參數(shù)資料
型號(hào): SC88E43
廠商: Electronic Theatre Controls, Inc.
英文描述: EXTENDED VOLTAGE CALLING NUMBER IDENTIFICATION CIRCUIT 2
中文描述: 更廣的電壓主叫號(hào)碼識(shí)別電路2
文件頁(yè)數(shù): 16/25頁(yè)
文件大小: 389K
代理商: SC88E43
Silan
Semiconductors
SC88E43
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
16
VRef and CAP Inputs
V
Ref
is the output of a low impedance voltage source equal to V
DD
/2 and is used to bias the input opamp. A
0.1mF capacitor is required between CAP and V
SS
to eliminate noise on V
Ref.
SC88E43
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
IN+
IN-
GS
Vref
CAP
V
SS
MODE
St/GT
ESt
StD
DATA
DCLK
FSKen
PWDN
IC
V
DD
INT
OSCout
OSCin
TRIGin
CD
DR
TRIGRC
TRIGout
V
DD
499K 5%
1N914 x 4
100nF 5%
499K 5%
100nF 5%
2
301K
5%
22nF
5%
22nF
5%
1N4003
1N4003
1N4003
1N4003
R1
R1
TIP /A
RING / B
V
DD
V
DD
V
DD
1
220nF
100nF
TISP
4180
R4
R4
464K
4
5
6
R3
1N914
R2
V
DD
V
DD
100nF
100K
20%
C
Note:Resistors must have 1% tolerance and capacitors have 20% tolerance unless otherwise specified.
Crystal is 3.579545MHz, 0.1% frequency tolerance.
For BT Application C=0.1
F
5%, R3=422k
1%, R2=422k
1%.
For Applications where CAS speech immunity is required(e.g.CIDCW), C=0.1
F
5%, R3=825k
1%, R2=226k
1%.
R1=430k, R4=34k for VDD=5V
10% (See Figure 10)
R1=620k, R4=63k4 for VDD=3V
10% (See Figure 10)
Figure 9- Application Circuit
Application Circuits
The circuits shown in Figures 9 and 11 are application circuits for the SC88E43. As supply voltage (VDD ) is
decreased, the threshold of the device’s tone and FSK detectors will be reduced. Therefore, to meet the BT or
Bellcore tone reject level requirements the gain of the input opamp should be reduced according to the graph in
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