AD7771BCPZ datasheet(73/99 Pages) AD

73 / 99 page

AD7771

Data Sheet

Rev. 0 | Page 72 of 98

GENERAL USER CONFIGURATION 2 REGISTER

Address: 0x012, Reset: 0x09, Name: GENERAL_USER_CONFIG_2

SYNC puls e generated thru SPI

STARTb pin in the control m odule.

This bit is ANDed with the value on

generate a puls e in /SYNC_IN pin.

on STARTb pin in the control m odule,

This s ignal is ANDed with the value

0=Sinc3. 1=Sinc5

DOUT Drive Strength

11: Extra Strong.

10: Weak.

01: Strong.

00: Nom inal.

Sets SPI interface to read back SAR

res ult on SDO

SDO Drive Strength

11: Extra Strong.

10: Weak.

01: Strong.

00: Nom inal.

[7] RESERVED

[0] SPI_SYNC (R/W)

[6] FILTER_MODE (R/W)

[2:1] DOUT_DRIVE_STR (R/W)

[5] SAR_DIAG_MODE_EN (R/W)

[4:3] SDO_DRIVE_STR (R/W)

Table 62. Bit Descriptions for GENERAL_USER_CONFIG_2

Bits

Bit Name

Settings

Description

Reset

Access

RESERVED

Reserved.

0x0

R/W

FILTER_MODE

0 = Sinc3. 1 = Sinc5.

0x0

R/W

SAR_DIAG_MODE_EN

Sets SPI interface to read back SAR result on SDO.

0x0

R/W

[4:3]

SDO_DRIVE_STR

SDO Drive Strength.

0x1

R/W

Nominal.

Strong.

Weak.

Extra Strong.

[2:1]

DOUT_DRIVE_STR

DOUTx Drive Strength.

0x0

R/W

Nominal.

Strong.

Weak.

Extra Strong.

SPI_SYNC

Sync pulse generated through SPI.

0x1

R/W

This signal is AND’ed with the value on START pin in the control module to

generate a pulse in SYNC_IN pin.

This bit is AND’ed with the value on START pin in the control module.

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