MICRF104

Features:

• Complete UHF transmitter on a chip
• Frequency range 300MHz to 470MHz
• Data rates to 20kbps
• Automatic antenna alignment, no manual adjustment
• Low external part count




Application

• Remote Keyless Entry Systems (RKE)
• Remote Fan/Light Control
• Garage Door Opener Transmitters
• Remote Sensor Data Links




Specifications

Supply Voltage(V_DDPWR, V_DDRF) ........................................+6V
Voltage on I/O Pin EN ...................................................... [tbd]
Voltage on I/O Pins, RFSTBY, ASK, PC, ANTP, ANTM
V_SS0.3 to V_DD+0.3
Storage Temperature Range ..................... -65°C to + 150°C
Lead Temperature (soldering, 10 seconds) .............. + 300°C
ESD Rating .................................................................... Note 3




Description

The MICRF104 is a low voltage Transmitter IC for remote wireless applications. The device employs Micrel's latest QwikRadio™ technology. This device is a true "data-in, antenna-out" device. All antenna tuning is accomplished automatically within the IC which eliminates manual tuning, and reduces production costs. The result is a highly reliable yet extremely low cost solution for high volume wireless applications. The MICRF104 incorporates a DC/DC converter to boost the input voltage up to 5V for the RF portion of the IC. This feature enables the MICRF104 to operate off supply voltages as low as 1.8V and transmit at power in excess of 2dBm.

The MICRF104 uses a novel architecture where the external loop antenna is tuned to the internal UHF synthesizer. This transmitter is designed to comply worldwide UHF unlicensed band intentional radiator regulations. The IC MICRF104 is compatible with virtually all ASK/OOK (Amplitude Shift Keying/On-Off Keyed) UHF receiver types from wide-band super-regenerative radios to narrow-band, high performance super-heterodyne receivers. The transmitter is designed to work with transmitter data rates from 100 to 20k bits per second.

The automatic tuning of MICRF104 in conjunction with the external resistor, insures that the transmitter output power stays constant for the life of the battery.

When coupled with Micrel's family of QwikRadio™ receivers, the MICRF104 provides the lowest cost and most reliable remote actuator and RF link system available.