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參數(shù)資料
| 型號： | U3762MB |
| 英文描述： | Stellaris Programming Services |
| 中文描述： | 通用電話芯片-所有的功能集成 |
| 文件頁數(shù)： | 6/23頁 |
| 文件大?。?/td> | 248K |
| 代理商： | U3762MB |
U3762MB
Rev. A1, 15-Sep-98
Preliminary Information
6 (23)
Configuration
Function
Symbol
Pin
19
V
I
This internal voltage bias line must be con-
nected to VL via an external resistor which
dominates the AC input impedance of the cir-
cuit and should be 680
for an 600- input
impedance or 1.2 k
for a 900-
input im-
pedance.
VI
ê
PD
16V
20
MUTE
Pin for testing
VBG
MUTE
ê
PD
MUTE
6.7V
30K
21
PRIND
PRIVACY indication pin
Open collector with minimum 1 mA drive
current to GND when PRIVACY = active
PRIND
VL
ê
ê
PD
6.7V
22
RECIN
Receive amplifier input. The receiving ampli-
fication is regulated by an AGC.
RECIN
60K
23
24
RECO2
RECO1
Output of the receive amplifier. Dynamic
transducers with a minimum impedance of
100 can be directly driven by these outputs.
RECO1
RECO2
VL
ê
ê
PD
60K
6.7V
ê
25
CLIM
Time constant of anticlipping in transmit path.
CLIM
2.2 F
CLIM = GND: anticlipping inactive
VL
CLIM
IDC
PD
6V
ê
26
ST
The output of the sidetone cancellation signal,
which requires a balanced impedance of 8 to
10 times the subscribers line impedance to be
connected to Pin VL.
Ringer threshold adjustment
ST
ê
PD
16V
27
THA
THA
VRIAC
1V
ê
ê
PD
6V
6V
12K
20K
140K
ê
28
AGC
The range of transmit and receive gain varia-
tions between short and long loops may be
adjusted by connecting a resistor R
AGC
from
this pin to (GND). This pin can be left open to
set AGC out of action.
RDC
AGC
VL
ê
PD
PD
29
VRIAC
Ringing supply
VRIAC
ê
êê
PD
50V
70K
10K
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