Some graphs that demonstrate the LTC2947’s high accuracy are shown on this slide. The left graph shows that, when measuring the power of 3.3V to 12V supply rails with up to 30A running on them, the total unadjusted error (or TUE) is close to zero percent. Similarly, the second graph shows that, when measuring the energy of a 12V 30A supply using an internal or external clock, the TUE does not typically exceed about 0.25%. Remember, TUE encompasses all of the errors in an ADC, including gain, offset, and INL, and is generally a good indicator of overall measurement performance. Therefore these particularly low TUE figures may ultimately eliminate the need for calibration in some designs.