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參數(shù)資料
| 型號(hào)： | NT95089 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Tone Dialer |
| 中文描述： | 撥號(hào)音 |
| 文件頁(yè)數(shù)： | 1/11頁(yè) |
| 文件大?。?/td> | 309K |
| 代理商： | NT95089 |
NT95089
Tone Dialer
1
Features
Wide operating voltage range: 2.5V - 10V
Optimum use with a constant operating supply voltage
(typically 3.5V )
Tone amplitude stability of
±
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
TV crystal standard (3.58MHz) is used to derive all
frequencies, providing high accuracy and stability
Specifically
designed
applications
Interfaces directly with a standard push-button
telephone keyboard with common terminal
Dual tone/single tone capability
for
electronic
telephone
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.
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
The
NT95089
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
specifications.
telephone
industry
Pin Configuration
Keyboard Assignments
1
2
3
A
R1
4
5
6
B
R2
7
8
9
C
R3
*
0
#
D
R4
C1
C2
C3
C4
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