OPA365-Q1_16 Datasheet, PDF (18/22 Pages) Texas Instruments – Single-Supply Operational Amplifiers

OPA365-Q1, OPA2365-Q1
SBOS512D – MARCH 2010 – REVISED DECEMBER 2015
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Typical Application (continued)
9.2.1.1 Design Requirements
Use the following design parameters for this application:
• Supply voltage: 2.2 V to 5 V
• Input signal: 0 V to 4.5 V
• Input signal frequency: 0 MHz to 1 MHz
9.2.1.2 Detailed Design Procedure
The circuit in Figure 30 detects the peak of an input signal and generates a DC output equal to the peak level
VOUT = VINpeak. The capacitor C1 is charged through the SD1 diode and limiting resistor R1. The only
discharging path for C1 is the OPA2365-Q1 very high input impedance. This allows the peak detection of low
frequency and low-duty cycle signal.
9.2.1.3 Application Curves
Figure 31. Supply Voltage 2.2 V, Peak Signal 1 V
Figure 32. Supply Voltage 5 V Peak Signal 4.5 V
9.2.2 Bandpass Filter 1.5 kHz to 160 kHz and 40-db Flat Gain
V+ = 5 V
100 K
100 K
GND
+
OPA365
_
V– = GND
V_OUT
C₁ = 0.22 µ
V_IN
R₁ = 470 W
C₂ = IopF
R₂ = 51 K
Figure 33. Bandpass Filter 1.5 kHz to 160 kHz and 40-db Flat Gain Schematic
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