MICRF104BM Micrel Inc, MICRF104BM Datasheet
MICRF104BM
Specifications of MICRF104BM
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MICRF104BM Summary of contents
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... Automatic antenna alignment, no manual adjustment • Low external part count Applications • Remote Keyless Entry Systems (RKE) • Remote Fan/Light Control • Garage Door Opener Transmitters • Remote Sensor Data Links Ordering Information Part Number MICRF104BM MICRF104 1 14 VDDPWR Supply ...
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... ASK ANTM 7 8 ANTP MICRF104BM Pin Function Positive power supply input for the DC/DC converter. Ground return 5V Output from the converter This is the timing reference frequency which is the transmit frequency divided by 32. Connect a crystal (mode dependent) between this pin and VSS, or drive the input with an AC coupled 0 ...
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MICRF104 Absolute Maximum Ratings Supply Voltage .................................. +6V DDPWR DDRF Voltage on I/O Pin EN .................................................. [tbd] Voltage on I/O Pins, RFSTBY, ASK, PC, ANTP, ANTM V –0 +0 Storage Temperature Range ................... ...
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MICRF104 Parameter Condition Digital / Control Section Calibration time Note 8, ASK=HIGH Power amplifier output hold off Note 9, STDBY transition from LOW to HIGH time from STBY Crystal, ESR < 20 Transmitter Stabilization Time From External Reference (500mVpp) From ...
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MICRF104 Typical Characteristics Output Power vs PC Pin Voltage -10 -15 -20 -25 -30 -35 0 100 200 300 400 500 600 V (mV) PC November 8, 2001 Mark Current vs PC Pin Voltage ...
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MICRF104 Functional Diagram VDDPWR EN VSS Reference STBY Bias VDD VDDRF PC Phase Detector (2) REF.OSC Reference Oscillator (1) Functional Description The block diagram illustrates the basic structure of the RF portion of the MICRF104. Identified in the figure are ...
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MICRF104 a complete UHF transmitter for remote actuation applications such as automotive keyless entry. Included within the differential varactor that serves as the tuning element to insure that the transmit frequency and antenna are aligned with the ...
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MICRF104 Applications Information Design Process The MICRF104 transmitter design process is as follows: 1). Set the transmit frequency by providing the correct reference oscillator frequency 2). Ensure antenna resonance at the transmit frequency by: a. Either, matching antenna inductance to ...
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MICRF104 L = 45.1nH The value of the capacitor is calculated as 5.66pF. Supply Bypassing Correct supply bypassing is essential. A 4.7uF capacitor in parallel with a 100pF capacitor is required and an additional 0.1 F capacitor in parallel is ...
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... TEL This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. MICRF104 PIN 1 ...