatible DIO) for
PXI Express, 2 AI, 24 AO, 32 TTL-compatible 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-7865.
Hardware Overview
The following high-level block diagram represents the NI PXIe-7865.
Figure 1. NI PXIe-7865 Block Diagram
Device
Temperature
NI ASIC
Flash
Memory
DIO
CONNECTOR 0
(RAIO)
CONNECTOR 1
(RDIO)
Data/
Address/
Control
Overvoltage
Protection
+5 V
Reference
AO
AO (x24)
DAC
ADC AI
AI (x2)
INA
DIO (x32)
DDR3 RAM 100 MHz
OSC
Overvoltage
Protection
Overvoltage
Protection
NI PXIe-7865
CONNECTOR 2
(RAO)
Overvoltage
Protection
(x8)
(x16)
PXIe Connector
Kintex-7
FPGA
Bus
Switch

Pinout
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
AO15
AO14
AO13
AO12
AO11
AO10
AO9
AO8
NC
AOCH23
NC
AOCH22
AOCH21
NC
AOCH20
AOCH19
NC
AOCH18
AOCH17
NC
AOCH16
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
AOGND15
AOGND14
AOGND13
AOGND12
AOGND11
AOGND10
AOGND9
AOGND8
NC
AOGND23
NC
AOGND22
AOGND21
NC
AOGND20
AOGND19
NC
AOGND18
AOGND17
NC
AOGND16
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 2
(RAO)
TERMINAL 68
TERMINAL 34 TERMINAL 1
TERMINAL 35
+5V
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
AO7
AO6
AO5
AO4
AO3
AO2
AO1
AO0
AISENSE
NC
GND
NC
NC
GND
NC
NC
GND
NC
AI1+
AIGND0
AI0+
+5V
GND
GND
GND
GND
GND
GND
GND
GND
NC
NC
NC
NC
AOGND7
AOGND6
AOGND5
AOGND4
AOGND3
AOGND2
AOGND1
AOGND0
NC
NC
GND
NC
NC
GND
NC
NC
GND
NC
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
(RAIO)
TERMINAL 34 TERMINAL 1
TERMINAL 35
TERMINAL 68
DIO30
GND
DIO28
GND
DIO26
GND
DIO24
GND
DIO22
GND
DIO20
GND
DIO18
GND
DIO16
GND
DIO14
GND
DIO12
GND
DIO10
GND
DIO8
GND
DIO6
GND
DIO4
GND
DIO2
GND
DIO0
GND
EXTCLKIN
GND
DIO31
DIO29
GND
GND
DIO25
GND
DIO23
GND
DIO27
GND
DIO21
GND
DIO19
GND
DIO17
GND
DIO15
GND
DIO13
GND
DIO11
GND
DIO9
GND
DIO7
GND
DIO5
GND
DIO3
GND
DIO1
GND
GND
GND
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
(RDIO)
TERMINAL 68
TERMINAL 34 TERMINAL 1
TERMINAL 35
Table 1. NI PXIe-7865 Signal Descriptions
Signal Description
AI+ Positive analog input signal connection
AI- Negative analog input signal connection
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
2| ni.com | NI PXIe-7865 User Manual

Table 1. NI PXIe-7865 Signal Descriptions (Continued)
Signal Description
DIO Digital input/output signal connection
EXTCLKIN External clock input source that can be used for source synchronous
acquisitions. The provided clock source must be stable and glitch-free.
GND Ground connection
Supply (+5 Vout) 5 V power output connection for external devices
NC No connection
The NI PXIe-7865 is protected from overvoltage and overcurrent conditions.
Note Refer to the NI PXIe-7865 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-7865. Refer to the NI 78xxR Pinout Labels for the SCB-68A, available
at ni.com/manuals for the compatible pinout labels.
Connecting the NI PXIe-7865
NI recommends using the following cables and accessories with the NI PXIe-7865:
NI PXIe-7865 User Manual | © National Instruments | 3

Table 2. Recommended Cables and Accessories
Connector Type Connector Block Cables
Analog I/O
Connector 0
(RAIO)
SCB-68A Noise
Rejecting, Shielded I/O
Connector Block
(782536-01)
• SHC68-68-RMIO Shielded Cable for the
Reconfigurable MIO Connector, 68-pin
D-Type to 68-pin VHDCI, 1 m
(189588-01)
• SHC68-68-RMIO Shielded Cable for the
Reconfigurable MIO Connector, 68-pin
D-Type to 68-pin VHDCI, 2 m
(189588-02)
Analog Output
Connector 2
(RAO)
Digital
Connector 1
(RDIO)
SCB-68 HSDIO Shielded
68-Pin Connector Block
for Reconfigurable DIO
& HSDIO Products
(782914-01)
• SHC68-C68-RDIO2 Shielded High
Speed Digital Cable for the
Reconfigurable DIO Connector, 1 m
(156166-01)
• SHC68-C68-RDIO2 Shielded High
Speed Digital Cable for the
Reconfigurable DIO Connector, 2 m
(156166-02)
Note The SCB-68A DIP switches must be set for Direct Feedthrough mode for use
with R Series devices. Visit ni.com/info and enter the Info Code scb68acables for
more information on the SCB-68A accessory.
Note NI is not liable for connections that exceed any of the maximum ratings of
input or output signals on the NI PXIe-7865 and on the computer chassis. Refer to
the NI PXIe-7865 Specifications, available at ni.com/info for the maximum input and
output ratings for each signal.
Analog Input
The NI PXIe-7865 provides connections for two 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-7865, you must connect the
voltage ground signal to AI GND in order to keep the common-mode voltage in the specified
range.
4| ni.com | NI PXIe-7865 User Manual

