The TC826 is a complete analog-to-digital converter with direct liquid crystal (LCD) display drive. The 40 LCD data segments plus zero driver give a 2.5% resolution bar display. Full scale differential input voltage range extends from 20mV to 2V. The TC826 sensitivity is 500V. A low drift 35ppm/C internal reference, LCD backplane oscillator and driver, input polarity LCD driver, and over range LCD driver make designs simple and low cost. The CMOS design required only 125A from a 9V battery. In +5V systems, a TC7660 DC to DC converter can supply the -5V supply. The differential analog input leakage is a low 10pA. Two display formats are possible. The BAR mode display is like a `thermometer' scale. The LCD segment driver that equals the input, plus all below it are on. The DOT mode activates only the segment equal to the input. In either mode, the polarity signal is active for negative input signals. An over range input signal causes the display to flash and activates the over range annunciator. A HOLD mode can be selected that freezes the display and prevents updating. The dual slope integrating conversion method with auto-zero phase maximizes noise immunity and eliminates zero scale adjustment potentiometers. Zero scale drift is a low 5V/C. Conversion rate is typically 5 per second and is adjustable by a single external resistor.