HA17741 Datasheet, PDF (8/18 Pages) Hitachi Semiconductor – General-Purpose Operational Amplifier (Frequency Compensated)

HA17741/PS
30
C_T1 = 102 pF
C_T2 = 99 pF
10
C₁ = 106 pF
3
1.0
0.3
0.1
V_CC = −V_EE = 15 V
R_T1 = 150 kΩ, R_T2 = 150 kΩ
R₁ = 151.2 kΩ
R₁₁ = 15 kΩ, R₂₂ = 10 kΩ
R₃₃ = 15 kΩ, R₄₄ = 10 kΩ
C_T1, C_T2, C₁ → 1,000 pF
Use a Mylar capacitor.
With V_OP-P = 21 V_P-P and
R₂₂ = R₄₄ = 10 kΩ
the frequency of the sine
wave will be under 10 kHz.
Sin out
Cos out
0.03
0.01
100 p
1,000 p
0.01 µ
0.1 µ
C_T1, C_T2, C₁ (F)
Figure 11 HA17741 Quadrature Sine Wave Oscillator
f−C_T1, C_T2, C₁ Characteristics
← Sin out
0
← Cos out
Vertical: 5 V/div
Horizontal: 0.2 ms/div
Circuit constants
C_T1 = 1000 pF (990), C_T2 = 1000 pF (990)
R_T1 = 150 kΩ, R_T2 = 150 kΩ
C₁ = 1000 pF (990), R₁ = 160 kΩ
R₁₁ = 15 kΩ, R₂₂ = 10 kΩ
R₃₃ = 16 V, R₄₄ = 10 kΩ
V_CC = 15 V, V_EE = −15 V
Figure 12 Sine and Cosine Output Waveforms
Triangular Wave Generator
Integrator
D₁ R₃
D₂ R₄
C
−
A1
+
Vout1
Vout2
Hysteresis comparator
R₁
R₂
V_A
+
A2
−
R₁/R₂
Figure 13 Triangular Wave Generator Operating Circuit
8