參數(shù)資料
型號: MT88E45BS
廠商: ZARLINK SEMICONDUCTOR INC
元件分類: 無繩電話/電話
英文描述: 4-Wire Calling Number Identification Circuit 2
中文描述: TELEPHONE CALLING NO IDENT CKT, PDSO20
封裝: 0.300 INCH, SOIC-20
文件頁數(shù): 12/28頁
文件大小: 488K
代理商: MT88E45BS
MT88E45B
Data Sheet
12
Application Circuits
Figure 7 - Application Circuit: Bellcore MEI Compatible Type 2 Telephone
V
REF
IN1+
IN1-
GS1
Vss
OSC1
DCLK
DATA
IN2+
IN2-
GS2
CB2
CB1
Vdd
CD
ST/GT
MT88E45B
OSC2
CB0
EST
DR/STD
Telephone
Hybrid
or
Speech IC
(Symbolic)
Tx+
Tx-
Rx+
Rx-
TIP
RING
Microphone
Speaker
TIP
RING
R1
R2
R3
R4
R5
R6
D1
D2
D3
D4
R7
R8
R9
R10
R11
R12
R13
R14
D5
C1
C2
C3
C4
Xtal
R15
C5
C6
(FSK Interface Mode 1 selected)
R15 is required only if both FSK
interface mode 0 and power
down features are used.
C6 should be
connected directly
across Vdd and Vss
pins
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
(e.g. IRC type GS-3)
2n2, 1332V min.
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%
5V, 0dB gain
53K6
60K4
464K
3V, -3.5dB gain
35K7
40K2
309K
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
Vdd
= To Microcontroller
= From Microcontroller
Vss
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