AD7761BSTZ datasheet(20/76 Pages) AD

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Data Sheet

AD7761

Rev. A | Page 19 of 75

Pin No.

Mnemonic

Type1

Description

55, 56

FORMAT1,

FORMAT0

Format Selection Pins. Hardwire the FORMATx pins to the required values in pin control and SPI

control mode. These pins set the number of DOUTx pins used to output ADC conversion data. The

FORMATx pins are checked by the AD7761 on power-up; the AD7761 then remains in this data

output configuration.

PIN/SPI

Pin Control/SPI Control. This pin sets the control method.

Logic 0 = pin control mode for the AD7761. Pin control mode allows pin strapped configuration

of the AD7761 by tying logic input pins to the required logic levels. Tie the logic pins (MODE0 to

MODE4, DEC0 and DEC1, and FILTER) as required for the configuration.

Logic 1 = SPI control mode for the AD7761. Use the SPI control interface signals (CS, SCLK, SDI,

and SDO) for reading and writing to the AD7761 memory map.

CLK_SEL

Clock Select.

0 = pull this pin low for the CMOS clock option. The clock is applied to Pin 32 (connect Pin 31 to

DGND).

1 = pull this pin high for the crystal or LVDS clock option. The crystal or LVDS clock is applied to

Pin 31 and Pin 32. The LVDS option is available only in SPI control mode. A write is required to

enable the LVDS clock option.

VCM

Common-Mode Voltage Output. This pin outputs (AVDD1 − AVSS)/2, which is 2.5 V by default in

pin control mode. Configure this pin to (AVDD1 − AVSS)/2, 2.5 V, 2.14 V, or 1.65 V in SPI control

mode. When driving capacitive loads larger than 0.1 µF, it is recommended to place a 50 Ω series

resistor between this pin and the capacitive load for stability.

AVDD2A

Analog Supply Voltage. This pin is 2 V to 5.5 V with respect to AVSS.

REGCAPA

Analog LDO Regulator Output. Decouple this pin to AVSS with a 1 µF capacitor.

AVSS2A

Negative Analog Supply. This pin is nominally 0 V.

AIN0−

Negative Analog Input to ADC Channel 0.

AIN0+

Positive Analog Input to ADC Channel 0.

AI is analog input, P is power, DI/O is digital input/output, DI is digital input, DO is digital output, and AO is analog output.

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