Part # AD670 datasheet

Part Manufacturer: Analog Devices

Analog Devices

Part Description: AD670 Low Cost Signal Conditioning 8-Bit ADC

Part Details:

a Low Cost Signal Conditioning 8-Bit ADC AD670 FEATURES FUNCTIONAL BLOCK DIAGRAM Complete 8-Bit Signal Conditioning A/D Converter Including Instrumentation Amp and Reference Microprocessor Bus Interface10 s Conversion SpeedFlexible Input Stage: Instrumentation Amp Front End Provides Differential Inputs and High Common-ModeRejection No User Trims RequiredNo Missing Codes Over TemperatureSingle +5 V Supply OperationConvenient Input Ranges20-Pin DIP or Surface-Mount PackageLow Cost Monolithic ConstructionMIL-STD-883B Compliant Versions Available GENERAL DESCRIPTION The S grade is also available with optional processing to The AD670 is a complete 8-bit signal conditioning analog- MIL-STD-883 in 20-pin ceramic DIP or 20-terminal LCC to-digital converter. It consists of an instrumentation amplifier packages. The Analog Devices Military Products Databook front end along with a DAC, comparator, successive approxima- should be consulted for detailed specifications. tion register (SAR), precision voltage reference, and a three-state output buffer on a single monolithic chip. No external PRODUCT HIGHLIGHTS components or user trims are required to interface, with full 1. The AD670 is a complete 8-bit A/D including three-state accuracy, an analog system to an 8-bit data bus. The AD670 outputs and microprocessor control for direct connection to will operate on the +5 V system supply. The input stage pro- 8-bit data buses. No external components are required to vides differential inputs with excellent common-mode rejection perform a conversion. and allows direct interface to a variety of transducers. 2. The flexible input stage features a differential instrumenta- The device is configured with input scaling resistors to permit tion amp input with excellent common-mode rejection. This two input ranges: 0 mV to 255 mV (1 mV/LSB) and 0 to 2.55 V allows direct interface to a variety of transducers without (10 mV/LSB). The AD670 can be configured for both unipolar preamplification. and bipolar inputs over these ranges. The differential inputs and 3. No user trims are required for 8-bit accurate performance. common-mode rejection of this front end are useful in applica-tions such as conversion of transducer signals superimposed on 4. Operation from a single +5 V supply allows the AD670 to common-mode voltages. run off of the microprocessor s supply. The AD670 incorporates advanced circuit design and proven 5. Four convenient input ranges (two unipolar and two bipolar) processing technology. The successive approximation function are available through internal scaling resistors: 0 mV to is implemented with I2L (integrated injection logic). Thin-film 255 mV (1 mV/LSB) and 0 V to 2.55 V (10 mV/LSB). SiCr resistors provide the stability required to prevent missing 6. Software control of the output mode is provided. The user codes over the entire operating temperature range while laser can easily select unipolar or bipolar inputs and binary or 2s wafer trimming of the resistor ladder permits calibration of the complement output codes.

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AD670.pdf Datasheet