參數(shù)資料
型號(hào)： MT8885AN
廠商： Mitel Networks Corporation
英文描述： Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
中文描述： 綜合DTMFTransceiver與掉電
文件頁(yè)數(shù)： 8/20頁(yè)
文件大?。?/td> 350K
代理商： MT8885AN
MT8885
Advance Information
4-58
Table 2. Actual Frequencies Versus Standard
Requirements
Distortion Calculations
The MT8885 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 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 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 10.
Equation 2. THD (%) For a Dual Tone
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
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
DTMF Clock Circuit
The internal clock circuit is completed with the
addition of a standard television colour burst crystal
having a resonant frequency of 3.579545 MHz. A
number of MT8885 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 TTL buffer with the
OSC2 outputs left unconnected.
Figure 11 - Common Crystal Connection
Microprocessor Interface
The MT8885 design incorporates an adaptive
interface, which allows it to be connected to various
kinds of microprocessors. Key functions of this
interface include the following:
Continuous activity on DS/RD is not necessary
to update the internal status registers.
senses whether input timing is that of an Intel or
Motorola controller by monitoring the
DS (RD),
R/W (WR) and CS inputs.
generates equivalent CS signal for internal
operation for all processors.
differentiates between multiplexed and non-
multiplexed microprocessor buses. Address
and data are latched in accordingly.
compatible with Motorola and Intel processors.
Figure 16 shows the timing diagram for Motorola
microprocessors with separate address and data
buses. Members of this microprocessor family
include 2 MHz versions of the MC6800, MC6802 and
MC6809. For the MC6809, the chip select (CS) input
signal is formed by NANDing the (E+Q) clocks and
address decode output. For the MC6800 and
MC6802, CS is formed by NANDing VMA and
address decode output. On the falling edge of CS,
the internal logic senses the state of data strobe
MT8885
OSC1
OSC2
MT8885
OSC1
OSC2
MT8885
OSC1
OSC2
3.579545 MHz
相關(guān)PDF資料
PDF描述
MT8885AP Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT8885AN1 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24SSOP - Rail/Tube
MT8885ANR 制造商:Microsemi Corporation 功能描述:
MT8885ANR1 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24SSOP - Tape and Reel
MT8885AP 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24PDIP - Rail/Tube
MT8888 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Intel Micro Interface
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