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Page 4 of 19

Issue A

LANSDALE Semiconductor, Inc.

ML3371, ML3372

15

22

0.33

0.001

57.6575

MHz

Oscillator

C15

0.1

Ceramic

Resonator

muRata

CFU455D2

or

equivalent

14

C1

0.01

51

51 k

RF Input

VCC = 4.0 Vdc

13

24

38

–

5

6

7

1

15

+

16

Mute

0.1

12

11

10

9

FilterOut

1.0 µF

Demodulator

AF

Amp

RSSI Output

510 k

SqIn

FilterIn

470

8.2 k

0.01

AF Out

to Audio

Power Amp

53 k

Limiter

Amp

Filter

Amp

Mixer

Squelch Trigger

with Hysteresis

C14

27

R10

1.8 k

R11

51 k

C12

0.1

C13

0.1

R12

4.3 k

muRata

CDB455C16

Figure 2. ML3372 Functional Block Diagram and Test Fixture Schematic

1.0 µF

10