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AD7224LN Datasheet(PDF) 1 Page - Analog Devices |
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AD7224LN Datasheet(HTML) 1 Page - Analog Devices |
1 / 8 page REV. B 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 LC2MOS 8-Bit DAC with Output Amplifiers AD7224 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FUNCTIONAL BLOCK DIAGRAM FEATURES 8-Bit CMOS DAC with Output Amplifiers Operates with Single or Dual Supplies Low Total Unadjusted Error: Less Than 1 LSB Over Temperature Extended Temperature Range Operation P-Compatible with Double Buffered Inputs Standard 18-Pin DIPs, and 20-Terminal Surface Mount Package and SOIC Package PRODUCT HIGHLIGHTS 1. DAC and Amplifier on CMOS Chip The single-chip design of the 8-bit DAC and output amplifier is inherently more reliable than multi-chip designs. CMOS fabrication means low power consumption (35 mW typical with single supply). 2. Low Total Unadjusted Error The fabrication of the AD7224 on Analog Devices Linear Compatible CMOS (LC 2MOS) process coupled with a novel DAC switch-pair arrangement, enables an excellent total un- adjusted error of less than 1 LSB over the full operating tem- perature range. 3. Single or Dual Supply Operation The voltage-mode configuration of the AD7224 allows opera- tion from a single power supply rail. The part can also be op- erated with dual supplies giving enhanced performance for some parameters. 4. Versatile Interface Logic The high speed logic allows direct interfacing to most micro- processors. Additionally, the double buffered interface en- ables simultaneous update of the AD7224 in multiple DAC systems. The part also features a zero override function. GENERAL DESCRIPTION The AD7224 is a precision 8-bit voltage-output, digital-to- analog converter, with output amplifier and double buffered interface logic on a monolithic CMOS chip. No external trims are required to achieve full specified performance for the part. The double buffered interface logic consists of two 8-bit regis- ters–an input register and a DAC register. Only the data held in the DAC registers determines the analog output of the con- verter. The double buffering allows simultaneous update in a system containing multiple AD7224s. Both registers may be made transparent under control of three external lines, CS, WR and LDAC. With both registers transparent, the RESET line functions like a zero override; a useful function for system cali- bration cycles. All logic inputs are TTL and CMOS (5 V) level compatible and the control logic is speed compatible with most 8-bit microprocessors. Specified performance is guaranteed for input reference voltages from +2 V to +12.5 V when using dual supplies. The part is also specified for single supply operation using a reference of +10 V. The output amplifier is capable of developing +10 V across a 2 k Ω load. The AD7224 is fabricated in an all ion-implanted high speed Linear Compatible CMOS (LC 2MOS) process which has been specifically developed to allow high speed digital logic circuits and precision analog circuits to be integrated on the same chip. |
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