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AD670

Analog Devices
Part Number AD670
Manufacturer Analog Devices
Description Low Cost Signal Conditioning 8-Bit ADC
Published Mar 23, 2005
Detailed Description a FEATURES Complete 8-Bit Signal Conditioning A/D Converter Including Instrumentation Amp and Reference Microprocessor B...
Datasheet PDF File AD670 PDF File

AD670
AD670

Overview
a FEATURES Complete 8-Bit Signal Conditioning A/D Converter Including Instrumentation Amp and Reference Microprocessor Bus Interface 10 ␮ s Conversion Speed Flexible Input Stage: Instrumentation Amp Front End Provides Differential Inputs and High Common-Mode Rejection No User Trims Required No Missing Codes Over Temperature Single +5 V Supply Operation Convenient Input Ranges 20-Pin DIP or Surface-Mount Package Low Cost Monolithic Construction MIL-STD-883B Compliant Versions Available Low Cost Signal Conditioning 8-Bit ADC AD670 FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION The AD670 is a complete 8-bit signal conditioning analogto-digital converter.
It consists of an instrumentation amplifier front end along with a DAC, comparator, successive approximation register (SAR), precision voltage reference, and a threestate output buffer on a single monolithic chip.
No external components or user trims are required to interface, with full accuracy, an analog system to an 8-bit data bus.
The AD670 will operate on the +5 V system supply.
The input stage provides differential inputs with excellent common-mode rejection and allows direct interface to a variety of transducers.
The device is configured with input scaling resistors to permit two input ranges: 0 mV to 255 mV (1 mV/LSB) and 0 to 2.
55 V (10 mV/LSB).
The AD670 can be configured for both unipolar and bipolar inputs over these ranges.
The differential inputs and common-mode rejection of this front end are useful in applications such as conversion of transducer signals superimposed on common-mode voltages.
The AD670 incorporates advanced circuit design and proven processing technology.
The successive approximation function is implemented with I2L (integrated injection logic).
Thin-film SiCr resistors provide the stability required to prevent missing codes over the entire operating temperature range while laser wafer trimming of the resistor ladder permits calibration of the device to within ± 1 LSB.
Thus, no user tri...


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