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參數(shù)資料
| 型號： | AS2540-ZSOW |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Remote controlled Basic Phone; Package Type: SOIC-28; Temperature Range: -15 - +60 °C; Output Interface: 2-Wire Serial; Supply Voltage: 3,60-5,00 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大?。?/td> | 248K |
| 代理商： | AS2540-ZSOW |
Data Sheet AS2540
Revision 3.1
Page 1 of 18
austria
micro
systems
General Description
The AS2540 is a CMOS integrated circuit that
incorporates a speech circuit (line-adaptation, 2/4-wire
conversion, separate Rx- and Tx-amplifiers for handset
and modem), MF dialler, ring frequency detector, ring
melody generator and a two wire serial interface. It
shall act as an a/b-line-powered device in order to
interface a main-powered CPU to the analogue
telephone line.
AS2540 can operate in a so-called mainpower mode
and in a backup mode. During mainpower mode, a
watchdog timer is running on AS2540, which has to be
reset via the serial interface, which is connected to the
CPU through opto-couplers. During backup mode (=
The main-power failure or SW engine problem),
AS2540 can operate as an independent basic MF
dialler (digits 0-9*#)
Applications
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Web Telephones
Answering Machines
Fax Machines
Base Station of Cordless Telephones
Hospital Communication Units
Key Features
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Line Interface, Speech Circuit, MF Dialler and Tone Ringer
on a 28 pin CMOS chip
Programmable via 2-wire serial interface
(UART 9600 baud, 8N1)
Watch dog timer for Backup Mode
Additional input for modem transmit path
Additional output for modem receive path
CMOS for high EMC immunity
Low Noise (max. –72 dBm)
Operating range from 15mA to 100mA (down to 5mA with
reduced performance)
Soft clipping for handset operation to avoid harsh distortion
Line loss compensation selectable by pin option
Real and complex impedance selectable by external
components
Side tone adaption selectable by external components
Ring frequency discrimination
3-tone ring melody generator
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Package
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28 pin SOIC
Dice-on-Foil
Block Diagram
LS
LI
ROH
ROT
M1
M2
TT
AGND
Lne
RI
STB
CS
CI
DPn
C1
C2
C3
R1
R2
MODE
RFD
-2dB
+ 6dB
+ 2dB
Mask
DTMF-
generator
DIALLER
UART
S
S
S
S
D
D
S
S
MO
RxD
TxD
VDD
EHS
MHS
VSS
OSC
Main Power Mode
LS
LI
ROH
ROT
M1
M2
TT
AGND
Line
RI
STB
CS
CI
DPn
C1
C2
C3
R1
R2
MODE
RFD
-2dB
+ 6dB
+ 2dB
Mask
DTMF-
generator
DIALLER
UART
S
S
S
S
D
D
S
S
MO
RxD
TxD
VDD
EHS
MHS
VSS
OSC
Backup Mode
Remote Controlled Single-Chip-Telephone
AS2540
DATA SHEET (PRELIMINARY)
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