AD5700/AD5700-1

Data Sheet

Rev. A | Page 8 of 20

Pin No.

Mnemonic

Description

20

XTAL2

Connection for External 3.6864 MHz Crystal. Do not connect to this pin if using the internal RC oscillator

(AD5700-1 only) or an external clock source.

21

XTAL1

Connection for External 3.6864 MHz Crystal or External Clock Source Input. Tie this pin to ground if using the

internal RC oscillator (AD5700-1 only).

22

DGND

Digital Circuitry Ground Reference Connection. For typical operation, it is recommended to connect this pin to

AGND.

23

REF_EN

Reference Enable. A high state enables the internal 1.5 V reference and buffer. A low state disables the internal

reference and input buffer, and a buffered external 2.5 V reference source must be applied at REF. If REF_EN is

24

FILTER_SEL

Band-Pass Filter Select. A high state enables the internal filter and the HART signal should be applied to the

HART_IN pin. A low state disables the internal filter and an external band-pass filter must then be connected at

the ADC_IP input pin. In this case, the HART signal should be applied to the ADC_IP pin.

EPAD

AGND

Analog Ground Reference Connection. For typical operation, it is recommended to connect this pin to AGND.