MAX398CSE

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Analog switches, multiplexers, and demultiplexers are components of an analog circuit that is used to control visual or audible signals. The MAX398CSE is a device within this domain that provides precision analog signal switching through its fully differential outputs.

The MAX398CSE features an optimized digital controlled analog switch having superior switch-on resistance matching and low digital feedthrough, low distortion, minimal crosstalk, and low power consumption. It has an integrated low-pass active filter, which improves digital audio playback performance.The device has a 0.7V offset output capability, which allows direct connection to op amps. The device also includes an internal switch debouncer, allowing it tobe used as a low noise, low power analog switch for audio applications.

The MAX398CSE iswellsuited for applications requiring low noise, low distortion, and low attenuationswitching. It functions as a signal switchfor modem and telecommunication lines, audio switches, volume and mute control, analog signal switching, and ADC/DAC input/output signal switching. These applications require low offsets, low distortion, and low signal attenuation.TheMAX398CSE is available in 28 or 44 lead TSSOP packages.

The MAX398CSE operates usingthe popular switched capacitor (SC) architecture,which uses low-cost capacitors and opamps to create precision-controlled switch timing. Switched capacitor technology is advantageous because it offers several high-performance features, including low noise, low distortion, and low power consumption. It is well-suited for applications in which signal fidelity and low audible noise are important.

The device operates by charging and discharging capacitors at a particular rate determined by the switching frequency, which is generated by the oscillator in the device. This creates a capacitive node that stores voltage corresponding to the input signal and can switch between two different output voltages if necessary. The SC architecture is more efficient than the more traditional resistive switching techniques because it eliminates resistive losses typically associated with switching and reduces the number of componentsrequired. This makes it easier and less expensive to use in various applications.

The device is divided into four main functional blocks, the input multiplexer, control logic, oscillator, and switch array. The input multiplexer receives an analogsignaland the control logic blockreceives the digital control signal. The logic block then decodes the digital control signal and sends an appropriate signal to the oscillator, which in turn generates the switch timing signals. The switch array then gets the generated switch timing signals and acts accordingly to switch the desired signal from the input multiplexer output to the device’s output. The internal rail-to-rail voltage levelshifters and input registers provide support for a wide common mode voltage range for control input signals.The outputof the deviceis in differential form and is ac-coupled through low-pass filters to the adjacent block if necessary.

The MAX398CSE is designed to have low attenuation, low distortion, low offset, and low power consumption. Offset is reduced by controlling the switch-on resistance, while low distortion and low attenuation is achieved by keeping the switch timing constant. The internal low-pass active filter improves the dierential and common-mode rejection, while the internal dc feedback reduces offset voltages. The low power consumption of the device is achieved by optimizing the power management circuit.

The MAX398CSE is an ideal solution for applications requiring high fidelity analogue signal switching and audio playback. It has the advantage of providing precision switching with low distortion, low noise, and low power consumption. The device is available in a 28 or 44-lead TSSOP package, making it suitable for space-constrained applications.

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