MUX508 Datasheet, PDF (27/37 Pages) Texas Instruments – Low-Capacitance, Low-Charge-Injection, Precision, Analog Multiplexers

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MUX508, MUX509
SBAS758A – JANUARY 2016 – REVISED MARCH 2016
Typical Application (continued)
10.2.2 Detailed Design Procedure
The purpose of this precision design is to design an optimal, high-voltage, multiplexed, data-acquisition system
for highest system linearity and fast settling. The overall system block diagram is illustrated in Figure 42. The
circuit is a multichannel, data-acquisition signal chain consisting of an input low-pass filter, mux, mux output
buffer, attenuating SAR ADC driver, and the reference driver. The architecture allows fast sampling of multiple
channels using a single ADC, providing a low-cost solution. This design systematically approaches each analog
circuit block to achieve a 16-bit settling for a full-scale input stage voltage and linearity for a 10-kHz sinusoidal
input signal at each input channel.
For step-by-step design procedure, circuit schematics, bill of materials, PCB files, simulation results, and test
results, refer to TI Precision Design TIPD151, 16-Bit, 400-kSPS, 4-Channel Multiplexed Data-Acquisition
System for High-Voltage Inputs with Lowest Distortion.
10.2.3
Application Curve
1.0
0.8
0.6
0.4
0.2
0.0
±0.2
±0.4
±0.6
±0.8
±1.0
±20 ±15 ±10 ±5
0
5 10 15 20
ADC Differential Peak-to-Peak Input (V)
C030
Figure 43. ADC 16-Bit Linearity Error for the Multiplexed Data-Acquisition Block
Copyright © 2016, Texas Instruments Incorporated
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