XE1218AS000BF Просмотр технического описания (PDF) - Unspecified

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XE1218AS000BF

Low power single die FM receiver

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Datasheet XE1218A: Low

Power single die FM receiver

5. Input – output signal description

Pin Name

LOP

LON

XP

XN

RFI

RFG

RFT

VCCR

VDD

VSS

VCCA

VM

VCCO

VOL

OUT

EAR

AUD

Description

Local oscillator tank

Local oscillator tank

Crystal oscillator

connection

Crystal oscillator

connection

RF signal input

(differential to RFG)

RF signal ground

(differential to RFI)

LNA tank circuit

Supply voltage to the

RF circuitry

Functionality

The integrated local oscillator is used to produce the

mixer frequency to down convert the incoming carrier

frequency. This local oscillator requires an external tank

circuit, which must be tuned to select the desired crystal

overtone.

The crystal is connected between pins XP and XN. An

inductance must be put in parallel.

Type

Analog I/O

Analog I/O

Analog I/O

Analog I/O

The incoming carrier frequency is fed to the LNA via a

differential input (RFI and RFG). For best results, an

external capacitive impedance matching circuit is

required.

The LNA has an external tank circuit to optimize its gain.

The resonance frequency of this tank circuit must be

adjusted to be the same as the incoming carrier

frequency

This is the supply voltage for the RF section of the

XE1218A. It must be clean and de-coupled properly.

Analog Input

Analog ground

Analog I/O

Analog supply

Supply voltage to the

digital circuitry

Ground reference

Supply voltage to the

analog circuitry

External capacitor for

voltage multiplier

Supply for audio

circuitry

Volume control

Line out

Earphone out

Audio out de-coupling

This is the supply voltage for the digital and control

circuitry of the XE1218A. It must be clean and de-

coupled properly.

This is the ground reference. VDD, VCCA and VCCR

are referenced to this pin.

This is the supply voltage for the analog section of the

XE1218A. It must be clean and de-coupled properly.

The XE1218A audio circuitry requires an internal

voltage multiplier. This multiplier requires and external

capacitor to be connected to VM

This pin must be connected to VDD

This is used when the integrated PA is in use. An

external potentiometer (100kΩ to 1MΩ) will allow

varying the volume at the EAR output. 100kΩ will give

you a tuning range of 0dB to –10dB and 1MΩ will

equate to 0dB to –21.5dB

High impedance audio output: impedance = 10kΩ

Earphone output, average 250mV, ±3dB, speaker

impedance must be between 200Ω and 1kΩ

This pin is only used when the line out (OUT) is

selected. An additional de-coupling capacitor is needed

for line out best performance

Digital supply

Digital ground

Analog supply

Analog I/O

Supply input

Analog input

Analog output

Analog output

Analog output

9

D0204-157

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