- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄381306 > AS1747-BTDT (AUSTRIAMICROSYSTEMS AG) Neg. Signal Audio Switch PDF資料下載
參數(shù)資料
| 型號： | AS1747-BTDT |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 數(shù)據(jù)轉(zhuǎn)換 |
| 英文描述： | Neg. Signal Audio Switch |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 514K |
| 代理商： | AS1747-BTDT |
10 - 16
AS1747, AS1748, AS1749, AS1750
Datasheet - Detailed Description
8 Detailed Description
The AS1747– AS1750 are operating from a +1.8V to +5.5V supply and feature a negative signal capability that allows
signals below ground to pass through without distortion. A break-before-make switching and a low on-resistance are
also included in this analog dual SPDT switches. The device is fully specified for a 3.0V application.
A headphone or mute detection is included in the AS1748 and AS1750. This function is realized with a comparator
which has an internally generated thresh-hold of about 1/3 of V
CC
. To reduce click-and-pop sounds when switching
between precharged points the AS1749 and AS1750 have an internal shunt switch. This shunt switch automatically
discharges any capacitance at the NO and NC connection points.
9 Application Information
Digital Control Inputs
The logic inputs of the AS1747– AS1750
accept up to +5.5V independent of the supply voltage. Due to this a mixing of
the logic levels in a system is possible. For example, with a +3.3V supply, IN_ can be driven low to GND and high to
+5.5V. For a +1.8V supply voltage, the logic levels are 0.5V (low) and 1.4V (high); for a +5V supply voltage, the logic
levels are 0.8V (low) and 2.0V (high).
Analog Signal Levels
The change of the on-resistance of the AS1747– AS1750 is very little for analog input signals over the whole supply
voltage range. The switches are bi-directional, so the NO_, NC_, and COM_ pins can be either inputs or outputs.
The AS1747– AS1750 pass signals as low as V
CC
- 5.5V, including signals below ground with minimal distortion.
Comparator (AS1748
1
/AS1750)
To implement a mute and headphone function, a comparator is included in the AS1748 and AS1750. The negative ter-
minal of this comparator is connected to the outside (via pin CMP-) while the positive terminal is internally set to V
CC
/3.
The output of the comparator (CMPO) is logic high when the negative terminal (CMP-) is below the threshold. CMPO is
logic low when CMP- is higher than V
CC
/3.
Headphone audio signals are typical biased to V
CC
/2 so a comparator threshold of V
CC
/3 is sufficient for the head-
phone detection.
Shunt Switch (AS1749
1
/AS1750)
Due to the switching between audio sources, audible click-and-pop sounds occur. To reduce this sounds a 100
Ω
shunt
switch is implemented in the AS1749 and AS1750. This shunt switch automatically discharges any capacitance at the
NC_ or NO_ terminals when they are unconnected to COM_.
Audible clicks and pops are caused when a step DC voltage is switched into the speaker. By automatically discharging
the side that is not connected, any residual DC voltage is removed, thereby reducing the clicks and pops.
Power-Supply Sequencing and Overvoltage Protection
Caution:
Stresses beyond the listed absolute maximum ratings in
Table 3 on page 4
may cause permanent damage
to the device. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.
Proper power-supply sequencing is recommended for all CMOS devices. Always apply V
CC
before applying analog
signals, especially if the analog signal is not current-limited.
1. on request
相關PDF資料 |
PDF描述 |
|---|---|
| AS1751S-T | Quad 0.9Ω SPST Switch; Package Type: TSSOP-14 |
| AS1751V-T | Quad 0.9Ω SPST Switch; Package Type: TQFN(3x3)-16 |
| AS1752S-T | Quad 0.9Ω SPST Switch; Package Type: TSSOP-14 |
| AS1752V-T | Quad 0.9Ω SPST Switch; Package Type: TQFN(3x3)-16 |
| AS1753S-T | Quad 0.9Ω SPST Switch; Package Type: TSSOP-14 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AS1747BTDT1K | 制造商:ams 功能描述:T&R / TDFN 3x3 10 |
| AS1747-BTDT-1K | 功能描述:IC SWITCH DUAL SPDT 10TDFN RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關，多路復用器，多路分解器 系列:- 標準包裝:2,500 系列:- 功能:視頻交叉點開關 電路:1 x 8:6 導通狀態(tài)電阻:- 電壓電源:單電源 電壓 - 電源，單路/雙路(±):3.135 V ~ 5.25 V 電流 - 電源:55mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:24-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:24-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:1214 (CN2011-ZH PDF) 其它名稱:FMS6502MTC24XTR |
| AS1747-BWLT | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability |
| AS1748 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability |
| AS1748-BQFR | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability |
發(fā)布緊急采購，3分鐘左右您將得到回復。