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| OPA2604 Datasheet, PDF (16/26 Pages) Burr-Brown (TI) – Dual FET-Input, Low Distortion OPERATIONAL AMPLIFIER | |||
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OPA2604
SBOS006A â SEPTEMBER 2000 â REVISED DECEMBER 2015
Typical Applications (continued)
8.2.2.1 Design Requirements
The filter shown in Figure 26 is intended to meet the following design requirements:
⢠Third-order low pass filter response
⢠40-kHz cutoff frequency
⢠Linear phase
⢠Constant group delay
8.2.3 DAC I/V Amplifier and Low-Pass Filter
C1*
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I-Out DAC
COUT
R1
C2
2kΩ
2200pF
1
2
1
2
R2
R3
OPA2604
VO
OPA2604
2.94kΩ
21kΩ
* C1 =~
COUT
2p R1 fc
R1 = Feedback resistance = 2kΩ
fc = Crossover frequency = 8MHz
C3
470pF
Low-pass
2-pole Butterworth
fâ3dB = 20kHz
Figure 27. DAC I/V Amplifier and Low-Pass Filter
8.2.3.1 Design Requirements
The current to voltage converter shown in Figure 27 is intended to meet the following design requirements:
⢠Second-order low pass filter response
⢠8-MHz cutoff frequency
⢠Butterworth response
⢠2-kΩ transimpedance
16
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