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參數(shù)資料
| 型號： | AN1500A |
| 廠商： | SAMES |
| 英文描述： | SINGLE CHIP TELEPHONE DEMO BOARD |
| 中文描述： | 單芯片電話演示板 |
| 文件頁數(shù)： | 20/27頁 |
| 文件大小： | 623K |
| 代理商： | AN1500A |
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AN1500A
sames
20/27
16.8 DC-mask for various hook transistor arrangements
Fig. 9 shows a typical DC
mask graph for the optional
hook
arrangements: MOSFET with
overcurrent
MOSFET
with
protection, single PNP and
PNP darlington .
The
X-scale
current in mA and the Y-
scale shows the voltage
across
the
terminals.
Check with your application’s
PTT require- ments to find
the arrangement that fits best
into the specification.
transistor
pro-tection,
surge
shows
line
a-
and
b-
(see also: pt 15.2.1: setting
for low DC mask)
Fig. 11: DC mask for various
hook transistor options
Q3 is used to shunt excess line current to V
SS
to maintain a constant voltage on LI (#27). It is also used for DTMF
line modulation and short circuits the speech part during pulse dialing
(ref. Fig.8)
.
The transistor must be capable of driving >100mA and have a typ. gain B >=100.
Q4 is used to switch the piezo ringer on and off, it can be any NPN single or darlington transistor capable of driving
100mA at 25V U
CE
.
recommended types:
Q3
Q4
BC327-16
BCX 51-16 (SMD)
BC547
BC517 (Darlington)
BCV27 (SMD- Darlington)
In on-hook state the circuit is supplied by a very small current to maintain retention of stored numbers and ringing
melody. The hook transistor is off and the HS pin (#10) is forced to zero by R8 and R9//Q2
B,E
. The IC is powered
down, only a very small current flows from line to maintain V
DD
and thus retention of stored memories and ringing
melody. The DC resistance of the application in this state is >5M
(= the value of R1).
2
3
4
5
6
7
8
9
0
5
10
15
20
25
30
35
40
45
50
I Line [mA]
U
MOSFET with surge protection
single PNP (2SA1210)
bipolar darlington
MOSFET with current protection
17 Shunt- and Ringer Transistors
18 On-hook conditions
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