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 Information
Part Number
TH71221
Temperature Code
E (-40 °C to 85 °C)
Package Code
LQ (32 L QFN 5x5 Quad)
Delivery Form
73 pc/tube
5000 pc/T&R
Application Examples
!
General bi-directional half duplex digital data
RF signaling or analog signal communication
!
Tire Pressure Monitoring Systems (TPMS)
!
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
OUT_MIX
VEE_IF
IN_MIX
GAIN_LNA
OUT_LNA
VEE_LNA
IN_LNA
OUT_PA
bottom
IN_IFA
VCC_IF
IN_DEM
INT2/PDO
INT1
OUT_DEM
RSSI
OUT_DTA
TH71221
VEE_RO
RO
FSK_SW
IN_DTA
ASK/FSK
VCC_DIG
RE/SCLK
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. 005
Page 1 of 44
Data Sheet
June/07
MELEXIS [ Melexis Microelectronic Systems ]
