MAX1492, MAX1494 3.5- And 4.5-Digit, Single-Chip ADCs With LCD Drivers

The MAX1492 MAX1494 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 outputs its conversion results to an LCD and/or to a Microcontroller (C). C Communication is facilitated through an SPI-/QSPI-/MICROWIRE-compatible serial Interface The MAX1492 is a 3.5-digit (1999 count) device, and the MAX1494 is a 4.5-digit (19,999 count) device.
The MAX1492 MAX1494 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 simultaneous rejection of 50Hz and 60Hz line noise. Other features include data hold and peak hold, overrange and underrange detection, and a lowbattery monitor.
The MAX1494 comes in a 32-pin, 7mm x 7mm TQFP package, and the MAX1492 comes in 28-pin SSOP and 28-pin PDIP packages. All devices in this family operate over the 0C to +70C commercial temperature range.
By Maxim Integrated Products