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| A/D CONVERTERS ANALOG Data Sheets * Applications Notes * DESIGN GUIDE Free Samples 7 ION EDIT 22nd World's Smallest 31/2- and 41/2Digit ADCs with LCD Display Driver Compared with earlier panel-meter ADC solutions, Maxim's new sigma-delta-based panel-meter ICs provide higher integration and performance in a tiny 7mm x 7mm TQFP. Eliminating the need for an external precision integrating capacitor, auto-zeroing capacitor, and external clock source, they provide >100dB of 50Hz/60Hz noise rejection using a single 2.7V to 5.25V supply. An internal 2.048V, 20ppm/C reference further reduces the external component count. Optional SPITM /QSPITM /MICROWIRETM allows the result to be processed by a C before outputting to the display. W LO LD HO AK PE TT BA C1 NO EXTERNAL REFERENCE REQUIRED >100dB SIMULTANEOUS 50Hz/60Hz REJECTION AL XT 1 C2 S AL DU V PE LO t 9 12 L 7 D IP IC 0 4 F REREF CAPACITOR NO EXTERNAL CRYSTAL REQUIRED m x 7m * Eliminates Integrating/ Auto-Zero Capacitors * 2.7V to 5.25V SingleSupply Operation * Up to 10x Footprint Reduction Part MAX1491* MAX1492* MAX1493* MAX1494* Display LCD LCD LCD LCD Digits 31/2 31/2 41/2 41/2 * SPI/QSPI/MICROWIRE Interface (MAX1491/1494) Allows Measurements to Be Processed Using a C Resolution (Count) 1999 1999 19999 19999 Interface Serial Stand-Alone Serial Stand-Alone Pin-Package 28-TSSOP 28-TSSOP 32-TQFP 32-TQFP *Future product--contact factory for availability. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. is a registered trademark of Maxim Integrated Products, Inc. (c) 2002 Maxim Integrated Products. m E -V E INTEGRATING 32 AUTO-ZERO CAPACITOR COMPLETE PANEL-METER SOLUTION USING SIGMA-DELTA ARCHITECTURE 01 11 10 11 10 1 10 01 11 1 10 -PIN TQ FP m 7 |
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