MICRF103

Micrel

MICRF103

4

June 2002

Note 1.

Exceeding the absolute maximum rating may damage the device.

Note 2.

The device is not guaranteed to function outside its operating rating.

Note 3.

Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.

Note 4.

After the release of the STDBY, the device requires an initialization time to settle the REFOSC and the internal PLL. The first MARK state

(ASK HIGH) after exit from STDBY needs to be longer than the initialization time. The subsequent low to high transitions will be treated as

data modulation whereby the envelope transition time will apply.

Note 5.

The varactor capacitance tuning range indicates the allowable external antenna component variation to maintain tune over normal production

tolerances of external components. Guaranteed by design not tested in production.

Note 6.

For the ASK modulation scheme, the part will accept ASK (digital ON/OFF) input and will transmit the data with a finite extinction ratio and the

pin will set the MARK power level.

Note 7.

When the device is first powered up or it loses power momentarily, it goes into the calibration mode to tune up the transmit antenna.

Test Circuit

PC

VDD

VSS

REFOSC

ASK

MICRF103

ANTM

ANTP

STBY

100

Ω

4:1

680pF

7.1nH

680pF

200

Ω

100

Ω

50

Ω