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AD7303BN Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7303BN Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 16 page REV. 0 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 +2.7 V to +5.5 V, Serial Input, Dual Voltage Output 8-Bit DAC AD7303 FUNCTIONAL BLOCK DIAGRAM I DAC A POWER ON RESET DIN SYNC SCLK REF VDD AD7303 VOUT A VOUT B GND I/V INPUT REGISTER MUX DAC REGISTER I/V INPUT REGISTER DAC REGISTER ÷2 16-BIT SHIFT REGISTER DATA (8) CONTROL (8) I DAC B FEATURES Two 8-Bit DACs in One Package 8-Pin DIP/SOIC and microSOIC Packages +2.7 V to +5.5 V Operation Internal & External Reference Capability Individual DAC Power-Down Function Three-Wire Serial Interface QSPI™, SPI™ and Microwire™ Compatible On-Chip Output Buffer Rail-to-Rail Operation On-Chip Control Register Low Power Operation: 2.3 mA @ 3.3 V Full Power-Down to 1 A max, typically 80 nA APPLICATIONS Portable Battery Powered Instruments Digital Gain and Offset Adjustment Programmable Voltage and Current Sources Programmable Attenuators PRODUCT HIGHLIGHTS 1. Low power, single supply operation. This part operates from a single +2.7 V to +5.5 V supply and consumes typically 15 mW at 5.5 V, making it ideal for battery powered applications. 2. The on-chip output buffer amplifiers allow the outputs of the DACs to swing rail to rail with a settling time of typically 1.2 µs. 3. Internal or external reference capability. 4. High speed serial interface with clock rates up to 30 MHz. 5. Individual power-down of each DAC provided. When com- pletely powered down, the DAC consumes typically 80 nA. GENERAL DESCRIPTION The AD7303 is a dual, 8-bit voltage out DAC that operates from a single +2.7 V to +5.5 V supply. Its on-chip precision out- put buffers allow the DAC outputs to swing rail to rail. This de- vice uses a versatile 3-wire serial interface that operates at clock rates up to 30 MHz, and is compatible with QSPI, SPI, microwire and digital signal processor interface standards. The serial input register is sixteen bits wide; 8 bits act as data bits for the DACs, and the remaining eight bits make up a control register. The on-chip control register is used to address the relevant DAC, to power down the complete device or an individual DAC, to select internal or external reference and to provide a synchronous loading facility for simultaneous update of the DAC outputs with a software LDAC function. The low power consumption of this part makes it ideally suited to portable battery operated equipment. The power consump- tion is 7.5 mW max at 3 V, reducing to less than 3 µW in full power-down mode. The AD7303 is available in an 8-pin plastic dual in-line pack- age, 8-lead SOIC and microSOIC packages. QSPI and SPI are trademarks of Motorola. Microwire is a trademark of National Semiconductor. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 |
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