OPA227 Datasheet, PDF (26/46 Pages) Burr-Brown (TI) – High Precision, Low Noise OPERATIONAL AMPLIFIERS

OPA227, OPA2227, OPA4227
OPA228, OPA2228, OPA4228
SBOS110B – MAY 1998 – REVISED JUNE 2015
Application Information (continued)
8.1.5 Three-Band Active Tone Control (Bass, Midrange, and Treble)
R₁
7.5kΩ
Bass Tone Control
R₂
50kΩ
3 ^CW 1
R₃
7.5kΩ
2
R₁₀
100kΩ
Midrange Tone Control
C₁
940pF
R₄
R₅
50kΩ
2.7kΩ
3 ^CW 1
V_IN
R₆
2.7kΩ
2
C₂
0.0047μF
R₇
7.5kΩ
Treble Tone Control
R₈
50kΩ
3 ^CW 1
2
R₉
7.5kΩ
C₃
680pF
R₁₁
100kΩ
2
6
OPA227
3
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V_OUT
Figure 49. Three-Band Active Tone Control (Bass, Midrange, and Treble)
8.2 Typical Application
CF
RIN
Input
RF
±
+
CLOAD
Output
RLOAD
Figure 50. Typical Application Schematic
8.2.1 Design Requirements
1. Operate OPAx228 gain is less than 5 V/V
2. Stable operation with capacitive load
26
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