ML13145_08 datasheet(6/17 Pages) LANSDALE

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LANSDALE Semiconductor, Inc.

ML13145

PIN FUNCTION DESCRIPTION

Symbol/Type

Description

BWadj

See Figure 3.

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.

Fadj

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.

1, 48

VEE

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.

Det Gain

Detector Gain

The AFT buffer is used to set the buffer transfer

function.

Det Out

Detector Output

Set gain and output level of detector with resistor to

Det Out Pin.

Figure 3. Coilless Detector Internal Circuit

Current Amplifier

Det Out

Phase

Detector

ICO

Fadj

BWadj

A * i

AFT In

AFT Out

2Ib

VCC

Vref2

Vref1

VEE

48, 1

VCC

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