ADF7021BCPZ-RL datasheet(52/64 Pages) AD

Part #	ADF7021BCPZ-RL

Description	High Performance Narrow-Band Transceiver IC

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52 / 64 page

ADF7021

Data Sheet

Rev. B | Page 52 of 64

REGISTER 5—IF FILTER SETUP REGISTER

IR_PHASE_

ADJUST_MAG

IR_GAIN_

ADJUST_MAG

IF_FILTER_DIVIDER

IF_FILTER_ADJUST

ADDRESS

BITS

CC1

0

1

CAL

NO CAL

DO CAL

PD1

0

1

IR PHASE ADJUST I/Q

ADJUST I CH

ADJUST Q CH

GA1

0

1

IR GAIN ADJUST UP/DN

GAIN

ATTENUATE

GQ1

0

1

IR GAIN ADJUST I/Q

ADJUST I CH

ADJUST Q CH

IFD3

0

.

1

IFD1

1

0

.

1

FILTER CLOCK

DIVIDE RATIO

1

2

.

511

IFD2

0

1

.

1

IFA2

0

1

..

1

0

1

.

1

IF FILTER

ADJUST

IFA6

0

..

0

1

GM3

IR GAIN

ADJUST

GM5

0

.

1

IFD9

0

.

1

IFD6

0

.

1

.

IFD5

0

.

1

IFD4

0

.

1

0

1

0

..

1

0

1

0

.

1

IFA1

...

0

+1

+2

...

+31

0

–1

–2

...

–31

GM4

GM2 GM1

0

.

1

0

.

1

0

1

.

1

0

1

0

.

1

0

1

2

...

31

PM2

IR PHASE

ADJUST

PM3

PM1 PM1

0

.

1

0

.

1

0

1

.

1

0

1

0

.

1

0

1

2

...

15

IFA5

0

..

1

0

.

1

Figure 67. Register 5—IF Filter Setup Register Map

A coarse IF filter calibration is performed when the

IF_CAL_COARSE bit (DB4) is set. If the IF_FINE_CAL bit

(R6_DB4) has been previously set, a fine IF filter calibration is

automatically performed after the coarse calibration.

Set IF_FILTER_DIVIDER such that

kHz

50

_

=

DIVIDER

FILTER

IF

XTAL

IF_FILTER_ADJUST allows the IF fine filter calibration result

to be programmed directly on subsequent receiver power-ups,

thereby saving on the need to redo a fine filter calibration in

some instances. Refer to the Filter Bandwidth Calibration

Readback section for information about using the

IF_FILTER_ADJUST bits.

DB[20:31] are used for image rejection calibration. Refer to the

Image Rejection Calibration section for details on how to

program these parameters.

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