MAX1491
PRODUCTION3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers
3.5- and 4.5-Digit ADC, LED Display Drivers Reduce Time and Save Board Space
- Part Models
- 1
- 1ku List Price
- Starting From $7.19
Part Details
- 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)
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
Documentation
Data Sheet 1
Design Note 2
Technical Articles 1
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 |
|---|---|---|---|
| MAX1491CAI+ | 28-SSOP-5.3_MM |
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Display Driver Electronics 4 | ||
| MAX1499 | PRODUCTION | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface |
| MAX1494 | PRODUCTION | 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers |
| MAX1496 | PRODUCTION | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers |
| MAX1498 | PRODUCTION | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers |
| Product 3 | ||
| MAX1447 | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers | |
| MAX1492 | 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers | |
| MAX1497 | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and µC Interface | |
Evaluation Kits
Evaluation Kit for the MAX1493 and MAX1495
Latest Discussions
No discussions on max1491 yet. Have something to say?
Start a Discussion on EngineerZone®