Low-Cost, 2-Channel, ±14-Bit Serial ADCs

The MAX110/MAX111 analog-to-digital converters (ADCs) use an internal auto-calibration technique to achieve 14-bit resolution plus overrange, with no external components. Operating supply current is only 550µA (MAX110) and reduces to 4µA in power-down mode, making these ADCs ideal for high-resolution battery-powered or remote-sensing applications. A fast serial interface simplifies signal routing and opto-isolation, saves microcontroller pins, and offers compatibility with SPI™, QSPI™, and MICROWIRE™. The MAX110 operates with ±5V supplies, and converts differential analog signals in the -3V to +3V range. The MAX111 operates with a single +5V supply and converts differential analog signals in the ±1.5V range, or single-ended signals in the 0V to +1.5V range.

Internal calibration allows for both offset and gain-error correction under microprocessor (µP) control. Both devices are available in space-saving 16-pin DIP and SO packages, as well as an even smaller 20-pin SSOP package.

Applications

* Data Acquisition * Panel Meters * Process Control * Temperature Measurement * Weigh Scales

* Single +5V Supply (MAX111)

* Two Differential Input Channels

* 14-Bit Resolution Plus Sign and Overrange

* 0.03% Linearity (MAX110)

0.05% Linearity (MAX111)

* Low Power Consumption:

* 550µA (MAX110)

* 640µA (MAX111)

* 4µA Shutdown Current

* Up to 50 Conversions/sec

* 50Hz/60Hz Rejection

* Auto-Calibration Mode

* No External Components Required

* 16-Pin DIP/SO, 20-Pin SSOP