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Position Encoder Does Away with ADC - 05/08/97 EDN Design Idea The position encoder in Figure 1 is a simple yet powerful circuit
that converts the change in resistance of a potentiometer into a digital value without using an expensive A/D
converter. The working principle is a resistance-to-P. . . [by Jose Carlos Cossio, Santander, Spain]
Precision 24-Bit, 250
kSPS Single-Supply Sigma-Delta ADC System for Industrial Signal Levels
- Equipment Required The following equipment is required: , Bullet text,
Software Installation The AD7176-2 evaluation kit includes self-installing software on a CD. The software is
compatible with Windows® XP (SP2), Windows Vista, and Windows 7 (32 bit or 64 bit). Setup and Test Refer to the
UG-478 user guide for complete details of using the software and running the tests. . . [Analog Devices-
from the Lab]
Precision ADC interface -
08/21/03 EDN Design Idea Real-world measurement requires the extraction of weak signals from noisy sources.
High common-mode voltages are often present even in differential measurements. The usual approach to this problem
is to use an op amp or an instru. . . [by Moshe Gerstenhaber and Charles Kitchin, Analog Devices, Wilmington, MA
]
Precision circuit closely monitors –48V bus - 10/17/02
EDN Design Idea Ever-greater complexity in communications systems has spurred a need for power-supply
management. POTS (plain-old telephone systems] obtain power from –48V supplies backed by arrays of batteries in
central offices and distributed th. . . [by Paul Smith and Jim Staley Analog Devices, Wilmington, MA]
Precision Weigh Scale
Design Using a 24-Bit Sigma-Delta ADC with Internal PGA and AC Excitation
- The noise of the system is calculated by the software to be 10 nV rms and 51
nV peak-to-peak. This equates to 196, 000 noise-free counts, or 17. 5 bits of noise-free code resolution
(calculated from the measured peak-to-peak noise). . . [Analog Devices-Circuits from the Lab]
Precision Weigh Scale
Design Using the AD7190 24-Bit Sigma-Delta ADC with Internal PGA
- Using LabView software, the performance of the weigh scale system can be
evaluated. The noise of the system is calculated by the software to be 12 nV rms and 88 nV peak-to-peak. This
equates to 113, 600 noise-free counts, or 16. 8 bits of noise-free code resolution. , Circuit Description,
Circuit Description, Figure 5 shows the performance in terms of weight. . . [Analog Devices-Circuits from the
Lab]
Precision Weigh Scale
Design Using the AD7191 24-Bit Sigma-Delta ADC with Internal PGA
- Using LabView software, the performance of the weigh scale system can be
evaluated. The noise of the system is calculated by the software to be 17 nV rms and 98 nV peak-to-peak. This
equates to 102, 000 noise-free counts or 16. 6 bits of noise-free code resolution. , Circuit Description, Figure
4 shows the performance in terms of weight. . . [Analog Devices-Circuits from the Lab]
Precision Weigh Scale
Design Using the AD7192 24-Bit Sigma-Delta ADC with Internal PGA
- Using LabView software, the performance of the weigh scale system can be
evaluated. The noise of the system is calculated by the software to be 14 nV and is 98 nV peak-to-peak. This
equates to 102, 000 noise-free counts or 16. 6 bits of noise-free code resolution. , Circuit Description, Circuit
Description, Figure 4 shows the performance in terms of weight. . . [Analog Devices-Circuits from the Lab]
Precision Weigh Scale
Design Using the AD7791 24-Bit Sigma-Delta ADC with External ADA4528-1 Zero-Drift Amplifiers
- Follow the instructions contained in the Readme file for installing and
using the evaluation software. , Functional Block Diagram See Figure 1 of this circuit note for the circuit block
diagram, and the PDF file “EVAL-CN0216-SDPZ-SCH” for the circuit schematics. . . [Analog Devices-Circuits from
the Lab]
Printer Port Controls A/D Conversion - 12/19/96 EDN Design Idea The circuit in Figue 1 uses a microcontroller (PIC16C71] as an
A/D converter and a data organizer. The circuit plugs directly into a PC printer port and needs no external power
supply. Under the control of the Borland C program in. . . [by Yongping Xia, Philips Lighting Electronics Co,
Torrance, CA]
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