HA17741 Datasheet, PDF (7/18 Pages) Hitachi Semiconductor – General-Purpose Operational Amplifier (Frequency Compensated)

HA17741/PS
Vertical: 5 V/div
Horizontal: 0.5 ms/div
Test circuit condition
V_CC = 15 V, V_EE = −15 V
R₁ = 110 kΩ, R₂ = 11 kΩ
C₁ = 0.0015 µF, C₂ = 0.015 µF
Test results
f = 929.7 Hz, T.H.P = 0.06%
Figure 9 HA17741 Wien Bridge Sine Wave Oscillator Operating Waveform
Quadrature Oscillator
R_{T1 C1}
Sin out
C_T1
−
A1
+
R_T2
R₁
Cos out
V₄
C_T2
−
A2
+
D₁ ^R11
R₂₂
R₄₄
D₂
R₃₃
V₈
Figure 10 Quadrature Sine Wave Oscillator
Figure 10 shows the circuit diagram for a quadrature sine wave oscillator. This circuit consists of two
integrators and a limiter circuit, and provides not only a sine wave output, but also a cosine output, that is,
it also supplies the waveform delayed by 90°. The output amplitude is essentially determined by the limiter
circuit.
7