Datasheet TH7122 (Melexis) - 6

TH7122 27 to 930MHz FSK/FM/ASK Transceiver 2 Pin Definitions and Descriptions Pin No. Name I/O Type Functional Schematic Description
1 IN_IFA input VCC VCC IF amplifier input, approx. 2 kΩ single-ended 2.2k IN_IFA 50 1 140µA VEE VEE 2 VCC_IF supply positive supply of LNA, MIX, IFA, FSK Demodulator, PA, OA1 and OA2 3 IN_DEM analog I/O VCC VCC IF amplifier output and de- modulator input, connection 90k to external ceramic discrimi- IN_DEM 60k nator or LC tank 3 1.5p 10µA 100µA VEE VEE 4 INT2/PDO output VCC OA2 output or peak detector output, high impedance in INT2/PDO transmit and idle mode 4 VEE 5 INT1 input VCC VCC 200k inverting inputs of OA1 and OA2 + INT1 0 120
OA1
12 5 OUT_DEM 6 OUT_DEM analog I/O VCC demodulator output and 6 VEE non-inverting OA1 input, 0k 0 12 bias 55 high impedance in transmit 1k and idle mode
OA2
550k 10p 10p VEE 7 RSSI output VCC VCC RSSI output, approx. 33 kΩ 5µA RSSI 120 7 5µA VEE VEE 39010 07122 Page 6 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