Analogue switch uses TTL-level control

The FSAT66 is a low-voltage single-pole/single-throw analogue switch that uses TTL-level control circuitry to allow designers to route higher voltage signals using lower voltage control levels.

The FSAT66 is a low-voltage single-pole/single-throw (SPST) analogue switch that uses TTL-level control circuitry to allow designers to route higher voltage signals using lower voltage control levels.

The normally open (NO) FSAT66's MicroPak package (1.45mm2) is the smallest form factor with this function on the market today, and ideal for use in mobile phones, digital cameras, PDAs, disk drives and other handheld electronics.

"For handheld electronics, there's a critical need for analogue switches with TTL level control, a major benefit of which is preventing interoperability problems", says Seth Prentice, Fairchild Product Marketing Manager for Analogue Switches.

"One example might be an analogue switch with a 5V VCC and CMOS logic levels that need 3.75V on the select pin to change states.

Alternatively, an analogue switch with TTL logic levels requires only 2.0V to change states.

The lower TTL logic level allows the switch to be controlled by ASICs or microprocessors of 3.0V or lower.

The FSAT66 SPST analogue switch provides designers with a simple, high-performance solution for combining technologies in devices with mixed voltage levels".

An important feature of the FSAT66 is its preservation of signal integrity.

A low on resistance of 5ohm reduces signal attenuation.

With a low charge injection of 0.05pC, there is less noise induced by the control circuitry.

The FSAT66 offers minimal total harmonic distortion (THD) of 0.011% that is ideal for audio applications.

The FSAT66 device is available in two packaging configurations - 5-lead SC70 (model FSAT66P5X, 3000-piece tape-and-reel) and 6-lead chip-scale MicroPak (model FSAT66L6X, 5000-piece tape-and-reel).

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