AD7771 datasheet(17/99 Pages) AD

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AD7771

Data Sheet

Rev. 0 | Page 16 of 98

Pin No.

Mnemonic

Type

Direction

Description

AVSS1B

Supply

Negative Front-End Analog Supply for Channel 4 to Channel 7, Typical at

−1.65 V (Dual Supply) or AGND (Single Supply). Connect all the AVSSx pins to

the same potential.

AIN5+

Analog input

Input

Analog Input Channel 5, Positive.

AIN5−

Analog input

Input

Analog Input Channel 5, Negative.

AIN4+

Analog input

Input

Analog Input Channel 4, Positive.

AIN4−

Analog input

Input

Analog Input Channel 4, Negative.

REF_OUT

Reference

Output

2.5 V Reference Output. Connect a 100 nF capacitor on this pin if using the

internal reference.

AVSS2B

Supply

Negative Analog Supply. Connect all the AVSSx pins together.

AREG2CAP

Supply

Output

Analog LDO Output 2. Decouple this pin to AVSS2B with a 1 µF capacitor.

AVDD2B

Supply

Positive Analog Supply. Connect this pin to AVDD2A.

AVSS3

Supply

Negative Analog Ground. Connect all the AVSSx to the same potential.

FORMAT1

Digital input

Input

Output Data Frame 1. See Table 13 for more details.

FORMAT0

Digital input

Input

Output Data Frame 0. See Table 13 for more details.

CLK_SEL

Digital input

Input

Select Clock Source. See Table 12 for more details.

VCM

Analog output

Output

Common-Mode Voltage Output, Typical at (AVDD1x + AVSSx)/2.

AVDD2A

Supply

Input

Analog Supply from 2.2V to 3.6 V. AVSS2x must not be lower than AREGxCAP.

Connect this pin to AVDD2B.

AREG1CAP

Supply

Output

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

AVSS2A

Supply

Input

Negative Analog supply. Connect all the AVSSx pins to the same potential.

AVSS4

Supply

Negative SAR Analog Supply and Reference. Connect all AVSSx pins to the same

potential.

AVDD4

Supply

Positive SAR Analog Supply and Reference Source.

AUXAIN+

Analog input

Input

Positive SAR Analog Input Channel.

AUXAIN−

Analog input

Input

Negative SAR Analog Input Channel.

EPAD

Supply

Input

Exposed Pad. Connect the exposed pad to AVSSx.

AD7771 Datasheet(PDF) 17 Page - Analog Devices

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