Product category:
Analogue and Mixed Signal ICs
News Release from: Fairchild Semiconductor | Subject: FSA4157, FSA3157 and FSA3357
Edited by the Electronicstalk Editorial
Team on 22 October 2003
Tiny packaging for hifi analogue
switches
Three new analogue switches for cellphone audio circuits feature low total harmonic distortion and flat on-resistance characteristics to provide the best possible audio fidelity.
Three new analogue switches for cellphone audio circuits feature low total harmonic distortion and flat on-resistance characteristics to provide the best possible audio fidelity in packages one-third the size of current alternatives Packaged in chip-scale MicroPak, Fairchild's new FSA4157 single pole/double throw (SPDT), FSA1156 normally open (NO) single pole/single throw and the FSA1157 normally closed (NC) single pole/single throw analogue switches provide a 65% space savings over traditional SC70 packaging and are the industry's smallest switches of their kind
This article was originally published on Electronicstalk on 28 Feb 2001 at 8.00am (UK)
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These switches all have low on resistance of 1.15ohm maximum at 4.5V common-collector voltage that improves signal integrity by not attenuating the signal and by reducing the drive that is required for the volume of the speaker.
The FSA4157, FSA1156 and FSA1157 have a wide operating range of 1.65-5.5V, an added benefit for cellphone batteries that are subject to overcharges of up to 4.6V.
The switches' higher operating voltage enables the devices to easily accommodate this overcharge, unlike typical 3.3V-rated analogue switches.
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The switches also provide designers with a 350MHz bandwidth for high-speed analogue and digital signal routing in low supply voltage applications, while providing superior ESD protection through their 7.5kV (human body model) rating.
These devices add to Fairchild's portfolio of analogue switches for the mobile phone market.
For mobile phones featuring speakerphone functionality, the MicroPak packaged FSA3157 is a high-performance, single-pole/double-throw (SPDT) analogue switch.
This device is fabricated with advanced submicron CMOS technology to achieve high speed enable and disable times of only 7-23 and 3.5-12.5ns, respectively, as well as low on resistance of typically less than 10ohms at 3.3V.
Where a signal is to be switched between three sources, the new Fairchild FSA3357 replaces the usual two separate SPDT switches with one device.
The FSA3357 is a high performance, single-pole/double-throw (SPDT) analogue switch or 2:1 multiplexer/demultiplexer bus switch featuring "break before make" select circuitry to prevent disruption of signals.
These lead-free (Pb-free) products meet or exceed the requirements of the joint IPC/JEDEC standard J-STD-020B and are compliant with the European Union requirements, which will take effect in 2005.
The FSA4157, FSA3157 and FSA3357 are available now.
The FSA1156 and FSA1157 will be available from the 1st November, with engineering samples obtainable now.
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