MICRF009

Features:

• High sensitivity (104dBm)
• Fast recovery from shutdown (1ms)
• 300MHz to 440MHz frequency range
• Data-rate up to 2.0kbps (fixed-mode, Manchester encoding)
• Low power consumption
2.9mA fully operational (315MHz)
0.15A in shutdown
290A in polled mode (10:1 duty-cycle)
• Shutdown input
• Automatic tuning, no manual adjustment
• Very low RF re-radiation at the antenna
• Highly integrated with extremely low external part count
• 1ms time to good data




Application

• Automotive remote keyless entry (RKE)
• Long range RF identification
• Remote fan and light control
• Garage door and gate openers




Specifications

Supply Voltage (V_DDRF, V_DDBB)........................................+7V
Input/Output Voltage (V_I/O)..................V_SS0.3 to V_DD+0.3
Max. Input Power.....................................................+20dBm
Junction Temperature (T_J)........................................+150°C
Storage Temperature Range (T_S)...........65°C to +150°C
Lead Temperature (soldering, 10 sec.)....................+260°C
ESD Rating..................................................................Note 3




Description

The MICRF009 is a single chip, ASK/OOK (ON-OFF Keyed) RF receiver IC. It provides the same function but with performance enhancements over earlier QwikRadio® receivers. Two key improvements are: higher sensitivity (typically 6dB higher than the MICRF002) and faster recovery from shutdown (typically 1ms). Just like all other members of the QwikRadio® family, the MICRF009 achieves low power operation, a very high level of integration, and it is particularly easy to use.

All post-detection (demodulator) data filtering is provided on the MICRF009, so no external baseband filters are required. One of two filter bandwidths may be selected externally by the user. The user only needs to program the appropriate filter selection based on the data rate and code modulation format.

The MICRF009 offer two modes of operation; fixed-mode (FIX) and sweep-mode (SWP). In fixed-mode the MICRF009 functions as a conventional superheterodyne receiver. In sweep-mode the MICRF009 employs a patented sweeping function to sweep a wider RF spectrum. Fixed-mode provides better selectivity and sensitivity performance while sweep mode enables the MICRF009 to be used with low-cost, imprecise transmitters.

Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.