MC13145FTA Ver la hoja de datos (PDF) - LANSDALE Semiconductor Inc.

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componentes Descripción

Fabricante

MC13145FTA

UHF Wideband Receiver Subsystem (LNA, Mixer, VCO, rescaler, IF Subsystem, Coiless Detector)

LANSDALE Semiconductor Inc. 

ML13145

LANSDALE Semiconductor, Inc.

Pin

47

2

1, 48

3

4

5

6

Symbol/Type

BWadj

Fadj

VEE

AFT Out

AFT In

Det Gain

Det Out

See Figure 3.

PIN FUNCTION DESCRIPTION

Description

Description

COILLESS DETECTOR

Bandwidth Adjust

The deviation bandwidth of the detector response is

determined by the combination of an on–chip

capacitor and an external resistor to ground.

Frequency Adjust

The free running frequency of the detector

oscillator is defined by the combination of an

on–chip capacitor and an external resistor, Radj

from frequency adjust pin to ground.

VEE, Negative Supply

These pins are VEE supply for the coilless detector

circuit.

AFT Out

The AFT is low pass filtered with a corner frequency

below the audio bandwidth allowing the error to be

added to the center frequency adjust signal at Fadj,

Pin 2. The low frequency high pass corner is set by

the external capacitor, Ct from AFT out (Pin 3) to

AFT in (Pin 4) and external resistor, Rt from AFT

out to Fadj (Pin 2).

AFT In

The AFT in is used to set the buffer transfer

function.

Detector Gain

The AFT buffer is used to set the buffer transfer

function.

Detector Output

Set gain and output level of detector with resistor to

Det Out Pin.

Figure 3. Coilless Detector Internal Circuit

Phase

Detector

i

ICO

IF

Vref1

BWadj 47

Rb

2Ib

Vref2

Fadj 2 Rt

Rf

2I

i

V CC

4

A*i

AFT In

Ct

3

AFT Out

Current Amplifier

V CC

A*i

5

6

RI

Det Out

V EE

48, 1

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