TH71221
27 to 930MHz
FSK/FM/ASK Transceiver
Features
! Single chip solution with only a few external
components
! 3wire bus serial control interface
! FSK/ASK mode selection
! Stand-alone fixed-frequency user mode
! Programmable multi-channel user mode
! Low current consumption in active mode and
very low standby current
! FSK for digital data or FM for analog signal
reception
! RSSI output for signal strength indication and
ASK reception
! 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
! 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 Information
Part Number
Temperature Code
Package Code
Delivery Form
73 pc/tube
5000 pc/T&R
TH71221
E (-40 °C to 85 °C)
LQ (32 L QFN 5x5 Quad)
Application Examples
Pin Description
! General bi-directional half duplex digital data
RF signaling or analog signal communication
! Tire Pressure Monitoring Systems (TPMS)
! Remote Keyless Entry (RKE)
bottom
top
! Low-power telemetry systems
! Alarm and security systems
! Wireless access control
IN_IFA
VCC_IF
IN_DEM
INT2/PDO
INT1
LF
VEE_PLL
TNK_LO
VCC_PLL
FS1/LD
VEE_DIG
FS0/SDEN
TH71221
! Garage door openers
OUT_DEM
RSSI
OUT_DTA
!
!
Networking solutions
Active RFID tags
! Remote controls
Home and building automation
!
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. 005
Page 1 of 44
Data Sheet
June/07