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ADF7021-V
REGISTER 5—IF FILTER SETUP REGISTER
IR_GAIN_
ADJUST_MAG
GM5
GM4
GM3
0
0
0
0
0
0
0
0
0
.
.
.
1
1
1
GQ1
IR_GAIN_ADJUST_I/Q
0
ADJUST I CH
1
ADJUST Q CH
GA1
IR_GAIN_ADJUST_UP/DN
0
GAIN
1
ATTENUATE
•
A coarse IF filter calibration is performed when the
IF_CAL_COARSE bit (Bit DB4) is set. If the IF_FINE_
CAL bit (Register 6, Bit DB4) has been previously set, a
fine IF filter calibration is automatically performed after
the coarse calibration.
•
Set IF_FILTER_DIVIDER such that
XTAL
IF
_
FILTER
_
DIVIDER
IR_PHASE_
ADJUST_MAG
PM4
PM3
PM2 PM1
0
0
0
0
0
0
0
1
0
0
1
0
.
.
.
.
1
1
1
1
PD1
IR_PHASE_ADJUST_DIRECTION
0
ADJUST I CH
1
ADJUST Q CH
IR_GAIN_
GM2 GM1
ADJUST_MAG
0
0
0
IFA6
0
1
1
1
0
2
0
.
.
...
0
31
1
1
0
..
0
1
1
1
1
1
Figure 67. Register 5—IF Filter Setup Register Map
=
50
kHz
IF_FILTER_ADJUST
IF_FILTER_DIVIDER
IR_PHASE_
ADJUST_MAG
0
IFD9
.
1
2
0
.
...
0
.
15
.
.
.
.
.
.
.
.
1
.
IFA5
IFA2
IFA1 IF_FILTER_ADJUST
...
...
0
0
0
0
...
0
+1
0
1
...
0
1
0
+2
...
..
...
..
..
...
1
1
1
+31
...
0
0
0
0
...
0
0
1
–1
...
0
–2
1
0
...
.
.
.
...
...
1
–31
1
1
•
IF_FILTER_ADJUST allows the IF fine filter calibration
result to be programmed directly on subsequent receiver
power-ups, thereby eliminating the need to redo a fine filter
calibration in some instances. See the Filter Bandwidth
Calibration Readback section for information about using
the IF_FILTER_ADJUST bits.
•
Bits[DB31:DB20] are used for image rejection calibration.
See the Image Rejection Calibration section for information
about how to program these parameters.
Rev. 0 | Page 50 of 60
CC1 IF_CAL_COARSE
0
DISABLED
1
ENABLED
IFD6
IFD5
IFD4
IFD3
IFD2
IFD1
0
0
0
0
0
1
0
0
0
0
1
0
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
1
1
1
1
1
1
ADDRESS
BITS
IF_FILTER_
DIVIDER
1
2
.
.
.
.
511
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