Analog Multiplexer Settling-Time Calculator

A tool to estimate settling time and multiplexed sampling rate for an idealized multiplexer.

使用说明 | 故障排除 | 相关信息 | | 返回至模拟开关主页

Device / Application Data
R_SOURCE	ohms
R_ON	ohms
R_LOAD	ohms
C_{S (OFF)}	pF
C_{D (OFF)}	pF
C_LOAD	pF

Transition time	ns
Prog. gain amp. settling time	ns

Instructions

This calculator estimates settling time for a multiplexer by calculating the slower of the two time constants for a cascaded RC network, then computing how many of that time constant must pass before the system will settle to within 1%, 0.1%, 0.01% and 0.001% of its final value.

The Analog Multiplexer Settling-Time Calculator also estimates the maximum sampling rate possible for a classic A/D converter with S/H input. The sampling rate is estimated as 1/sqrt( (t_settle+t_transition)² + t_PGA²). This number should be less than the sum of t_ACQ+t_CONV, otherwise the maximum sampling frequency will be limited by the latter. The maximum sampling frequency estimate is shown in megasamples/second to the right of the settling time number.

To use the calculator, enter the multiplexer parameters in R_ON, C_S and C_D and the application parameters in R_SOURCE, R_LOAD and C_LOAD. Tabbing from one field to the other updates the tabular display at right, or click "Calculate".

Troubleshooting

No special issues are known to exist with the Analog Multiplexer Settling-time Calculator at this time.

The latest version of the Java Applet Plugin is required to run this design tool. It can be downloaded here.
To enable browser based Java Applets, read our FAQ.