Data Sheet
FEATURES
High performance, low power, narrow-band transceiver
Enhanced performance
ADF7021-N
with external VCO
Frequency bands using external VCO: 80 MHz to 960 MHz
Improved adjacent channel power (ACP) and adjacent
channel rejection (ACR) compared with the
ADF7021-N
Programmable IF filter bandwidths: 9 kHz, 13.5 kHz,
and 18.5 kHz
Modulation schemes: 2FSK, 3FSK, 4FSK, MSK
Spectral shaping: Gaussian and raised cosine filtering
Data rates: 0.05 kbps to 24 kbps
Power supply: 2.3 V to 3.6 V
Programmable output power: −16 dBm to +13 dBm
in 63 steps
Automatic power amplifier (PA) ramp control
Receiver sensitivity
−125 dBm at 250 bps, 2FSK
−122 dBm at 1 kbps, 2FSK
Patent pending, on-chip image rejection calibration
High Performance,
Narrow-Band Transceiver IC
ADF7021-V
On-chip fractional-N PLL
On-chip, 7-bit ADC and temperature sensor
Fully automatic frequency control (AFC) loop
Digital received signal strength indication (RSSI)
Integrated Tx/Rx switch
Leakage current in power-down mode: 0.1 μA
APPLICATIONS
Narrow-band, short-range device (SRD) standards
ETSI EN 300 220
500 mW output power capability in 869 MHz g3 subband
with external PA
High performance receiver rejection, blocking, and
adjacent channel power (ACP)
FCC Part 90 (meets Emission Mask D requirements)
FCC Part 95
ARIB STD-T67
Wireless metering
Narrow-band wireless telemetry
FUNCTIONAL BLOCK DIAGRAM
RSET
TEMP
SENSOR
CE
CREG[1:4]
MUXOUT
MUX
7-BIT ADC
R
LNA
LDO[1:4]
TEST MUX
LNA
RFIN
RFIN
IF FILTER
RSSI/
LOG AMP
2FSK
3FSK
4FSK
DEMODULATOR
CLOCK
AND DATA
RECOVERY
TxRxCLK
Tx/Rx
CONTROL
TxRxDATA
SWD
GAIN
AGC
CONTROL
SLE
SERIAL
PORT
SDATA
SREAD
SCLK
ADF7021-V
PA RAMP
AFC
CONTROL
RFOUT
÷1/÷2
÷2
DIV P
N/N + 1
Σ-∆
MODULATOR
2FSK
3FSK
4FSK
MOD CONTROL
GAUSSIAN/
RAISED COSINE
FILTER
BUFFER
3FSK
ENCODING
CP
PFD
DIV R
OSC
CLK
DIV
08635-001
L2
CPOUT
OSC1
OSC2
CLKOUT
Figure 1.
Rev. B
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Data Sheet
REVISION HISTORY
9/14—Rev. A to Rev. B
Changes to Table 8 ..........................................................................16
Change to RSSI Formula (Converting to dBm) Section ............30
Change to Postdemodulator Filter Setup Section .......................33
Change to When to Use Fine Calibration Section ......................38
Change to Battery Voltage/ADCIN/Temperature Sensor
Readback Section ............................................................................44
Change to Register 4—Demodulator Setup Register Section .......50
Change to Register 7—Readback Setup Register Section..............53
Change to Register 4—AFC Register Section ................................56
ADF7021-V
8/12—Rev. 0 to Rev. A
Changes to Figure 6 ........................................................................ 15
Updated Outline Dimensions........................................................ 60
Changes to Ordering Guide ........................................................... 60
4/10—Revision 0: Initial Version
Rev. B | Page 3 of 66
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