MICRF008

Micrel

MICRF008

2

July 2003

Pin Description

Pin Number

Pin Name

Pin Function

1

SEL0

Bandwidth Selection Bit 0 (Input): Sets the desired demodulator filter

bandwidth. See Table 1. Internally pulled-up to V

2

ANT

Antenna (Input): High-impedance, internally AC-coupled receiver input.

Connect this pin to the matching network. See

optional band-pass filter information.

3

VDD

Positive Supply Input: Connect a low ESL, low ESR decoupling capacitor

from this pin to V

4

CTH

[Data Slicing] Threshold Capacitor (External Component): Capacitor

extracts the DC average value from the demodulated waveform which

becomes the reference for the internal data slicing comparator. See

“Appli-

5

DO

Digital Output (Output): CMOS-level compatible data output signal.

6

VSS

Negative Supply Input: Connect this pin to the RF ground.

7

CAGC

AGC Capacitor (External Component): Integrating capacitor for on-chip

AGC (automatic gain control). The decay/attack time-constant (

τ) ratio is

nominally 10:1. See

8

REFOSC

Reference Oscillator (External Component or Input): Timing reference for

on-chip tuning and alignment. Connect either a ceramic resonator or a

crystal between this pin and V

0.5V

Pin Configuration

1

SEL0

ANT

VDD

CTH

8

REFOSC

CAGC

VSS

DO

7

6

5

2

3

4

8-Pin SOP (M)