DESCRIPTION
discs or scales). The monitor channel is used to drive a constant current source for the highly collimated IR illumination system. Functional DESCRIPTION
Background The 13 signal channels are set up as: 1. Two precision defining signals (A0, A09), which are two 90° electrical shifted sine, cosine signals. These signals are conditioned to be compensated for offset and gain errors. After conditioning they are on-chip interpolated and computed to a combined absolute 16 bit Gray code, together with signal channels A1-A11. 2. 11 analog (A1-A11) channels, which are directly digitized by precision comparators with hysteresis tracking. The digitized signals are called D1-D11. 3. An internal correction and synchronization module allows the composition of a true 16 bit gray code by merging the data bits of (1) and (2) by still keeping the code monotonic. 4. There is a Gray code correction feature for this encoder. This Gray code correction can be disabled/enabled by the pin KORR. 5. The gain and offset conditioning value of the sine and cosine signals are preloaded on-chip by factory.
Avago Technologies
