AD9689-2000EBZ datasheet(130/134 Pages) AD

130 / 134 page

AD9689

Data Sheet

Rev. A | Page 130 of 134

VREF/Analog Input Control Registers

Table 53.

Addr.

Name

Bit(s) Bit Name

Setting

Description

Reset Access

0x0701 DC offset

calibration control

(local)

[7:0] DC offset calibration

control

0x06

R/W

0x06

Disable.

0x86

Enable.

0x073B DC Offset

Calibration

Control 2 (local)

[7:0] DC offset calibration

accumulator reset

Synchronously reset dc offset calibration accumulator.

0xB7 R/W

0xB7

Accumulator held in reset (use when 0x0701 = 0x06).

0x37

Accumulator reset released (use when 0x0701 = 0x86).

0x18A6 VREF control

[7:1] Reserved

Reserved.

0x0

VREF control

0x0

R/W

Internal reference.

External reference.

0x18E3 External VCM buffer

control

Reserved

Reserved.

0x0

External VCM buffer

0x0

R/W

Disable.

Enable.

[5:0] External VCM buffer[5:0]

See the Input Common Mode section.

0x0

R/W

0x18E6 Temperature diode

export

[7:0] Temperature diode

location select

0x0

R/W

0x00

Central diode output. VREF pin = high-Z.

0x01

Central diode output. VREF pin = 1× diode voltage output.

0x02

Central diode output. VREF pin = 20× diode voltage output.

0x03

Central diode output. VREF pin = GND.

0x40

Channel A diode output. VREF pin = high-Z.

0x41

Channel A diode output. VREF pin = 1× diode voltage output.

0x42

Channel A diode output. VREF pin = 20× diode voltage output.

0x43

Channel A diode output. VREF pin = GND.

0x50

Channel B diode output VREF pin = high-Z.

0x51

Channel B diode output VREF pin = 1× diode voltage output.

0x52

Channel B diode output VREF pin = 20× diode voltage output.

0x53

Channel B diode output VREF pin = GND.

0x1908 Analog input

control (local)

[7:3] Reserved

Reserved.

0x0

Enable dc coupling

0x0

R/W

Analog input is optimized for ac coupling.

Analog input is optimized for dc coupling.

[1:0] Reserved

Reserved.

0x0

0x1910 Input full-scale

control (local)

[7:4] Reserved

Reserved.

0x0

[3:0] Full-scale voltage

Full-scale voltage setting.

0xD

R/W

1000

1.13 V p-p differential.

1001

1.25 V p-p differential.

1101

1.7 V p-p differential.

1110

1.81 V p-p differential.

1111

1.93 V p-p differential.

0000

2.04 V p-p differential.

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