AD7266 datasheet(9/29 Pages) AD

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AD7266

Rev. B | Page 8 of 28

Pin No.

Mnemonic

Description

28, 30

DOUTB,

DOUTA

Serial Data Outputs. The data output is supplied to each pin as a serial data stream. The bits are clocked out on the

falling edge of the SCLK input and 14 SCLKs are required to access the data. The data simultaneously appears on

both pins from the simultaneous conversions of both ADCs. The data stream consists of two leading zeros

followed by the 12 bits of conversion data. The data is provided MSB first. If CS is held low for 16 SCLK cycles rather

than 14, then two trailing zeros will appear after the 12 bits of data. If CS is held low for a further 16 SCLK cycles on

either DOUTA or DOUTB, the data from the other ADC follows on the DOUT pin. This allows data from a simultaneous

conversion on both ADCs to be gathered in serial format on either DOUTA or DOUTB using only one serial port. See

the

section.

Serial Interface

VDRIVE

Logic Power Supply Input. The voltage supplied at this pin determines at what voltage the interface operates. This

pin should be decoupled to DGND. The voltage at this pin may be different than that at AVDD and DVDD but should

never exceed either by more than 0.3 V.

DVDD

Digital Supply Voltage, 2.7 V to 5.25 V. This is the supply voltage for all digital circuitry on the AD7266. The DVDD

and AVDD voltages should ideally be at the same potential and must not be more than 0.3 V apart even on a

transient basis. This supply should be decoupled to DGND.

EPAD

Exposed Pad. The exposed metal paddle on the bottom of the LFCSP package should be soldered to PCB ground.

AD7266 Datasheet(PDF) 9 Page - Analog Devices