Datasheet TH7122 (Melexis) - 9

TH7122 27 to 930MHz FSK/FM/ASK Transceiver Pin No. Name I/O Type Functional Schematic Description
27 VEE_LNA ground ground of LNA and PA 28 OUT_LNA output OUT_LNA LNA open-collector output, connection to external LC bias 28 tank at RF 37 VEE 3.8k 26 IN_LNA input LNA input, single-ended IN_LNA 26 0.8p VEE VEE 29 GAIN_LNA input VCC LNA gain control input GAIN_LNA 120 29 VEE 30 IN_MIX input VCC mixer input, approx. 200Ω single-ended 210 IN_MIX 30 LO bias VEE VEE 31 VEE_IF ground ground of IFA, Demodulator, OA1 and OA2 32 OUT_MIX output VCC mixer output, approx. 330Ω single-ended OUT_MIX 100 32 VEE 39010 07122 Page 9 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