EVAL-ADF7021DBZ5 Datasheet, PDF (52/64 Pages) Analog Devices – High Performance Narrow-Band Transceiver IC

ADF7021
REGISTER 5—IF FILTER SETUP REGISTER
IR_GAIN_
ADJUST_MAG
IR_PHASE_
ADJUST_MAG
IF_FILTER_ADJUST
IF_FILTER_DIVIDER
Data Sheet
ADDRESS
BITS
PM3
0
0
0
.
1
PM2
0
0
0
.
1
IR PHASE
PM1 PM1 _ADJUST
00
0
01
1
10
2
.
.
...
11
15
PD1 IR PHASE ADJUST I/Q
0 ADJUST I CH
1 ADJUST Q CH
CC1 CAL
0 NO CAL
1 DO CAL
IFD9 .
0.
0.
.
.
.
.
.
.
.
.
1.
FILTER CLOCK
IFD6 IFD5 IFD4 IFD3 IFD2 IFD1 DIVIDE RATIO
0000011
0000102
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
1 1 1 1 1 1 511
IR GAIN
GM5 GM4 GM3 GM2 GM1 _ADJUST
0
0
0
00
0
0
0
0
01
1
0
0
0
10
2
.
.
.
.
.
...
1
1
1
11
31
GQ1 IR GAIN ADJUST I/Q
0 ADJUST I CH
1 ADJUST Q CH
GA1 IR GAIN ADJUST UP/DN
0 GAIN
1 ATTENUATE
IFA6 IFA5 _...
0 0 ...
0 0 ^...
0 0 ^...
.. .. ^...
0 1 ^...
1 0 ^...
1 0 ^...
1 0 ^...
1 . ^...
1 1 ^...
IF FILTER
IFA2 IFA1 ADJUST
00
0
01
+1
10
+2
.. ..
...
11
+31
00
0
01
–1
10
–2
..
...
11
–31
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
XTAL
= 50 kHz
IF _ FILTER _ DIVIDER
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.
Rev. B | Page 52 of 64