AS1747, AS1748, AS1749, AS1750

Low-Vo ltage, Dual SPDT, A udio Clickless Switches with

Negative Rail Capability

www.austriamicrosystems.com/Analog-Switches/AS1747-50

Revision 1.02

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Data sheet

1 General Description

The SPDT (single-pole/double-throw) switches AS1747,

AS1748, AS1749 and AS1750 allow signals below

ground to pass through without distortion. These analog

switches are ideal for switching audio signals, due to

their supply voltage from +1.8V to +5.5V and their low

0.4

Ω on-resistance.

An included comparator offers the AS1748 and AS1750

with headphone detection or mute/send key function.

To reduce click-and-pop sounds when switching

between pre-charged points the AS1749 and AS1750

have an internal shunt switch. This shunt switch auto-

matically discharges any capacitance at the NO and NC

connection points.

This SPDT switch is available in space-saving 10-pin

TDFN 3x3 packages and operate over the -40ºC to

+85ºC extended temperature range.

Figure 1. Typical Operating Circuit

2 Key Features

!

Distortion -Free Negative Signal Throughput Down

!

Comparator for Headphone or Mute Detection

(AS1748/AS1750)

!

Internal Shunt Resistor Reduces Click/Pop

(AS1749/AS1750)

!

0.4

Ω at +2.7V Supply

!

0.25

Ω On-Resistance Flatness

!

0.03

Ω On-Resistance Matching

!

+1.8V to +5.5V Supply Voltage

!

-90dB Crosstalk (100kHz)

!

-65dB Off-Isolation (100kHz)

!

0.01% Total Harmonic Distortion

!

Available in 10-pin TDFN 3x3, 16-pin TQFN 3x3,

and 12-Bump WL-CSP Packages

3 Applications

The device is ideal for cell phones, PDAs and hand-held

devices, notebook computers and MP3 players.

Audio

Source 1

Audio

Source 2

Out+

Out-

Out+

Out-

CMPO

NO2

NC2

NO1

NC1

Mute

IN1

COM1

IN2

COM2

CMP-

Mute

Button

V+

Shunt

Switch

+

-

8

Ω

Speaker

Input

Select

V+/3