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AS2525 Datasheet(PDF) 2 Page - ams AG

Part # AS2525
Description  Single-Chip Handsfree Phone CMOS Integrated Circuit
PDF  26 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS2525 Datasheet(HTML) 2 Page - ams AG

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Preliminary
AS2525
Rev. 1.3
Page 2
May 1999
Pin Description
Pin #
Symbol
Type
Description
1
CS2
DO
Chip Select 2
Chip select signal for external LCD driver circuit or 2 mA LED
If signal is not activated, a pull down resistor ( 100 k
Ω ) is inserted.
2
DPn
DO
Dial Pulse Output
Digital output which holds the line during off-hook operation or pulls low during
break periods of pulse dialling and flash.
3
HF
DI
HandsFree Switch Input
This is an Schmitt-trigger input that is pulled high to enable handsfree
operation.
4
HS
DI
HandSet Switch Input
This is an Schmitt-trigger input that is pulled high by the hook switch to enable
handset or headset operation.
5
FT1
AI
Analogue input pin for connecting a capacitor for offset cancellation.
6
FT2
AI
Analogue input pin for connecting a capacitor for offset cancellation.
7
M4
AI
Microphone Input 4
Differential input for the handsfree microphone (electret).
8
M2
AI
Microphone Input 2
Differential input for the handset microphone (electret).
9
M3
AI
Microphone Input 3
Differential input for the handsfree microphone (electret).
10
M1
AI
Microphone Input 1
Differential input for the handset microphone (electret).
11
STB
AI
Side Tone Balance Input
Analogue input for side tone cancellation network.
12
CS
AO
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.
13
V
SS
Supply
Voltage Source Source
Negative Power Supply.
14
LI
AI
Line Input
Analogue input used for power extraction and line current sensing.
15
RI
AI
Receive Input
Analogue input for ac-separated receive signal.
16
SS
AO
Supply Source Control Output
N-channel open drain output to control the external high power source
transistor for supplying (Vpp) the loudspeaker amplifier in off-hook
loudspeaking/handsfree mode.
17
LS
AI
Line Current Sense Input
Analogue input for sensing the line current.



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