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A CMOS 8-bit analogue to digital converter with output latches that can directly drive a microprocessor data bus. The IC looks like a memory location or I/O port to the microprocessor so no interfacing logic is required. The analogue input voltage range is 0V to 5V with a single 5V supply, and 2· 5V applied to pin 9. However, the voltage reference on 9 can be any voltage under 2· 5V so that any voltage span can be converted with a full 8 bits of resolution. In addition, by connecting pin 7 to a voltage other than ground, the span need not start at 0V. For example if the span was 0· 5V to 3· 5V (a span of 3V) 0· 5V would be applied to pin 7 and 1· 5V to pin 9 (i.e.  of 3V). No zero adjustment is needed with this IC. |
| Supply voltage: |
+5V (VCC) |
| at pin 9: |
1· 3k |
| voltage range: |
Ground to VCC |
| Conversion rate: |
8770/second max. |
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