THS4521 datasheet(39/56 Pages) TI1

39 / 56 page

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THS4531

www.ti.com

SLOS358B – SEPTEMBER 2011 – REVISED MARCH 2012

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 87 shows the THD+N vs Frequency with no weighting and Figure 88 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

THS4531 + PCM4204 versus typical Data Sheet performance, and show it make an excellent drive amplifier for

this ADC.

Figure 87. THS4531 + PCM4204 THD+N vs Frequency with No Weighting

Figure 88. THS4531 + PCM4204 1kHz FFT

Table 4. 1kHz AC Analysis: Test Circuit versus PCM4204 Data Sheet Typical Specifications (fS = 96kSPS)

CONFIGURATION

TONE

THD + N

THS4531 + PCM4204

1kHz

-106 dB

PCM4204 Data Sheet (typ)

1kHz

-103 dB

SAR ADC PERFORMANCE

THS4531 and ADS8321 Combined Performance

To show achievable performance with a high performance SAR ADC, the THS4531 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 89 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 90. 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.

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