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參數(shù)資料
| 型號： | AS1747-BTDT-1K |
| 廠商： | ams |
| 文件頁數(shù)： | 3/17頁 |
| 文件大小： | 0K |
| 描述： | IC SWITCH DUAL SPDT 10TDFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 功能： | 音頻開關(guān) |
| 電路： | 2 x SPDT |
| 導(dǎo)通狀態(tài)電阻： | 850 毫歐 |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V |
| 電流 - 電源： | 10nA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 10-TDFN（3x3） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | AS1747-BTDT-1KDKR |
Revision 1.02
10 - 16
AS1747, AS1748, AS1749, AS1750
Datasheet - D e t a i l e d D e s c r i p t i o n
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 VCC. 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 VCC - 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 VCC/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 VCC/3.
Headphone audio signals are typical biased to VCC/2 so a comparator threshold of VCC/3 is sufficient for the head-
phone detection.
Shunt Switch (AS1749
/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 VCC before applying analog
signals, especially if the analog signal is not current-limited.
1. on request
ams
AG
Technical
content
still
valid
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AS1748-BQFT | 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-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 |
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