MT88E45B Просмотр технического описания (PDF) - Zarlink Semiconductor Inc

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MT88E45B

4-Wire Calling Number Identification Circuit 2 (4-Wire CNIC2)

Zarlink Semiconductor Inc 

MT88E45B

Application Circuits

Data Sheet

TIP

RING

Tx+

TIP Telephone Tx-

Hybrid

or

Speech IC

(Symbolic)

RING

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)

R15 is required only if both FSK R15

interface mode 0 and power

down features are used.

MT88E45B

VREF

IN2+

IN1+

IN2-

IN1-

GS2

GS1

CB2

Vss

CB1

OSC1

Vdd

OSC2

CD

CB0

ST/GT

DCLK

EST

DATA

DR/STD

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 min. C1,C2 2n2, 1332V min.

(e.g. IRC type GS-3)

R11

R10

R8 C3

R12

R9 C4

Vdd

C5 C6

R13

R14

D5

C6 should be

connected directly

across 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 min. C1,C2 2n2, 212V min.

Common to both sets of R1,R2:

R3,R4

34K

R8,R9

464K

R13

825K

R14

226K or 26K1

R15

100K, 20%

C3,C4

C5

C6

D1-D4

D5

Xtal

2n2

100n

100n, 20%

Diodes. 1N4148 or equivalent

Diode. 1N4148 or equivalent

3.579545MHz, 0.1% crystal

or ceramic resonator

R5,R10

R6,R11

R7,R12

5V, 0dB gain

53K6

60K4

464K

3V, -3.5dB gain

35K7

40K2

309K

Figure 7 - Application Circuit: Bellcore MEI Compatible Type 2 Telephone

12

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