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參數(shù)資料
| 型號(hào)： | TP5088WM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 無(wú)繩電話/電話 |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | TELEPHONE DIALER CKT, PDSO14 |
| 封裝： | 0.300 INCH, PLASTIC, SO-14 |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大小： | 132K |
| 代理商： | TP5088WM |
Connection Diagram
Dual-In-Line Package
TL/H/5004–2
Top View
Order Number TP5088WM or TP5088N
See NS Package M14B or N14A
Functional Description
With the TONE ENABLE pin pulled low, the device is in a
low power idle mode, with the oscillator inhibited and the
output transistor turned off. Data on inputs D0–D3 is ig-
nored until a rising transition on TONE ENABLE. Data meet-
ing the timing specifications is latched in, the oscillator and
output stage are enabled, and tone generation begins. The
decoded data sets the high group and low group program-
mable counters to the appropriate divide ratios. These
counters sequence two ratioed-capacitor D/A converters
through a series of 28 equal duration steps per sine wave
cycle. On-chip regulators ensure good stability of tone am-
plitudes with variations in supply voltage and temperature.
The two tones are summed by a mixer amplifier, with pre-
emphasis applied to the high group tone. The output is an
NPN emitter-follower requiring the addition of an external
load resistor to V
SS
.
Table I shows the accuracies of the tone output frequencies
and Table II is the Functional Truth Table.
TABLE I. Output Frequency Accuracy
Tone
Group
Standard
DTMF (Hz)
Tone Output
Frequency
% Deviation
from Standard
Low
Group
f
L
697
770
852
941
694.8
770.1
852.4
940.0
b
0.32
a
0.02
a
0.03
b
0.11
High
Group
f
H
1209
1336
1477
1633
1206.0
1331.7
1486.5
1639.0
b
0.24
b
0.32
a
0.64
a
0.37
Pin Descriptions
V
DD
(Pin 1):
This is the positive supply to the device, refer-
enced to V
SS
. The collector of the TONE OUT transistor is
also connected to this pin.
V
SS
(Pin 5):
This is the negative voltage supply. All voltages
are referenced to this pin.
OSC IN, OSC OUT (Pins 6 and 7):
All tone generation tim-
ing is derived from the on-chip oscillator circuit. A low-cost
3.579545 MHz A-cut crystal (NTSC TV color-burst) is need-
ed between pins 6 and 7. Load capacitors and a feedback
resistor are included on-chip for good start-up and stability.
The oscillator is stopped when the TONE ENABLE input is
pulled to logic low.
TONE ENABLE Input (Pin 2):
This input has an internal
pull-up resistor. When TONE ENABLE is pulled to logic low,
the oscillator is inhibited and the tone generators and output
transistor are turned off. A low to high transition on TONE
ENABLE latches in data from D0–D3. The oscillator starts,
and tone generation continues until TONE ENABLE is
pulled low again.
MUTE (Pin 8):
This output is an open-drain N-channel de-
vice that sinks current to V
SS
when TONE ENABLE is low
and no tones are being generated. The device turns off
when TONE ENABLE is high.
D0, D1, D2, D3 (Pins 9, 10, 11, 12):
These are the inputs for
binary-coded data, which is latched in on the rising edge of
TONE ENABLE. Data must meet the timing specifications of
Figure 2. At all other times these inputs are ignored and may
be multiplexed with other system functions.
TONE OUT (Pin 14):
This output is the open emitter of an
NPN transistor, the collector of which is connected internal-
ly to V
DD
. When an external load resistor is connected from
TONE OUT to V
SS
, the output voltage on this pin is the sum
of the high and low group tones superimposed on a DC
offset. When not generating tones, this output transistor is
turned off to minimize the device idle current.
SINGLE TONE ENABLE (Pin 3):
This input has an internal
pull-up resistor. When pulled to V
SS
, the device is in single
tone mode and only a single tone will be generated at pin 14
(for testing purposes). For normal operation, leave this pin
open-circuit or pull to V
DD
.
GROUP SELECT (Pin 4):
This pin is used to select the high
group or low group frequency when the device is in single
tone mode. It has an internal pull-up resistor. Leaving this
pin open-circuit or pulling it to V
DD
will generate the high
group, while pulling to V
SS
will generate the low group fre-
quency at the TONE OUT pin.
3
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相關(guān)代理商/技術(shù)參數(shù) |
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| TP5089 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:TP5089 DTMF (TOUCH-TONE) Generator |
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| TP5089WM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone Telephone Dialer |
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