TC7135

Positive Supply Voltage.................................................+6V
Negative Supply Voltage ........................................... - 9V
Analog Input Voltage (Pin 9 or 10) .........V+ to V- (Note 2)
Reference Input Voltage (Pin 2) ...................... V+ to VClock
Input Voltage ....................................................... 0V to V+
Operating Temperature Range ..................0°C to +70°C
Storage Temperature Range.............. 65°C to +150°C
Package Power Dissipation; (TA  70°C)
28-Pin PDIP .............................................................. 1.14Ω
28-Pin PLCC ............................................................ 1.00Ω
64-Pin PQFP..............................................................1.14Ω

The TC7135 4-1/2 digit A/D converter (ADC) offers 50ppm (1 part in 20,000) resolution with a maximum nonlinearity error of 1 count. An auto zero cycle reduces zero error to below 10µV and zero drift to 0.5µV/°C. Source impedance errors are minimized by a 10pA maximum input current. Rollover error is limited to ±1 count.

Microprocessor based measurement systems of the TC7135 are supported by BUSY, STROBE and RUN/HOLD control signals. Remote data acquisition systems with data transfer via UARTs are also possible. The additional control pins and multiplexed BCD outputs make the TC7135 the ideal converter for display or microprocessor based measurement systems.