MC14443

MC14443 is a kind of 6-channel, single-slope, 8-10 bit analog-to-digital converter linear subsystem for microprocessor-based data and control systems. The MC14443 contains a one-of-8 decoder, an 8-channel analog multiplexer, a buffer amplifier, a precision voltage-to-current, a ramp start circuit and a comparator. The output driver of the MC14443 comparator is an open-drain N-channel which provides a sinking current. A processor system provides the addressing, timing, counting and arithmetic operations required for implementing a full analog-to-digital converter system. A system made up of a processor and the linear subsystem has features such as automatic zeroing and variable scaling of six seperate analog channels.

There are some features of MC14443 as follows. First is quiescent current 0.8 mA typical at VDD=5 V. The second is single supply operation +4.5 to +18 V. Then is direct interface to CMOS MPUs. Next is typical resolution which is 8 bits. The fifth is typical conversion cycle as fast as 300s. Besides, ratiometric conversion minimizes error. The seventh is analog input voltage range which is from VSS to VDD-2 V. The last one is chip complexity which is 150 FETs.

What comes next is about the maximum ratings of MC14443 (voltage reference to VSS). The VDD (DC supply voltage) is from -0.5 to +18 V. The VIN (input voltage, all inputs) is from -0.5 to VDD+0.5 V. The IIN (DC input current, per pin) is ±10 mA. The TA (operating temperature range) is from -40 to +85. The Tstg (storage temperature range) is from -65 to +150.