參數(shù)資料
型號(hào)： MT8885
廠商： Mitel Networks Corporation
英文描述： Integrated DTMF Transceiver with Power Down and Adaptive Micro Interface(雙音多頻信號(hào)（DTMF）收發(fā)器（帶電源關(guān)閉和自適應(yīng)微接口）)
中文描述： 集成雙音多頻收發(fā)器的斷電和自適應(yīng)微型接口（雙音多頻信號(hào)（DTMF）的收發(fā)器（帶電源關(guān)閉和自適應(yīng)微接口））
文件頁(yè)數(shù)： 2/25頁(yè)
文件大?。?/td> 190K
代理商： MT8885
MT8885
Preliminary Information
4-52
Figure 2 - Pin Connections
Pin Description
Pin #
Name
Description
24
28
1
2
3
1
2
4
IN+
IN-
GS
Non-inverting
op-amp input.
Inverting
op-amp input.
Gain Select
. Gives access to output of front end differential amplifier for connection of
feedback resistor.
Reference Voltage
output (V
DD
/2).
Ground (0V).
Oscillator
input. This pin can also be driven directly by an external clock.
Oscillator
output. A 3.579545 MHz crystal connected between OSC1 and OSC2 completes
the internal oscillator circuit. Leave open circuit when OSC1 is driven externally.
Output from internal DTMF transmitter.
13 R/W
(
WR
)
(Motorola)
Read/Write
or (Intel)
Write
microprocessor input. CMOS compatible.
14
CS
Chip Select
input must be gated externally by either address strobe (AS), valid memory
address (VMA) or address latch enable (ALE) signal, depending on processor used. See
Figure 12. Must not be tied low. CMOS compatible.
15
RS0
Register Select
input. Refer to Table 3 for bit interpretation. CMOS compatible.
17
DS
(
RD) (Motorola)
Data Strobe
or (Intel)
Read
microprocessor input. Activity on this input is only
required when the device is being accessed. CMOS compatible.
18
IRQ/CP
Interrupt Request/Call Progress
(open drain) output. In interrupt mode, this output goes
low when a valid DTMF tone burst has been transmitted or received. In call progress mode,
this pin will output a rectangular signal representative of the input signal applied at the input
op-amp. The input signal must be within the bandwidth limits of the call progress filter, see
Figure 8.
19
PWDN
power-down
(input). Active High. Powers down the device and inhibits the oscillator. IRQ
and TONE output are high impedance. Data bus is held in tri-state. This pin has no internal
pulldown resistor. Therefore, must be tied to logic low when not used.
21-
24
(Intel). TTL compatible.
26
ESt
Early Steering
output. Presents a logic high once the digital algorithm has detected a valid
tone pair (signal condition). Any momentary loss of signal condition will cause ESt to return
to a logic low.
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.
4
5
6
7
6
7
8
9
V
Ref
V
SS
OSC1
OSC2
10
11
12
12
TONE
13
14
15
16
18-
21
22
D0-D3
Microprocessor data bus. High impedance when CS = 1 or DS =0 (Motorola) or RD = 1
23
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
24
23
22
21
20
19
18
17
IN+
IN-
GS
VRef
VSS
OSC1
OSC2
TONE
R/W/WR
CS
VDD
St/GT
ESt
D3
D2
D1
D0
NC
PWDN
IRQ/CP
DS/RD
RS0
24 PIN DIP/SSOP
2
4
3
2
1
2
2
5
6
7
8
9
10
11
25
24
23
22
21
20
19
1
1
1
1
1
1
1
NC
NC
VRef
VSS
OSC1
OSC2
NC
G
N
I
I
V
S
E
D3
D2
D1
D0
NC
PWDN
NC
T
R
28 PIN PLCC
C
R
N
D
I
相關(guān)PDF資料
PDF描述
MT8888CE-1 Integrated DTMFTransceiver with Intel Micro Interface
MT8888CN-1 CB 3C 3#16S SKT RECP WALL
MT8888CS-1 Integrated DTMFTransceiver with Intel Micro Interface
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT8885AE 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
MT8885AE1 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24PDIP - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX DTMF 20PDIP 制造商:Microsemi Corporation 功能描述:IC TXRX DTMF 20PDIP
MT8885AN 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24SSOP - Rail/Tube
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:
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