EVAL-ADF7021-VDB2Z Analog Devices Inc, EVAL-ADF7021-VDB2Z Datasheet - Page 47

• 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 2—TRANSMIT MODULATION REGISTER
•
•
The 2FSK/3FSK/4FSK frequency deviation is expressed as
follows:
For direct RF output,
Frequency Deviation (Hz) =
With RF_DIVIDE_BY_2 (Register 1, Bit DB18) enabled,
Frequency Deviation (Hz) =
where:
Tx_FREQUENCY_DEVIATION is set by Bits[DB27:DB19].
PFD is the PFD frequency.
In the case of 4FSK, there are tones at ±3 × the frequency
deviation and at ±1 × the frequency deviation.
0
Tx_FREQUEN
5 .
NRC1
0
1
×
Tx_FREQUEN
DI2
0
0
1
1
TxDATA_
R-COSINE_ALPHA
0.5 (DEFAULT)
0.7
INVERT
DI1
0
1
0
1
CY_DEVIATI
TxDATA_INVERT
NORMAL
INVERT CLK
INVERT DATA
INV CLK AND DATA
TFD9
0
0
0
0
.
1
2
Tx_FREQUENCY_DEVIATION
CY_DEVIATI
16
...
...
...
...
...
...
...
2
16
TFD3
0
0
0
0
.
1
ON
TFD2
0
0
1
1
.
1
×
ON
P6
0
0
0
0
.
.
1
TFD1
PFD
0
1
0
1
.
1
×
Figure 64. Register 2—Transmit Modulation Register Map
P5
0
0
0
0
.
.
1
PFD
f
0
1
2
3
.
511
DEV
...
...
...
...
...
...
...
...
P2
0
0
1
1
.
.
1
POWER_AMPLIFIER
P1
0
1
0
1
.
.
1
Rev. 0 | Page 47 of 60
POWER_
AMPLIFIER
0 (PA OFF)
1 (–16.0dBm)
2
3
.
.
63 (+13dBm)
PA2
0
0
1
1
PR3
0
0
0
0
1
1
1
1
PA1
0
1
0
1
PR2
0
0
1
1
0
0
1
1
•
•
PA_BIAS
5µA
7µA
9µA
11µA
PR1
0
1
0
1
0
1
0
1
PA_BIAS
The power amplifier (PA) ramps at the programmed rate
(Bits[DB10:DB8]) until it reaches its programmed level
(Bits[DB18:DB13]). If the PA is enabled/disabled by the
PA_ENABLE bit (Bit DB7), it ramps up and down. If it is
enabled/disabled by the Tx/Rx bit (Register 0, Bit DB27),
it ramps up and turns hard off.
R-COSINE_ALPHA sets the roll-off factor (alpha) of the
raised cosine data filter to either 0.5 or 0.7. The alpha is set
to 0.5 by default, but the raised cosine filter bandwidth can
be increased to provide less aggressive data filtering by
using an alpha of 0.7.
NO RAMP
256 CODES/BIT
128 CODES/BIT
64 CODES/BIT
32 CODES/BIT
16 CODES/BIT
8 CODES/BIT
4 CODES/BIT
PA_RAMP RATE
PE1
0
1
PA_RAMP
S3
0
0
0
0
1
1
1
1
PA_ENABLE
OFF
ON
S2
0
0
1
1
0
0
1
1
S1
0
1
0
1
0
1
0
1
MODULATION_
MODULATION_SCHEME
2FSK
GAUSSIAN 2FSK
3FSK
4FSK
OVERSAMPLED 2FSK
RAISED COSINE 2FSK
RAISED COSINE 3FSK
RAISED COSINE 4FSK
SCHEME
ADDRESS
BITS
ADF7021-V