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參數(shù)資料
| 型號： | AS2521 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 英文描述： | Telephone Speech Circuit with Loudhearing and Handsfree |
| 中文描述： | 電話語音電路Loudhearing和免提 |
| 文件頁數(shù)： | 2/14頁 |
| 文件大?。?/td> | 96K |
| 代理商： | AS2521 |
Preliminary
AS2520/21/20B/21B
Rev. 5.1
Page 2
May 1999
Pin Description
Pin #
Name
Type
Description
1
LS
AI
Line Current Sense Input
This input is used for sensing the line current.
Complex Impedance Input
Input pin for the capacitor in the complex impedance.
Receive Output
This is the output for driving a dynamic earpiece with an impedance of 140
to 300 ohm.
Positive Voltage Supply
This is the supply pin for the circuit.
Analogue Ground
This pin is the analogue ground for the amplifiers.
Side Tone Balance Input
This is the input for the side tone cancellation network.
Line Loss Compensation Selection Pin
LLC = V
DD
:
High range
-6 dB from 45 mA to 75 mA;
LLC = A
GND
: Low range
-6 dB from 20 mA to 50 mA;
LLC = V
SS
: No regulation
gain independent of line current;
2
CI
AI
3
RO
AO
4
V
DD
Supply
5
A
GND
Supply
6
STB
AI
7
LLC
DI
8
LSI
AO
Loudspeaker Amplifier Input
This is the input for applying the receive signal to the loudspeaker
amplifier.
Tone Input
This switchable input is intended for transmitting DTMF or other signals
like messages on TAMs (Telephone Answering Machines) onto the line in
off-hook conditions and when in ringing mode to apply a PDM signal to the
loudspeaker (see also table 1).
Receive Threshold Input
The sensibility of the receive peak detector can be adjusted by applying
the signal from RO to the RTH input through a voltage divider.
Converter Make Output
This is an output for controlling the external switching converter. It
converts the ring signal into a 4V supply voltage and is activated when PD
= high and HS, LE, MT = low.
Loudspeaker Power Supply
High power supply for the output driver stage.
Output for Loudspeaker
Output pin for an ac coupled 32
(25 to 50
)loudspeaker.
Negative High Power Supply
This pin is the negative high power supply for the loudspeaker amplifier.
Mute Input
Dialling mute input (see also table 1).
MT = V
DD
: Tx and Rx channels muted;
MT = V
SS
: Tx and Rx channels not muted.
Power Down Input
Input for powering down the speech circuit and loudhearing/handsfree
(see table 1).
Loudhearing Enable Input
Input for enabling loudhearing/handsfree, active high (see table 1).
Handset Switch Input
This is an input that is pulled high by the hook switch (handset) or μC
when off-hook (see table 1).
9
TI
AI
DI
10
RTH
AI
11
CM
AO
12
V
PP
Supply
13
LO
AO
14
V
SSP
Supply
15
MT
DI
16
PD
DI
17
LE
DI
18
HS
DI
相關PDF資料 |
PDF描述 |
|---|---|
| AS2520P | Telephone Speech Circuit with Loudhearing and Handsfree |
| AS2520 | Telephone Speech Circuit with Loudhearing and Handsfree |
| AS2520B | Telephone Speech Circuit with Loudhearing and Handsfree |
| AS2520T | Telephone Speech Circuit with Loudhearing and Handsfree |
| AS2521B | Telephone Speech Circuit with Loudhearing and Handsfree |
相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS2521B | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Telephone Speech Circuit with Loudhearing and Handsfree |
| AS2521BP | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Telephone Speech Circuit with Loudhearing and Handsfree |
| AS2521BT | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Telephone Speech Circuit with Loudhearing and Handsfree |
| AS2521P | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Telephone Speech Circuit with Loudhearing and Handsfree |
| AS2521T | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Telephone Speech Circuit with Loudhearing and Handsfree |
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