EVAL-ADF7021-VDB2Z Analog Devices Inc, EVAL-ADF7021-VDB2Z Datasheet - Page 55

• 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 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 for each parameter is
KI > 6 and KP < 7.
The recommended settings for 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
SCALING
MAX_AFC_RANGE
...
...
...
...
...
...
...
...
...
...
...
MA3
0
0
0
1
.
.
.
1
1
1
_
FACTOR
MA2
0
1
1
0
.
.
.
0
1
1
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
Round
KP1
0
1
.
1
KP
KP
2^0
2^1
...
2^7
⎛
⎜ ⎜
⎝
2
24
XTAL
×
500
KI4
0
0
.
1
Figure 72. Register 10—AFC Register Map
⎞
⎟ ⎟
⎠
KI
KI3
0
0
.
1
Rev. 0 | Page 55 of 60
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 RF_DIVIDE_BY_2 (Register 1, Bit DB18) is enabled,
the programmed AFC correction range is halved. The user
must account 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
AFC OFF
AFC ON
ADDRESS
BITS
ADF7021-V