ADF7021-N Datasheet, PDF (1/64 Pages) Analog Devices – High Performance Narrow-Band Transceiver IC

High Performance
Narrow-Band Transceiver IC
ADF7021-N
FEATURES
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
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
Patent pending, on-chip image rejection calibration
On-chip VCO and fractional-N PLL
On-chip, 7-bit ADC and temperature sensor
Fully automatic frequency control loop (AFC)
Digital received signal strength indication (RSSI)
Integrated Tx/Rx switch
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
Pagers
R_LNA
RSET
FUNCTIONAL BLOCK DIAGRAM
CE
CREG(1:4)
TEMP
SENSOR
MUX
7-BIT ADC
LDO(1:4)
MUXOUT
TEST MUX
RFIN
RFINB
LNA
IF FILTER
RSSI/
LOG AMP
2FSK
3FSK
4FSK
DEMODULATOR
CLOCK
AND DATA
RECOVERY
Tx/Rx
CONTROL
GAIN
PA RAMP
AGC
CONTROL
AFC
CONTROL
SERIAL
PORT
RFOUT
÷1/÷2
VCO1
÷2
DIV P
N/N + 1
Σ-Δ
MODULATOR
VCO2
MUX
CP
PFD
DIV R
OSC
2FSK
3FSK
4FSK
MOD CONTROL
CLK
DIV
GAUSSIAN/
RAISED COSINE
FILTER
3FSK
ENCODING
L1 L2 VCOIN CPOUT
OSC1 OSC2
Figure 1.
CLKOUT
TxRxCLK
TxRxDATA
SWD
SLE
SDATA
SREAD
SCLK
Rev. 0
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