EVAL-ADF7021-VDB2Z Analog Devices Inc, EVAL-ADF7021-VDB2Z Datasheet - Page 51

• Manufacturer Part Number: EVAL-ADF7021-VDB2Z
• Description: 868 - 870MHz - EVALUATION BOARD
• Manufacturer: Analog Devices Inc
• Type: Transceiverr

Specifications of EVAL-ADF7021-VDB2Z

• Frequency: 868MHz ~ 870MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ADF7021
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REGISTER 6—IF FINE CALIBRATION SETUP REGISTER
•
•
Table 24. IF Filter Fine Calibration Tone Frequencies
IF Filter
Bandwidth (kHz)
9
13.5
18.5
IRD1
0
1
A fine IF filter calibration is set by enabling the IF_FINE_
CAL bit (Bit DB4). A fine calibration is performed only
when Register 5 is written to and Register 5, Bit DB4 is set.
Lower Tone Frequency (kHz) =
Upper Tone Frequency (kHz) =
It is recommended that the lower tone and the upper tone
be set as shown in Table 24.
IF_CAL_LOW
IF_CAL_UPP
IR_CAL_SOURCE ÷2
SOURCE ÷2 OFF
SOURCE ÷2 ON
IRC2
0
0
1
1
IRC1
0
1
0
1
ER_TONE_DI
IR_CAL_SOURCE_
DRIVE_LEVEL
ER_TONE_DI
OFF
LOW
MED
HIGH
XTAL
XTAL
Lower Tone
Frequency (kHz)
78.1
79.4
78.1
1
CD7
0
0
0
.
.
IF_CAL_DWELL_TIME
...
...
...
...
...
...
...
VIDE
VIDE
1
CD3
0
0
0
.
.
×
×
1
CD2
0
1
1
.
.
2
2
Figure 68. Register 6—IF Fine Calibration Setup Register Map
Upper Tone
Frequency (kHz)
116.3
116.3
119
1
CD1
1
0
1
.
.
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 51 of 60
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. It is recommended that the IF tone
calibration time be at least 800 μs.
The total time for a fine IF filter calibration is
IF Tone Calibration Time × 10
Bits[DB30:DB28] control the internal source for the image
rejection (IR) calibration. The IR_CAL_SOURCE_DRIVE_
LEVEL bits (Bits[DB29:DB28]) set the drive strength of the
source, whereas the IR_CAL_SOURCE ÷2 bit (Bit DB30)
allows the frequency of the internal signal source to be
divided by 2.
IF
Tone
LT8
1
0
0
0
.
.
IF_CAL_LOWER_TONE_DIVIDE
Calibratio
1
LT7
0
0
0
.
.
...
...
...
...
...
...
...
1
LT3
0
0
0
.
.
n
1
LT2
0
1
1
.
.
Time
1
LT1
1
0
1
.
.
=
IF_CAL_DWE
1
2
.
.
255
IF_CAL_LOWER_
TONE_DIVIDE
3
FC1
0
1
SEQ
IF_FINE_CAL
DISABLED
ENABLED
ADF7021-V
CLK
ADDRESS
LL_TIME
BITS