AD7708 datasheet(13/44 Pages) AD

13 / 44 page

REV. 0

AD7708/AD7718

–13–

Pin No

Mnemonic

Function

Chip Select Input. This is an active low logic input used to select the AD7708/AD7718.

CS can

be used to select the AD7708/AD7718 in systems with more than one device on the serial bus or

as a frame synchronization signal in communicating with the device.

CS can be hardwired low,

allowing the AD7708/AD7718 to be operated in 3-wire mode with SCLK, DIN, and DOUT

used to interface with the device.

RDY

RDY is a logic low status output from the AD7708/AD7718. RDY is low when valid data exists

in the data register for the selected channel. This output returns high on completion of a read

operation from the data register. If data is not read,

RDY will return high prior to the next update

indicating to the user that a read operation should not be initiated. The

RDY pin also returns

low following the completion of a calibration cycle.

RDY does not return high after a calibration

until the mode bits are written to enabling a new conversion or calibration.

DOUT

Serial data output with serial data being read from the output shift register of the ADC. The output

shift register can contain data from any of the on-chip data, calibration or control registers.

DIN

Serial Data Input with serial data being written to the input shift register on the AD7708/AD7718

Data in this shift register is transferred to the calibration or control registers within the ADC

depending on the selection bits of the Communications register.

DGND

Ground Reference Point for the Digital Circuitry.

DVDD

Digital Supply Voltage, 3 V or 5 V Nominal.

XTAL2

Output from the 32 kHz Crystal Oscillator or Resonator Inverter.

XTAL1

Input to the 32 kHz Crystal Oscillator or Resonator Inverter.

PIN CONFIGURATION

TOP VIEW

(Not to Scale)

AD7708/

AD7718

AIN7

DGND

DVDD

XTAL2

XTAL1

AIN8

AVDD

AGND

RDY

DOUT

DIN

REFIN1(–)

REFIN1(+)

AIN1

AIN2

AIN3

AIN4

RESET

SCLK

AIN5

AINCOM

REFIN2(+)/AIN9

REFIN2(–)/AIN10

AIN6

AGND

AD7708 数据表(PDF) 13 Page - Analog Devices

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