Tone Detector

4

MX105A PRELIMINARY INFORMATION

© 1997 MX•COM, INC.

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Doc.# 20480133.003

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2. Signal List

Pin No.

Pin No.

Name

Type

Description

DW/P

LH

1

1

INPUT AMP IN

input

AC couple to this input. Nominal input

impedance is 200 k

Ω.

2

3

INPUT AMP OUT

output

Nominal output impedance is 1 k

Ω.

3

5

R3

input

Detect filter resistor pin.

4

6

R2

input

PLL loop filter resistor pin. For improved

performance C4 may be chosen to provide 30°

of phase shift at the loop filter input.

57

output

Detect filter capacitor pin A

68

output

Detect filter capacitor pin B

710

output

Loop filter capacitor pin A

811

output

Loop filter capacitor pin B

9

13

DETECT OUT

output

PMOS open drain output - active on detect.

10

14

power

Ground.

11

16

input

Bandwidth control resistor pin A

12

17

input

Bandwidth control resistor pin B

13

19

output

VCO capacitor B

14

20

output

VCO capacitor A

15

22

R1

input

VCO discharge resistor. When potentiometer

tuning is required, a series resistor is

recommend to prevent possible shorting to

ground.

16

24

power

Power supply.