TLE4941-2 datasheet(8/8 Pages) INFINEON

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TLE4941-2, TLE4941-2C Supplement

TLE4941-2 - TLE4941-2C

February 2002

Datasheet supplement

Appendix B Release 1.0

1. Occurrence of initial calibration delay time td,input

Identical to TLE4941, TLE4941C appendix B.

2. Magnetic input signal extremely close to a PGA switching threshold during signal

start-up:

After signal start-up normally all PGA switching into the appropriate gain state happens

within less than one signal period. This is included in the calculation for nDZ-Startup. For the very

rare case that the signal amplitude is extremely close to a switching threshold of the PGA

and the full range of the following speed ADC respectively, a slight change of the signal

amplitude can cause one further PGA switching. It can be caused by non-perfect magnetic

signal (amplitude modulation due to tolerances of polewheel, tooth wheel or air gap

variation). This additional PGA switching can result in a further delay of the output signal (nDZ-

Startup) up to three magnetic edges leading to a worst case of nDZ-Start=9 and nDR-Startup=11.

However, the speed signal start-up, comprised of nDR-Startup and td,input is not affected by this

behaviour for TLE4941-2.

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