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SM6661A Arkusz danych(PDF) 7 Page - Nippon Precision Circuits Inc

Numer części SM6661A
Szczegółowy opis  Post-amplifier for Gyroscope
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Producent  NPC [Nippon Precision Circuits Inc]
Strona internetowa  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM6661A Arkusz danych(HTML) 7 Page - Nippon Precision Circuits Inc

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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


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