资 源 简 介
The MAX1491/MAX1493/MAX1495 low-power, 3.5- and4.5-digit, analog-to-digital converters (ADCs) with integratedliquid crystal display (LCD) drivers operate from asingle 2.7V to 5.25V power supply. They include an internalreference, a high-accuracy on-chip oscillator, and atriplexed LCD driver. An internal charge pump generatesthe negaTIve supply needed to power the integrated inputbuffer for single supply operaTIon. The ADC is configurablefor either a ±2V or ±200mV input range and it outputsits conversion results to an LCD. The MAX1491 is a3.5-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, crystaloscillators, charge pumps, or other circuitry requiredwith dual slope ADCs (commonly used in panel metercircuits). These devices also feature on-chip buffers forthe differenTIal signal and reference inputs, allowingdirect interface with high-impedance signal sources. Inaddition, the MAX1491/MAX1493/MAX1495 use continuousinternal offset calibration, and offer >100dB rejectionof 50Hz and 60Hz line noise. The MAX1493/MAX1495 perform enhanced offset calibration at powerup.The MAX1495 also performs enhanced calibrationon demand. Other features include data hold and peakhold, and a user programmable low-battery monitor.The MAX1493/MAX1495 come in a 32-pin 7mm ✕ 7mmTQFP package, and the MAX1491 comes in 28-pinSSOP and 28-pin DIP packages. All devices in this familyoperate over the 0°C to +70°C commercial temperaturerange.
