MICRF008BM Просмотр технического описания (PDF) - Micrel

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производитель

MICRF008BM

QwikRadio™ Sweep-Mode Receiver

Micrel 

MICRF008

Pin Configuration

SEL0 1

ANT 2

VDD 3

CTH 4

8 REFOSC

7 CAGC

6 VSS

5 DO

8-Pin SOP (M)

Micrel

Pin Description

Pin Number

1

2

3

4

5

6

7

8

Pin Name

SEL0

ANT

VDD

CTH

DO

VSS

CAGC

REFOSC

Pin Function

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

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

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

Connect this pin to the matching network. See “Applications Information” for

optional band-pass filter information.

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

from this pin to VSS, as short as possible.

[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-

cations Information” for selection.

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

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

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 “Applications Information” for capacitor selection.

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 VSS, or drive the input with an AC-coupled

0.5VPP input clock.

MICRF008

2

July 2003

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