The Intersil HI-7159A is a monolithic A/D converter that uses a unique dual slope technique which allows it to resolve input changes as small as 1 part in 200,000 (10µV) without the use of critical external components. Its digital autozeroing feature virtually eliminates zero drift over temperature. The device is fabricated in Intersil’ proprietary low noise BiMOS process, resulting in exceptional linearity and noise performance. The HI-7159A’s resolution can be switched between a high resolution 200,000 count (5-1/2 digit) mode, and a high speed 20,000 count (4-1/2 digit) mode without any hardware modifications. In the 4-1/2 digit uncompensated mode, speeds of 60 conversions per second can be achieved. The HI-7159A is designed to be easily interfaced with most microprocessors through either of its three serial and one parallel interface modes. In the serial modes, any one of four common baud rates is available.
The Intersil HI-7159A is a monolithic analog-to-digital (A/D) converter utilizing a unique dual slope technique. It resolves input changes as small as 1 part in 200,000 without critical external components and features digital autozeroing to eliminate zero drift over temperature. The device operates in two modes: high resolution at 200,000 counts or high speed at 20,000 counts.
| Resolution (Compensated Mode) | 200,000 Count |
|---|---|
| Full Scale Reading | 2V |
| Resolution (Uncompensated Mode) | 10uV |
| Conversion Speed (5 1/2 Digit Mode) | 15 Conversions Per Second |
| Conversion Speed (4 1/2 Digit Mode) | 60 Conversions Per Second |
| Operating Temperature Range | 0°C to 70°C |
The device is suitable for weighing scales, part counting scales, laboratory instruments, process control/monitoring, energy management, and seismic monitoring.
Four selectable baud rates (300, 1200, 9600, and 19200) are available via digital pins P6/BRS0 and P7/BRS1.
The device requires a Vcc of +4.75V to +5.50V and a Vee of -4.75V to -5.50V.