EVAL-AD5700-1EBZ データシートの表示（PDF） - Analog Devices

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EVAL-AD5700-1EBZ

Low Power HART Modem

Analog Devices 

AD5700/AD5700-1

Data Sheet

Pin No. Mnemonic

18

VCC

19

AGND

20

XTAL2

21

XTAL1

22

DGND

23

REF_EN

24

FILTER_SEL

EPAD EPAD

Description

Power Supply Input. 1.71 V to 5.5 V can be applied to this pin. VCC should be decoupled to ground with low ESR

10 µF and 0.1 µF capacitors (see the Supply Decoupling section).

Analog Circuitry Ground Reference Connection.

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.

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).

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

AGND.

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, VCC must be greater than 2.7 V.

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.

The exposed paddle must be connected to AGND or DGND, or, alternatively, it can be left electrically

unconnected. It is recommended that the paddle be thermally connected to a copper plane for enhanced

thermal performance.

Rev. G | Page 8 of 24

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