TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, RL = 2kΩ, unless otherwise noted.
HEADROOM – TOTAL HARMONIC DISTORTION
+ NOISE vs OUTPUT AMPLITUDE
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
0.01
0.001
1
0.1
VS = ±18V
RL = 2kΩ
f = 1kHz
THD < 0.01%
OPA134 – 11.7Vrms
OP176 – 11.1Vrms
VO = 10Vrms
RL = 2kΩ
VS = ±16
0.010
OPA134
Baseline
0.0001
0.00001
OPA134
OP176
0.001
VS = ±17
100
VS = ±18
0.0005
20
1k
Frequency (Hz)
10k 20k
0.1
10
20
1
Output Amplitude (Vrms)
HARMONIC DISTORTION + NOISE vs FREQUENCY
VOLTAGE NOISE vs SOURCE RESISTANCE
0.01
1k
100
10
2nd Harmonic
3rd Harmonic
OP176+
Resistor
0.001
0.0001
Ω
L = 600
R
OPA134+
Resistor
Ω
L = 2k
R
0.00001
0.000001
1
Resistor Noise
VO = 1Vrms
Vn (total) = √(inRS)2 + en2 + 4kTRS
Only
0.1
20
100
1k
10k 20k
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Source Resistance (Ω)
INPUT-REFERRED NOISE VOLTAGE
vs NOISE BANDWIDTH
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
100
10
1
1k
RS = 20Ω
100
Peak-to-Peak
RMS
Voltage Noise
10
1
Current Noise
0.1
1
10
100
1k
10k
100k
1
10
100
1k
10k
100k
1M
Noise Bandwidth (Hz)
Frequency (Hz)
®
4
OPA134/2134/4134
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