MAX1491
3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers
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3.5- and 4.5-Digit ADC, LED Display Drivers Reduce Time and Save Board Space
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Features
- High Resolution
- MAX1495: 4.5 Digits (±19,999 Count)
- MAX1493: 4.5 Digits (±19,999 Count)
- MAX1491: 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 980µA Operating Current
- Small 32-Pin 7mm x 7mm TQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits), and 28-Pin DIP Package (3.5 Digits)
- Triplexed LCD Driver
- Evaluation Kit Available (Order MAX1494EVKIT)
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The MAX1491/MAX1493/MAX1495 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 ADC is configurable for either a ±2V or ±200mV input range and it outputs its conversion results to an LCD. The MAX1491 is a 3.5-digit (±1999 count) device, and the MAX1493/MAX1495 are 4.5-digit (±19,999 count) devices.
The MAX1491/MAX1493/MAX1495 do not require external-precision integrating or auto-zero 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, the MAX1491/MAX1493/MAX1495 use continuous internal offset calibration, and offer >100dB rejection of 50Hz and 60Hz line noise. The MAX1493/MAX1495 perform enhanced offset calibration at power-up. The MAX1495 also performs enhanced calibration on demand. Other features include data hold and peak hold, and a user programmable low-battery monitor.
The MAX1493/MAX1495 come in a 32-pin 7mm x 7mm TQFP package, and the MAX1491 comes in 28-pin SSOP and 28-pin DIP 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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MAX1491
Documentation
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Documentation
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.
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SamacSys
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3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface |
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3.5- and 4.5-Digit, Single-Chip ADCs with LCD 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
MAX1493EVKIT
Evaluation Kit for the MAX1493 and MAX1495
Product Detail
The MAX1493 is a low-power, 4.5-digit analog-to-digital converter (ADC) with integrated liquid-crystal display (LCD) drivers.
The MAX1493 evaluation kit (EV kit) provides a proven printed-circuit board (PCB) layout to facilitate evaluation of the MAX1493 IC. Connect the 4V to 28V DC and ground return to terminal block TB1 (see Figure 1 in the full data sheet).
The EV kit is not a complete digital voltmeter (DVM); additional input scaling and protection circuitry might be required.
This EV kit can also evaluate the MAX1495CCJ+. Contact the factory for free samples. See the Evaluating the MAX1495 section in the full data sheet for additional information.
Applications
- Digital Multimeters
- Digital Panel Meters
- Digital Voltmeters
- Handheld meters