austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com Datasheet AS1747, AS1748, AS1749, AS1750 Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail Capability 1 General Description 2 Key Features Distortion -Free Negative Signal Throughput Down The SPDT (single-pole/double-throw) switches AS1747, to VCC - 5.5V AS1748, AS1749 and AS1750 allow signals below ground to pass through without distortion. These analog Comparator for Headphone or Mute Detection switches are ideal for switching audio signals, due to (AS1748/AS1750) their supply voltage from +1.8V to +5.5V and their low Internal Shunt Resistor Reduces Click/Pop 0.4 on-resistance. (AS1749/AS1750) An included comparator offers the AS1748 and AS1750 Low On-Resistance (R ) ON with headphone detection or mute/send key function. 0.4 at +2.7V Supply To reduce click-and-pop sounds when switching 0.25 On-Resistance Flatness between pre-charged points the AS1749 and AS1750 have an internal shunt switch. This shunt switch auto- 0.03 On-Resistance Matching matically discharges any capacitance at the NO and NC +1.8V to +5.5V Supply Voltage connection points. -90dB Crosstalk (100kHz) This SPDT switch is available in space-saving 10-pin TDFN 3x3 packages and operate over the -40C to -65dB Off-Isolation (100kHz) +85C extended temperature range. 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. Figure 1. Typical Operating Circuit Out+ NC1 Audio Source 1 Out- COM1 NO1 IN1 Input Select 8 Shunt Speaker Switch IN2 NC2 COM2 Out+ V+ Audio Source 2 Out- NO2 V+/3 Mute + CMPO CMP- - Mute Button www.austriamicrosystems.com/Analog-Switches/AS1747-50 Revision 1.02 1 - 16 ams AG Technical content still valid