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ADF7021 Datasheet(PDF) 32 Page - Analog Devices

Part # ADF7021
Description  High Performance Narrowband ISM Transceiver IC
PDF  44 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADF7021 Datasheet(HTML) 32 Page - Analog Devices

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ADF7021
Preliminary Technical Data
Rev. PrI | Page 32 of 44
REGISTER 4—DEMODULATOR SETUP REGISTER
DISCRIMINATOR BW
POST DEMODULATOR BW
DEMOD
SCHEME
Rx
INVERT
IF B/W
ADDRESS
BITS
DS1
0
1
0
1
0
1
0
1
DEMODULATOR SCHEME
2FSK LINEAR DEMODULATOR
2FSK CORRELATOR/DEMODULATOR
3FSK DEMODULATOR
4FSK DEMODULATOR
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
B/W
12kHz
18kHz
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
Figure 36.
Register 4—Demodulator Setup Register Comments
•
Discriminator_BW =
3
10
400
_
×
× K
CLK
DEMOD
where:
[Hz]
10
100
3
Deviation
Frequency
K
×
=
Maximum value = 660.
•
RX_INVERT(R4_DB[8:9]) and DOT_PRODUCT (R4_DB7) need to be set as outlined below in order to optimize the correlator
demodulator. K is calculated using the previous formula and then rounded to the nearest integer.
K
K/2
Dot Product (R4_DB7)
Rx Invert (R4_DB[8:9])
Even
Even
0
00
Even
Odd
0
10
K
(K + 1)/2
Dot Product (R4_DB7)
Rx Invert (R4_DB[8:9])
Odd
Even
1
00
Odd
Odd
1
10
•
CLK
DEMOD
F
_BW
Post_Demod
CUTOFF
_
π
2
11
×
×
=
where the cutoff frequency (FCUTOFF) of the postdemodulator filter should typically be 0.75 times the data rate.



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