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MAX1494 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1494 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 35 page General Description The MAX1492/MAX1494 low-power, 3.5- and 4.5-digit, analog-to-digital converters (ADCs) with integrated liquid crystal display (LCD) drivers operate from a single 2.7V to 5.25V power supply. They include an internal refer- ence, a high-accuracy on-chip oscillator, and a triplexed LCD driver. An internal charge pump generates the neg- ative supply needed to power the integrated input buffer for single-supply operation. The ADC is configurable for either a ±2V or ±200mV input range and outputs its con- version results to an LCD and/or to a microcontroller (µC). µC communication is facilitated through an SPI™-/QSPI™-/MICROWIRE™-compatible serial inter- face. The MAX1492 is a 3.5-digit (±1999 count) device, and the MAX1494 is a 4.5-digit (±19,999 count) device. The MAX1492/MAX1494 do not require external-preci- sion integrating capacitors, autozero capacitors, crystal oscillators, charge pumps, or other circuitry required with dual-slope ADCs (commonly used in panel meter circuits). These devices also feature on-chip buffers for the dif- ferential signal and reference inputs, allowing direct interface with high-impedance signal sources. In addi- tion, they use continuous internal-offset calibration and offer >100dB simultaneous rejection of 50Hz and 60Hz line noise. Other features include data hold and peak hold, overrange and underrange detection, and a low- battery monitor. The MAX1494 comes in a 32-pin, 7mm x 7mm TQFP package, and the MAX1492 comes in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the 0°C to +70°C commercial temperature range. Applications Digital Panel Meters Hand-Held Meters Digital Voltmeters Digital Multimeters Features o High Resolution MAX1494: 4.5 Digits (±19,999 Count) MAX1492: 3.5 Digits (±1999 Count) o Sigma-Delta ADC Architecture No Integrating Capacitors Required No Autozeroing Capacitors Required >100dB of Simultaneous 50Hz and 60Hz Rejection o Operate from a Single 2.7V or 5.25V Supply o Selectable Input Range of ±200mV or ±2V o Selectable Voltage Reference: Internal 2.048V or External o Internal High-Accuracy Oscillator Needs No External Components o Automatic Offset Calibration o Low Power Maximum 960µA Operating Current Maximum 400µA Shutdown Current o Small 32-Pin 7mm x 7mm TQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits) o Triplexed LCD Driver o SPI-/QSPI-/MICROWIRE-Compatible Serial Interface o Evaluation Kit Available (Order MAX1494EVKIT) 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-2959; Rev 3; 5/04 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE PART TEMP RANGE PIN- PACKAGE RESOLUTION (DIGITS) MAX1492CAI 0 °C to +70°C 28 SSOP 3.5 MAX1492CNI 0 °C to +70°C 28 PDIP 3.5 MAX1494CCJ 0 °C to +70°C 32 TQFP 4.5 SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Pin Configurations appear at end of data sheet. |
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