Driving a Low Noise, Low Distortion 18-Bit, 1.6Msps ADC Design Note 494

About this manual

The document provides design guidance for driving the LTC2379-18, an 18-bit, 1.6Msps SAR ADC with high SNR and THD. It presents two specific circuit solutions: a fully differential driver using the LT6203 to convert ±5V signals to 0V to 5V, and a single supply driver using the LTC6350 and digital gain compression for ±10V inputs.

What's inside

• Introduction
• Fully Differential Driver
• Single Supply Driver
• Layout Considerations

Frequently asked questions

What is the full-scale input swing for a single supply driver using a 5V reference?

The full-scale input swing is defined as 10% to 90% of the reference voltage, which results in a range of 0.5V to 4.5V.

What is the maximum single-ended input voltage accepted by the circuit in Figure 3?

The circuit accepts a ±10V single-ended input voltage.

What is the total power consumption reduction achieved by using the digital gain compression feature?

Using this feature reduces the overall power consumption of the ADC driver portion of the circuit by a factor of two.