AD6679 datasheet(71/81 Pages) AD

71 / 81 page

Data Sheet

AD6679

Rev. B | Page 71 of 81

Reg.

Addr.

(Hex)

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(LSB)

Default

Notes

0x018

Buffer Control 1

(local)

0000 = 1.0× buffer current

0001 = 1.5× buffer current

0010 = 2.0× buffer current (default)

0011 = 2.5× buffer current

0100 = 3.0× buffer current

0101 = 3.5× buffer current

…

1111 = 8.5× buffer current

0x20

0x019

Buffer Control 2

(local)

0100 = Setting 1

0101 = Setting 2

0110 = Setting 3 (default)

0111 = Setting 4

(see Table 11 for setting per frequency range)

0x60

0x01A

Buffer Control 3 (local)

1000 = Setting 1

1001 = Setting 2

1010 = Setting 3 (default)

(see Table 11 for setting per frequency range)

0x0A

0x11A

Buffer Control 4 (local)

High

frequency

setting

0 = off

(default)

1 = on

0x00

0x935

Buffer Control 5 (local)

Low

frequency

operation

0 = off

1 = on

(default)

0x04

0x025

Input full-scale range

(local)

Full-scale adjust

0000 = 1.94 V p-p

1000 = 1.46 V p-p

1001 = 1.58 V p-p

1010 = 1.70 V p-p

1011 = 1.82 V p-p

1100 = 2.06 V p-p (default)

0x0C

Differ-

ential;

use in

con-

junction

with

Reg.

0x030

Input full-scale control

(local)

Full-scale control

See Table 11 for recommended

settings for different frequency bands;

default values:

Full scale range ≥ 1.82 V = 001

Full scale range < 1.82 V = 110

0x04

Used in

con-

junction

with

Reg.

0x025

ADC Function Registers

0x024

V_1P0 control

1.0 V

reference

select

0 =

internal

1 =

external

0x00

0x028

Temperature diode

(local)

Diode

selection

0 = no

diode

selected

1 =

temper-

ature

diode

selected

0x00

0x03F

PDWN/STBY pin

control (local)

0 =

PDWN/

STBY

enabled

1 =

disabled

0x00

Used in

con-

junction

with

Reg.

0x040

AD6679 Datasheet(PDF) 71 Page - Analog Devices

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