Siliconix LD121A
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The Siliconix LD121A (P/N 156-1305-00) is a 4½ digit integrating ADC (digital section) monolithic integrated circuit in an 18-pin DIP.
Used in
- 7A13 (S/N B0250000 and up, U636, with Siliconix LD122 analog front-end, U637)
- DM501A (A10U1603, with Siliconix LD120 analog front-end)
- PS5004 (U2092, with Siliconix LD120 analog front-end)
Some instruments using part Siliconix LD121A
| Instrument | Manufacturer | Class | Description | Introduced |
|---|---|---|---|---|
| 7A13 | Tektronix | Plug-in | 100 MHz differential comparator | 1969 |
| DM501A | Tektronix | Plug-in | 4½ digit True RMS multimeter | 1979 |
| PS5004 | Tektronix | Plug-in | programmable precision power supply | 1984 |
Data
- Siliconix LD120 and LD121A datasheets
- Tek Component News 256, January-February 1978:
The LD 120/LD121 converter set will cost approximately $15.00 [$75 in 2026 dollars] in 1000 lot quantities, and should be considered for applications involving 4½ digit DVM systems. - See also Siliconix LD120