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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）） |
| 文件頁數(shù)： | 3/28頁 |
| 文件大?。?/td> | 210K |
| 代理商： | MT88L89 |
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MT88L89
4-125
Functional Description
The MT88L89 Integrated DTMF Transceiver consists
of a high performance DTMF receiver with an
internal gain setting amplifier and a DTMF generator,
which employs a burst counter to synthesize precise
tone bursts and pauses. A call progress mode can
be selected so that frequencies within the specified
passband can be detected. The adaptive micro
interface allows various microcontrollers to access
the MT88L89 internal registers.
Power-Down
The MT88L89 provides enhanced power-down
functionality to facilitate minimization of supply
current consumption. DTMF transmitter and receiver
circuit blocks can be independently powered down
via register control. When asserted, RxEN control bit
powers down all analog and digital circuitry
associated solely with the DTMF and Call Progress
receiver. The TOUT control bit is used to disable the
transmitter and put all circuitry associated only with
the DTMF transmitter in power-down mode. With the
TOUT control bit is set to zero, the TONE output pin
is held in a high impedance (floating) state. When
both transmitter and receiver circuits are powered
down, circuits utilized by both the DTMF transmitter
and receiver are also powered down. This power-
down control disables the crystal oscillator, and the
V
Ref
generator. In addition, the IRQ, TONE output
and DATA pins are held in a high impedance state.
Input Configuration
The input arrangement of the MT88L89 provides a
differential-input operational amplifier as well as a
bias source (V
Ref
), which is used to bias the inputs at
V
DD
/2. Provision is made for connection of a
feedback resistor to the op-amp output (GS) for gain
adjustment.
For applications which are required to meet a
guaranteed RX input level of -29dBm over the full
temperature and supply voltage range, a unity gain
input configuration as shown in Figures 3 and 4 can
be used.
For applications which require signal detection lower
than -29dBm, the external resistors can be
configured to give adequate gain. For example, if the
application requires tone detection of -31dBm, the
input gain can be set to +2dB with the external
resistors (see Figures 13 and 14 for value of
resistors). However, when +2dB gain is used, the
corresponding maximum input signal level must not
exceed -6dBm.
Receiver Section
Separation of the low and high group tones is
achieved by applying the DTMF signal to the inputs
of two sixth-order switched capacitor bandpass
filters, the bandwidths of which correspond to the low
and high group frequencies (see Table 1). The filters
also incorporate notches at 350 Hz and 440 Hz for
exceptional dial tone rejection. Each filter output is
followed by a single order switched capacitor filter
section, which smooths the signals prior to limiting.
Limiting is performed by high-gain comparators
which are provided with hysteresis to prevent
detection of unwanted low-level signals. The outputs
of the comparators provide full rail logic swings at the
frequencies of the incoming DTMF signals.
19
23
27
St/GT
Steering Input/Guard Time
output (bidirectional). A voltage greater than V
TSt
detected
at St causes the device to register the detected tone pair and update the output latch. A
voltage less than V
TSt
frees the device to accept a new tone pair. The GT output acts to
reset the external steering time-constant; its state is a function of ESt and the voltage
on St.
Positive power supply (3V typ.).
No Connection.
20
24
28
V
DD
NC
8,9
16,
17
3,5,
10-11
16
23-
25
Pin Description
Pin #
Name
Description
20
24
28
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相關(guān)代理商/技術(shù)參數(shù) |
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: |
| MT88L89AN1 | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 3V 24SSOP - Rail/Tube |
| MT88L89ANR1 | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 3V 24SSOP - Tape and Reel 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX DTMF 3V 24SSOP 制造商:Microsemi Corporation 功能描述:IC TXRX DTMF 3V 24SSOP |
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