- 您現在的位置：買賣IC網 > PDF目錄382720 > UCB1200BE (NXP SEMICONDUCTORS) Advanced modem/audio analog front-end PDF資料下載
參數資料
| 型號： | UCB1200BE |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 調制器/解調器 |
| 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： | 34/54頁 |
| 文件大小： | 1052K |
| 代理商： | UCB1200BE |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁當前第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁
1998 Jul 22
34
Philips Semiconductors
Product specification
Advanced modem/audio analog front-end
UCB1200
APPLICATION INFORMATION
In this chapter some application information is contained. More information will be available when an Application Note
on UCB1200 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
UCB1200
Z
line
2
R
t
R
t
R
i
R
×
+
R
+
+
×
=
相關PDF資料 |
PDF描述 |
|---|---|
| UCB1300 | Advanced modem/audio analog front-end |
| UCB1300BE | Advanced modem/audio analog front-end |
| UCB1400BE | Audio codec with touch screen controller and power management monitor |
| UCB1400 | Audio codec with touch screen controller and power management monitor |
| UCB1500 | PCI to AC97 bridge/host controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| UCB1300 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| UCB1300BE | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| 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: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
發布緊急采購，3分鐘左右您將得到回復。