OPA1622 Datasheet, PDF (25/36 Pages) Texas Instruments – OPA1622 SoundPlus™ High-Fidelity, Bipolar-Input, Audio Operational Amplifier

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3
2.5
2
1.5
1
10
100
1k
Frequency (Hz)
10k
C001
Figure 54. Headphone Amplifier Transfer Function
0.01
-80
16- Load
600- Load
32- Load
0.001
-100
0.0001
-120
10
100
1k
10k
Frequency (Hz)
C003
90-kHz measurement bandwidth, 1-V_RMS output
Figure 56. THD+N vs Frequency for Headphone Loads
0
±20
±40
±60
±80
±100
±120
-133.6 dBc (Second Harmonic)
±140
±160
±180
0
5k
10k
15k
20k
Frequency (Hz)
C005
1 kHz, 32-Ω load, 50 mW
Figure 58. Output Spectrum
OPA1622
SBOS727A – NOVEMBER 2015 – REVISED NOVEMBER 2015
0.1
-60
0.01
-80
0.001
-100
0.0001
0.00001
0.01
16- Load
32- Load
600- Load
0.1
1
Output Voltage (V_RMS)
22.4-kHz measurement bandwidth
-120
-140
C002
Figure 55. THD+N vs Output Voltage for Headphone Loads
0
±20
±40
±60
±80
±100
±120
-134 dBc (Second Harmonic)
±140
±160
±180
0
5k
10k
15k
20k
Frequency (Hz)
C004
1 kHz, 32-Ω load, 10 mW
Figure 57. Output Spectrum
0
±20
±40
±60
±80
±100
-126 dBc (Third Harmonic)
±120
±140
±160
±180
0
5k
10k
15k
20k
Frequency (Hz)
C006
1 kHz, 32-Ω load, 150 mW
Figure 59. Output Spectrum
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