MT88E46 데이터 시트보기 (PDF) - Zarlink Semiconductor Inc
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MT88E46 Datasheet PDF : 23 Pages
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MT88E46
Change Summary
Changes from March 2000 Issue to November 2006 Issue.
Page Item
1
Change
Updated Ordering Information.
Data Sheet
VREF
IN1+
IN1-
GS1
Vss
OSC1
OSC2
CB0
DCLK
DATA
1
20
2
19
3
18
4
17
5 MT88E46 16
6
15
7
14
8
13
9
12
10
11
IN2+
IN2-
GS2
CB2
CB1
Vdd
CD
NC
IC
DR/DET
Pin Description
Figure 2 - Pin Connections
Pin #
1
2
3
4
5
6
7
8
Name
VREF
IN1+
IN1-
GS1
Vss
OSC1
OSC2
CB0
Description
Voltage Reference (Output). Nominally Vdd/2. It is used to bias the GS1 (Tip/Ring connection) and
GS2 (telephone hybrid or speech IC receive pair connection) input op-amps.
GS1 Op-Amp Non-inverting Input. The op-amp is for connecting the MT88E46 to Tip/Ring.
GS1 Op-Amp Inverting Input. The op-amp is for connecting the MT88E46 to Tip/Ring.
Gain Select 1 (Output). This is the output of the GS1 op-amp. The op-amp should be used to connect the
MT88E46 to Tip and Ring. The Tip/Ring signal can be amplified or attenuated at GS1 via selection of the
feedback resistor between GS1 and IN1-.
FSK demodulation or ‘on hook mode’ CAS detection of the GS1 signal can be selected via the CB1 and
CB2 pins. See Tables 1 and 2.
Power Supply Ground.
Oscillator Input. Crystal connection. This pin can also be driven directly from an external clock source.
Oscillator Output. Crystal connection. When OSC1 is driven by an external clock, this pin should be left
open circuit.
Control Bit 0 (CMOS Logic Input). This pin is used primarily to select the 3-wire FSK data interface
mode. When it is low, interface mode 0 is selected where the FSK bit stream is output directly at the
DATA pin. When it is high, interface mode 1 is selected where the FSK byte is stored in a 1 byte buffer
which can be read serially by the application’s microcontroller.
The FSK interface is consisted of the DATA, DCLK and DR/DET pins. See the 3 pin descriptions to
understand how CB0 affects the FSK interface.
This pin is also used with CB1 and CB2 to put the MT88E46 into a power down state drawing virtually
no power supply current. See Tables 1 and 2.
2
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