AD7732 datasheet(13/32 Pages) AD

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AD7732

Rev. 0 | Page 13 of 32

Pin No.

Mnemonic

Description

SYNC/P1

SYNC/Digital Input/Digital Output. The pin direction is determined by the P1 DIR bit;

the digital value can be read/written as the P1 bit in the I/O port register. When the

SYNC bit in the I/O port register is set to 1, the SYNC/P1 pin can be used to synchronize

the AD7732 modulator and digital filter with other devices in the system. The digital

voltage is referenced to analog supplies. When configured as an input, the pin should be

tied high or low.

RA, in association with RB and BIAS0(+), can be used to level shift the positive analog

input 0. In normal circuit configuration, this pin is left open circuit.

RB, in association with RA and BIAS0(+), can be used to level shift the positive analog

input 0. In normal circuit configuration, this pin is left open circuit.

BIAS1(+)

This input is used to level shift the positive analog input 1. This signal is used to ensure

that the differential signal seen by the internal buffer amplifier is within its common-

mode range. BIAS pins will normally be connected to 2.5 V.

AIN1(+)

Positive Analog Input Channel 1.

AIN0(+)

Positive Analog Input Channel 0.

BIAS0(+)

Voltage Bias for Positive Analog Input 0. This pin has the same function as BIAS1(+).

BIAS0(–)

Voltage Bias for Negative Analog Input 0. This pin has the same function as BIAS1(+).

AIN0(–)

Negative Analog Input Channel 0.

AIN1(–)

Negative Analog Input Channel 1.

BIAS1(–)

Voltage Bias for Negative Analog Input 1. This pin has the same function as BIAS1(+).

RC, in association with RD and BIAS0(–), can be used to level shift the negative analog

input 0. In normal circuit configuration, this pin is left open circuit.

RD, in association with RC and BIAS0(–), can be used to level shift the negative analog

input 0. In normal circuit configuration, this pin is left open circuit.

REFIN(+)

Positive Terminal of the Differential Reference Input. REFIN(+) voltage potential can lie

anywhere between AVDD and AGND. In normal circuit configuration, this pin should be

connected to a 2.5 V reference voltage.

REFIN(–)

Negative Terminal of the Differential Reference Input. REFIN(–) voltage potential can lie

anywhere between AVDD and AGND. In normal circuit configuration, this pin should be

connected to a 0 V reference voltage.

AGND

Ground Reference Point for Analog Circuitry.

RDY

Logic Output. Used as a status output in both conversion mode and calibration mode. In

conversion mode, a falling edge on this output indicates that either any channel or all

channels have unread data available, according to the RDYFN bit in the I/O port register.

In calibration mode, a falling edge on this output indicates that calibration is complete

(see the Digital Interface Description section for more details).

DOUT

Serial data output with serial data being read from the output shift register on the part.

This output shift register can contain information from any AD7732 register, depending

on the address bits of the communications register.

DIN

Serial data input (Schmitt triggered) with serial data being written to the input shift

DVDD

Digital Supply Voltage, 3 V or 5 V Nominal.

DGND

Ground Reference Point for Digital Circuitry.

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