ADF7020BCPZ Analog Devices Inc, ADF7020BCPZ Datasheet - Page 19

• Manufacturer Part Number: ADF7020BCPZ
• Description: IC TX FSK/ASK ISM BAND 48LFCSP
• Manufacturer: Analog Devices Inc

Specifications of ADF7020BCPZ

• Design Resources: Low power, Long Range, ISM Wireless Measuring Node (CN0164)
• Frequency: 431MHz ~ 478MHz and 862MHz ~ 956MHz
• Data Rate - Maximum: 200kbps
• Modulation Or Protocol: ASK, FSK
• Applications: Data Transfer, RKE, Remote Control/Security Systems
• Power - Output: -16dBm ~ 13dBm
• Sensitivity: -119dBm
• Voltage - Supply: 2.3 V ~ 3.6 V
• Current - Receiving: 19mA
• Current - Transmitting: 26.8mA @ 10dBm
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LFCSP
• Data Rate: 200Kbps
• Supply Voltage Range: 2.3V To 3.6V
• Logic Case Style: LFCSP
• No. Of Pins: 48
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Termination Type: SMD
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 7mm
• Product Length (mm): 7mm
• Operating Supply Voltage (min): 2.3V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADF7020DBZ3 - BOARD EVAL ADF7020 433-445MHZEVAL-ADF7020DBZ2 - BOARD EVAL ADF7020 862-870MHZEVAL-ADF7020DBZ1 - BOARD EVAL ADF7020 902-928MHZ
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant

Gaussian Frequency Shift Keying (GFSK)
Gaussian frequency shift keying reduces the bandwidth occu-
pied by the transmitted spectrum by digitally prefiltering the
TxData. A TxCLK output line is provided from the ADF7020
for synchronization of TxData from the microcontroller.
The TxCLK line can be connected to the clock input of a shift
register that clocks data to the transmitter at the exact data rate.
Setting Up the ADF7020 for GFSK
To set up the frequency deviation, set the PFD and the modula-
tion control bits.
where m is GFSK_Mod_Control, set using R2_DB[24:26].
To set up the GFSK data rate,
The INDEX_COUNTER variable controls the number of inter-
mediate frequency steps between the low and high frequency.
It is usually possible to achieve a given data rate with various
combinations of DIVIDER_FACTOR and INDEX_COUNTER.
Choosing a higher INDEX_COUNTER can help in improving
the spectral performance.
GFSK
DR
[
bps
DEVIATION
]
=
DIVIDER
[
Hz
]
=
PFD
_
FACTOR
2
12
×
2
m
PFD
×
INDEX
_
COUNTER
Rev. B | Page 19 of 48
Amplitude Shift Keying (ASK)
Amplitude shift keying is implemented by switching the output
stage between two discrete power levels. This is accomplished
by toggling the DAC, which controls the output level between
two 6-bit values set up in Register 2. A 0 TxData bit sends
Bits R2_DB[15:20] to the DAC. A high TxData bit sends
Bits R2_DB[9:14] to the DAC. A maximum modulation depth
of 30 dB is possible.
On-Off Keying (OOK)
On-off keying is implemented by switching the output stage to a
certain power level for a high TxData bit and switching the
output stage off for a zero. For OOK, the transmitted power for
a high input is programmed using Bits R2_DB[9:14].
Gaussian On-Off Keying (GOOK)
Gaussian on-off keying represents a prefiltered form of OOK
modulation. The usually sharp symbol transitions are replaced
with smooth Gaussian filtered transitions, the result being a
reduction in frequency pulling of the VCO. Frequency pulling
of the VCO in OOK mode can lead to a wider than desired
BW, especially if it is not possible to increase the loop filter
BW > 300 kHz. The GOOK sampling clock samples data at the
data rate (see the Setting Up the ADF7020 for GFSK section).
ADF7020