ADF7020-1BCPZ-RL7 Analog Devices Inc, ADF7020-1BCPZ-RL7 Datasheet - Page 18

• Manufacturer Part Number: ADF7020-1BCPZ-RL7
• Description: IC,RF Modulator/Demodulator,LLCC,48PIN,PLASTIC
• Manufacturer: Analog Devices Inc

Specifications of ADF7020-1BCPZ-RL7

• 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: 17.6mA
• Current - Transmitting: 21mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LFCSP
• 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-ADF7020-1DBZ8 - BOARD EVAL ADF7020-1 128-142MHZEVAL-ADF7020-1DBZ7 - BOARD EVAL ADF7020-1 310-340MHZEVAL-ADF7020-1DBZ6 - BOARD EVAL ADF7020-1 470-510MHZEVAL-ADF7020-1DBZ4 - BOARD EVAL ADF7020-1 405-435MHZEVAL-ADF7020-1DBZ5 - BOARD EVAL ADF7020-2 ADJ FREQ
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant

ADF7020-1
TRANSMITTER
RF OUTPUT STAGE
The PA of the ADF7020-1 is based on a single-ended,
controlled current, open-drain amplifier that has been designed
to deliver up to 13 dBm into a 50 Ω load at a maximum
frequency of 650 MHz.
The PA output current and, consequently, the output power are
programmable over a wide range. The PA configurations in
FSK/GFSK and ASK/OOK modulation modes are shown in
Figure 26 and Figure 27, respectively. In FSK/GFSK modulation
mode, the output power is independent of the state of the
DATA_IO pin. In ASK/OOK modulation mode, it is dependent
on the state of the DATA_IO pin and Bit R2_DB29, which
selects the polarity of the TxData input. For each transmission
mode, the output power can be adjusted as follows:
•
•
•
DATA I/O
RFGND
RFOUT
RFGND
RFOUT
FSK/GFSK: The output power is set using bits
R2_DB (9:14).
ASK: The output power for the inactive state of the TxData
input is set by Bits R2_DB (15:20). The output power for the
active state of the TxData input is set by Bits R2_DB (9:14).
OOK: The output power for the active state of the TxData
input is set by Bits R2_DB (9:14). The PA is muted when
the TxData input is inactive.
FROM VCO
FROM VCO
Figure 26. PA Configuration in FSK/GFSK Mode
Figure 27. PA Configuration in ASK/OOK Mode
R2_DB29
+
+
R2_DB(30:31)
R2_DB(30:31)
IDAC
IDAC
6
2
ASK/OOK MODE
6
6
6
0
R2_DB(9:14)
R2_DB4
R2_DB5
DIGITAL
LOCK DETECT
R2_DB(9:14)
R2_DB(15:23)
R2_DB4
R2_DB5
DIGITAL
LOCK DETECT
Rev. 0 | Page 18 of 48
The PA is equipped with overvoltage protection, which makes it
robust in severely mismatched conditions. Depending on the
application, users can design a matching network for the PA to
exhibit optimum efficiency at the desired radiated output power
level for a wide range of different antennas, such as loop or mono-
pole antennas. See the LNA/PA Matching section for details.
PA Bias Currents
Control Bits R2_DB (30:31) facilitate an adjustment of the PA
bias current to further extend the output power control range, if
necessary. If this feature is not required, the default value of
9 μA is recommended. The output stage is powered down by
resetting Bit R2_DB4. To reduce the level of undesired spurious
emissions, the PA can be muted during the PLL lock phase by
toggling this bit.
MODULATION SCHEMES
Frequency Shift Keying (FSK)
Frequency shift keying is implemented by setting the N value
for the center frequency and then toggling this with the TxData
line. The deviation from the center frequency is set using Bits
R2_DB (15:23). The deviation from the center frequency in
hertz is
where Modulation Number is a number from 1 to 511
(R2_DB (15:23)).
Select FSK using Bits R2_DB (6:8).
FSK DEVIATION
TxDATA
FREQUENCY
–F
+F
FSK
DEV
DEV
DEVIATION
4R
CHARGE
FRACTIONAL-N
Figure 28. FSK Implementation
PUMP
[
PFD/
Hz]
=
PFD
Σ-Δ MODULATOR
THIRD-ORDER
×
Modulation
2
14
INTEGER-N
Number
VCO
÷N
PA STAGE