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參數資料
| 型號： | PCD3312CT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | DTMF/modem/musical-tone generators |
| 中文描述： | TELEPHONE MULTIFUNCTION CKT, PDSO8 |
| 封裝： | PLASTIC, SOT176-1, SOP-8 |
| 文件頁數： | 6/28頁 |
| 文件大小： | 176K |
| 代理商： | PCD3312CT |
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1996 Nov 21
6
Philips Semiconductors
Product specification
DTMF/modem/musical-tone generators
PCD3311C; PCD3312C
7
FUNCTIONAL DESCRIPTION
7.1
General
(see Fig.1)
The Input Control Logic decodes the input data to
determine whether DTMF, modem or musical tones are
selected; and which particular tone or combination of
tones is required.
A code representing the required tones is sent to the
Divider Selection ROM which selects the correct division
ratio in both of the Frequency Dividers (or in one divider, if
only a single tone is required).
The Oscillator circuit provides a square wave of frequency
3.58 MHz. Each Frequency Divider divides the frequency
of the Oscillator to give a serial digital square wave with a
frequency simply related to that of the required tone.
The output from each Frequency Divider goes to a DAC,
which is also fed by a clock derived from the oscillator.
Using these two signals, the DAC produces an
approximate sine wave of the required frequency, with an
amplitude derived from the Voltage Reference.
The output from the DAC goes to an Adder where, for
DTMF, it is combined with the output from the other DAC.
The output from the Adder goes through two stages of Low
Pass Filters to give a smoothed tone (single or dual), and
finally to the TONE output.
7.2
Clock/oscillator connection
The timebase for the PCD3311C and PCD3312C is a
crystal-controlled oscillator, requiring a 3.58 MHz quartz
crystal to be connected between OSCI and OSCO.
Alternatively, the OSCI input can be driven from an
external clock of 3.58 MHz.
7.3
Mode selection (PCD3311C)
The MODE input selects the data input mode for the
PCD3311C. When MODE is connected to V
DD
(HIGH),
data can be received in the parallel mode. When
connected to V
SS
(LOW) or left open, data can be received
via the serial I
2
C-bus.
PCD 3312C has no MODE input as data input is via the
I
2
C-bus only.
7.4
Data inputs (PCD3311C)
Inputs D0, D1, D2, D3, D4 and D5 are used in the parallel
data input mode of the PCD3311C. Inputs D0 and D1 are
also used in serial input mode when they act as the SCL
and SDA inputs respectively. Inputs D0 and D1 have no
internal pull-down or pull-up resistors and must not be left
open in any application. Inputs D2, D3, D4 and D5 have
internal pull-down.
D4 and D5 are used to select between DTMF dual, DTMF
single, modem and musical tones (see Table 1). D0, D1,
D2 and D3 select the tone combination or single tone
within the selected application. They also, in combination
with D4, select the standby mode. See Tables 2, 3, 4
and 5.
PCD 3312C has no parallel data pins as data input is via
the I
2
C-bus.
Table 1
Use of D5 and D4 to select application
7.5
Strobe input (PCD3311C )
The STROBE input (with internal pull-down) allows the
loading of parallel data into D0 to D5 when MODE is HIGH.
The data inputs must be stable preceding the
positive-going edge of the strobe pulse (active HIGH).
Input data are loaded at the negative-going edge of the
strobe pulse and then the corresponding tone (or standby
mode) is provided at the TONE output. The output remains
unchanged until the negative-going edge of the next
STROBE pulse (for new data) is received. Figure 5 is an
example of the timing relationship between STROBE and
the data inputs.
When MODE is LOW, data is received serially via the
I
2
C-bus.
D5
D4
APPLICATION
LOW
LOW DTMF single tones; musical tones;
standby
LOW HIGH DTMF dual tones (all 16 combinations)
HIGH LOW modem tones
HIGH HIGH musical tones
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