IC-NQL Datasheet, PDF (2/24 Pages) IC-Haus GmbH – 13-bit Sin/D CONVERTER WITH SSI INTERFACE

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.