TH71221_15 Datasheet, PDF (1/44 Pages) Melexis Microelectronic Systems – FSK/FM/ASK Transceiver

TH71221
27 to 930MHz
FSK/FM/ASK Transceiver
Features
 Single chip solution with only a few external
components
 Stand-alone fixed-frequency user mode
 Programmable multi-channel user mode
 Low current consumption in active mode and
very low standby current
 PLL-stabilized RF VCO (LO) with internal
varactor diode
 Lock detect output in programmable
user mode
 On-chip AFC for extended input frequency
acceptance range
 3wire bus serial control interface
 FSK/ASK mode selection
 FSK for digital data or FM for analog signal
reception
 RSSI output for signal strength indication and
ASK reception
 Peak detector for ASK detection
 Switchable LNA gain for improved dynamic
range
 Automatic PA turn-on after PLL lock
 ASK modulation achieved by PA on/off keying
 32-pin Quad Flat Lead Package (QFN)
Ordering Code
Product Code
TH71221
TH71221
Temperature Code
E
E
Package Code Option Code
LQ
BAA-000
LQ
BAA-000
Legend:
Temperature Code:
Package Code:
Packing Form:
E for Temperature Range -40°C to 85°C
LQ for QFN,
RE for Reel, TU for Tube
Ordering example:
TH71221ELQ-BAA-000-RE
Packing Form Code
RE
TU
Application Examples
 General bi-directional half duplex digital data
RF signaling or analog signal communication
 Remote Keyless Entry (RKE)
 Low-power telemetry systems
 Alarm and security systems
 Wireless access control
 Garage door openers
 Networking solutions
 Active RFID tags
 Remote controls
 Home and building automation
Pin Description
top
bottom
IN_IFA
VCC_IF
IN_DEM
INT2/PDO
INT1
OUT_DEM
RSSI
OUT_DTA
TH71221
LF
VEE_PLL
TNK_LO
VCC_PLL
FS1/LD
VEE_DIG
FS0/SDEN
General Description
The TH71221 is a single chip FSK/FM/ASK transceiver IC. It is designed to operate in low-power multi-
channel programmable or single-channel stand-alone, half-duplex data transmission systems. It can be used
for applications in automotive, industrial-scientific-medical (ISM), short range devices (SRD) or similar appli-
cations operating in the frequency range of 300 MHz to 930 MHz. In programmable user mode, the trans-
ceiver can operate down to 27 MHz by employing an external VCO varactor diode.
39010 071221
Rev. 009
Page 1 of 44
Data Sheet
Nov/15