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參數(shù)資料
| 型號： | AS2525 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Single-Chip Handsfree Phone CMOS Integrated Circuit |
| 中文描述： | TELEPHONE MULTIFUNCTION CKT, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 264K |
| 代理商： | AS2525 |
Preliminary
AS2525
Rev. 1.3
Page 9
May 1999
Functional Description
DC Conditions
The normal operating mode is from 15 mA to 100 mA.
An operating mode with reduced performance is from
5 mA to 15 mA. In the line-hold range from 0 mA to 5
mA the device is in a power down mode.
The dc characteristic is determined by the voltage at
LI pin and a 30
resistor between pin LI and LS. It
can be calculated by the following equation:
V
LS
= V
LI
+ I
LINE
30
V
LI
can be programmed to be 3.5 V or 4.5 V.
Table 7: DC mask selection
[PG] + [0] + (Password) + [#] + [3] + (digit) + [PG]
Digit
DC Mask (dc voltage at pin LI)
[0]
Low dc mask, V
LI
= 3.5 Volt
[1]
High dc mask, V
LI
= 4.5 Volt
100
80
60
40
ILine
20
0
0
2
4
6
8
VLine
VLS
VLI
(V)
(mA)
Figure 7: DC characteristic with low dc mask
2/4 Wire Conversion
AS2525 has a built-in dual Wheatstone bridge with
one common ground. This provides a maximum of
independence of ac impedance and side-tone from
each other. One can adapt side-tone without changing
the ac impedance.
AC Impedance
The ac impedance of AS2525 is set to 1000
. A
complex impedance can be adjusted by connecting an
external capacitor to the CI pin. With an external
resistor of approximately 1.5 k
connected to the LS
pin, it can be programmed to 600
.
Z
AC(syn)
= 33
30
Side-Tone
A good side-tone cancellation can be achieved by
using the following equation:
Z
BAL
/Z
LINE
= 10
This is assuming that the side-tone reference resistor,
R2 (between LI and STB) is 300
and R1 is 30
.
Z
LINE
R1 = 30 ohm
R2 = 300 ohm
Z
BAL
Figure 8: Side-tone balance
Transmit Path
The gain of the M1/M2 —> LS path is default set to
37 dB. This gain can be changed from 30 dB to 45 dB
in 1 dB steps by set-up programming.
Table 8: Handset Tx gain setting
[PG] + [0] + (Password) + [0] + [1] + (x) + [PG]
Key
(x)
Tx Gain (dB)
M1/2 to LS
Key
(x)
Tx Gain (dB)
M1/2 to LS
[0]
[1]
[2)
[3]
[4]
[5]
[6]
[7]
30
31
32
33
34
35
36
37
[8]
[9]
[M1]
[M2]
[M3]
[M4]
[M5]
[M6]
38
39
40
41
42
43
44
45
The input is differential with an impedance of 10 k
.
The soft clip circuit limits the output voltage swing at
pin LS to 2 V
PEAK
when activated.
Table 9: Handset Tx soft clipping selection
[PG] + [0] + (Password) + [#] + [4] + (digit) + [PG]
Digit
Handset Tx Soft Clipping
[0]
Disabled
[1]
Enabled
(2 V
PEAK
)
There is optional LLC for this path.
The gain of the M3/M4 —> LS path is default set to
46 dB. This gain can be changed from 39 dB to 54 dB
in 1 dB steps by set-up programming.
相關PDF資料 |
PDF描述 |
|---|---|
| AS2534ET | Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping |
| AS2535 | Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping |
| AS2535P | Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping |
| AS2535T | Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping |
| AS2536 | Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AS2525 DB | 功能描述:AS2525 - Telecom Evaluation Board 制造商:ams 系列:- 零件狀態(tài):停產(chǎn) 主要用途:電信 嵌入式:- 使用的 IC/零件:AS2525 主要屬性:- 輔助屬性:- 所含物品:板 標準包裝:1 |
| AS2525_1 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Single-Chip Handsfree Phone CMOS Integrated Circuit |
| AS2525B | 功能描述:電信線路管理 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| AS2525B-T | 功能描述:IC HANDSFREE TELEPH CMOS 44-TQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:* 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1,000 系列:- 濾波器類型:連續(xù)時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) |
| AS2525-DB | 制造商:AMS 功能描述:BOARD DEMO FOR AS2525 制造商:ams 功能描述:AS2525 Demo Board |
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