MICRF007 Micrel MICRF007 QwikRadio Low-Power UHF Receiver General Description The MICRF007 is a single chip, ON-OFF Keyed (ASK/OOK) Receiver for remote wireless applications, employing Micrels latest QwikRadio technology. This device is a true antenna-in QwikRadio to data-out monolithic device. All RF and IF tuning is accom- Features plished automatically within the IC, which eliminates manual tuning, and reduces production costs. The result is a highly Complete UHF receiver on a monolithic chip reliable yet extremely low cost solution. The MICRF007 is an 300MHz to 440MHz enhanced version of the MICRF002 and MICRF011. Data rates up to 3.2kbps NRZ Automatic tuning, no manual adjustment The MICRF007 is a conventional superhetrodyne receiver, Low power consumption with an (internal) Local oscillator xed at a single frequency 315MHz: based on an external reference crystal or clock. As with any 2.3 mA fully operational conventional superhetrodyne receiver, the companion trans- 0.5A shutdown mitters frequency must be accurately controlled, generally 230A polled at a 10:1 duty cycle ratio with a crystal or SAW (surface acoustic wave) resonator. 433.92MHz: The MICRF007 provides two enhancements over the MI- 3.8mA fully operational CRF001/011: (1) a Shutdown Mode, which may be used for 0.5A shutdown duty-cycle operation, and (2) reduced current consumption. 380A polled at a 10:1 duty cycle ratio The MICRF007 requires a mere 2.3mA at 315MHz (3.8mA Virtually no RF re-radiation at the antenna at 433.92MHz) when fully operational. These features make CMOS logic interface to standard decoder and micro- the MICRF007 ideal for low and ultra-low power applications, processor ICs such as RKE and RFID. Extremely low external part count All post-detection (demodulator) data ltering is provided on No lters or inductors required the MICRF007, so no external baseband lters are required. Applications The demodulator lter bandwidth is xed at 2.5kHz. Data rates up to 3.2kbps NRZ may be used. Automotive remote keyless entry (RKE) Long range RF identication All support documentation can be found on Micrels web site Remote fan and light control at www.micrel.com. Garage door and gate openers Typical Application 50Ant MICRF007 4.8970MHz VSS REFOSC 1.8pF ANT CAGC 2.2F +5V VDD SHUT 56nH CTH DO Data Output 0.039F 315MHz 1200b/s On-Off Keyed Receiver QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of Orlando, Florida. Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MICRF007 Micrel Ordering Information Part Number Standard Pb-Free Junction Temp. Range Package MICRF007BM MICRF007YM 40C to +85C 8-pin SOIC Pin Conguration MICRF007BM VSS 1 8 REFOSC ANT 2 7 CAGC VDD 3 6 SHUT CTH 4 5 DO 8-Pin SOIC (M) Pin Description Pin Number Pin Name Pin Function 1 VSS Ground: Signal and power ground. 2 ANT Antenna (Analog Input): High-impedance, internally AC-coupled receiver input. For optimal performance, the ANT pin should be impedance matched to the antenna. 3 VDD Power Supply (Input): Positive supply input. Connect a low ESL, low ESR de-coupling capacitor from this pin to VSS. Lead lengths should be as short as possible. 4 CTH Data Slicing Threshold Capacitor (Analog I/O): Capacitor connected to this pin extracts the DC average value from the demodulated waveform which becomes the reference for the internal data slicing comparator. 5 DO Data Output (Digital Output): CMOS-level compatible data output signal. 6 SHUT Shutdown (Digital Input): Shutdown-mode logic-level control input. Pull low to enable the receiver. Internally pulled-up to VDD. 7 CAGC Automatic Gain Control (Analog I/O): Connect an external capacitor to set the attack/decay ratio of the on-chip automatic gain control. 8 REFOSC Reference Oscillator: Timing reference, sets the RF receive frequency. M9999-021705 2 February 17, 2005