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SM6661A Arkusz danych(PDF) 7 Page - Nippon Precision Circuits Inc |
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SM6661A Arkusz danych(HTML) 7 Page - Nippon Precision Circuits Inc |
7 / 14 page SM6661A SEIKO NPC CORPORATION —7 FUNCTIONAL DESCRIPTION Sensor Signal Input and Output The signal output of gyroscope IC is connected to VSIG_IN1 pin. The first stage amplifier of SM6661A is dif- ferential input, so that VREF_IN1 pin is input zero-rate voltage of gyroscope IC. (Normally, the reference voltage output pin of gyroscope IC should be connected to VREF_IN1 pin.) The amplified signal is output from VSIG_OUT1 pin. Note that the output signal is reverse phase of input sig- nal from VSIG_IN1 pin. The zero-rate voltage of output signal is VCC/2V. The description of VSIG_IN2, VREF_IN2 and VSIG_OUT2 pins are the same as above VSIG_IN1, VREF_IN1 and VSIG_OUT1 pins. VCC/2 Pin The VCC/2 pin is a reference voltage pin. Smoothing capacitors should be connected between VCC/2 pin and GND. The recommended values of smoothing capacitors are parallel-connected 10 µF electrolytic capacitor and 0.1 µF ceramic capacitor. Output Gain and Frequency Characteristics Setting The output gain and frequency characteristics of SM6661A are adjustable with connecting external resistors and capacitors as shown below. Output gain setting The output gain of SM6661A is adjustable by changing the value of external resistors R1 and R2. The SM6661A has a built-in 30dB amplifier, so that the output gain “Gain2” is determined by the formula below; VSIG_OUT1 VSIG_OUT2 GAIN1 GAIN2 HPF1 HPF2 R1 C1 R2 C2 AMP 30dB AMP 0 to 20dB + − + − Gain2 = 20 × log ( ) + 30 [dB] R2 R1 |
Podobny numer części - SM6661A |
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Podobny opis - SM6661A |
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