參數(shù)資料
型號(hào)： MT88L89
廠商： Mitel Networks Corporation
英文描述： 3V Integrated DTMF Transceiver with Adaptive Micro Interface(3V 集成雙音多頻信號(hào)（DTMF）接收器（帶自適應(yīng)微接口）)
中文描述： 3V的雙音多頻收發(fā)器集成自適應(yīng)微型接口（3V的集成雙音多頻信號(hào)（DTMF）的接收器（帶自適應(yīng)微接口））
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 210K
代理商： MT88L89
MT88L89
4-130
received. In applications where a non-standard
burst/pause time is desirable, a software timing loop
or external timer can be used to provide the timing
pulses when the burst mode is disabled by enabling
and disabling the transmitter.
Single Tone Generation
A single tone mode is available whereby individual
tones from the low group or high group can be
generated. This mode can be used for DTMF test
equipment
applications,
generation and distortion measurements. Refer to
Control Register B (CRB) description for details.
acknowledgment
tone
Table 2. Actual Frequencies Versus Standard
Requirements
Distortion Calculations
The MT88L89 is capable of producing precise tone
bursts with minimal error in frequency (see Table 2).
The internal summing amplifier is followed by a first-
order lowpass switched capacitor filter to minimize
harmonic components and intermodulation products.
The total harmonic distortion for a single tone can be
calculated by using Equation 1, which is the ratio of
the total power of all the extraneous frequencies to
the power of the fundamental frequency expressed
as a percentage.
Equation 1. THD (%) For a Single Tone
The Fourier components of the tone output
correspond to V
2f
.... V
nf
as measured on the output
waveform. The total harmonic distortion for a dual
tone can be calculated by using Equation 2. V
L
and
V
H
correspond to the low group amplitude and high
group amplitude, respectively and V
2
IMD
is the sum
of all the intermodulation components. The internal
switched-capacitor filter following the D/A converter
keeps distortion products down to a very low level as
shown in Figure 9.
Equation 2. THD (%) For a Dual Tone
DTMF Clock Circuit
The internal clock circuit is completed with the
additions of a standard television colour burst
crystal. The crystal specification is as follows:
Frequency:
Frequency Tolerance:
Resonance Mode:
Load Capacitance:
Maximum Series Resistance:
Maximum Drive Level:
3.579545 MHz
±
0.1%
Parallel
18 pF
150 ohms
2 mW
e.g.CTS Knights MP036S
Toyocom TQC-203-A-9S
A number of MT88L89 devices can be connected as
shown in Figure 11 such that only one crystal is
required. Alternatively, the OSC1 inputs on all
devices can be driven from a CMOS buffer with the
OSC2 outputs left unconnected.
Figure 11 - Common Crystal Connection
Microprocessor Interface
The MT88L89 design incorporates an adaptive
interface, which allows it to be connected to various
kinds of microprocessors. Key functions of this
interface include the following:
ACTIVE
INPUT
OUTPUT FREQUENCY (Hz)
%ERROR
SPECIFIED
697
770
852
941
1209
1336
1477
1633
ACTUAL
699.1
766.2
847.4
948.0
1215.9
1331.7
1471.9
1645.0
L1
+0.30
-0.49
-0.54
+0.74
+0.57
-0.32
-0.35
+0.73
L2
L3
L4
H1
H2
H3
H4
THD (%) = 100
V
2
fundamental
V
2
2f
+ V
2
3f
+ V
2
4f
+ .... V
2
nf
V
2L
+
V
2H
V
22L
+
V
23L
+ ....
V
2nL
+
V
22H
+
V
23H
+ ..
V
2nH
+
V
2IMD
THD (%) = 100
MT88L89
OSC1
OSC2
MT88L89
OSC1
OSC2
MT88L89
OSC1
OSC2
3.579545 MHz
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參數(shù)描述
MT88L89AC 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:3V Integrated DTMFTransceiver with Adaptive Micro Interface
MT88L89AE 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:3V Integrated DTMFTransceiver with Adaptive Micro Interface
MT88L89AN 制造商:Microsemi Corporation 功能描述:
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