ATA5745_07 Datasheet, PDF (1/44 Pages) ATMEL Corporation – UHF ASK/FSK Receiver

Features
• Transparent RF Receiver ICs for 315 MHz (ATA5746) and 433.92 MHz (ATA5745) With
High Receiving Sensitivity
• Fully Integrated PLL With Low Phase Noise VCO, PLL, and Loop Filter
• High FSK/ASK Sensitivity:–105 dBm (ATA5746, FSK, 9.6 Kbits/s, Manchester, BER 10^-3)
–114 dBm (ATA5746, ASK, 2.4 Kbits/s, Manchester, BER 10^-3)
–104 dBm (ATA5745, FSK, 9.6 Kbits/s, Manchester, BER 10^-3)
–113 dBm (ATA5745, ASK, 2.4 Kbits/s, Manchester, BER 10^-3)
• Supply Current: 6.5 mA in Active Mode (3V, 25°C, ASK Mode)
• Data Rate: 1 Kbit/s to 10 Kbits/s Manchester ASK, 1 Kbit/s to 20 Kbits/s Manchester
FSK With Four Programmable Bit Rate Ranges
• Switching Between Modulation Types ASK/FSK and Different Data Rates Possible in
≤1 ms Typically, Without Hardware Modification on Board to Allow Different Modulation
Schemes for RKE, TPMS
• Low Standby Current: 50 µA at 3V, 25°C
• ASK/FSK Receiver Uses a Low-IF Architecture With High Selectivity, Blocking, and
Low Intermodulation (Typical 3-dB Blocking 68.0 dBC at ±3 MHz/74.0 dBC at
±20.0 MHz, System I1dBCP = –31 dBm/System IIP3 = –24 dBm)
• Telegram Pause Up to 52 ms Supported in ASK Mode
• Wide Bandwidth AGC to Handle Large Out-of-band Blockers above the System I1dBCP
• 440-kHz IF Frequency With 30-dB Image Rejection and 420-kHz IF Bandwidth to
Support PLL Transmitters With Standard Crystals or SAW-based Transmitters
• RSSI (Received Signal Strength Indicator) With Output Signal Dynamic Range of 65 dB
• Low In-band Sensitivity Change of Typically ±2.0 dB Within ±160-kHz Center
Frequency Change in the Complete Temperature and Supply Voltage Range
• Sophisticated Threshold Control and Quasi-peak Detector Circuit in the Data Slicer
• Fast and Stable XTO Start-up Circuit (> –1.4 kΩ Worst-case Start Impedance)
• Clock Generation for Microcontroller
• ESD Protection at all Pins (±4 kV HBM, ±200V MM, ±500V FCDM)
• Dual Supply Voltage Range: 2.7V to 3.3V or 4.5V to 5.5V
• Temperature Range: –40°C to +105°C
• Small 5 mm × 5 mm QFN24 Package
UHF ASK/FSK
Receiver
ATA5745
ATA5746
Preliminary
Applications
• Automotive Keyless Entry and Tire Pressure Monitoring Systems
• Alarm, Telemetering and Energy Metering Systems
Benefits
• Supports Header and Blanking Periods of Protocols Common in RKE and TPM
Systems (Up to 52 ms in ASK Mode)
• All RF Relevant Functions are Integrated. The Single-ended RF Input is Suited for Easy
Adaptation to λ / 4 or Printed-loop Antennas
• Allows a Low-cost Application With Only 8 Passive Components
• Suitable for use in a Receiver for Joint RKE and TPMS
• Optimal Bandwidth Maximizes Sensitivity while Maintaining SAW Transmitter
Compatibility
• Clock Output Provides an External Microcontroller Crystal-precision Time Reference
• Well Suited for Use With PLL Transmitter ATA5756/ATA5757
4596B–RKE–06/07