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AD774B Arkusz danych(PDF) 1 Page - Analog Devices |
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AD774B Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 12 page FUNCTIONAL BLOCK DIAGRAM 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 AD674B/AD774B 5V SUPPLY VLOGIC DATA MODE SELECT 12/ 8 CHIP SELECT CS BYTE ADDRESS/ SHORT CYCLE A0 READ/CONVERT R/ C CHIP ENABLE CE 12V/15V SUPPLY VCC 10V REFERENCE REF OUT ANALOG COMMON AC REFERENCE INPUT REF IN –12V/ –15V SUPPLY VEE BIPOLAR OFFSET BIPOFF 10V SPAN INPUT 10VIN 20V SPAN INPUT 20VIN STATUS STS DB11 (MSB) DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 (LSB) DIGITAL COMMON DC CONTROL VOLTAGE DIVIDER N Y B B L E A MSB 3 S T A T E O U T P U T B U F F E R S LSB N Y B B L E B N Y B B L E C CLOCK SAR 12 10V REF – + COMP I DAC 199.95 k DAC N VEE I REF DIGITAL DATA OUTPUTS REV. C 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Complete 12-Bit A/D Converters AD674B /AD774B FEATURES Complete Monolithic 12-Bit A/D Converters with Reference, Clock, and Three-State Output Buffers Industry Standard Pinout High Speed Upgrades for AD574A 8- and 16-Bit Microprocessor Interface 8 s (Max) Conversion Time (AD774B) 15 s (Max) Conversion Time (AD674B) 5 V, 10 V, 0 V–10 V, 0 V–20 V Input Ranges Commercial, Industrial, and Military Temperature Range Grades MIL-STD-883-Compliant Versions Available PRODUCT DESCRIPTION The AD674B and AD774B are complete 12-bit successive- approximation analog-to-digital converters with three-state output buffer circuitry for direct interface to 8- and 16-bit microprocessor busses. A high-precision voltage reference and clock are included on chip, and the circuit requires only power supplies and control signals for operation. The AD674B and AD774B are pin-compatible with the indus- try standard AD574A, but offer faster conversion time and bus- access speed than the AD574A and lower power consumption. The AD674B converts in 15 µs (maximum) and the AD774B converts in 8 µs (maximum). The monolithic design is implemented using Analog Devices’ BiMOS II process allowing high-performance bipolar analog circuitry to be combined on the same die with digital CMOS logic. Offset, linearity, and scaling errors are minimized by active laser trimming of thin-film resistors. Five different grades are available. The J and K grades are specified for operation over the 0 °C to 70°C temperature range. The A and B grades are specified from –40 °C to +85°C, the T grade is specified from –55 °C to +125°C. The J and K grades are available in a 28-lead plastic DIP or 28-lead SOIC. All other grades are available in a 28-lead hermetically sealed ceramic DIP. PRODUCT HIGHLIGHTS 1. Industry Standard Pinout: The AD674B and AD774B use the pinout established by the industry standard AD574A. 2. Analog Operation: The precision, laser-trimmed scaling and bipolar offset resistors provide four calibrated ranges: 0 V to 10 V and 0 V to 20 V unipolar; –5 V to +5 V and –10 V to +10 V bipolar. The AD674B and AD774B operate on +5 V and ±12 V or ±15 V power supplies. 3. Flexible Digital Interface: On-chip multiple-mode three-state output buffers and interface logic allow direct connection to most microprocessors. The 12 bits of output data can be read either as one 12-bit word or as two 8-bit bytes (one with 8 data bits, the other with 4 data bits and 4 trailing zeros). 4. The internal reference is trimmed to 10.00 V with 1% maxi- mum error and 10 ppm/ °C typical temperature coefficient. The reference is available externally and can drive up to 2.0 mA beyond the requirements of the converter and bipo- lar offset resistors. 5. The AD674B and AD774B are available in versions compli- ant with MIL-STD-883. Refer to the Analog Devices Mili- tary Products Databook or current AD674B/AD774B/883B data sheet for detailed specifications. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 |
Podobny numer części - AD774B_15 |
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Podobny opis - AD774B_15 |
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