The ADC12048 is a 12-bit + sign, parallel I/O, self-calibrating, sampling analog-to-digital converter (ADC) with an eight input fully isdifferential analog multiplexer manufactured by National Semiconductor. It has a maximum sampling rate of 216 kHz and can be self-calibrated for linearity, zero and full-scale errors. The ADC12048's 8-channel multiplexer is software program- mable to operate in a variety of combinations of single-ended, differential, or pseudo-differential modes. The fully differential MUX and the 12-bit + sign ADC allows for the difference between two signals to be digitized. The ADC12048 can be configured to work with many popular microprocessors/microcontrollers and DSPs including Na- tional's HPC family, Intel386 and 8051, TMS320C25, Mo- torola MC68HC11/16, Hitachi 64180 and Analog Devices ADSP21xx. For complementary voltage references see the LM4040, LM4041 or LM9140.
The ADC12048 is a 12‑bit plus sign, 8‑channel sampling analog‑to‑digital converter that operates from a single 5 V supply. It offers programmable data bus widths, built‑in sample‑and‑hold, and self‑calibration features, supporting single‑ended, differential, or pseudo‑differential input modes.
The document provides detailed pin descriptions, absolute maximum ratings, electrical characteristics, power‑supply specifications, timing diagrams, and mechanical dimensions for both PLCC and PQFP packages.
| Resolution | 13 bits (max, no missing codes) |
|---|---|
| Supply Voltage Range | +5 V ±10 % |
| Normal Operation Power Consumption | 34 mW (max) |
It operates from a single 5 V supply with a tolerance of ±10 %.
Pin 11 (AGND) is the analog ground pin.
WMODE determines which edge of the WR signal latches data at power‑up; low selects rising edge, high selects falling edge.