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THS4532IPWR Datasheet(PDF) 36 Page - National Semiconductor (TI) |
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THS4532IPWR Datasheet(HTML) 36 Page - National Semiconductor (TI) |
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36 / 44 page  −150 −140 −130 −120 −110 −100 −90 −80 −70 −60 −50 −40 −30 −20 −10 0 20 100 1k 10k 24k Frequency (Hz) G076 −115 −113 −111 −109 −107 −105 −103 −101 −99 −97 −95 20 100 1k 10k 20k Frequency (Hz) G075 THS4532 SLOS829 – FEBRUARY 2013 www.ti.com An audio analyzer is used to provide an analog audio input to the EVM and the PCM formatted digital output is read by the digital input on the analyzer. Data was taken at fS = 96kHz, and audio output uses PCM format. Other data rates and formats are expected to show similar performance in line with that shown in the data sheet. Figure 91 shows the THD+N vs Frequency with no weighting and Figure 92 shows an FFT with 1kHz input tone. Input signal to the PCM4204 for these tests is -0.5dBFS. Table 4 summarizes results of testing using the THS4532 + PCM4204 versus typical Data Sheet performance, and show it make an excellent drive amplifier for this ADC. Figure 91. THS4532 + PCM4204 THD+N vs Frequency with No Weighting Figure 92. THS4532 + PCM4204 1kHz FFT Table 4. 1kHz AC Analysis: Test Circuit versus PCM4204 Data Sheet Typical Specifications (fS = 96kSPS) CONFIGURATION TONE THD + N THS4532 + PCM4204 1kHz -106 dB PCM4204 Data Sheet (typ) 1kHz -103 dB SAR ADC PERFORMANCE THS4532 and ADS8321 Combined Performance To show achievable performance with a high performance SAR ADC, the THS4532 is tested as the drive amplifier for the ADS8321. The ADS8321 is a 16-bit, SAR ADC that offers excellent AC and DC performance, with ultra-low power and small size. The circuit shown in Figure 93 is used to test the performance. Data was taken using the ADS8321 at 100kSPS with input frequency of 10 kHz and signal levels 0.5 dB below full scale. The FFT plot of the spectral performance is in Figure 94. A summary of the FFT analysis results are in Table 5 along with ADS8321 typical data sheet performance at fS = 100kSPS. Please refer to its data sheet for more information. 36 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links :THS4532 |
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