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Analog-digital converter for readout of encoders with SinCos outputs

Encoder systems are among the most common devices for controlling motors

eyADC-DG2 is an analog front end for the evaluation of incremental encoder with sine/cosine outputs. The chip includes two sign comparators which control an internal up-down counter. Additionally, the sine/cosine signals are converted and filtered by continuous time Delta-Sigma ADCs.

The exact angle information obtained by arctan calculation, the raw as well as filtered modulator output data can be accessed via SPI interface. Additionally, an integrated sample rate converter allows the access of the raw data when using an application clock lower then 32MHz.

An LDO, an internal reference voltage generator, and an internal clock generator provide all important functionalities for implementation of the ayADC-DG2 into application.

2 Delta-Sigma ADCs
2 Sign Comperators
Up-Down Counter
up to 500kHz Signal Frequency
16bit NMC
90dB SNR
high common mode range of +/-7V
integrated arctan calculation
integrated digital sinc filter

Incremental encoder with sine/cosine outputs
Dual-channel low power data acquisition

Continuous time Delta Sigma modulators avoid the need for further external analog signal processing
The reliability and performance of the complete system is increased while minimizing complexity and production costs
Evaluation Board

Analog-digital converter for readout of encoders with SinCos outputs

Encoder systems are among the most common devices for controlling motors

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