MICRF104BM 查看數據表（PDF） - Micrel

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MICRF104BM

1.8V, QwikRadio™ UHF ASK Transmitter

Micrel 

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

0.1µF capacitor in parallel is recommended.

The MICRF104 is susceptible to supply-line ripple, if supply

regulation is poor or bypassing is inadequate, spurs will be

evident in the transmit spectrum.

Transmit Power

The transmit power specified in this datasheet is normalized

to a 50Ohm load. The antenna efficiency will determine the

actual radiated power. Good antenna design will yield trans-

mit power in the range of 67dBµV/m to 80dBµV/m at 3 meters.

The PC pin on the MICRF104 is used to set the transmit

power. The differential voltage on the output of the PA (power

amplifier) is proportional to the voltage at the PC pin.

Micrel

If the PC pin voltage rises above 0.4 V the output power

becomes current limited. At this point, further increase in the

PC pin voltage will not increase the RF output power in the

antenna pins. Low power consumption is achieved by de-

creasing the voltage in the PC pin, also reducing the RF

output power and maximum range.

Output Blanking

When the device is first powered up or after a momentary loss

of power the output is automatically blanked (disabled). This

feature ensures RF transmission only occurs under con-

trolled conditions when the synthesizer is fully operational,

preventing unintentional transmission at an undesired fre-

quency. Output blanking is key to guaranteeing compliance

with UHF regulations by ensuring transmission only occurs in

the intended frequency band.

November 8, 2001

9

MICRF104

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