MICRF103

Micrel

MICRF103

2

June 2002

Pin Description

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

Refer-

ence 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.

Pin Configuration

1

PC

VDD

VSS

REFOSC

8

ASK

ANTP

ANTM

STBY

7

6

5

2

3

4

MICRF103BM