AS1741 Analog Switch IC

Description

The AS1741/AS1742/AS1743 are high-speed, low-voltage, dual single-pole/single-throw (SPST) analog switches. Fast switching speeds, low ON-resistance, and low power-consumption make these devices ideal for single-cell battery powered applications.

These highly-reliable devices operate from a single +1.6V to +3.6V supply, and are differentiated by the type and number of switches:

• AS1741 – Two normally open (NO) switches
• AS1742 – Two normally closed (NC) switches
• AS1743 – One NO switch and one NC switch

The AS1743 supports break-before-make switching. With very low ON-resistance (RON), RON matching, and RON flatness, the devices can accurately switch signals for sample and hold circuits, digital filters, and op-amp gain switching networks.

The AS1741/AS1742/AS1743 digital logic input is 1.8V CMOS-compatible when using a single +3V supply, and all devices can handle Rail-to-Rail signals. The devices are available in an 8-pin SOT23 and MSOP package.

Key Features

• ON-Resistance:
  • 0.8Ω (+3V supply)
  • 2.5Ω (+1.8V supply)
• RON Matching: 0.08Ω (+3V supply)
• RON Flatness: 0.18Ω (+3V supply)
• Supply Voltage Range: +1.6V to +3.6V
• Switching Action: tON = 22ns, tOFF = 14ns
• Current-Handling: 250mA Continuous
• Break-Before-Make Switching (AS1743)
• Rail-to-Rail Signal Handling
• 1.8V CMOS Logic Compatible (+3V supply)
• Total Harmonic Distortion: 0.03%
• Operating Temperature Range: -40ºC to +85ºC
• 8-pin SOT23 and MSOP Package

Applications

The devices are ideal for use in power routing systems, cordless and mobile phones, MP3 players, CD and DVD players, PDAs, handheld computers, digital cameras, hard drives, and any other application where high-speed signal switching is required.

Block Diagram