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NT95089

Tone Dialer

Features

T

Wide operating voltage range: 2.5V - 10V

T

Optimum use with a constant operating supply voltage

T

T

T

T

TV

T

T

T

(typically 3.5V )

Tone amplitude stability of

鹵1.5dB

within the

suggested operating temperature range

Device power may be derived directly from telephone

lines or from small batteries

Low total harmonic distortion

crystal standard (3.58MHz) is used to derive all

frequencies, providing high accuracy and stability

Specifically designed for electronic telephone

applications

Interfaces directly with a standard push-button

telephone keyboard with common terminal

Dual tone/single tone capability

General Description

The NT95089 DTMF generator is specifically designed

for applications requiring a fixed supply operating voltage

and a high stability tone output, making it ideal for

electronic telephone applications. The NT95089

interfaces directly to a standard push-button telephone

keyboard (common terminal connected to VSS) and

operates directly from telephone lines. All necessary

dual-tone frequencies are derived from the widely-used

TV crystal standard, providing high accuracy and

stability. The required sinusoidal waveform for individual

tones is digitally synthesized on the chip, resulting in a

waveform with low total harmonic distortion. A voltage

reference which is stable over the operating temperature

range is generated on the chip; this reference is used to

regulate the dual tone frequency levels to ensure that

they

meet

recommended

telephone

industry

specifications.

Pin Configuration

Keyboard Assignments

1

4

7

*

C1

2

5

8

0

C2

3

6

9

#

C3

A

B

C

D

C4

R1

R2

R3

R4

1

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