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參數(shù)資料
| 型號(hào)： | UCB1100LP |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Advanced modem/audio analog front-end |
| 中文描述： | 先進(jìn)的調(diào)制解調(diào)器/音頻模擬前端 |
| 文件頁數(shù)： | 13/36頁 |
| 文件大小： | 290K |
| 代理商： | UCB1100LP |
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Philips Semiconductors
Preliminary specification
UCB1100
Advanced modem/audio analog front-end
1998 May 08
13
Rg
Rg
Rs
Rs
Ri
Ri
toutn
tinn
tinp
toutp
Rt
Rt
Rt
Rt
Ro
Ro
1:1 transformer
A
B
SN00135
Figure 10.
Shown with the Typical Connection between UCB1100 and
Telephone Line (No Protections Circuits Shown)
Telecom codec Sidetone Suppression Circuitry
An important built in feature of the telecom codec is the sidetone
suppression circuit. The sidetone suppression circuit is activated
when the sidetone suppression enablebit in the telecom control
register B is set. The telecom input signal contains a large part of
the telecom output signal Tout, when the sidetone suppression
circuit is disabled. The available dynamic range of the telecom input
is occupied largely by the telecom output voltage.
The sidetone suppression circuit subtracts a part of the telecom
output signal from the telecom input signal when activated. The
available dynamic range is in that case used more effectively than
without sidetone suppression.
The built in side tone suppression circuit, shown in Figure 9, has a
fixed subtraction ratio, set be the resistors Rs and Ri, which equals
600 / 456. This ratio is calculated from the following relations:
The impedance seen by the telephone line equals:
Rline
2 * Rt
Rt
Ro* Ri
Ro
Ri
In which Rt represents winding resistance of the transformer, divided
by 2. Assuming Ri >> Ro then
Rline
Rt
Rt
Ro
600
2
300
A typical transformer has 156 ohm winding impedance, thus Re
should be 144 ohm. The ratio of the telecom input and output
voltage is therefore
Tin
Tout*
156
300
156
300
144
Tout*600
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCB1100LP/X3 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| UCB-12 | 功能描述:斷路器 CIRCUIT BREAKER RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Device Circuit Breakers 產(chǎn)品類型:Thermomagnetic 電流額定值:2 A 電壓額定值 AC:240 V, 277 V 電壓額定值 DC:50 V 極數(shù):1 Pole 執(zhí)行器類型:Slide 電路功能:Trip Free 系列:CB TM1 工作溫度范圍:- 30 C to + 60 C 照明:No |
| UCB1200 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| UCB1200B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UCB1200B |
| UCB1200BE | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
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