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參數(shù)資料
| 型號： | AS2540-T |
| 廠商： | ams |
| 文件頁數(shù)： | 13/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TELEPHONE CMOS MULTIFU 28SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 系列： | * |
Data Sheet AS2540
austriamicrosystems
Revision 3.1
Page 2 of 18
Pin Description
Pin #
Symbol
Function
15
RFD
Ring Frequency Discrimination
Schmitt trigger input for ring frequency discrimination. Disabled during off-hook.
7LS
Line Current Sense Input
Input for sensing the line current
5LI
Line Input
Input used for power extraction and line current sensing
6RI
Receive Input
Input for ac-separated receive signal
2STB
Side Tone Balance Input
Input for side tone cancellation network
3CS
Current Shunt Control Output
N-channel open drain output to control the external high power shunt transistor for synthesising ac- and
dc- impedance, modulation of line voltage and shorting the line during make periods of pulse dialling
8CI
Complex Impedance Input
Input pin for the capacitor to program a complex impedance
16
DPn
Dial Pulse Output
Open drain output pulls low during break periods of pulse dialling and flash
17
EHS
Electronic Hook Switch
Schmitt Trigger Input to detect an electronic off-hook.
18
MHS
Manual Hook Switch
Schmitt Trigger Input to detect a manual off-hook.
19
MODE
DTMF Level Selection
-4/-6dBm
—> DLS open
-6/-8dBm
—> DLS-r1
-8/-10dBm
—> DLS-r2
Line Loss Compensation Select Pin
45mA-75mA
—> LLC open
20mA-50mA
—> LLC-r3
None
—> LLC-r4
28
MO
Ring
Melody Output
PDM output of the ring melody generator.
11
VDD
Voltage Drain Drain
Positive Power Supply
4
VSS
Voltage Source Source
Negative Power Supply
ams
AG
Technical
content
still
valid
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