The AD670 is a complete 8-bit signal conditioning analog-to-digital converter. It consists of an instrumentation amplifier front end along with a DAC, comparator, successive approximation register (SAR), precision voltage reference, and a three-state 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 trims for gain or offset are required. Conversion time of the device is 10 µs.
The AD670 is available in four package types and five grades. The J and K grades are specified over 0°C to +70°C and come in 20-pin plastic DIP packages or 20-terminal PLCC packages. The A and B grades (-40°C to +85°C) and the S grade (-55°C to +125°C) come in 20-pin ceramic DIP packages.
The S grade is also available with optional processing to MIL-STD-883 in 20-pin ceramic DIP or 20-terminal LCC packages. The Analog Devices Military Products Databook should be consulted for detailed specifications.
|Title||Content Type||File Type|
|AD670: Military Data Sheet (Rev A, 01/2002) (pdf)||Data Sheets|
|AD670: Low Cost Signal Conditioning 8-Bit ADC Data Sheet (Rev A, 04/2002) (pdf, 364 kB)||Data Sheets|
|AN-289: AD670 8-Bit A/D Converter Mates Transducers with Microprocessors (pdf, 676 kB)||Application Notes|
ADI Warns Against Misuse of COTS Integrated Circuits
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Invites Customer Participation in Creative Mil/Aero System Solutions
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Product Change notice for change of Analog Devices, Inc. Aerospace Product Line standard product from 883 Class S to MIL-PRF-38535, level V.
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Many Analog Devices products can be purchased as Class K die.
Standard Space Level Products Program
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This brochure describes the standard flow and how to order Analog Devices, Inc. standard product for Space Level not available as JAN, or QML. It replaces the Standard Class S brochure.
Space Qualified Parts List
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This document lists 67 (240+) space level products that are available from Analog Devices. Many of the products listed are state-of-the-art data conversion and signal processing products that were previously only available as commercial or military Class B products. Through our Space Products Group and MIL-PRF-38535 certified Level V (Class S) facility, we are pleased to offer these products to the space marketplace.
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