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AD670JP 데이터시트(PDF) 1 Page - Analog Devices |
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AD670JP 데이터시트(HTML) 1 Page - Analog Devices |
1 / 12 page FUNCTIONAL BLOCK DIAGRAM REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Low Cost Signal Conditioning 8-Bit ADC AD670 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 GENERAL DESCRIPTION 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 approxima- tion 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 pro- vides 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 applica- tions 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 I 2L (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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 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. PRODUCT HIGHLIGHTS 1. The AD670 is a complete 8-bit A/D including three-state outputs and microprocessor control for direct connection to 8-bit data buses. No external components are required to perform a conversion. 2. The flexible input stage features a differential instrumenta- tion amp input with excellent common-mode rejection. This allows direct interface to a variety of transducers without preamplification. 3. No user trims are required for 8-bit accurate performance. 4. Operation from a single +5 V supply allows the AD670 to run off of the microprocessor’s supply. 5. Four convenient input ranges (two unipolar and two bipolar) are available through internal scaling resistors: 0 mV to 255 mV (1 mV/LSB) and 0 V to 2.55 V (10 mV/LSB). 6. Software control of the output mode is provided. The user can easily select unipolar or bipolar inputs and binary or 2s complement output codes. |
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