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M-8888-01P bảng dữ liệu(PDF) 4 Page - Clare, Inc.

tên linh kiện M-8888-01P
Giải thích chi tiết về linh kiện  DTMF Transceiver
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nhà sản xuất  CLARE [Clare, Inc.]
Trang chủ  http://www.clare.com
Logo CLARE - Clare, Inc.

M-8888-01P bảng dữ liệu(HTML) 4 Page - Clare, Inc.

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M-8888
Rev. 1
The value of t
DP is a device parameter and tREC is the
minimum signal duration to be recognized by the
receiver. A value for C1 of 0.1
µF is recommended for
most applications, leaving R1 to be selected by the
designer. Different steering arrangements may be
used to select independently the guard times for tone
present (t
GTP) and tone absent (tGTA). This may be nec-
essary to meet system specifications that place both
accept and reject limits on both tone duration and inter-
digit pause. Guard time adjustment also allows the
designer to tailor system parameters such as talkoff
and noise immunity. Increasing t
REC improves talkoff
performance since it reduces the probability that tones
simulated by speech will maintain signal condition long
enough to be registered. Alternatively, a relatively short
t
REC with a long tDO would be appropriate for extreme-
ly noisy environments where fast acquisition time and
immunity to tone dropouts are required. Design infor-
mation for guard time adjustment is shown in the
Guard Time Adjustment above.
Call Progress Filter
A call progress (CP) mode can be selected, allowing
the detection of various tones that identify the progress
of a telephone call on the network. The call progress
tone input and DTMF input are common; however, call
progress tones can only be detected when the CP
mode has been selected. DTMF signals cannot be
detected if the CP mode has been selected (see the
Actual Frequencies vs Standard Requirements on
page 5). The Call Progress Response above indicates
the useful detect bandwidth of the call progress filter.
Frequencies presented to the input (IN+ and IN-) that
are within the accept bandwidth limits of the filter are
hard-limited by a high-gain comparator with the
IRQ/CP pin serving as the output. The square wave
output obtained from the schmitt trigger can be ana-
yzed by a microprocessor or counter arrangement to
determine the nature of the call progress tone being
detected. Frequencies in the reject area will not be
detected, and consequently there will be no activity on
IRQ/CP as a result of these frequencies.
DTMF Generator
The DTMF transmitter used in the M-8888 is capable
of generating all 16 standard DTMF tone pairs with low
distortion and high accuracy. All frequencies are
derived from an external 3.58 MHz crystal. The sinu-
soidal waveforms for the individual tones are digitally
synthesized using row and column programmable
dividers and switched capacitor digital-to-analog con-
verters. The row and column tones are mixed and fil-
tered, providing a DTMF signal with low total harmonic
distortion and high accuracy. To specify a DTMF sig-
nal, data conforming to the encoding format shown in
the Tone Encoding/Decoding Table on page 3 must be
written to the transmit data register. Note that this is the
same as the receiver output code. The individual tones
that are generated (f
LOW and fHIGH) are referred to as
low-group and high-group tones. Typically, the high-
group to low-group amplitude ratio (twist) is 2 dB to
compensate for high-group attenuation on long loops.
Operation:
During write operations to the transmit data register, 4-
bit data on the bus is latched and converted to a 2 of 8
code for use by the programmable divider circuitry to
specify a time segment length that will ultimately deter-
mine the tone frequency. The number of time seg-
ments is fixed at 32, but the frequency is varied by
varying the segment length. When the divider reaches
the appropriate count as determined by the input code,
a reset pulse is issued and the counter starts again.
Guard Time Adjustment
Call Progress Response


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