MAX1498 Low-power, 3.5 and 4.5 digital, analog-to-digital converter (ADC) operation with integrated light-emitting diode (LED) driver from a single 2.7V to 5.25V supply.
Key features:
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High resolution
- MAX1447/MAX1498: 4.5-bit (± 19,999 count)
- MAX1496: 3.5-bit (±1999 count)
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Sigma-ΔADC architecture
- There are no integrated capacitors
- There is no auto-zeroing capacitor
- > 100dB with simultaneous 50Hz and 60Hz rejection
- Selectable input range ± 200mV or ±2V
- Selectable voltage reference: internal 2.048V or external
- Internal high-precision oscillator without external components
- Automatic offset calibration
- On-Demand Enhanced Offset Calibration (MAX1447)
- Operates from a single 2.7V to 5.25V supply
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Low power consumption (excluding LED drive current)
- 744μA Maximum Operating Current (MAX1496)
- 960μA Maximum Operating Current (MAX1447/MAX1498)
- Maximum shut-off current of 325μA
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It also uses a common cathode LED driver
- Resistor programmable segment current
- Small 32-Pin, 7 mm x 7 mm TQFP (4.5-Bit), 28-Pin SSOP (3.5-Bit)
- Also available in PDIP (3.5-bit)
Applications/Uses:
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Digital multimeter
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Digital panel table
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Digital voltmeter
- Handheld instrumentation
description
MAX1447/MAX1496/MAX1498 low-power, 3.5 and 4.5 digital, analog-to-digital converter (ADC) operation with an integrated light-emitting diode (LED) driver from a single 2.7V to 5.25V supply. They include an internal reference, a high-precision on-chip oscillator, and a multiplexed LED display driver. The internal charge pump generates a negative power supply and the power supply is required by the integrated input buffer to power a single supply. The ADC is configured with an input range of ±2V or ±200mV and an LED that outputs the result of its conversion. MAX1496 are 3.5-bit (± 1999 count) devices and MAX1447/MAX1498 are 4.5-bit (± 19,999 count) devices.
In MAX1447/MAX1496/MAX1498, there is no need for external precision integral capacitors, auto-zeroing capacitors, crystal oscillators, charge pumps, or other circuitry required for dual-slope ADCs (commonly used in panel instrumentation circuits).
The devices also feature on-chip buffers, and the differential signal and reference inputs allow for direct interfacing with high-impedance sources. In addition, they use continuous internal offset calibration and provide 100 decibel rejection at 50Hz and 60Hz supply noise. Other features include data hold, peak detection, and over/under range detection. MAX1447 Functional enhancements, offset calibration, offset performance improvements.
The MAX1447/MAX1498 is available in a 32-pin, 7mm x 7mm TQFP package MAX1496 with 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over an extended temperature range of -40°C to +85°C.