Analog Input - National Instruments NI PCIe-7857 User Manual

Signal
DIO
DGND
EXTCLKIN
GND
Supply (+5 V
out
NC
The PCIe-7857 is protected from overvoltage and overcurrent conditions.
Note
information.

Analog Input

The PCIe-7857 provides connections for eight 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 PCIe-7857, 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 PCIe-7857
+
V
1
–
Table 1. PCIe-7857 Signal Descriptions (Continued)
Digital input/output signal connection
Ground reference for the digital signal
External clock input source that can be used for source synchronous
acquisitions. The provided clock source must be stable and glitch-free.
Ground connection
) 5 V power output connection for external devices
No connection
Refer to the device specifications, available at
AI+
AI–
AISENSE
AIGND
Connection
Accessory
Description
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Overvoltage
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NI PCIe-7857