EVAL-ADF7021-VDB2Z Analog Devices Inc, EVAL-ADF7021-VDB2Z Datasheet - Page 49

• 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 4—DEMODULATOR SETUP REGISTER
•
DW10
0
0
.
.
.
.
1
IFB2
0
0
1
1
To solve for DISCRIMINATOR_BW, (Bits[DB19:DB10]),
use the following equation:
where the maximum value = 660.
For 2FSK,
For 3FSK,
For 4FSK,
DISCRIMINA
K
K
K
.
.
.
.
.
.
.
.
IFB1
0
1
0
1
=
=
=
Round
Round
Round
DW6
0
0
.
.
.
.
1
IF_FILTER _
BW
9kHz
13.5kHz
18.5kHz
INVALID
DW5
0
0
.
.
.
.
1
4
⎛
⎜
⎜
⎝
⎛
⎜
⎜
⎝
FSK
100
100
TOR
DW4
0
0
.
.
.
.
1
2
⎛
⎜
⎜
⎝
×
f
100
×
×
DEV
f
4
DW3
0
0
.
.
.
.
1
_
10
DEV
10
BW
×
POST_DEMOD_BW
×
3
3
f
DW2
0
1
.
.
.
.
1
10
DEV
TD10
0
0
.
.
.
.
1
=
⎞
⎟
⎟
⎠
⎞
⎟
⎟
⎠
3
⎛
⎜
⎜
⎝
DW1
1
0
.
.
.
.
1
DEMOD
.
.
.
.
.
.
.
.
⎞
⎟
⎟
⎠
POST_DEMOD_BW
1
2
.
.
.
.
1023
400
TD6
0
0
.
.
.
.
0
×
CLK
TD5
0
0
.
.
.
.
1
10
Figure 66. Register 4—Demodulator Setup Register Map
3
TD4
0
0
.
.
.
.
0
×
K
⎞
⎟
⎟
⎠
TD3
0
0
.
.
.
.
1
TD2
0
1
.
.
.
.
0
Rev. 0 | Page 49 of 60
TD1
1
0
.
.
.
.
0
DISCRIMINATOR_BW
RI2
0
0
1
1
DISCRIMINATOR_BW
1
2
.
.
.
.
660
RI1
0
1
0
1
•
•
Rx_INVERT
NORMAL
INVERT CLK
INVERT DATA
INVERT CLK/DATA
where:
Round is rounded to the nearest integer.
Round
32, 31, 28, 27, 24, 23, 20, 19, 16, 15, 12, 11, 8, 7, 4, 3.
f
f
(that is, the inner frequency deviations).
Rx_INVERT (Bits[DB9:DB8]) and DOT_PRODUCT
(Bit DB7) must be set as indicated in Table 16 and Table 17.
POST_DEMOD_BW (Bits[DB29:DB20]) sets the
bandwidth of the postdemodulator filter. To solve for
POST_DEMOD_BW, use the following equation:
where f
filter) should typically be set equal to 0.75 × the data rate in
2FSK. In 3FSK, it should be set equal to the data rate, whereas
in 4FSK, it should be set equal to 1.6 × the symbol rate.
POST_DEMOD
DEV
DEV
is the transmit frequency deviation in Hz. For 4FSK,
is the frequency deviation used for the ±1 symbols
4FSK
CUTOFF
is rounded to the nearest of the following integers:
DP1
0
1
(the cutoff frequency of the postdemodulator
INVERT
DS3
0
0
0
0
1
1
1
1
Rx_
DOT_PRODUCT
CROSS_PRODUCT
DOT_PRODUCT
_BW
DS2
0
0
1
1
0
0
1
1
DS1
0
1
0
1
0
1
0
1
=
2
DEMOD
11
DEMOD_
SCHEME
DEMOD_SCHEME
2FSK LINEAR DEMODULATOR
2FSK CORRELATOR DEMODULATOR
3FSK DEMODULATOR
4FSK DEMODULATOR
RESERVED
RESERVED
RESERVED
RESERVED
×
π
×
f
CUTOFF
CLK
ADDRESS
ADF7021-V
BITS