MC3371D Datasheet

IC型号：
MC3371D
PDF描述：
Single Radio Communication IF Amplifier
文件大小：
359.75KB
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MC3371 MC3372

An external positive bias to Pin 12 sets up the squelch

trigger circuit such that the audio mute (Pin 14) is open or

connected to ground. If Pin 12 is pulled down to 0.9 V or

below by the noise or tone detector, Pin 14 is internally

shorted to ground. There is about 57 mV of hyteresis at

Pin 12 to prevent jitter. Audio muting is accomplished by

connecting Pin 14 to the appropriate point in the audio path

between Pin 9 and an audio amplifier. The voltage at Pin 14

should not be lower than 鈥?.7 V; this can be assured by

connecting Pin 14 to the point that has no dc component.

Another possible application of the squelch switch may

be as a carrier level triggered squelch circuit, similar to the

MC3362/MC3363 FM receivers. In this case the meter

output can be used directly to trigger the squelch switch

when the RF input at the input frequency falls below the

desired level. The level at which this occurs is determined

by the resistor placed between the meter drive output

(Pin 13) and ground (Pin 15).

Figure 11. Typical Application for MC3371 at 10.7 MHz

VCC = 4.0 Vdc

RSSI Output

10 k

1st IF 10.7 MHz

from Input

Front End

4.7

碌F

TKANS9443HM

6.8

碌H 卤6%

100 k

1.0 k

1N5817 R5

4.7 k R6

0.1

0.001

510 k

Filter 鈥?/div>

Amp

Limiter

Amp

51 k

Oscillator

C10

10.245

MHz

C11

220

muRata

CFU455D2

equivalent

C12

0.1

C13

0.1

R10

39 k

C14

0.1

T2: Toko

2A6597 HK (10 mm)

7MC鈥?128Z (7 mm)

5 1.8 k 6

Amp

560

4.7 k

3.3 k

0.022

VR2

10 k

0.22

AF Out

to Audio

Power Amp

VR1 (Squelch Control)

10 k

C15

8.2

碌H

R11

560

0.01

51 k

C17

0.1

Squelch Trigger

with Hysteresis

Mixer

Demodulator

53 k

MOTOROLA ANALOG IC DEVICE DATA

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