THS4532 Datasheet, PDF (32/44 Pages) Texas Instruments – Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier

THS4532
SLOS829 – FEBRUARY 2013
200
100
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10
V_S = 2.7 V
G = 1 V/V
R_F = 2 kΩ
R_L = 2 kΩ
1
1
10
100
1k 2k
C_LOAD (pF)
G068
Figure 82. Recommended Series Output Resistor vs Capacitive Load for Flat Frequency Response
3
0
−3
−6
−9
−12
−15
−18
−21
100k
V_S = 2.7 V
G = 1 V/V
R_F = 2 kΩ
R_L = 2 kΩ
V_OUT = 100 mV_pp
C_L = 0 pF, R_O = 0 Ω
C_L = 15 pF, R_O = 200 Ω
C_L = 39 pF, R_O = 100 Ω
C_L = 120 pF, R_O = 50 Ω
C_L = 470 pF, R_O = 20 Ω
C_L = 1200 pF, R_O = 12 Ω
1M
10M
Frequency (Hz)
100M
G069
Figure 83. Frequency Response for Various R_O and C_L Values
Audio Performance
The THS4532 provides excellent audio performance with very low quiescent power. To show performance in the
audio band, the device was tested with an audio analyzer. THD+N and FFT tests were run at 1Vrms output
voltage. Performance is the same on both 2.7V and 5V supply. Figure 84 is the test circuit used, and Figure 85
and Figure 86 show performance of the analyzer. In the FFT plot the harmonic spurs are at the testing limit of the
analyzer, which means the THS4532 is actually much better than can be directly measured. Because the
THS4532 distortion performance cannot be directly measured in the audio band it is estimated from
measurement in high noise gain configuration correlated with simulation.
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