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ADCS FOR SIGNAL CONDITIONING SECTION 8 ADCs FOR SIGNAL CONDITIONING

By Walt Kester, James Bryant and Joe Buxton

Abstract

The trend in ADCs and DACs is toward higher speeds and higher resolutions at reduced power levels. Modern data converters generally operate on ±5V (dual supply) or +5V (single supply). In fact, many new converters operate on a single +3V supply. This trend has created a number of design and applications problems which were much less important in earlier data converters, where ±15V supplies and ±10V input ranges were the standard. Lower supply voltages imply smaller input voltage ranges, and hence more susceptibility to noise from all potential sources: power supplies, references, digital signals, EMI/RFI, and probably most important, improper layout, grounding, and decoupling techniques. Single-supply ADCs often have an input range which is not referenced to ground. Finding compatible single-supply drive amplifiers and dealing with level shifting of the input signal in direct-coupled applications also becomes a challenge. In spite of these issues, components are now available which allow extremely high resolutions at low supply voltages and low power. This section discusses th

Topics: LOW POWER, LOW VOLTAGE ADC DESIGN ISSUES ■ Typical Supply Voltages, ±5V, 5V, 5/+3V, 3V ■ Lower Signal Swings Increase Sensitivity to All Types of Noise (Device, Power Supply, Logic, etc.) ■ Device Noise Increases at Low Currents ■ Common Mode Input Voltage Restrictions
Year: 2013
OAI identifier: oai:CiteSeerX.psu:10.1.1.309.2728
Provided by: CiteSeerX
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