EVAL-ADF7021-NDBZ5 Analog Devices Inc, EVAL-ADF7021-NDBZ5 Datasheet - Page 59

• 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 10—AFC REGISTER
•
•
•
The AFC_SCALING_FACTOR can be expressed as
The settings for KI and KP affect the AFC settling time and
AFC accuracy. The allowable range of each parameter is
KI > 6 and KP < 7.
The recommended settings to give optimal AFC
performance are KI = 11 and KP = 4. To trade off between
AFC settling time and AFC accuracy, the KI and KP
parameters can be adjusted from the recommended settings
(staying within the allowable range) such that
AFC Correction Range = MAX_AFC_RANGE × 500 Hz
AFC
MA8
0
0
0
0
.
.
.
1
1
1
_
MAX_AFC_RANGE
SCALING
...
...
...
...
...
...
...
...
...
...
...
MA3
0
0
0
1
.
.
.
1
1
1
_
MA2
0
1
1
0
.
.
.
0
1
1
FACTOR
KP3
0
0
.
1
MA1
1
0
1
0
.
.
.
1
0
1
KP2
0
0
.
1
MAX_AFC_
RANGE
1
2
3
4
.
.
.
253
254
255
=
KP1
0
1
.
1
Round
KP
KP
2^0
2^1
...
2^7
⎛
⎜ ⎜
⎝
2
24
XTAL
×
KI4
0
0
.
1
Figure 73. Register 10—AFC Register Map
500
KI
KI3
0
0
.
1
⎞
⎟ ⎟
⎠
Rev. 0 | Page 59 of 64
KI2
0
0
.
1
KI1
0
1
.
1
KI
2^0
2^1
...
2^15
•
•
M12
0
0
0
0
.
.
.
1
1
1
AFC_SCALING_FACTOR
When the RF_DIVIDE_BY_2 (R1_DB18) is enabled, the
programmed AFC correction range is halved. The user
accounts for this halving by doubling the programmed
MAX_AFC_RANGE value.
Signals that are within the AFC pull-in range but outside
the IF filter bandwidth are attenuated by the IF filter. As a
result, the signal can be below the sensitivity point of the
receiver and, therefore, not detectable by the AFC.
...
...
...
...
...
...
...
...
...
...
...
M3
0
0
0
1
.
.
.
1
1
1
M2
0
1
1
0
.
.
.
0
1
1
M1
1
0
1
0
.
.
.
1
0
1
AFC_SCALING_
FACTOR
1
2
3
4
.
.
.
4093
4094
4095
AE1
0
1
AFC_EN
OFF
AFC ON
ADDRESS
BITS
ADF7021-N