MICRF103

Features:

• Complete UHF transmitter on a monolithic chip
• Frequency range 800MHz to 1GHz
• Data rates to 115kbps
• Automatic antenna alignment, no manual adjustment
• Low external part count
• Low standby current <1A




Application

• Remote keyless entry systems (RKE)
• Remote fan/light control
• Garage door opener transmitters
• Remote sensor data links




Pinout

Pin Number Pin Name Pin Function 1 PC Power Control Input. The voltage at this pin should be set between 0.1V to 0.4V for normal operation. 2 VDD Positive power supply input for the IC. 3 VSS This pin is the ground return for the IC. A power supply bypass capacitor connected from VDD to VSS should have the shortest possible path. 4 REFOSC This is the timing reference frequency which is the transmit frequency divided by 64. Connect a crystal (mode dependent) between this pin and VSS, or drive the input with an AC coupled 0.5Vpp input clock. See Reference Oscillator section in this data sheet under Electrical Characteristics. 5 STBY Input for transmitter stand-by control pin is pulled to VDD for transmit operation and VSS for stand-by mode. 6 ANTM Negative RF power output to drive one side of the transmit antenna. 7 ANTP Positive RF power output to drive the other side of the transmit antenna. 8 ASK Amplitude Shift Key modulation data input pin. For CW operation, connect this pin to VDD.

Specifications

Supply Voltage(V_DD) ........................................................+6V
Voltage on I/O Pins ............................... 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 MICRF103 is a single chip Transmitter IC for remote wireless applications. The device employs Micrel's latest QwikRadio™ technology. This device is a true "data-in, antenna-out" monolithic 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. Because the MICRF103 is a true single-chip radio transmitter, it is easy to apply, minimizing design and production costs, and improving time to market. The MICRF103 uses a novel architecture where the external antenna is tuned by the internal UHF synthesizer. This transmitter is designed to comply worldwide UHF unlicensed band international radio regulations. The IC 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 up to 115k bits per second.

The automatic tuning of MICRF103 in conjunction with an external resistor, insures that the transmitter output power stays constant at maximum regulatory transmit power limits for the life of the battery.

When coupled with Micrel's family of QwikRadio™ receivers, the MICRF103 provides the lowest cost and most reliable remote actuator and RF link system available.