TC7126A

Supply Voltage (V+ to V-) ......................................... 15V
Analog Input Voltage (either Input) (Note 1) ... V+ to VReference
Input Voltage (either Input) ..................... V+ to VClock
Input .............................................................. Test to V+
Package Power Dissipation (TA  70°C) (Note 2):
44-Pin PQFP..........................................................1.00W
40-Pin PLCC..........................................................1.23W
44-Pin PDIP ..........................................................1.23W
Operating Temperature Range:
C (Commercial) Devices.......................... 0°C to +70°C
I (Industrial) Devices .......................... -25°C to +85°C
Storage Temperature Range.............. -65°C to +150°C

The TC7126A is a 3-1/2 digit CMOS analog-to-digital converter (ADC) containing all the active components necessary to construct a 0.05% resolution measurement system. Seven-segment decoders, digit and polarity drivers, voltage reference, and clock circuit are ntegrated on-chip. The TC7126A directly drives a liquid crystal display (LCD), and includes a backplane driver.

A low cost, high resolution indicating meter requires only a display, four resistors, and four capacitors. The TC7126A's extremely low power drain and 9V battery operation make it ideal for portable applications.

The TC7126A reduces linearity error to less than 1 count. Rollover error (the difference in readings for equal magnitude, but opposite polarity input signals) is below ±1 count. High-impedance differential inputs offer 1pA leakage current and a 1012Ω input impedance.The 15µVP-P noise performance ensures a "rock solid" reading,and the auto-zero cycle ensures a zero display reading with a 0V input.