What causes a voltage glitch in a multiplexer?
A voltage glitch or kickback occurs at the multiplexer input when it switches channels. This kickback is a function of the turn-on and turn-off times, on-resistance, and load capacitance. Large switches with low on-resistance typically result in a large output capacitance that must be charged to a new voltage each time the input is switched.
How is the capacitive DAC of the SAR ADC disconnected?
The capacitive DAC of the SAR ADC is disconnected from the inputs at the start of the conversion, and the multiplexer channel can be switched to the next channel after a small switching delay, tS. This allows the maximum time to settle the selected channel.
What’s the quiet time for a 5 MSPs multiplexer?
The 5-MSPS throughput rate allows multiple channels to be multiplexed at fast scan rates, so fewer ADCs are required in high-channel-count systems. During the conversion, the AD7960 has a quiet-time requirement at 90 ns to 110 ns where the multiplexer inputs must not be switched.
What happens when the multiplexer input channel is switched?
When the multiplexer input channel is switched, the ADC driver amplifier must settle a large voltage step within the specified sample period. The input can change from negative full-scale to positive full-scale, or vice versa, so a large input voltage step can be created in a small time.
Is the max9934 a low voltage or high precision amplifier?
Active in production But some versions of the family are subject to Last Time Buy. The MAX9934 high-precision, low-voltage, high-side current-sense amplifier is ideal for both bidirectional (charge/discharge) and unidirectional current measurements in battery-powered portable and laptop devices.
How does multiplexing save power and save money?
Multiplexing allows the use of fewer ADCs per system, offering significant savings in power, size, and cost.