JAJSFG7L June 1999 – July 2024 THS4031 , THS4032
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This section demonstrates multiplexing several analog input signals to a high-performance driver amplifier which subsequently drives a single high-resolution, high-speed SAR analog-to-digital converter (ADC). This example uses the ADS8411 and the TS5A3159 or TS5A3359 as the ADC and the multiplexer, respectively. This application uses the THS403x as the operational amplifier.
As detailed in Figure 7-4, the example system consists of an ADC (ADS8411), a driving operational amplifier (THS4031), a multiplexer (TS5A3159), an ac source, a dc source, and two driving operational amplifiers.
The driving amplifiers OPA1 are OPA2 are shown as two THS4031 amplifiers. Alternatively, use a single THS4032 to save on cost and board space. The purpose of these op-amps is make the input sources present a low impedance to rest of the circuit. Additionally, to maintain signal fidelity, these operational amplifiers must have low noise and distortion. The third THS4031 labeled OPA3 in Figure 7-4 is used to maintain switching speed and drive the ADC. The passive band-pass filter before the ADC reduces unwanted noise.