CN0385 Datasheet, PDF (1/13 Pages) Analog Devices – Devices Connected

Circuits from the Lab® reference designs are engineered and
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information and/or support, visit www.analog.com/CN0385.
Circuit Note
CN-0385
Devices Connected/Referenced
AD4003
18-Bit, 2 MSPS, PulSAR®, 7.0 mW ADC in
MSOP/QFN
AD8251
10 MHz, 20 V/μs, G = 1, 2, 4, 8, iCMOS
Programmable Gain Instrumentation
Amplifier
ADuM141E
Robust, Quad Channel Isolator with
Output Enable and 1 Reverse Channel
ADG5207
High Voltage, Latch-Up Proof, 8-Channel
Differential Multiplexer
AD8475
Precision, Selectable Gain, Fully
Differential Amplifier
ADA4807-2
3.1 nV/√Hz, 1 mA, 180 MHz, Rail-to-Rail
Input/Output Dual Op Amp
Isolated, Multichannel Data Acquisition System with PGIA for Single-Ended and
Differential Industrial Level Signals
EVALUATION AND DESIGN SUPPORT
Circuit Evaluation Boards
CN-0385 Circuit Evaluation Board (EVAL-CN0385-FMCZ)
System Demonstration Platform (EVAL-SDP-CH1Z)
Design and Integration Files
Schematics, Layout Files, Bill of Materials
CIRCUIT FUNCTION AND BENEFITS
The circuit shown in Figure 1 is a cost effective, isolated, multi-
channel data acquisition system that is compatible with standard
industrial signal levels. The components are specifically selected
to optimize settling time between samples, providing 18-bit
performance at channel switching rates up to approximately
750 kHz.
The circuit can process eight gain-independent channels and is
compatible with both single-ended and differential input signals.
The analog front end includes a multiplexer, programmable
gain instrumentation amplifier (PGIA); precision analog-to-
digital converter (ADC) driver for performing the single-ended
to differential conversion; and an 18-bit, 2.0 MSPS precision
PulSAR® ADC for sampling the signal on the active channel.
Gain configurations of 0.4, 0.8, 1.6, and 3.2 are available.
The maximum sample rate of the system is 2 MSPS in turbo mode,
and 1.5 MSPS in normal mode. The channel switching logic is
synchronous to the ADC conversions, and the maximum channel
switching rate is 1.5 MHz. A single channel can be sampled at
up to 2 MSPS with 18-bit resolution in turbo mode. Channel
switching rates up to 750 kHz also provide 18-bit performance.
Rev. 0
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