TH71221 Product Information DownloadLink 5041

Automotive ICs
TH71221
27 to 930MHz Transceiver
Hall ICs
Intelligent Drivers
and Actuators
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 applications operating in the frequency range of 300 MHz to 930 MHz. In
programmable user mode, the transceiver can operate
down to 27 MHz by employing an external VCO varactor
diode.
Features
IR Temperature
315 MHz, 433 MHz, 868 MHz or 915 MHz fixed settings in stand-alone mode
Extended frequency range with external VCO varactor diode: 27 MHz to 930 MHz
Frequency range: 300 MHz to 930 MHz in programmable user mode
Power supply range: 2.2 V to 5.5 V
Temperature range: -40 °C to +85 °C
Standby current: 50 nA
Operating current in receive: 6.5 mA (low gain)
Operating current in transmit: 12 mA (at –2 dBm)
Adjustable RF power range: –20 dBm to +10 dBm
Sensitivity: -105 dBm at FSK with 180 kHz IF filter BW
Sensitivity: -107 dBm at ASK with 180 kHz IF filter BW
Max. input level: –10 dBm at FSK and -20 dBm at ASK
FM/FSK deviation range: ±2.5 to ±80 kHz
Max. data rate with crystal pulling: 20 kbps NRZ
Max. data rate with direct VCO modulation: 115 kbps NRZ
Input frequency acceptance: ± 10 to ± 150 kHz
(depending on FSK deviation)
Bus ICs
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CMOS Imaging
Technical Data Overview
Silicon MEMS
• 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 No-Lead (QFN 5x5 Quad)
RF&RFID
• Single chip solution with only a few
external components
• Stand-alone fixed-frequency user mode
• Programmable multi-channel user mode
• 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
• 3 wire bus serial control interface
7
3 IN_DEM
RSSI
2
VCC_IF
1
IN_IFA
31
VEE_IF
32
OUT_MIX
6 OUT_DEM
PKDET
SW1
1.5pF
26
MIX
LNA
INT2/PDO
5
INT1
MIX
IFA
IF
SW2
OA1
Hall ICs
Control Logic
RO
FSK
19
9
12
13
15
16
TE/SDTA
11
RE/SCLK
22 VEE_PLL 10 RO
ASK/FSK
23 LF
IN_DTA
21 TNK_LO 20 VCC_PLL
VEE_RO
24 PS_PA
FS1/LD
PA
17
FS0/SDEN
RO
FSK_SW
18
14
Applications
Low-power telemetry systems
Home and building automation
Alarm and security systems
Garage door openers
Active RFID tags
3wire bus
CB7
VCC
FSK
input
IN_DTA 12
32L QFN 5x5
FSK_SW 11
CX2
3
OUT_DTA
2
RSSI
1
OUT_DEM
RO 10
INT1
CERFIL
31 VEE_IF
OUT_MIX
32
SDTA
SCLK
ASK/FSK 13
TH71221
30 IN_MIX
CB1
FS1/LD 19
VCC_DIG 14
29 GAIN_LNA
C1
TNK_LO 21
27 VEE_LNA
IN_DEM
L1
26 IN_LNA
28 OUT_LNA
C2
SDEN
16
RE/SCLK 15
VCC_IF
CMOS Imaging
CRX0
OUT_PA
VEE_PLL 22
25
LF 23
CTX4
CTX0
Combining
network
Lock
detect
L0
VEE_DIG 18
FS0/SDEN
17
RPS
LTX0
VCC
CB6
RF
24
RX_IN
TX_OUT
Bus ICs
CF1
CF2
CB2
INT2/PDO
Evaluation Board
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VCC_PLL 20
• General bi-directional half duplex digital data
RF signaling or analog signal communication
• Tire Pressure Monitoring Systems (TPMS)
• Remote Keyless Entry (RKE)
• Networking solutions
IN_IFA
Intelligent Drivers
and Actuators
RF&RFID
Silicon MEMS
VCO
SDTA
25
SCI
R
counter
SCLK
N
counter
SDEN
OUT_PA
8
OUT_DTA
200k
LO
ASK
4
OA2
VCC_DIG
IN_LNA
bias
FSK Demodulator
VEE_DIG
30
IN_MIX
28
OUT_LNA
29
GAIN_LNA
27
VEE_LNA
Automotive ICs
Block Diagram
4
5
6
7
8
C3
FSK Application Circuit
CB5
(internal AFC Option)
CB4
C4
C5
RP
CERDIS
CB0
9
XTAL CX1
VEE_RO
FSK
output
VCC
Email Europe and rest of the world:
[email protected]
Email USA :
[email protected]
For additional information go to our website at:
Email Asia:
[email protected]
Feb 2007
IR Temperature
Disclaimer:
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by
description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to change specifications and
prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product is intended for use
in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical lifesupport or life-sustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnished by Melexis is believed to be
correct and accurate. However, Melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss
of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical
data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis’ rendering of technical or other services.
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