Datasheet TH7122 (Melexis)

TH7122 27 to 930MHz FSK/FM/ASK Transceiver Features
! Single chip solution with only a few external ! 3wire bus serial control interface components ! FSK/ASK mode selection ! Stand-alone fixed-frequency user mode ! FSK for digital data or FM for analog signal ! Programmable multi-channel user mode reception ! Low current consumption in active mode and ! RSSI output for signal strength indication and very low standby current ASK reception ! PLL-stabilized RF VCO (LO) with internal ! Peak detector for ASK detection varactor diode ! Switchable LNA gain for improved dynamic ! Lock detect output in programmable range user mode ! Automatic PA turn-on after PLL lock ! On-chip AFC for extended input frequency ! ASK modulation achieved by PA on/off keying acceptance range ! 32-pin Low profile Quad Flat Package (LQFP)
Ordering Information Part Number Temperature Code Package Code Delivery Form
250 pc/tray TH7122 E (-40 °C to 85 °C) NE (LQFP32) 2000 pc/T&R
Application Examples Pin Description
N L LL IG E ! General bi-directional half duplex digital data LO P D PL _ LD D /S RF signaling or analog signal communication K 1/ 0 CC_ S LF VEE_ TN V F VEE_ FS ! Tire Pressure Monitoring Systems (TPMS) ! Remote Keyless Entry (RKE) 24 17 25 16 ! Low-power telemetry systems OUT_PA IN_LNA RE/SCLK ! Alarm and security systems VEE_LNA VCC_DIG ! Wireless access control OUT_LNA ASK/FSK TH7122 GAIN_LNA IN_DTA ! Garage door openers IN_MIX FSK_SW VEE_IF RO ! Networking solutions OUT_MIX VEE_RO 32 9 ! Active RFID tags 1 8 ! Remote controls 1 ! Home and building automation A M T M _IF E E TA _IF DO SSI C IN D R D _ IN _D 2/P _ T VC IN T T IN OU OU
General Description
The TH7122 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 07122 Page 1 of 44 Data Sheet Rev. 008 June/07 Document Outline Features Ordering Information Application Examples Pin Description General Description Document Content 1 Theory of Operation 1.1 General 1.2 Technical Data Overview 1.3 Note on ASK Operation 1.4 Block Diagram 1.5 User Mode Features 2 Pin Definitions and Descriptions 3 Functional Description 3.1 PLL Frequency Synthesizer 3.1.1 Reference Oscillator (XOSC) 3.1.2 Reference Divider 3.1.3 Feedback Divider 3.1.4 Frequency Resolution and Operating Frequency 3.1.5 Phase-Frequency Detector 3.1.6 Lock Detector 3.1.7 Voltage Controlled Oscillator with external Loop Filter 3.1.8 Loop Filter Receiver Part 3.2.1 LNA 3.2.2 Mixer 3.2.3 IF Amplifier 3.2.4 ASK Demodulator 3.2.5 FSK Demodulator 3.3 Transmitter Part 3.3.1 Power Amplifier Output Power Adjustment 3.3.3 Modulation Schemes 3.3.4 ASK Modulation 3.3.5 FSK Modulation 3.3.6 Crystal Tuning 4 Description of User Modes 4.1 Stand-alone User Mode Operation 4.1.1 Frequency Selection 4.1.2 Operation Mode 4.1.3 Modulation Type 4.1.4 LNA Gain Mode 4.2 Programmable User Mode Operation 4.2.1 Serial Control Interface Description 5 Register Description 5.1 Register Overview 5.1.1 Default Register Settings for FS0, FS1 5.1.2 A – word 5.1.3 B – word 5.1.4 C – word 5.1.5 D – word 6 Technical Data 6.1 Absolute Maximum Ratings 6.2 Normal Operating Conditions 6.3 DC Characteristics 6.4 PLL Synthesizer Timings 6.5 AC Characteristics of the Receiver Part 6.6 AC Characteristics of the Transmitter Part 6.7 Serial Control Interface 6.8 Crystal Parameters 7 Application Circuit Examples 7.1 FSK Application Circuit Programmable User Mode (internal AFC option) 7.2 FSK Application Circuit Stand-alone User Mode 7.3 FSK Test Circuit Component List (Fig. 14 and Fig. 15) 7.4 ASK Application Circuit Programmable User Mode (normal data slicer option) 7.5 ASK Test Circuit Component List (Fig. 16) 7.6 ASK Application Circuit Programmable User Mode (peak detector option) 7.7 ASK Test Circuit Component List (Fig. 17) 8 Extended Frequency Range 8.1 Board Component List (Fig. 18) 9 TX/RX Combining Network 9.1 Board Component List (Fig. 19) 9.2 Typical LNA S-Parameters in Receive Mode 9.3 LNA Input Impedances in Transmit Mode 10 Package Description 10.1 Soldering Information 11 Reliability Information 12 ESD Precautions Your Notes 13 Disclaimer