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參數(shù)資料
| 型號： | MT8880CP-1 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | ISO2-CMOS Integrated DTMFTransceiver |
| 中文描述： | ISO2 - CMOS集成DTMFTransceiver |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 312K |
| 代理商： | MT8880CP-1 |
MT8880C/MT8880C-1
ISO
2
-CMOS
4-40
Equation 1. THD (%) For a Single Tone
Equation 2. THD (%) For a Dual Tone
Table 1. Actual Frequencies Versus Standard
Requirements
using Equation 2. V
L
and V
H
correspond to the low
group
amplitude
and
respectively, and V
2IMD
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.
high
group
amplitude,
DTMF Clock Circuit
The internal clock circuit is completed with the
addition of a standard television colour burst crystal.
The crystal specification is as follows:
Frequency:
Frequency Tolerance:
Resonance Mode:
Load Capacitance:
3.579545 MHz
±
0.1%
Parallel
18pF
ACTIVE
INPUT
OUTPUT FREQUENCY
(Hz)
%ERROR
SPECIFIED
ACTUAL
L1
697
699.1
+0.30
L2
770
766.2
-0.49
L3
852
847.4
-0.54
L4
941
948.0
+0.74
H1
1209
1215.9
+0.57
H2
1336
1331.7
-0.32
H3
1477
1471.9
-0.35
H4
1633
1645.0
+0.73
THD(%) =
100
V
fundamental
V
22f
+ V
23f
+ V
24f
+ .... V
2nf
V
2L
+ V
2H
V
22L
+ V
23L
+ .... V
2nL
+ V
22H
+
V
23H
+ .. V
2nH
+ V
2IMD
THD (%) = 100
Maximum Series Resistance:150 ohms
Maximum Drive Level:
2mW
e.g.
CTS Knights MP036S
Toyocom TQC-203-A-9S
A number of MT8880C/C-1 devices can be
connected as shown in Figure 12 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 12 - Common Crystal Connection
Microprocessor Interface
The MT8880C/C-1 employs a microprocessor
interface which allows precise control of transmitter
and receiver functions. There are five internal
registers
associated
with
interface which can be subdivided into three
categories, i.e., data transfer, transceiver control and
transceiver
status.
There
associated with data transfer operations.
the
microprocessor
are
two
registers
The Receive Data Register contains the output code
of the last valid DTMF tone pair to be decoded and is
a read only register. The data entered in the Transmit
Data Register will determine which tone pair is to be
generated (see Figure 7 for coding details). Data can
only be written to the transmit register. Transceiver
control is accomplished with two Control Registers
(CRA and CRB) which occupy the same address
space. A write operation to CRB can be executed by
setting the appropriate bit in CRA. The following
write operation to the same address will then be
directed to CRB and subsequent write cycles will
then be directed back to CRA. A software reset must
be included at the beginning of all programs to
initialize the control and status registers after power
up or power reset (see Figure 16). Refer to Tables 3,
4, 5 and 6 for details concerning the Control
Registers. The IRQ/CP pin can be programmed such
that it will provide an interrupt request signal upon
validation of DTMF signals or when the transmitter is
ready for more data (Burst mode only). The IRQ/CP
pin is configured as an open drain output device and
as such requires a pull-up resistor (see Figure 13).
MT8880C/C-1
OSC1
OSC2
MT8880C/C-1
OSC1
OSC2
MT8880C/C-1
OSC1
OSC2
3.579545 MHz
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8880CPR | 制造商:Microsemi Corporation 功能描述: 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 28PLCC - Tape and Reel |
| MT8880CPR1 | 制造商:Microsemi Corporation 功能描述:PB FREE INTEGRATED DTMF TRANSCEIVER 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 28PLCC - Tape and Reel 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX DTMF 28PLCC 制造商:Microsemi Corporation 功能描述:IC TXRX DTMF 28PLCC |
| MT8880CS | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 20SOIC - Rail/Tube |
| MT8880CS/CS-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver |
| MT8880CS1 | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHz CMOS 5V 20-Pin SOIC Tube 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 20SOIC - Rail/Tube 制造商:Microsemi Corporation 功能描述:PB FREE DTMF TRANSCEIVER |
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