Figure 2. Connecting Referenced Single-Ended Signals to the NI PXIe-7865
PGIA ADC
AI+
NI PXIe-7865
Connection
Accessory
AISENSE
AIGND
V1
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
To connect non-referenced single-ended voltage signals to the NI PXIe-7865, 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-7865
PGIA ADC
AI+
NI PXIe-7865
Connection
Accessory
AISENSE
AIGND
Vcm
V1
+
–
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
Connecting Differential Voltage Signals
You can connect grounded or floating differential signal sources to the NI PXIe-7865. Connect
the positive voltage signal to the AI+ and the negative voltage signal to AI-. To connect
grounded differential signals to the NI PXIe-7865, you must also connect the signal reference
to AI GND.
NI PXIe-7865 User Manual | © National Instruments | 5

Figure 4. Connecting Grounded Differential Signals to the NI PXIe-7865
PGIA ADC
AI+
NI PXIe-7865
Connection
Accessory
AISENSE
AIGND
Vcm
V1
+
–
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
To connect floating differential signals to the NI PXIe-7865, 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-7865 does not read data accurately.
Figure 5. Connecting Floating Differential Signals to the NI PXIe-7865
PGIA ADC
AI+
NI PXIe-7865
Connection
Accessory
AISENSE
AIGND
V1
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
Analog Output
The NI PXIe-7865 provides connections for 24 analog output channels. Each channel has an
AO pin and AOGND pin to which you can connect a load.
6| ni.com | NI PXIe-7865 User Manual

Figure 6. Connecting a Load
NI PXIe-7865
Connection
Accessory
AOGND
LOAD
AO
DAC
Digital I/O
The NI PXIe-7865 provides connections for 32 digital input/output (DIO) channels. Connector
1 contains 32 high-speed DIO channels that can run up to 20 MHz signal frequencies. You can
configure each channel as input or output.
Each DIO line on the NI PXIe-7865 are TTL-compatible. When configured as inputs, they can
receive signals from 5 V TTL, 3.3 V LVTTL, and 3.3 V LVCMOS. When configured as
outputs, they can send signals to 5 V TTL, 3.3 V LVTTL, and 3.3 V LVCMOS devices.
Because the digital outputs can provide nominal output swing of 0 V to 3.3 V, which will meet
the 5 V TTL threshold for a digital logic high, despite not being at a 5 V logic level. Refer to
the device specifications on ni.com/manuals for more information.
Figure 7. Connecting to the DIO Channels
NI PXIe-7865
Power
FPGA
Connection
Accessory
DIO0
DIO1
DIO30
DIO31
Connector 1 (DIO)
1
2
1. High-speed signal frequencies up to 20 MHz that is compatible with 5 V TTL, 3.3 V LVTTL, and 3.3 V
LVCMOS.
2. LED
The DIO channels connect to the FPGA through digital bus switches, which have overvoltage
and undervoltage protection as well as over current protection with a Positive Thermal
Coefficient (PTC) resistor. Refer to the device specifications on ni.com/manuals for more
information about the maximum voltage and current.
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-7865 to load a VI when the
NI PXIe-7865 User Manual | © National Instruments | 7

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-7865.
All the high-speed DIO channels on Connector 1 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 effect 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-7865:
• Separate NI PXIe-7865 signal lines from high-current or high-voltage lines. These lines
can induce currents in or voltages on the NI PXIe-7865 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.
• To minimize signal-to-signal skew within each digital channel, maintain signal lines'
length within 1 inch of difference.
+5 V Power Source
Use the +5 V terminals on the I/O connector supply +5 V referenced to GND 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-7865 or any other device. Doing so can
8| ni.com | NI PXIe-7865 User Manual

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.
Worldwide Support and Services
The NI website is your complete resource for technical support. At ni.com/support, you have
access to everything from troubleshooting and application development self-help resources to
email and phone assistance from NI Application Engineers.
Visit ni.com/services for information about the services NI offers.
Visit ni.com/register to register your NI product. Product registration facilitates technical
support and ensures that you receive important information updates from NI.
NI corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas,
78759-3504. NI also has offices located around the world. For support in the United States,
create your service request at ni.com/support or dial 1 866 ASK MYNI (275 6964). For
support outside the United States, visit the Worldwide Offices section of ni.com/niglobal to
access the branch office websites, which provide up-to-date contact information.
NI PXIe-7865 User Manual | © National Instruments | 9

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378153A-03 January 12, 2020