SSM-2412 Datasheet | Analog Devices

FEATURES “Clickless” Bilateral Audio Switching Guaranteed “Break-Before-Make” Switching Low Distortion: 0.003% typ Low Noise: 1 n V/√Hz Superb OFF-Isolation: 120 d B typ Low ON-Resistance: 60 ⍀ typ Wide Signal Range: VS = ؎18 V; 10 V rms Wide Power Supply Range: ؎20 V max Available in Dice Form GENERAL DESCRIPTION Dual Audio Analog Switches SSM2402/SSM2412 FUNCTIONAL BLOCK DIAGRAM The SSM2402/SSM2412 are dual analog switches designed specifically for high performance audio applications. Distortion and noise are negligible over the full audio operating range of 20 Hz to 20 k Hz at signal levels of up to 10 V rms. The SSM2402/ SSM2412 offer a monolithic integrated alternative to expensive and noisy relays or plex discrete JFET circuits. Unlike conventional general-purpose CMOS switches, the SSM2402/SSM2412 provide superb fidelity without audio “clicks” during switching. Conventional TTL or CMOS logic can be used to control the switch state. No external pull-up resistors are needed. A “T” configuration provides superb OFF-isolation and true bilateral operation. The analog inputs and outputs are protected against overload and overvoltage. An important feature is the guaranteed “break-before-make” for all units, even IC-to-IC. In large systems with multiple switching channels, all separate switching units must open before any switch goes into the ON-state. With the SSM2402/ SSM2412, you can be certain that multiple circuits will all break-before-make. The SSM2402/SSM2412 represent a significant step forward in audio switching technology. Distortion and switching noise are significantly reduced in the new SSM2402/SSM2412 bipolar JFET switches relative to CMOS switching technology. Based on a new circuit topology that optimizes audio performance, the SSM2402/SSM2412 make use of a proprietary bipolar JFET process with thin-film resistor network capability. Nitride capacitors, which are very area efficient, are used for the proprietary ramp generator that controls the switch...