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ADF7021 Datasheet(PDF) 53 Page - Analog Devices

Part # ADF7021
Description  High Performance Narrow-Band Transceiver IC
PDF  64 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADF7021 Datasheet(HTML) 53 Page - Analog Devices

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Data Sheet
ADF7021
Rev. B | Page 53 of 64
REGISTER 6—IF FINE CAL SETUP REGISTER
IF_CAL_LOWER_TONE_DIVIDE
IF_CAL_UPPER_TONE_DIVIDE
IF_CAL_DWELL_TIME
ADDRESS
BITS
FC1
0
1
IF FINE CAL
DISABLED
ENABLED
UT3
0
0
0
.
.
1
UT1
1
0
1
.
.
1
IF CAL UPPER
TONE DIVIDE
1
2
3
.
.
UT2
0
1
1
.
.
1
UT8
0
0
0
.
.
0
...
...
...
...
...
...
...
127
LT3
0
0
0
.
.
1
LT1
1
0
1
.
.
1
1
2
3
.
.
LT2
0
1
1
.
.
1
LT8
0
0
0
.
.
1
...
...
...
...
...
...
...
255
IF CAL LOWER
TONE DIVIDE
CD3
0
0
0
.
.
1
CD1
1
0
1
.
.
1
IF CAL
DWELL TIME
1
2
3
.
.
CD2
0
1
1
.
.
1
CD7
0
0
0
.
.
1
...
...
...
...
...
...
...
127
IRC1
0
1
0
1
IR CAL SOURCE
DRIVE LEVEL
IRC2
0
0
1
1
OFF
LOW
MED
HIGH
IRD1
0
1
IR CAL SOURCE ÷2
SOURCE ÷2 OFF
SOURCE ÷2 ON
0
0
0
.
.
1
LT7
0
0
0
.
.
1
UT7
Figure 68. Register 6—IF Fine Cal Setup Register Map
A fine IF filter calibration is set by enabling the IF_FINE_CAL
Bit (R6_DB4). A fine calibration is then carried out only when
Register 5 is written to and R5_DB4 is set.
Set the IF upper and lower tones used during fine filter
calibration as follows:
kHz
8
.
65
2
_
_
_
_
=
×
DIVIDE
TONE
LOWER
CAL
IF
XTAL
kHz
5
.
131
2
_
_
_
_
=
×
DIVIDE
TONE
UPPER
CAL
IF
XTAL
The IF tone calibration time is the amount of time that is spent
at an IF calibration tone. It is dependent on the sequencer clock.
For best practice, is recommended to have the IF tone
calibration time be at least 500 µs.
CLK
SEQ
TIME
DWELL
CAL
IF
Time
n
Calibratio
Tone
IF
_
_
_
=
The total time for a fine IF filter calibration is
IF Tone Calibration Time × 10.
DB[28:30] control the internal source for the image rejection
(IR) calibration. The IR_CAL_SOURCE_DRIVE_LEVEL bits
(DB[28:29]) set the drive strength of the source, whereas the
IR_CAL_SOURCE_÷2 bit (DB30) allows the frequency of the
internal signal source to be divided by 2.



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