High Performance
Narrow-Band Transceiver IC
ADF7021-N
Data Sheet
On-chip VCO and fractional-N PLL
FEATURES
On-chip, 7-bit ADC and temperature sensor
Fully automatic frequency control loop (AFC)
Digital received signal strength indication (RSSI)
Integrated Tx/Rx switch
Low power, narrow-band transceiver
Frequency bands using dual VCO
80 MHz to 650 MHz
842 MHz to 916 MHz
Programmable IF filter bandwidths of
9 kHz, 13.5 kHz, and 18.5 kHz
Modulation schemes: 2FSK, 3FSK, 4FSK, MSK
Spectral shaping: Gaussian and raised cosine filtering
Data rates supported: 0.05 kbps to 24 kbps
2.3 V to 3.6 V power supply
0.1 µA leakage current in power-down mode
APPLICATIONS
Narrow-band, short range device (SRD) standards
ARIB STD-T67, ETSI EN 300 220, Korean SRD standard,
FCC Part 15, FCC Part 90, FCC Part 95
Low cost, wireless data transfer
Remote control/security systems
Wireless metering
Wireless medical telemetry service (WMTS)
Home automation
Process and building control
Programmable output power
−16 dBm to +13 dBm in 63 steps
Automatic power amplifier (PA) ramp control
Receiver sensitivity
−130 dBm at 100 bps, 2FSK
−122 dBm at 1 kbps, 2FSK
Pagers
On-chip image rejection calibration
FUNCTIONAL BLOCK DIAGRAM
CE
RSET
MUXOUT
CREG(1:4)
TEMP
SENSOR
MUX
7-BIT ADC
R
LDO(1:4)
TEST MUX
LNA
2FSK
3FSK
4FSK
LNA
TxRxCLK
CLOCK
AND DATA
RECOVERY
R
FIN
RSSI/
LOG AMP
TxRxDATA
Tx/Rx
CONTROL
IF FILTER
R
FINB
DEMODULATOR
SWD
GAIN
AGC
CONTROL
SLE
SERIAL
PORT
SDATA
SREAD
SCLK
AFC
CONTROL
PA RAMP
2FSK
3FSK
4FSK
GAUSSIAN/
RAISED COSINE
FILTER
Σ-Δ
MODULATOR
÷1/÷2
DIV P
N/N + 1
RFOUT
MOD CONTROL
÷2
VCO1
3FSK
ENCODING
MUX
CP
PFD
VCO2
CLK
DIV
DIV R
OSC
L1 L2
VCOIN CPOUT
OSC1 OSC2
CLKOUT
Figure 1.
Rev. B
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