THS4521 datasheet(38/54 Pages) TI1

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50m

100m

150m

200m

0.5

1.5

2.5

Time (s)

Power Down

VOUT +

VOUT −

VS = 5 V

G = 2 V/V

RF = 2 kΩ

RL = 200 Ω

G074

2 kΩ

0.22 μF

THS4531

VOUT+

40.2 Ω

VOUT–

40.2 Ω

From Analyzer

VIN+

VIN–

–

VOCM

100 pF

2 kΩ

1 nF

100 pF

2.7 nF

2 kΩ

To Analyzer

PCM4204

THS4531

SLOS358B – SEPTEMBER 2011 – REVISED MARCH 2012

www.ti.com

Figure 85. PD Enable Pop Performance

AUDIO ADC DRIVER PERFORMANCE: THS4531 AND PCM4204 COMBINED PERFORMANCE

To show achievable performance with a high performance audio ADC, the THS4531 is tested as the drive

amplifier for the PCM4204. The PCM4204 is a high-performance, four-channel analog-to-digital (A/D) converter

designed for professional and broadcast audio applications. The PCM4204 architecture utilizes 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. Please refer to its data sheet for more information.

The PCM4204 EVM is used to test the audio performance of the THS4531 as a drive amplifier. The standard

PCM4204 EVM is provided with 4x OPA1632 fully differential amplifiers, which use the same pin out as the

THS4531. For testing, one of these amplifiers is replaced with a THS4531 device in same package (MSOP), gain

changed to 1V/V, and power supply changed to single supply +5V. Figure 86 shows the circuit. With single

supply +5V supply the output common-mode of the THS4531 defaults to +2.5V as required at the input of the

PCM4204. So the resistor connecting the VOCM input of the THS4531 to the input common-mode drive from the

PCM4204 is optional and no performance change was noted with it connected or removed. The EVM power

connections were modified by connecting positive supply inputs, +15V, +5VA and +5VD, to a +5V external power

supply (EXT +3.3 was not used) and connecting -15V and all ground inputs to ground on the external power

supply so only one external +5V supply was needed to power all devices on the EVM.

Figure 86. THS4531 and PCM4204 Test Circuit

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THS4521 Datasheet(PDF) 38 Page - Texas Instruments

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