AD9670EBZ datasheet(47/53 Pages) AD

47 / 53 page

AD9670

Data Sheet

Rev. A | Page 46 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

0x02B

FLEX_FILTER

Enable

automatic

low-pass

tuning

1 = on

(self

clearing)

Bypass

analog

HPF

0 = off

(default)

1 = on

Analog high-pass filter

cutoff

00 = fLP/12.00 (default)

01 = fLP/9.00

10 = fLP/6.00

11 = fLP/3.00

0x00

Filter cutoff

(global); (fLP = low-

pass filter cutoff

frequency).

0x02C

LNA_TERM

LO-x, LOSW-x

connection

00 = RFB1 (default)

01 = (RFB1 || RFB2)

10 = RFB2

11 = ∞

0x00

LNA active

termination/input

impedance (global).

0x02D

CW_ENABLE_

PHASE

Doppler

channel

enable

0 = off

(default)

0 = on

I/Q demodulator phase

0000 = 0° (default)

0001 = 22.5° (not valid for 4LO mode)

0010 = 45°

0011 = 67.5° (not valid for 4LO mode)

0100 = 90°

0101 = 112.5° (not valid for 4LO mode)

0110 = 135°

0111 = 157.5° (not valid for 4LO mode)

1000 = 180°

1001 = 202.5° (not valid for 4LO mode)

1010 = 225°

1011 = 247.5° (not valid for 4LO mode)

1100 = 270°

1101 = 292.5° (not valid for 4LO mode)

1110 = 315°

1111 = 337.5° (not valid for 4LO mode)

0x00

Phase of

demodulators

(local, chip).

0x02E

CW_LO_MODE

Partially

enables

LVDS

during CW

0: LVDS

link dis-

abled

during CW

(default)

1: LVDS

link part-

ially

enabled

during

CW. PLL,

FCO, and

DCO are

enabled,

while LVDS

data drivers

are dis-

abled

(switching

activity can

degrade

CW per-

formance)

RESET

with MLO

clock

edge

0 = syn-

chronous

(default)

1 = asyn-

chronous

Synchro-

nous RESET

sampling

MLO±

clock edge

0 = falling

(default)

1 = rising

RESET

signal

polarity

0 = active

high

(default)

1 = active

low

MLO and

RESET

buffer

enable (in

all modes

except CW

mode)

0 = power-

down

(default)

1 = enable

LO mode

00X = 4LO, 3rd to 5th odd harmonic

rejection (default)

010 = 8LO, 3rd to 5th odd harmonic

rejection

011 = 8LO, 3rd to 13th odd harmonic

rejection

100 = 16LO, 3rd to 5th odd harmonic

rejection

101 = 16LO, 3rd to 13th odd harmonic

rejection

11X = reserved

0x00

CW mode

functions (global).

0x02F

CW_OUTPUT

CW output

dc bias

voltage

0 = bypass

1 = enable

(default)

0x80

Global.

0x102

RESERVED_102

0X00

Reserved.

0x103

RESERVED_103

0X00

Reserved.

0x104

RESERVED_104

0x3F

Reserved.

0x105

RESERVED_105

0x00

Reserved.

0x106

RESERVED_106

0x00

Reserved.

0x107

RESERVED_107

Read

only

Reserved.

0x108

RESERVED_108

0x00

Reserved.

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