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Interfacing op amps to high-speed DACs Part 1 Current-sinking DACs [复制链接]

Introduction
Digital-to-analog converters (DACs) come
in many bit resolutions and sampling
speeds. Outputs from lower-speed DACs
are often single-ended and have either a
voltage or a current output. Most highspeed
DACs are designed with complementary
outputs that either source or
sink current. This article, Part 1 of a
three-part series, discusses the interface
between a current-sinking DAC and an
op amp. Part 2, which will appear in a
future issue of the Analog Applications
Journal, will discuss the interface
between a current-sourcing DAC and
an op amp. Part 3, also in a future issue
of the Analog Applications Journal,
will provide a simplified approach to the
interface analogy presented in Part 2.
High-speed DACs are used in endequipment
applications like communications,
test equipment, medical applications, industrial
applications, and many more where signal generation
is
required. Each of these applications has its own specific
requirements for signal characteristics and performance.
This article focuses on end equipment that requires DC
coupling, like signal generators with frequency bandwidths
of up to 100 MHz and a single-ended output. In these
cases, high-speed op amps can provide a good solution for
converting the complementary-current output from a highspeed
DAC to a voltage that can drive the signal output

Interfacing op amps to high-speed DACs Part 1 Current-sinking DACs.pdf

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