Hello!
We have some ADXRS642 gyroscopes. Output signal (RATEOUT) have additional squarewave about 0.5 - 1.5 Volts (without external capacitor between RATEOUT and SUMJ, Fig. 1, Fig. 2) and about 10 mV (with external capacitor 100nF between RATEOUT and SUMJ, Fig. 3). Frequency of this squarewave equally of Cp1 and Cp2 signals frequency. This problem stay if we connect Cp5 to 18 - 20 Volts (with and without capacitors between Cp1-Cp2 and Cp3-Cp4).
Fig. 1. Yellow - RATEOUT signal (without capacitor beetwen RATEOUT and SUMJ), blue - SUMJ signal.
Fig. 2. Yellow - RATEOUT signal (without capacitor beetwen RATEOUT and SUMJ), blue - Cp1 signal.
Fig. 3. Yellow - RATEOUT signal (with capacitor 100nF beetwen RATEOUT and SUMJ), blue - Cp1 signal.
Fig. 4. PCB TOP
Fig. 5. PCB BOTTOM
Please, explaine this problem.
Сообщение отредактировано: Alexander Ladonkin