AD7770 datasheet(71/98 Pages) AD

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AD7770

Data Sheet

Rev. C | Page 70 of 97

GENERAL USER CONFIGURATION 1 REGISTER

Address: 0x011, Reset: 0x24, Name: GENERAL_USER_CONFIG_1

If all SD channels are disabled, setting

this bit high allows DCLK to continue

toggling

Soft Reset

11: 1st write.

10: 2nd write.

01: No Effect.

00: No Effect.

Power Mode

1: High Resolution.

0: Low Power (1/4)

PowerDown signal for internal oscillator.

Active Low

PowerDown VCM Buffer. Active Low

PowerDown SA. Active Low

PowerDown Internal Reference Output

Buffer. Active Low

[7] ALL_CH_DIS__MCLK_EN (R/W)

[1:0] SOFT_RESET (R/W)

[6] POWERMODE (R/W)

[2] PDB_RC_OSC (R/W)

[5] PDB_VCM (R/W)

[3] PDB_SAR (R/W)

[4] PDB_REFOUT_BUF (R/W)

Table 62. Bit Descriptions for GENERAL_USER_CONFIG_1

Bits

Bit Name

Settings

Description

Reset

Access

ALL_CH_DIS_MCLK_EN

If all Σ-Δ channels are disabled, setting this bit high allows DCLK to

continue toggling.

0x0

R/W

POWERMODE

Power Mode.

0x0

R/W

Low power (1/4).

High resolution.

PDB_VCM

Power Down VCM Buffer. Active low.

0x1

R/W

PDB_REFOUT_BUF

Power Down Internal Reference Output Buffer. Active low.

0x0

R/W

PDB_SAR

Power Down SAR. Active low.

0x0

R/W

PDB_RC_OSC

Power Down Signal for Internal Oscillator. Active low.

0x1

R/W

[1:0]

SOFT_RESET

Soft Reset.

0x0

R/W

No effect.

2nd write.

1st write.

GENERAL USER CONFIGURATION 2 REGISTER

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

SYNC pulse generated thru SPI

STARTb pin in the control module.

This bit is ANDed with the value on

generate a pulse in /SYNC_IN pin.

on STARTb pin in the control module,

This signal is ANDed with the value

DOUT Drive Strength

11: Extra Strong.

10: Weak.

01: Strong.

00: Nominal.

Sets SPI interface to read back SAR

result on SDO

SDO Drive Strength

11: Extra Strong.

10: Weak.

01: Strong.

00: Nominal.

[7] RESERVED

[0] SPI_SYNC (R/W)

[6] RESERVED

[2:1] DOUT_DRIVE_STR (R/W)

[5] SAR_DIAG_MODE_EN (R/W)

[4:3] SDO_DRIVE_STR (R/W)

Table 63. Bit Descriptions for GENERAL_USER_CONFIG_2

Bits

Bit Name

Settings

Description

Reset

Access

[7:6]

RESERVED

Reserved.

0x0

R/W

SAR_DIAG_MODE_EN

Sets SPI to Read Back SAR Result on SDO.

0x0

R/W

AD7770 Datasheet(PDF) 71 Page - Analog Devices

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