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OP176GS Datenblatt(PDF) 8 Page - Analog Devices

Teilenummer OP176GS
Bauteilbeschribung  Bipolar/JFET, Audio Operational Amplifier
PDF  21 Pages
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OP176GS Datenblatt(HTML) 8 Page - Analog Devices

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OP176
REV. 0
–8–
APPLICATIONS
Short Circuit Protection
The OP176 has been designed with output short circuit
protection. The typical output drive current is
±50 mA. This
high output current and wide output swing combine to yield an
excellent audio amplifier, even when driving large signals, at low
power and in a small package.
Total Harmonic Distortion
Total Harmonic Distortion + Noise (THD + N) of the OP176
is well below 0.001% with any load down to 600
Ω. However,
this is dependent upon the peak output swing. In Figure 23 it is
seen that the THD + Noise with 3 V rms output is below
0.001%. In the following Figure 24, THD + Noise is below
0.001% for the 10 k
Ω and 2 kΩ loads but increases to above
0.01% for the 600
Ω load condition. This is a result of the
output swing capability of the OP176. Notice the results in
Figure 25, showing THD vs. V
IN (V rms).
FIGURE 23. THD + Noise vs. Frequency
0.1
0.010
0.001
0.0001
20
100
1k
10k
20k
±V
S = ±18V
VO = 10Vrms
Ω600Ω
2k
Ω
10k
Ω
Figure 24. THD + Noise vs. R
LOAD
Figure 25. THD + Noise vs. Output Amplitude (V rms)
The output of the OP176 is designed to maintain low harmonic
distortion while driving 600
Ω loads. However, driving 600 Ω
loads with very high output swings results in higher distortion if
clipping occurs.
To attain low harmonic distortion with large output swings,
supply voltages may be increased. Figure 26 shows the perfor-
mance of the OP176 driving 600
Ω loads with supply voltages
varying from
±18 volts to ±20 volts. Notice that with ±18 volt
supplies the distortion is fairly high, while with
±20 volt supplies
it is a very low 0.0007%.
0.1
0.010
0.001
0.0001
20
100
1k
10k
20k
ΩR
L = 600Ω
VO = ±18V
VO = ±20V
VO = ±19V
VO = ±22V
Figure 26. THD + Noise vs. Supply Voltage
±V
S = ±15V
VO = 3Vrms
0.1
0.010
0.001
.0001
20
100
1k
10k
20k
Ω600Ω
0.1
0.010
0.001
.0001
20
100
1k
10k
20k
±V
S = ±18V
ΩR
L = 600Ω
Ω10Vrms
Ω5Vrms
Ω3Vrms
Ω1Vrms



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