Datasheet

OPA227, 2227, 4227
OPA228, 2228, 4228
17
SBOS110A
www.ti.com
FIGURE 17. Headphone Amplifier.
FIGURE 18. Three-Band ActiveTone Control (bass, midrange and treble).
200Ω
200Ω
1kΩ
1kΩ
1/2
OPA2227
1/2
OPA2227
–15V
0.1µF
0.1µF
+15V
Audio
In
This application uses two op amps
in parallel for higher output current drive.
To
Headphone
R
5
50kΩ
R
4
2.7kΩ
V
IN
V
OUT
R
6
2.7kΩ
C
1
940pF
C
2
0.0047µF
C
3
680pF
CW
CW
R
2
50kΩ
R
1
7.5kΩ
R
3
7.5kΩ
R
10
100kΩ
R
8
50kΩ
R
7
7.5kΩ
R
9
7.5kΩ
R
11
100kΩ
CW
Bass Tone Control
Midrange Tone Control
Treble Tone Control
13
6
2
3
2
13
2
13
2
OPA227