ML3371 datasheet(6/19 Pages) LANSDALE

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Issue A

LANSDALE Semiconductor, Inc.

ML3371, ML3372

ML3371 PIN FUNCTION DESCRIPTION

OPERATING CONDITIONS VCC = 4.0 Vdc, RFIn = 100 µV, fmod = 1.0 kHz, fdev = 3.0 kHz. ML3371 at f RF = 10.7 MHz (see Figure 11).

Symbol

Internal Equivalent

Circuit

Description

Waveform

OSC1

VCC

15 k

The base of the Colpitts oscillator. Use

a high impedance and low capacitance

probe or a “sniffer” to view the wave–

form without altering the frequency.

Typical level is 450 mVpp.

OSC2

200

µA

OSC2

The emitter of the Colpitts oscillator.

Typical signal level is 200 mVpp. Note

that the signal is somewhat distorted

compared to that on Pin 1.

MXOut

MixerOut

VCC

15 k

Output of the Mixer. Riding on the

455 kHz is the RF carrier component.

The typical level is approximately

60 mVpp.

VCC

100

µA

1.5k

Supply Voltage –2.0 to 9.0 Vdc is the

operating range. VCC is decoupled to

ground.

IFIn

1.8 k

51 k

53 k

IFIn

DEC1

Input to the IF amplifier after passing

through the 455 kHz ceramic filter. The

signal is attenuated by the filter. The

typical level is approximately

50 mVpp.

DEC1

DEC2

µA

IF Decoupling. External 0.1

µF

capacitors connected to VCC.

Quad

Coil

VCC

Quad Coil

µA

Quadrature Tuning Coil. Composite

(not yet demodulated) 455 kHz IF

signal is present. The typical level is

500 mVpp.

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