IC-NQL datasheet(2/24 Pages) ICHAUS

2 / 24 page

iC-NQL

13-bit Sin/D CONVERTER WITH SSI INTERFACE

Rev B1, Page 2/24

DESCRIPTION

iC-NQL is a monolithic A/D converter which, by ap-

plying a count-safe vector follower principle, converts

sine/cosine sensor signals with a selectable resolu-

tion and hysteresis into angle position data.

This

absolute value is output via a synchronous-serial

SSI interface and trails a master clock rate of up to

4 Mbit/s. A 8-bit period counter supplements the po-

sition data with a multiturn count.

At the same time any changes in output data are

converted into incremental A QUAD B encoder sig-

nals. Here, the minimum transition distance can be

adapted to suit the system on hand (cable length, ex-

ternal counter). A synchronised zero index is gener-

ated and output to Z if enabled by the PZERO and

NZERO inputs.

The front-end ampliﬁers are conﬁgured as instrumen-

tation ampliﬁers, permitting sensor bridges to be di-

rectly connected without the need for external resis-

tors. Various programmable D/A converters are avail-

able for the conditioning of sine/cosine sensor sig-

nals with regard to offset, amplitude ratio and phase

errors. Front-end gain can be set in stages graded

to suit all common differential sensor signals from

approximately 20 mVpp to 1.5 Vpp, and also single-

ended sensor signals from 40 mVpp to 3 Vpp respec-

tively.

The device reads its conﬁguration data via the serial

EEPROM interface when cycling power, respectively

following an undervoltage reset. The read in cycle

is repeated up to three times when data correctness

is not conﬁrmed by a CRC validation. A permanent

CRC error as well as the conﬁguration phase itself

is displayed at the error message output NERR by a

low level signal.

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