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AD7304BN Datasheet(PDF) 1 Page - Analog Devices |
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AD7304BN Datasheet(HTML) 1 Page - Analog Devices |
1 / 14 page 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 AD7304/AD7305* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998 FUNCTIONAL BLOCK DIAGRAMS PWR ON RESET VSS AD7304 VOUTA VOUTB INPUT REG A DAC A CS LDAC SDI/SHDN GND CLK 8 8 8 8 DAC A REG DAC B DAC B REG INPUT REG B 8 INPUT REG C 8 8 8 8 DAC C REG DAC D DAC D REG INPUT REG D DAC C SERIAL REG VREFB VREFA VOUTC VOUTD CLR VREFCVREFD VDD PWR ON RESET VSS VOUTA VOUTB INPUT REG A DAC A WR LDAC A0/SHDN GND A1 8 8 8 8 DAC A REG DAC B DAC B REG 8 8 8 8 8 DAC C REG DAC D DAC D REG DAC C VREF VOUTC VOUTD VDD INPUT REG B INPUT REG C INPUT REG D DECODE DB0 DB1 DB2 DB3 DB4 DB5 DB6 AD7305 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 Compact 1.1 mm Height TSSOP 16-/20-Lead Package Internal Power ON Reset SPI Serial Interface Compatible—AD7304 Fast Parallel Interface—AD7305 40 A Power Shutdown APPLICATIONS Automotive Output Span Voltage Instrumentation, Digitally Controlled Calibration Pin-Compatible AD7226 Replacement when VDD < 5.5 V GENERAL DESCRIPTION The AD7304/AD7305 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. Inter- nal 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 refer- ence input voltage applied. The rail-to-rail VREF input to DAC VOUT allows for a full-scale voltage set equal the positive supply VDD, the negative supply VSS or any value in between. The AD7304’s doubled-buffered serial-data interface offers high speed, three-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 regis- ters. The double buffered architecture allows all four input registers to be preloaded with new values, followed by a LDAC control strobe which copies all the new data into the DAC regis- ters thereby updating the analog output values. 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 tristating the SDI/SHDN pin on the AD7304, and tristating 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 16-lead plastic DIP (N-16), and wide-body SOL-16 (R-16) packages. The parallel input AD7305 is available in the 20-lead plastic DIP (N-20), and the SOL-20 (R-20) surface mount package. For ultracompact applications the thin 1.1 mm TSSOP-16 (RU-16) package will be available for the AD7304, while the TSSOP-20 (RU-20) will house the AD7305. *Protected under Patent Number 5684481. +3 V/+5 V, Rail-to-Rail Quad, 8-Bit DAC |
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