RFRXD0420-I/LQ Microchip

16 DEMIN 15 2IFOUT 14 VDD 13 FBC2 12 FBC1 11 2IFIN 10 VSS 9 1IFOUT rfRXD0420/0920 UHF ASK/FSK/FM Receiver Features: Pin Diagram: Low cost single conversion superheterodyne LQFP receiver architecture Compatible with rfPIC and rfHCS series of RF transmitters Easy interface to PICmicro microcontroller (MCU) and KEELOQ decoders VSS 1 24 DEMOUT- VCO phase locked to quartz crystal reference: LNAGAIN 2 23 DEMOUT+ LNAOUT 3 22 VSS - Narrow receiver bandwidth rfRXD0420 1IFIN 4 21 RSSI - Maximizes range and interference immunity VSS 5 20 OPA+ rfRXD0920 1IF+ 6 19 OPA- Selectable LNA gain control for improved dynamic 1IF- 7 18 OPA range VDD 8 17 VDD Selectable IF bandwidth via external ceramic IF filter Received Signal Strength Indicator (RSSI) for signal strength indication (FSK, FM) and ASK demodulation FSK/FM quadrature (phase coincidence) detector demodulator 32-Lead LQFP package Applications: UHF ASK/FSK Receiver: Wireless remote command and control Wireless security systems Single frequency receiver set by crystal frequency Remote Keyless Entry (RKE) Receive frequency range: Low power telemetry Device Frequency Range Low power FM receiver rfRXD0420 300 MHz to 450 MHz Home automation rfRXD0920 800 MHz to 930 MHz Remote sensing Maximum data rate: - ASK: 80 Kbps NRZ Bi-CMOS Technology: - FSK: 40 Kbps NRZ Wide operating voltage range IF frequency range: 455 kHz to 21.4 MHz Low current consumption in Active and Standby RSSI range: 70 dB modes Frequency deviation range: 5 kHz to 120 kHz - rfRXD0420 Maximum FM modulation frequency: 15 kHz - 8.2 mA (typical, LNA High Gain mode) - <100 nA standby - rfRXD0920 - 9.2 mA (typical, LNA High Gain mode) - <100 nA standby Wide temperature range: - Industrial: -40C to +85C 2003 Microchip Technology Inc. Preliminary DS70090A-page 1 32 VDD 31 LNAIN 30 VSS 29 LF 28 ENRX 27 VDD 26 XTAL 25 VSSrfRXD0420/0920 The rfRXD0420/0920 is a single conversion superhet- 1.0 DEVICE OVERVIEW erodyne architecture. A block diagram is illustrated in The rfRXD0420/0920 are low cost, compact single Figure 1-1. The rfRXD0420/0920 consists of: frequency short-range radio receivers requiring only a Low-noise amplifier (LNA) - Gain selectable minimum number of external components for a Mixer for down-conversion of the RF signal to the complete receiver system. The rfRXD0420 covers the Intermediate Frequency (IF) followed by an IF receive frequency range of 300 MHz to 450 MHz and preamplifier the rfRXD0920 covers 800 MHz to 930 MHz. The Fully integrated Phase-Locked Loop (PLL) rfRXD0420 and rfRXD0920 share a common architec- frequency synthesizer for generation of the Local ture. They can be configured for Amplitude Shift Keying Oscillator (LO) signal. The frequency synthesizer (ASK), Frequency Shift Keying (FSK), or FM modula- consists of: tion. The rfRXD0420/0920 are compatible with rfPIC and rfHCS series of RF transmitters. - Crystal oscillator - Phase-frequency detector and charge pump High frequency stability over temperature and power supply variations - High-frequency Voltage Controlled Oscillator (VCO) Low spurious signal emission - Fixed feedback divider High large-signal handling capability with selectable LNA gain control for improved dynamic - rfRXD0420 = divide by 16 range - rfRXD0920 = divide by 32 Selectable IF bandwidth via external low cost IF limiting amplifier to amplify and limit the IF ceramic IF filter. The IF Frequency range is signal and for Received Signal Strength Indication selectable between 455 kHz to 21.4 MHz. This (RSSI) generation facilitates the use of readily available low cost Demodulator (DEMOD) section consists of a 10.7 MHz ceramic IF filters in a variety of phase detector (MIXER2) and amplifier creating a bandwidths. quadrature detector (also known as a phase ASK or FSK for digital data reception coincidence detector) to demodulate the IF signal FM modulation for analog signal reception in FSK and FM modulation applications FSK/FM demodulation using quadrature detector Operational amplifier (OPA) that can be config- (phase coincidence detector) ured as a comparator for ASK or FSK data decision or as a filter for FM modulation. Received Signal Strength Indication (RSSI) for signal strength indication and ASK detection Bias circuitry for bandgap biasing and circuit shutdown Wide supply voltage range Low active current consumption Very low standby current DS70090A-page 2 Preliminary 2003 Microchip Technology Inc.