iC-WT

iC-WT INCREMENTAL ENCODER FEATURES ♦ Differential scanning for track A and B ♦ Constant-light-evaluated scanning for the index track Z with adjustable relative threshold ♦ Photocurrent amplifier with high cut-off frequency ♦ Current comparators with hysteresis ♦ Index track Z selectable gated by tracks A and B ♦ Current-limited and short-circuit-proof push-pull outputs ♦ Outputs TTL compatible ♦ Adjustable LED current control for constant optical receiver power ♦ Integrated 50mA driver for the transmit LED ♦ LED current monitoring and error message upon violating the control range ♦ Low current consumption from single 5V power supply ◊ Option: enhanced temperature range -40..125°C APPLICATIONS ♦ Photocurrent evaluation for incremental linear or angular position measuring systems PACKAGES SO16N BLOCK DIAGRAM +5V LED CODEWHEEL PHOTODIODES ARRAY 14 DPA DPA 15 DNA DNA 12 DPB DPB 13 DNB DNB iC-OR CLR 10nF 11 DZ DZ RLR RZ 15kΩ 15kΩ 8 10 9 16 CLR ILR IZ AGND 2 VCC A3 TRACK A +5V OUT_A B4 TRACK B iC-WT Z5 ERROR TRACK Z NERR 6 LED LED 7 LED CURRENT CONTROL GND 1 DRIVER OUT_B OUT_Z ERROR RLED 68Ω ©1997 iC-Haus GmbH Integrated Circuits Am Kuemmerling 18, D-55294 Bodenheim Rev A0 Tel +49-6135-9292-0 Fax +49-6135-9292-192 http://www.ichaus.com iC-WT INCREMENTAL ENCODER Rev A0, Page 2/13 DESCRIPTION The device iC-WT is an evaluator IC for optical increment linear and rotary motion sensors, e.g. glass scales or shaft encoders. A photodiodes array supplies ...