High-Speed 12-BIT A/D ICs

National Semiconductor Corporation announced a pair of 12-bit analog-to-digital converters (ADCs) for high-speed, high--resolution imaging applications. ADC 12081 operates at 5MSPS and ADC 12181 at 10MSPS. Both parts deliver linearity (DNL) of 0.35 LSB and 0.40 LSB, respectively; and exceptional performance of 10.5 effective bits at Nyquist sampling rates.

Both ICs use self-calibration and error correction to maintain accuracy and performance over the entire temperature range of 0° C to 70° C. They operate from a 5V power supply and can digitize analog input signals in the range of 0 to 2V. All digital 1/0 is TTL and CMOS compatible to 3V or 5V logic. The ADC 1208 1 /ADC 12181 have input signal sample-and-hold amplifiers and internal reference buffers. The analog input and the reference voltage are converted to differential signals internally, which reduces crosstalk and noise pickup from the digital section and power supply.

The 5MHz device consumes only 105mW typical and the I OMHz part consumes a correspondingly low 235mW while operating at full speed. A power-down standby mode reduces power consumption to 50mW.

National Semiconductor Corporation, 2900, Semiconductor Drive, Santa Clara, CA 95052. Phone: 408-721-5000.