Datasheet

AD7877 Data Sheet

Rev. D | Page 8 of 44

Pin No. Mnemonic Description

28 V

DRIVE

Logic Power Supply Input. The voltage supplied at this pin determines the operating voltage for the serial

interface of the AD7877.

29 ARNG When the DAC is in current output mode, a resistor from ARNG to GND sets the output range.

30 AOUT Analog Output Voltage or Current from DAC.

31 V

REF

Reference Output for the AD7877. The internal 2.5 V reference is available on this pin for use external to the

device. The reference output must be buffered before it is applied elsewhere in a system. To reduce system

noise effects, it is strongly recommended to place a capacitor of 100 nF between the V

REF

pin and GND.

Alternatively, an external reference can be applied to this input. The voltage range for the external reference is

1.0 V to V

. For the specified performance, it is 2.5 V on the AD7877.