MAX1497
3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface
3.5- and 4.5-Digit ADC, LED Display Drivers Reduce Time and Save Board Space
Part Details
- High Resolution
- MAX1499: 4.5 Digits (±19,999 Count)
- MAX1497: 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 (Exclude LED Driver Current)
- Maximum 664µA Operating Current
- Maximum 268µA Shutdown Current
- Small 32-Pin, 7mm x 7mm TQFP Package (4.5 Digits), 28-Pin SSOP Package (3.5 Digits)
- Also Available in a PDIP Package (3.5 Digits)
- Multiplexed LED Drivers Resistor-Programmable Segment Current
- SPI-/QSPI-/MICROWIRE-Compatible Serial Interface
- Extended Temperature Range (-40°C to +85°C)
The MAX1497/MAX1499 low-power, 3.5- and 4.5-digit, analog-to-digital converters (ADCs) with integrated lightemitting diode (LED) 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 multiplexed LED display driver. An internal charge pump generates the negative supply needed to power the integrated input buffers for single-supply operation. The ADC is configurable for either a ±2V or ±200mV input range and it outputs its conversion results to an LED and/or to a microcontroller (µC). Microcontroller communication is possible through an SPI™-/QSPI™- /MICROWIRE™-compatible serial interface. The MAX1497 is a 3.5-digit (±1999 count) device and the MAX1499 is a 4.5-digit (±19,999 count) device.
The MAX1497/MAX1499 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 rejection of 50Hz and 60Hz line noise. Other features include data hold and peak detection, overrange and underrange detection, and a user-programmable low-battery monitor.
The MAX1499 is available in a 32-pin, 7mm x 7mm TQFP package and the MAX1497 is available in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the -40°C to +85°C extended temperature range.
Applications
- Digital Multimeters
- Digital Panel Meters
- Digital Voltmeters
- Handheld meters
Documentation
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Display Driver Electronics 2 | ||
| MAX1491 | PRODUCTION | 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers |
| MAX1499 | PRODUCTION | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface |
| Product 1 | ||
| MAX1447 | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers | |
Evaluation Kits
Evaluation Kit/Evaluation System for the MAX1499
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