THS4531A_16 Datasheet, PDF (36/59 Pages) Texas Instruments – Ultra Low-Power, Rail-to-Rail Output, Fully Differential Amplifier

THS4531A
SLOS823C – DECEMBER 2012 – REVISED JANUARY 2016
Typical Applications (continued)
9.2.1.3 Application Curve
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
−110
−120
−130
−140
0
V_S = 5 V
G = 1 V/V
R_F = 2 kΩ
V_OUT = −0.5 dBFS
10k
20k
30k
40k
50k
Frequency (Hz)
G078
Figure 86. THS4531A + ADS8321 1-kHz FFT
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CONFIGURATION
THS4531A + ADS8321
ADS8321 Data Sheet (typical)
Table 6. 10-kHz FFT Analysis Summary
TONE
10 kHz
10 kHz
SIGNAL
–0.5 dBFS
–0.5 dBFS
SNR
87 dBc
87 dBc
THD
–96 dBc
–86 dBc
SINAD
87 dBc
84 dBc
SFDR
100 dBc
86 dBc
9.2.2 Audio ADC Driver Performance: THS4531A and PCM4204 Combined Performance
To show achievable performance with a high performance audio ADC, the THS4531A is tested as the drive
amplifier for the PCM4204. The PCM4204 is a high-performance, four-channel analog-to-digital converter (ADC)
designed for professional and broadcast audio applications. The PCM4204 architecture uses a 1-bit delta-sigma
modulator per channel incorporating an advanced dither scheme for improved dynamic performance, and
supports PCM output data. The PCM4204 provides flexible serial port interface and many other advanced
features. Refer to the PCM4204 data sheet for more information. Figure 87 shows the circuit.
2k
2k
V_IN±
From Analyzer
V_IN+
0.22 F
2k
1 nF
40.2
5V
V_OUT±
+
V_OCM
±
THS4531A
V_OUT+
1 nF
40.2
2k
100 pF
2.7 nF
To Analyzer
PCM4204
100 pF
Figure 87. THS4531A and PCM4204 Test Circuit
36
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