AS1747(2009) 查看數據表（PDF） - austriamicrosystems AG

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AS1747
(Rev.:2009)

Low-Voltage, Dual SPDT, Audio Clickless Switch with Negative Rail Capability

austriamicrosystems AG 

AS1747

Datasheet - Detailed Description

8 Detailed Description

The AS1747 operates from a +1.8V to +5.5V supply and features a negative signal capability that allows signals below

ground to pass through without distortion. A break-before-make switching and a low on-resistance is also included in

this analog dual SPDT switch. The device is fully specified for a 3.0V application.

9 Application Information

Digital Control Inputs

The logic inputs of the AS1747 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 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 pass signals as low as VCC - 5.5V, including signals below ground with minimal distortion.

Power-Supply Sequencing and Overvoltage Protection

Caution: Do not exceed the absolute maximum ratings since stresses beyond the listed ratings may cause

permanent damage to the device.

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.

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