This article introduces how to use LTC1410 high performance ADC, how to provide clean analog input signal to ADC, how to ensure that the power supply ground is clean, how to ensure that the reference voltage is clean, and how to ensure that the clock signal is clean.
This document is an application note titled "The Care and Feeding of High Performance ADCs," published by Linear Technology in July 1997. It focuses primarily on the LTC1410, a 12-bit, 1.25Msps analog-to-digital converter (ADC), though it provides general advice applicable to other high-speed converters.
The text details critical layout and circuit design techniques required to maintain ADC performance. Key topics include proper grounding strategies using separate analog and digital planes, effective supply and reference bypassing with low-inductance capacitors, driving the analog input with appropriate op amps or filters, and selecting suitable operational amplifiers to minimize distortion.
| Resolution | 12-bit |
|---|---|
| Conversion Rate | 1.25Msps |
The document focuses on the LTC1410, a 1.25Msps, 12-bit ADC.
The two ground planes must be tied together at only one point to prevent digital currents from taking shortcuts through the analog ground.
For best performance, supply bypass leads should be less than one-half inch long.