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參數(shù)資料
| 型號(hào)： | UCB1300BE |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | Advanced modem/audio analog front-end |
| 中文描述： | MODEM-SUPPORT CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-313-2, LQFP-48 |
| 文件頁數(shù)： | 35/56頁 |
| 文件大?。?/td> | 1022K |
| 代理商： | UCB1300BE |
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1999 Jul 20
35
Philips Semiconductors
Preliminary specification
Advanced modem/audio analog front-end
UCB1300
APPLICATION INFORMATION
In this chapter some application information is contained. More information will be available when an Application Note
on UCB1300 is published.
Sidetone suppression circuit
An important built-in feature of the telecom codec is the sidetone suppression circuit. The sidetone suppression circuit is
activated when TEL_SIDE_ENA in the telecom control register B is set. The telecom input signal contains a large part
of the telecom output signal, 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 Fig.30, has a fixed subtraction ratio, set be the resistors R
s
and R
i
,
which equals 600/456. This ratio is calculated from the following relations.
The impedance seen by the telephone line equals:
R
,
in which Rt represents winding resistance of the transformer, divided by 2. Assuming Ri >> Ro then
R
line
R
t
R
t
R
o
600 2
300
=
=
+
+
=
Fig.30 Typical telecom codec sidetone suppression circuit (without protection circuits).
-
+
Rs
TOUTP
TINP
11
15
Ri
Rg
R
Rt
-
+
Rs
TOUTN
TINN
12
14
Ri
Rg
R
Rt
Rt
Rt
1:1 transformer
A
B
UCB1300
Z
line
2
R
t
R
t
R
i
R
×
+
R
+
+
×
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCB1400 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Audio codec with touch screen controller and power management monitor |
| UCB1400BE | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Audio codec with touch screen controller and power management monitor |
| UCB1400BE,128 | 功能描述:接口—CODEC AUDIO CODEC WITH TOUCHSCREEN RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| UCB1400BE,151 | 功能描述:接口—CODEC AUDIO CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| UCB1400BE,157 | 功能描述:接口—CODEC DO NOT USE ORDER -S OR -T PART RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
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