6-Channel Incremental Opto Encoder Array

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Product Information

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iC-LTA is a versatile optical sensor IC with integrated photosensors whose signals are converted into voltages by low-noise transimpedance amplifiers. Precise voltage comparators with hysteresis are used to generate the digital signals, supplied to the output pins via differential +/- 4mA push-pull drivers.

The built-in LED power control with its 40mA driver stage permits a direct connection of the encoder LED. Regardless of aging or changes in temperature the received optical power is kept constant.

Selection input SEL chooses for three different operating modes: regular A/B operation, A/B operation with 2-fold interpolation, or analog operation. With analog operation the amplified signal voltages are available at the outputs for inspection and monitoring encoder assembly.

The typical application of iC-LTA are incremental encoders for motor feedback and commutation. To this end, iC-LTA provides a differential scanning for the A/B track and the index track Z. The layout of the signal amplifiers is such that there is an excellent paired channel matching, eliminating the needs for signal calibration.

Additionally, three more tracks are provided to generate motor commutation information for the U, V and W outputs, for instance with 120 degree phase shift to operate 3-phase brushless motors (period count and phase shift can be varied by the code disc applied).

iC-Haus IC_LTA_001


• Incremental encoder
• Brushless DC motor commutation
• Industrial drives

Symmetry Electronics (and its e-commerce division: SemiconductorStore.com) is an authorized iC-Haus distributor.


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Monolithic photodiode array with excellent signal matching
Very compact size for small encoders
Moderate track pitch for relaxed assembly tolerances
Low noise signal amplifiers with high EMI tolerance
Single-pin programming of 3 operating modes: analog, digital, and x2 interpolated
Analog signals for alignment and resolution enhancement
Selectable index gating: 1 T, 0.5 T (B-gated), 0.25 T (AB-gated)
Complementary outputs: A, B, Z and NA, NB, NZ
High output frequency for speedy drives and high resolution
U, V,W commutation signals, analog and digital
All outputs +/- 4mA push-pull, current-limited and short-circuit-proof
LED power control with 40mA high-side driver
Single 3.5 V to 5.5V operation, low power consumption
Operating temperature range of -40 C to +110 C (+120 C)
Space saving optoQFN / optoBGA packages (RoHS compliant)
Custom made code disc and reticle designs on request

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