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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)： | 9/27頁 |
| 文件大?。?/td> | 623K |
| 代理商： | AN1500A |
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AN1500A
sames
9/27
To accommodate easy and uncomplicated redialing behind a PABX, a
sliding cursor
protocol is implemented:
if a manually entered digit string matches the contents of the LNR memory, pressing LNR will only dial out the
remaining digits :
example: desired number 0123456 (where 01 is the access code)
off-hook, manual entry =
01
-wait for dial tone
(LNR contents is 0123456)
-wait for dial tone
LNR dials out the remaining digits: 23456
-
23456
- line is busy
-on-hook
off-hook, manual entry =
01
- press
LNR
key:
The SA2532K is designed for applications requiring a characteristic impedance of 600 Ohms, no connection should
be made to CI (pin 7) if a real impedance is required. Should a complex impedance be required a capacitor of
approximately 1/10 of the complex part of the impedance should be connected to CI. Every complex impedance
consists of a real and complex part. The ac impedance of the SA2532K is calculated by
Z
AC
= Z
SYN
+ Z1
Where :
Z1 = the external resistor connected between pin 1(LS) and pin 27 (LI) . This resistor is also used by the device for
current monitoring and sets the DC resistance. To maintain correct operation the value of this resistor should be
set to 30 Ohm.
Z
SYN
= the internally synthezised impedance.
For real impedances
Z
SYN
= 19 * Z1
Z
AC
= (19*Z
SYN
) + Z1
Z
AC
= 20 * Z1 = 600 Ohm
If a impedance lower than Z
AC
is required, then a external parallel impedance should be added between LS and
V
SS
. To calculate the resulting AC impedance, any parallel impedance path between LS and V
SS
should be
considered. For example, if a bipolar line transistor is used, the resistance from the transistors base to VSS (Z
P
) is
in the order of 10K (R10). If a MOSFET is used then Z
P
is in the order of 100K which is negligible.
Z
AC
= 600//Z
P
Care must be taken when selecting the value of ZP since the value chosen should be such that the line transistor is
driven into full saturation.
11.1 Demo board measurements:
11.1.1 Definition:
return loss is defined as:
returnloss
Zref
Zref
Zx
Zx
=
+
20*log
where:
Zref = the reference AC impedance (= the line termination)
Zx = the AC impedance of the telephone under test
10 Sliding cursor protocol and pause insertion
11 AC impedance of the SA2532K
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