DataSheet26.com

AS2540 PDF даташит

Спецификация AS2540 изготовлена ​​​​«austriamicrosystems AG» и имеет функцию, называемую «Remote Controlled Single-Chip-Telephone».

Детали детали

Номер произв AS2540
Описание Remote Controlled Single-Chip-Telephone
Производители austriamicrosystems AG
логотип austriamicrosystems AG логотип 

18 Pages
scroll

No Preview Available !

AS2540 Даташит, Описание, Даташиты
Data Sheet AS2540
austriamicaursotrsiaymsitceromsysstems
Remote Controlled Single-Chip-Telephone
AS2540
DATA SHEET (PRELIMINARY)
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
- Web Telephones
- Answering Machines
- Fax Machines
- Base Station of Cordless Telephones
- Hospital Communication Units
Key Features
- 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
Package
- 28 pin SOIC
- Dice-on-Foil
Block Diagram
Line
Main Power Mode
LS
LI
RI -2dB
STB
CS
Mask
CI
DPn
DTMF-
generator
+ 6dB
+ 2d B
ROH
ROT
M1
M2
TIT
AGND
Line
Backup Mode
LS
LI
RI -2dB
STB
CS
Mask
CI
DPn
DTMF-
g enerator
+ 6dB
+ 2d B
ROH
ROT
M1
M2
TIT
AGND
C1
C2
C3
R1
R2
MODE
RFD
MO
EHS
MHS
DIALLER
UART
RxD
TxD
VDD
VSS
OSC
C1
C2
C3
R1
R2
MODE
DIALLER
RFD
MO
EHS
MHS
UART
RxD
TxD
VDD
VSS
OSC
Revision 3.1
Page 1 of 18









No Preview Available !

AS2540 Даташит, Описание, Даташиты
Data Sheet AS2540
austriamicrosystems
Pin Description
Pin #
15
7
5
6
2
3
8
16
17
18
19
28
11
4
Symbol
RFD
LS
LI
RI
STB
CS
CI
DPn
EHS
MHS
MODE
MO
VDD
VSS
Function
Ring Frequency Discrimination
Schmitt trigger input for ring frequency discrimination. Disabled during off-hook.
Line Current Sense Input
Input for sensing the line current
Line Input
Input used for power extraction and line current sensing
Receive Input
Input for ac-separated receive signal
Side Tone Balance Input
Input for side tone cancellation network
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
Complex Impedance Input
Input pin for the capacitor to program a complex impedance
Dial Pulse Output
Open drain output pulls low during break periods of pulse dialling and flash
Electronic Hook Switch
Schmitt Trigger Input to detect an electronic off-hook.
Manual Hook Switch
Schmitt Trigger Input to detect a manual off-hook.
DTMF Level Selection
-4/-6dBm
—>
-6/-8dBm
—>
-8/-10dBm
—>
DLS open
DLS-r1
DLS-r2
Line Loss Compensation Select Pin
45mA-75mA
—> LLC open
20mA-50mA
—> LLC-r3
None
—> LLC-r4
Ring Melody Output
PDM output of the ring melody generator.
Voltage Drain Drain
Positive Power Supply
Voltage Source Source
Negative Power Supply
Revision 3.1
Page 2 of 18









No Preview Available !

AS2540 Даташит, Описание, Даташиты
Data Sheet AS2540
austriamicrosystems
Pin #
25
12
26
27
20
21
22
23
24
10
1
9
13
14
Symbol
OSC
AGND
RXD
TXD
R1
R2
C1
C2
C3
ROT
TIT
ROH
M2
M1
Function
Oscillator Input
Input for ceramic resonator 3.58MHz.
Recommended type: Murata CSA 3.58MG312AM or compatible
Analogue Ground
Special ground for the internal amplifiers
Receive Data Input
Schmitt trigger input to serial interface
Transmit Data Output
Open drain output from serial interface
Keyboard Rows
Keyboard Columns
Receive Output to Transformer
Output for driving a transformer with an ac impedance larger than 10k
Transformer Input from Transformer
Single ended input for transformer
Receive Output to Handset
Output for driving a dynamic earpiece with an impedance from 150to 300
Microphone Inputs
Differential inputs for the microphone (electret)
Revision 3.1
Page 3 of 18










Скачать PDF:

[ AS2540.PDF Даташит ]

Номер в каталогеОписаниеПроизводители
AS2540Remote Controlled Single-Chip-Telephoneaustriamicrosystems AG
austriamicrosystems AG
AS2540-7R100 Watt DC-DC ConvertersPower-One
Power-One

Номер в каталоге Описание Производители
TL431

100 мА, регулируемый прецизионный шунтирующий регулятор

Unisonic Technologies
Unisonic Technologies
IRF840

8 А, 500 В, N-канальный МОП-транзистор

Vishay
Vishay
LM317

Линейный стабилизатор напряжения, 1,5 А

STMicroelectronics
STMicroelectronics

DataSheet26.com    |    2020    |

  Контакты    |    Поиск