Micrel, Inc.

MICRF002/RF022

July 2008

3

M9999-070808

Pin Description

Pin Number

SOIC-16

Pin Number

SOIC-8

Pin Name

Pin Name

1

–

SEL0

Bandwidth Selection Bit 0 (Digital Input): Used in conjunction with SEL1 to set

the desired demodulator filter bandwidth. See Table 1. Internally pulled-up to

VDDRF.

2, 3

1

VSSRF

RF Power Supply: Ground return to the RF section power supply.

4

2

ANT

Antenna (Analog Input): For optimal performance the ANT pin should be

impedance matched to the antenna. See “Applications Information” for

information on input impedance and matching techniques.

5

3

VDDRF

RF Power Supply: Positive supply input for the RF section of the IC.

6

–

VDDBB

Base-Band Power Supply: Positive supply input for the baseband section

(digital section) of the IC.

7

4

CTH

Data Slicing Threshold Capacitor (Analog I/O): Capacitor connected to this

pin extracts the dc average value from the demodulated waveform which

becomes the reference for the internal data slicing comparator.

8

–

NC

Not internally connected

9

–

VSSBB

Base-Band Power Supply: Ground return to the baseband section power

supply.

10

5

DO

Data Output (Digital Output)

11

6

SHUT

Shutdown (Digital Input): Shutdown-mode logic-level control input. Pull low to

enable the receiver. Internally pulled-up to VDDRF.

12

–

WAKEB

Wakeup (Digital Output): Active-low output that indicates detection of an

incoming RF signal.

13

7

CAGC

Automatic Gain Control (Analog I/O): Connect an external capacitor to set the

attack/decay rate of the on-chip automatic gain control.

14

–

SEL1

Bandwidth Selection Bit 1 (Digital Input): Used in conjunction with SEL0 to set

the desired demodulator filter bandwidth. See Table 1. Internally pulled-up to

VDDRF.

15

8

REFOSC

Reference Oscillator: Timing reference, sets the RF receive frequency.

16

–

SWEN

Sweep-Mode Enable (Digital Input): Sweep- or Fixed-mode operation control

input. SWEN high= sweep mode; SWEN low = conventional superheterodyne

receiver. Internally pulled-up to VDDRF.