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Features
- High Resolution
- MAX1494: 4.5 Digits (±19,999 Count)
- MAX1492: 3.5 Digits (±1999 Count)
- Sigma-Delta ADC Architecture
- No Integrating Capacitors Required
- No Autozeroing Capacitors Required
- > 100dB of Simultaneous 50Hz and 60Hz Rejection
- Operate from a Single 2.7V or 5.25V Supply
- Selectable Input Range of ±200mV or ±2V
- Selectable Voltage Reference: Internal 2.048V or External
- Internal High-Accuracy Oscillator Needs No External Components
- Automatic Offset Calibration
- Low Power
- Maximum 960µA Operating Current
- Maximum 400µA Shutdown Current
- Small 32-Pin 7mm x 7mm LQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits)
- Triplexed LCD Driver
- SPI-/QSPI-/MICROWIRE-Compatible Serial Interface
- Evaluation Kit Available (Order MAX1494EVKIT)
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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 reference, a high-accuracy on-chip oscillator, and a triplexed LCD driver. An internal charge pump generates the negative supply needed to power the integrated input buffer for single-supply operation. The ADCs are configurable for either a ±2V or ±200mV input range and outputs its conversion results to an LCD and/or to a microcontroller (µC). µC communication is facilitated through an SPI™-/QSPI™-/MICROWIRE®-compatible serial interface. 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-precision 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 differential signal and reference inputs, allowing direct interface with high-impedance signal sources. In addition, 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 LQFP 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 Multimeters
- Digital Panel Meters
- Digital Voltmeters
- Handheld meters
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MAX1494
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MAX1492-MAX1494: 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers Data Sheet (Rev.4)
MAX1492-MAX1494_cn: 3位半和4位半、单片ADC，带有LCD驱动器 Data Sheet (Rev.4)
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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
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Product Lifecycle
PCN
Nov 29, 2021
- 2218F
ASSEMBLY
MAX1494CCJ+
PRODUCTION
Filter by Model
Part Models
Product Lifecycle
PCN
Nov 29, 2021
- 2218F
ASSEMBLY
Software & Part Ecosystem
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3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers |
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3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface |
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Evaluation Kits 1
MAX1494EVKIT
Evaluation Kit/Evaluation System for the MAX1493, MAX1494, and MAX1495
Product Detail
The MAX1494 evaluation system (EV system) consists of a MAX1494 evaluation kit (EV kit) and a Maxim 68HC16MODULE-DIP microcontroller (µC) module. The MAX1494 is a low-power, 4.5-digit, analog-to-digital converter (ADC) with integrated liquid crystal display (LCD) drivers. The evaluation software runs under Windows® 95/98/2000/XP, providing a user interface to exercise the features of the MAX1494.
Order the complete EV system (MAX1494EVC16) for a comprehensive evaluation of the MAX1494 using a personal computer. Order the EV kit (MAX1494EVKIT) if the 68HC16MODULE-DIP module has been purchased with a previous Maxim EV system, or for custom use in other µC-based systems.
This system can also evaluate the MAX1493CCJ and MAX1495CCJ. Contact the factory for free samples of these products. See the Detailed Description of Hardware section.
Applications
- Digital Multimeters
- Digital Panel Meters
- Digital Voltmeters
- Handheld meters
Tools & Simulations 1
Software Development 1
