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AD7304BR-REEL Datasheet(PDF) 1 Page - Analog Devices |
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AD7304BR-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page 3 V/5 V, Rail-to-Rail Quad, 8-Bit DAC AD7304/AD7305 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 © 2004 Analog Devices, Inc. All rights reserved. FEATURES Four 8-bit DACs in one package +3 V, +5 V, and ±5 V operation Rail-to-rail REF input to voltage output swing 2.6 MHz reference multiplying bandwidth Internal power-on reset SPI serial interface-compatible—AD7304 Fast parallel interface—AD7305 40 µA power shutdown APPLICATIONS Automotive output span voltage Instrumentation, digitally controlled calibration Pin-compatible AD7226 replacement when VDD < 5.5 V GENERAL DESCRIPTION The AD7304/AD73051 are quad, 8-bit DACs that operate from a single +3 V to +5 V supply, or ±5 V supplies. The AD7304 has a serial interface, while the AD7305 has a parallel interface. Internal precision buffers swing rail-to-rail. The reference input range includes both supply rails, allowing for positive or negative full-scale output voltages. Operation is guaranteed over the supply voltage range of 2.7 V to 5.5 V, consuming less than 9 mW from a 3 V supply. The full-scale voltage output is determined by the external reference input voltage applied. The rail-to-rail VREF input to DAC VOUT allows for a full-scale voltage set equal to the positive supply, VDD, the negative supply, VSS, or any value in between. The AD7304’s doubled-buffered serial data interface offers high speed, 3-wire, SPI®-, and microcontroller-compatible inputs using data in (SDI), clock (CLK), and chip select (CS) pins. Additionally, an internal power-on reset sets the output to zero scale. The parallel input AD7305 uses a standard address decode along with the WR control line to load data into the input registers. The double-buffered architecture allows all four input registers to be preloaded with new values, followed by an LDAC control strobe that copies all the new data into the DAC registers, thereby updating the analog output values. _____________________________________________________ 1 Protected under Patent No. 5684481. FUNCTIONAL BLOCK DIAGRAMS CS PWR-ON RESET VSS AD7304 VOUTA INPUT REG A DAC A LDAC SDI/SHDN GND CLK 8 8 8 8 DAC A REG DAC B 8 8 8 8 8 DAC D DAC C SERIAL REG VREFB VREFA CLR VREFCVREFD VDD VOUTB VOUTC VOUTD INPUT REG B DAC B REG INPUT REG C DAC C REG INPUT REG D DAC D REG Figure 1. PWR-ON RESET AD7305 VOUTA INPUT REG A DAC A LDAC 8 8 8 8 DAC A REG DAC B 8 8 8 8 8 DAC D DAC C DECODE VREF VSS GND VDD VOUTB VOUTC VOUTD INPUT REG B DAC B REG INPUT REG C DAC C REG INPUT REG D DAC D REG DB0 DB1 DB2 DB3 DB4 DB5 DB6 8 WR A0/SHDN A1 Figure 2. When operating from less than 5.5 V, the AD7305 is pin-compatible with the popular industry-standard AD7226. An internal power-on reset places both parts in the zero-scale state at turn-on. A 40 µA power shutdown (SHDN) feature is activated on both parts by three-stating the SDI/SHDN pin on the AD7304 and three-stating the A0/SHDN address pin on the AD7305. The AD7304/AD7305 are specified over the extended industrial −40°C to +85°C and the automotive −40°C to +125°C temperature ranges. AD7304s are available in a wide-body 16-lead SOIC (R-16) package. The parallel input AD7305 is available in the wide-body 20-lead SOIC (R-20) surface-mount package. For ultracompact applications, the thin 1.1 mm, 16-lead TSSOP (RU-16) package is available for the AD7304, while the 20-lead TSSOP (RU-20) houses the AD7305. |
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