EVAL-ADF7021-NDBZ5 Analog Devices Inc, EVAL-ADF7021-NDBZ5 Datasheet - Page 55

• Manufacturer Part Number: EVAL-ADF7021-NDBZ5
• Description: Matching Unpopulated
• Manufacturer: Analog Devices Inc
• Type: Transceiver, FSKr

Specifications of EVAL-ADF7021-NDBZ5

• Frequency: 80MHz ~ 650MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ADF7021-N
• Lead Free Status / Rohs Status: Supplier Unconfirmed

REGISTER 6—IF FINE CAL SETUP REGISTER
•
IRD1
0
1
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.
It is recommended to place the lower tone and upper tone
as outlined in Table 24.
Table 24. IF Filter Fine Calibration Tone Frequencies
IF Filter
Bandwidth
9 kHz
13.5 kHz
18.5 kHz
IR_CAL_SOURCE ÷2
SOURCE ÷2 OFF
SOURCE ÷2 ON
Lower Tone Frequency (kHz) =
Upper Tone Frequency (kHz) =
IF_CAL_LOW
IF_CAL_UPP
IRC2
0
0
1
1
IRC1
0
1
0
1
IR_CAL_SOURCE_
DRIVE_LEVEL
OFF
LOW
MED
HIGH
ER_TONE_DI
ER_TONE_DI
Lower Tone
Frequency
78.1 kHz
79.4 kHz
78.1 kHz
XTAL
XTAL
1
CD7
0
0
0
.
.
IF_CAL_DWELL_TIME
...
...
...
...
...
...
...
VIDE
VIDE
1
CD3
0
0
0
.
.
1
CD2
0
1
1
.
.
×
×
2
2
Upper Tone
Frequency
116.3 kHz
116.3 kHz
119 kHz
1
CD1
1
0
1
.
.
Figure 69. Register 6—IF Fine Cal Setup Register Map
0
UT8
0
0
0
.
.
IF_CAL_
DWELL_TIME
1
2
3
.
.
127
UT7
1
0
0
0
.
.
IF_CAL_UPPER_TONE_DIVIDE
...
...
...
...
...
...
...
Rev. 0 | Page 55 of 64
1
UT3
0
0
0
.
.
1
UT2
0
1
1
.
.
1
UT1
1
0
1
.
.
•
•
IF_CAL_UPPER_
TONE_DIVIDE
1
2
3
.
.
127
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.
The total time for a fine IF filter calibration is
R6_DB[28:30] control the internal source for the image
rejection (IR) calibration. The IR_CAL_SOURCE_
DRIVE_LEVEL bits (R6_DB[28:29]) set the drive strength
of the source, whereas the IR_CAL_SOURCE_÷2 bit
(R6_DB30) allows the frequency of the internal signal
source to be divided by 2.
IF Tone Calibration Time =
IF Tone Calibration Time × 10
LT8
1
0
0
0
.
.
IF_CAL_LOWER_TONE_DIVIDE
1
LT7
0
0
0
.
.
...
...
...
...
...
...
...
1
LT3
0
0
0
.
.
1
LT2
0
1
1
.
.
1
LT1
1
0
1
.
.
1
2
.
.
255
IF
IF_CAL_LOWER_
TONE_DIVIDE
3
FC1
0
1
_
CAL
IF_FINE_CAL
DISABLED
ENABLED
SEQ
_
DWELL
ADF7021-N
CLK
ADDRESS
BITS
_
TIME