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ADF7021 Datasheet(PDF) 51 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) 51 Page - Analog Devices

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Data Sheet
ADF7021
Rev. B | Page 51 of 64
REGISTER 4—DEMODULATOR SETUP REGISTER
DISCRIMINATOR_BW
POST_DEMOD_BW
Rx_
INVERT
IF_BW
ADDRESS
BITS
DS1
0
1
0
1
0
1
0
1
DEMODULATOR SCHEME
2FSK LINEAR DEMODULATOR
2FSK CORRELATOR DEMODULATOR
3FSK DEMOD
4FSK DEMOD
RESERVED
RESERVED
RESERVED
RESERVED
DP1
0
1
PRODUCT
CROSS PRODUCT
DOT PRODUCT
RI1
0
1
0
1
INVERT
NORMAL
INVERT CLK
INVERT DATA
INVERT CLK/DATA
IFB1
0
1
0
1
IF FILTER
BW
12.5kHz
18.75kHz
25kHz
INVALID
DS2
DS3
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
RI2
IFB2
0
0
1
1
DW3
0
0
.
.
.
.
1
DW1
1
0
.
.
.
.
1
POST DEMOD
BW
1
2
.
.
.
.
1023
DW2
0
1
.
.
.
.
1
DW10
0
0
.
.
.
.
1
DW6
0
0
.
.
.
.
1
.
.
.
.
.
.
.
.
DW5
0
0
.
.
.
.
1
DW4
0
0
.
.
.
.
1
TD3
0
0
.
.
.
.
1
TD1
1
0
.
.
.
.
0
CORRELATOR
DISCRIM BW
1
2
.
.
.
.
660
TD2
0
1
.
.
.
.
0
TD10
0
0
.
.
.
.
1
TD6
0
0
.
.
.
.
0
.
.
.
.
.
.
.
.
TD5
0
0
.
.
.
.
1
TD4
0
0
.
.
.
.
0
DEMOD_
SCHEME
Figure 66. Register 4—Demodulator Setup Register Map
To solve for DISCRIMINATOR_BW, use the following
equation:
DISCRIMINATOR_BW =
3
10
400×
× K
CLK
DEMOD
where the maximum value = 660.
For 2FSK,


×
=
DEV
f
Round
K
3
10
100
For 3FSK,


×
×
=
DEV
f
Round
K
2
10
100
3
For 4FSK,


×
×
=
DEV
FSK
f
Round
K
4
10
100
3
4
where:
Round is rounded to the nearest integer.
Round4FSK is rounded to the nearest of the following integers: 32,
31, 28, 27, 24, 23, 20, 19, 16, 15, 12, 11, 8, 7, 4, 3.
fDEV is the transmit frequency deviation in Hz. For 4FSK, fDEVis
the frequency deviation used for the ±1 symbols (that is, the
inner frequency deviations).
Rx_INVERT (DB[8:9]) and DOT_PRODUCT (DB7) need to be
set as outlined in Table 17 and Table 18.
CLK
DEMOD
f
_BW
POST_DEMOD
CUTOFF
×
×
=
π
211
where the cutoff frequency (fCUTOFF) of the post demodulator
filter should typically be 0.75 × the data rate in 2FSK. In 3FSK,
it should be set equal to the data rate, while in 4FSK, it should
be set equal to 1.6 × symbol rate.



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