Hi,

New mcu of freescale, LC60 has 12 bit ADC. But the old one LK24 has 10 bit. Can you compare these ADCs for me? Is 12bit adc of LC60 really 12 bit?

What are the errors specified for LC60 below?

Unadjusted Error

Differential Non-Linearity

Integral Non-Linearity

Zero-Scale Error

Full-Scale Error

Quantization Error

Input Leakage Error

Differential Non-Linearity

Integral Non-Linearity

Zero-Scale Error

Full-Scale Error

Quantization Error

Input Leakage Error

Monotonicity and No-Missing-Codes guaranteed in 10 bit and 8 bit modes

10x

LK2410-bit mode: Typical TAE = +/- 6 LSB. These are 12-bit LSBs.LC6010-bit mode: Typical TAE = +/- 4 LSB. These are 12-bit LSBs.LC6012-bit mode: Typical TAE = +/- 3 LSB. These are 12-bit LSBs.LC6012-bit mode is better as much as 1 LSB (12-bit LSBs) thanLC6010-bit mode.LC6010-bit mode is better as much as 2 LSB (12-bit LSBs) thanLK2410-bit mode.According to the data sheet you cannot do this. VrefL must be tied to Vss, and the allowable range of VrefH is 1.8V through to Vdd.

single rangefor each phase. However, it would seem feasible to achieve the required accuracy with both a high range and a low range for each phase, requiring a total of six ADC channels for the current measurements. The analog signal conditioning requirements will consequently be relatively complex, involving multiple rail-to-rail operational amplifiers to provide buffering and level shifting. The block diagram shown shown at your link seems to also imply this method (although I can't seem to display the magnified version of the diagram to see more clearly).