The LM12454/LM12458/LM12H458 12-Bit + Sign Data Acquisition System with Self-Calibration is a highly integrated data acquisition system produced by TI. It operates on just 5V and combines a fully-differential self-calibrating (correcting linearity and zero errors) 13-bit (12-bit + sign) analog-to-digital converter (ADC) and sample-and-hold (S/H) with extensive analog functions and digital functionality.
The LM12454, LM12458, and LM12H458 are highly integrated 12‑bit + sign data acquisition systems that operate from a single 5 V supply. They combine a fully‑differential self‑calibrating ADC, sample‑and‑hold, extensive analog functions, and a digital interface with FIFO storage and DMA support. The devices support up to 32 consecutive conversions and include an eight‑channel multiplexer for the LM12(H)458 variants.
Key specifications include 12‑bit + sign or 8‑bit + sign resolution, sample rates of 88 k‑140 k samples per second, power consumption as low as 30 mW, and a single‑supply range of 3 V to 5.5 V. The manual provides ordering information, functional diagrams, absolute maximum ratings, converter characteristics, and detailed digital timing specifications.
| Resolution | 12-bit + sign or 8-bit + sign |
|---|---|
| Sample Rate | 88 k‑140 k samples/s (min) |
| Power Consumption | 30 mW (typ), 34 mW (max) |
| Supply Voltage | 3 V to 5.5 V (single supply) |
| Analog Input Voltage Range | -0.3 V to (V* + 0.3 V) |
The maximum supply voltage is 6.0 V.
Stand‑by mode consumes about 50 pW (typ).
The device supports three modes: 12‑bit + sign, 8‑bit + sign, and watchdog mode.
The internal reference output voltage is 2.5 V (max).