TC811

Supply Voltage (V+ to V) ........................................15V
Analog Input voltage (Either Input)1 ................... V+ to V
Reference Input Voltage .................................... V+ to V
Clock Input .................................................... TEST to V+
Power Dissipation2 (TA  70°C)
44-Pin Flat Package ...............................................1.00W
40-Pin Plastic DIP ..................................................1.23W
Operating Temperature Range
Commercial Package (C) ......................... 0°C to +70°C
Industrial Package (I) ........................  25°C to +85°C
Storage Temperature Range ...........  65°C to +150°C
Lead Temperature (Soldering, 10 sec) .............. +300°C


Description

The TC811 is a low power, 3-1/2 digit, LCD display analog-to-digital converter. This device incorporates both a
display hold feature and differential reference inputs. A crystal oscillator, which only requires two pins, permits
added features while retaining a 40-pin package. An additional feature is an "Integrator Output Zero" phase which guarantees rapid input overrange recovery.

The TC811 display hold (HLDR) function can be used to "freeze" the LCD display. The displayed reading will remain indefinitely as long as HLDR is held high. Conversions continue but the output data display latches are not updated. The TC811 also includes a differential reference for easy ratiometric measurements. Circuits which use the 7106/26/36 can easily be upgraded to include the hold function with the TC811.

The TC811 has an improved internal zener reference voltage circuit which maintains the Analog Common temperature drift to 35ppm/°C (typical) and 75ppm/°C (maximum). This represents an improvement of two to four times over similar 3-1/2 digit converters, eliminating the need for costly, space consuming external reference source.