Frequency (Hz)

20

50

100

500

1000

5000

10000

20000

-200

-180

-160

-140

-120

-100

-80

-60

-40

-20

0

D212

Channel-1 : DRE disabled

Channel-2 : DRE disabled

Channel-3 : DRE disabled

Channel-4 : DRE disabled

Input Amplitude (dB)

-130

-115

-100

-85

-70

-55

-40

-25

-10

0

-130

-120

-110

-100

-90

-80

-70

-60

THD+

D202

Channel-1 : DRE disabled

Channel-2 : DRE disabled

Channel-3 : DRE disabled

Channel-4 : DRE disabled

Frequency (Hz)

20

50

100

500

1000

5000

10000

20000

-200

-180

-160

-140

-120

-100

-80

-60

-40

-20

0

D212

Channel-1 : DRE enabled

Channel-2 : DRE enabled

Channel-3 : DRE enabled

Channel-4 : DRE enabled

Input Amplitude (dB)

-130

-115

-100

-85

-70

-55

-40

-25

-10

0

-130

-120

-110

-100

-90

-80

-70

-60

THD+

D202

Channel-1 : DRE enabled

Channel-2 : DRE enabled

Channel-3 : DRE enabled

Channel-4 : DRE enabled

29

PCM1840

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SBAS989 – APRIL 2019

Product Folder Links: PCM1840

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Copyright © 2019, Texas Instruments Incorporated

8.2.3 Application Curves

Measurements are done on the EVM by feeding the device analog input signal using audio precision and with a

3.3-V AVDD supply.

Figure 49. FFT With a –60-dBr Input With DRE Enabled

Figure 50. THD+N vs Input Amplitude With DRE Enabled

Figure 51. FFT With a –60-dBr Input With DRE Disabled

Figure 52. THD+N vs Input Amplitude With DRE Disabled