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OPA2836 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
OPA2836 Very-Low-Power, Rail-to-Rail Out, Negative Rail In, Voltage-Feedback Operational Amplifiers TI
Texas Instruments TI
OPA2836 Datasheet PDF : 59 Pages
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www.ti.com
9.2.1.3 Application Curves
OPA836, OPA2836
SLOS712I – JANUARY 2011 – REVISED OCTOBER 2016
Figure 75 shows the THD+N performance with 100-kΩ and 300-Ω loads, and with A-weighting and with no
weighting. Both loads show similar performance. With no weighting, the THD+N performance is dominated by the
noise for both loads. A-weighting provides filtering that improves the noise, revealing the increased distortion with
RL = 300 Ω.
Figure 76 and Figure 77 show the FFT output with a 1-kHz tone and 100-kΩ and 300-Ω loads. To show relative
performance of the device versus the test set, one channel has the OPA836 device in-line between the generator
output and the analyzer. The other channel is in “Gen Mon” loopback mode, which internally connects the signal
generator to the analyzer input. With 100-kΩ load, Figure 76, the curves are indistinguishable from each other
except for noise, which means the OPA836 device cannot be directly measured. With 300-Ω load, as shown in
Figure 77, the main difference between the curves is that the OPA836 device shows slightly higher even-order
harmonics, but the performance of the test set masks the odd-order harmonics.
-90
-95
-100
-105
-110
-115
No weighting
RL = 300 W,
RL = 100 kW
A-weighting
RL = 300 W,
RL = 100 kW
VS = 5 V,
VOUT = 1 VRMS,
G = 1,
RF = 0 W,
BW = 80 kHz
-120
10
100
1k
10k
f - Frequency - Hz
100k
Figure 75. OPA836 1 VRMS 20-Hz to 80-kHz THD+N
0
-10
VS = 5 V,
-20
VOUT = 1 VRMS,
G = 1,
-30
RF = 0 W
-40
-50
-60
-70
-80
-90
-100
-110
Gen Mon - 100k
-120
-130
RL = 100k
-140
0
2k 4k 6k 8k 10k 12k 14 16k 18k 20k
f - Frequency - Hz
Figure 76. OPA836 and AP Gen Mon 10-kHz FFT Plot; VOUT
= 1 VRMS, RL = 100 kΩ
0
-10
VS = 5 V,
VOUT = 1 VRMS,
-20
G = 1,
-30
RF = 0 W
-40
-50
-60
-70
-80
-90
-100
Gen Mon - 300
-110
-120
RL = 300
-130
-140
0
2k 4k 6k 8k 10k 12k 14 16k 18k 20k
f - Frequency - Hz
Figure 77. OPA836 and AP Gen Mon 10-kHz FFT Plot;
VOUT = 1 VRMS, RL = 300 Ω
Copyright © 2011–2016, Texas Instruments Incorporated
Product Folder Links: OPA836 OPA2836
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