AD7265(RevB) 데이터 시트보기 (PDF) - Analog Devices

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AD7265
(Rev.:RevB)

Differential/Single-Ended Input, Dual 1 MSPS, 12-Bit, 3-Channel SAR ADC

Analog Devices 

AD7265

Data Sheet

Pin No.

27

28, 30

31

32

Mnemonic

SCLK

DOUTB, DOUTA

VDRIVE

DVDD

EPAD

Description

Serial Clock. Logic input. A serial clock input provides the SCLK for accessing the data from the AD7265. This

clock is also used as the clock source for the conversion process.

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 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 Serial Interface section.

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.

Digital Supply Voltage, 2.7 V to 5.25 V. This is the supply voltage for all digital circuitry on the AD7265. 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.

Exposed Pad. The exposed pad is located on the underside of the package. Connect the exposed pad to the

ground plane of the PCB using multiple vias.

Rev. B | Page 8 of 28

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