Datasheet

AD5700/AD5700-1 Data Sheet
Rev. F | Page 8 of 24
Pin No. Mnemonic Description
19 AGND Analog Circuitry Ground Reference Connection.
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
tied low, V
CC
must be greater than 2.7 V.
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 EPAD Exposed Pad. For typical operation, it is recommended to connect this pin to AGND.