AD9670EBZ datasheet(45/53 Pages) AD

45 / 53 page

AD9670

Data Sheet

Rev. A | Page 44 of 52

Addr.

(Hex)

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

Default

Value

Comments

0x00D

TEST_IO

User test

mode

0 = con-

tinuous,

repeat user

patterns

(1, 2, 3, 4,

1, 2, 3, 4 …)

(default)

1 = single

clock cycle

user pat-

terns, then

zeros (1, 2,

3, 4, 0, 0 …)

Reset PN

long gen-

eration

0 = on,

PN long

running

(default)

1 = off,

PN long

held in

reset

Reset PN

short gen-

eration

0 = on,

PN short

running

(default)

1 = off,

PN short

held in

reset

Output test mode

0000 = off (default)

0001 = midscale short

0010 = +FS short

0011 = −FS short

0100 = checkerboard output

0101 = PN sequence long

0110 = PN sequence short

0111 = one-/zero-word toggle

1000 = user input

1001:1110 = reserved

1111 = ramp output

0x00

When this register

is set, the test data

is placed on the

output pins in

place of normal

data (local).

0x00E

GPO

General-purpose digital outputs

0x00

Values placed on

the GPO0 to

GPO3 pins (global).

0x00F

FLEX_CHANNEL_

INPUT

Filter cutoff frequency control

0 0000 = 1.45 × (1/3) × fSAMPLE

0 0001 = 1.25 × (1/3) × fSAMPLE

0 0010 = 1.13 × (1/3) × fSAMPLE

0 0011 = 1.0 × (1/3) × fSAMPLE (default)

0 0100 = 0.9 × (1/3) × fSAMPLE

0 0101 = 0.8 × (1/3) × fSAMPLE

0 0110 = 0.75 × (1/3) × fSAMPLE

0 0111 = reserved

0 1000 = 1.45 × (1/4.5) × fSAMPLE

0 1001 = 1.25 × (1/4.5) × fSAMPLE

0 1010 = 1.13 × (1/4.5) × fSAMPLE

0 1011 = 1.0 × (1/4.5) × fSAMPLE

0 1100 = 0.9 × (1/4.5) × fSAMPLE

0 1101 = 0.8 × (1/4.5) × fSAMPLE

0 1110 = 0.75 × (1/4.5) × fSAMPLE

0 1111 = reserved

1 0000 = 1.45 × (1/6) × fSAMPLE

1 0001 = 1.25 × (1/6) × fSAMPLE

1 0010 = 1.13 × (1/6) × fSAMPLE

1 0011 = 1.0 × (1/6) × fSAMPLE

1 0100 = 0.9 × (1/6) × fSAMPLE

1 0101 = 0.8 × (1/6) × fSAMPLE

1 0110 = 0.75 × (1/6) × fSAMPLE

1 0111 = reserved

BW mode

0 = low

(default,

8 MHz to

18 MHz)

1 = high

(13.5 MHz

to 30 MHz)

0x18

Antialiasing filter

cutoff (global).

0x010

FLEX_OFFSET

0x20

Reserved.

0x011

FLEX_GAIN

Digital VGA gain control

0000 = GAIN± pins enabled (default)

0001 = 0.0 dB (maximum gain, GAIN± pins disabled)

0010 = −3.5 dB

0011 = −7.0 dB

…

1110 = −45.5 dB

1111 = −45.5 dB

PGA gain

00 = 21 dB

01 = 24 dB (default)

10 = 27 dB

11 = 30 dB

LNA gain

00 = 15.6 dB

01 = 17.9 dB

10 = 21.6 dB

(default)

0x06

LNA and PGA gain

adjustment (global).

0x012

BIAS_CURRENT

PGA bias

0 =100%

(default)

1 = 60%

LNA bias

00 = high

01 = midhigh (default)

10 = midlow

11 = low

0x09

LNA bias current

adjustment (global).

0x013

RESERVED_13

0x00

Reserved.

0x014

OUTPUT_MODE

Output

data

enable

0 = enable

(default)

1 =

disable

Output

data invert

0 = disable

(default)

1 = enable

Output data format

00 = offset binary

01 = twos complement

(default)

10 = gray code

11 = reserved

0x01

Data output

modes (local).

AD9670EBZ Datasheet(PDF) 45 Page - Analog Devices

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