MT88E46 Ver la hoja de datos (PDF) - Zarlink Semiconductor Inc
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MT88E46 Datasheet PDF : 23 Pages
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MT88E46
Data Sheet
TIP
RING
Tx+
TIP Telephone
Hybrid or
Speech IC
(Symbolic)
RING
Tx-
Rx+
Rx-
Microphone
Speaker
R5
R6
C1 R1 D1
R3
D2
D3
C2 R2
= To Microcontroller
= From Microcontroller
R7
R4
D4
Vss Xtal
(FSK Interface Mode 1 selected)
VREF
IN2+
IN1+
IN2-
MT88E46
IN1-
GS2
GS1
CB2
Vss
CB1
OSC1
Vdd
OSC2
CD
CB0
NC
R13 is required only if both FSK
R13
interface mode 0 and power down
features are used.
DCLK
DATA
IC
DR/DET
Unless stated otherwise, resistors are 1%, 0.1Watt; capacitors are 5%, 6.3V.
For 1000Vrms, 60Hz isolation from Tip to Earth and Ring to Earth:
R1,R2
430K, 0.5W, 5%, 475V minimum
C1,C2
(e.g. IRC type GS-3)
2n2, 1332V minimum
R11
R10
R8 C3
R12
R9 C4
± 10% power
supply
C5
C5 should be connected
directly across the Vdd
and Vss pins.
If the 1000Vrms is handled by other methods then this circuit has to meet the FCC Part 68 Type B Ringer requirements:
R1,R2
432K, 0.1W, 1%, 56V minimum
C1,C2 2n2, 212V minimum
Common to both sets of R1,R2 and C1,C2:
R3,R4
34K
R8, R9
464K
R13
100K, 20%. Required only if both FSK interface mode 0 and power down features are used.
C3,C4
2n2
C5
100n, 20%
D1-D4
Diodes. 1N4148 or equivalent
Xtal
3.579545MHz, 0.1% crystal
Vdd =
GS1 Gain
R5
R6
R7
5V±10%
0dB
53K6
60K4
464K
3V±10%
-4.0dB (preliminary)
34K0
38K3
294K
Vdd =
GS2 Gain
R10
R11
R12
5V±10%
0dB
53K6
60K4
464K
3V±10%
-4.0dB (preliminary)
34K0
38K3
294K
In a telephone adjunct box application where there is no hybrid or speech IC, if the GS2 gain with respect to Tip/Ring is to be set to the same as
GS1, the GS2 op-amp can be connected as a voltage follower to the GS1 output as shown in Figure 5.
Figure 8 - Application Circuit: MEI Compatible Type 2 Telephone
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