THS4031_16 Datasheet, PDF (25/47 Pages) Texas Instruments – THS403x 100-MHz Low-Noise High-Speed Amplifiers

www.ti.com
10 Application and Implementation
THS4031, THS4032
SLOS224H – JULY 1999 – REVISED JUNE 2016
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
This application report is intended as a guide for using an analog multiplexer to multiplex several input signals to
a high-performance driver amplifier which subsequently drives a single high-resolution, high-speed SAR analog-
to-digital converter (ADC). The ADC and the multiplexer used were the ADS8411 and the TS5A3159 or
TS5A3359, respectively. The operational amplifier used in this application was the THS4031.
10.2 Typical Application
As shown in Figure 60, the evaluation system consists of the ADC (ADS8411), a driving operational amplifier
(THS4031), the multiplexer (TS5A3159), an AC source, a DC source, and two driving operational amplifiers (two
THS4031s or a single THS4032) for the sources to make them a low-impedance source, a passive band-pass
filter after the AC source to filter the source noise and distortion.
Copyright © 2016, Texas Instruments Incorporated
Figure 60. Evaluation Set-Up
10.2.1 Design Requirements
Design a multiplexed digitizer system with the dynamic performance shown in Table 4:
DEVICE SPEED
(MSPS)
2
2
Table 4. Design Specifications
INPUT FREQUENCY (kHz)
20
100
SNR (dB)
> 84
> 84
THD (dB)
< –90
< –90
CROSSTALK (dB)
< –110
< –96
10.2.2 Detailed Design Procedure
The ADS8411 is a 16-bit, 2-MSPS analog-to-digital converter (ADC) with a 4-V reference. The device includes a
16-bit capacitor-based SAR ADC with inherent sample and hold. It has a unipolar single-ended input. The device
offers a 16-bit parallel interface.
Copyright © 1999–2016, Texas Instruments Incorporated
Product Folder Links: THS4031 THS4032
Submit Documentation Feedback
25