Frequency (Hz)

20

50

100

500

1000

5000

10000

20000

-130

-120

-110

-100

-90

-80

-70

-60

D106

Frequency (Hz)

20 30

50 70100

200300 500 1000 2000

5000 10000 20000

100000

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

20

Freq

ADC6

Channel-1

Channel-2

Channel-3

Channel-4

Frequency (Hz)

20

50

100

500

1000

5000

10000

20000

-130

-120

-110

-100

-90

-80

-70

-60

D103

Channel-1 : DRE enabled

Channel-2 : DRE enabled

Channel-3 : DRE enabled

Channel-4 : DRE enabled

Frequency (Hz)

20

50

100

500

1000

5000

10000

20000

-130

-120

-110

-100

-90

-80

-70

-60

D410

Channel-1

Channel-2

Channel-3

Channel-4

Input Amplitude (dB)

-130

-115

-100

-85

-70

-55

-40

-25

-10

0

-130

-120

-110

-100

-90

-80

-70

-60

THD+

D101

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+

D101

Channel-1 : DRE disabled

Channel-2 : DRE disabled

Channel-3 : DRE disabled

Channel-4 : DRE disabled

8

PCM1840

SBAS989 – APRIL 2019

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Product Folder Links: PCM1840

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Copyright © 2019, Texas Instruments Incorporated

6.8 Typical Characteristics

TDM slave mode, PLL on, DRE_LVL = –36 dB, channel gain = 0 dB, and linear phase decimation filter (unless otherwise

noted); all performance measurements are done with a 20-kHz, low-pass filter, and an A-weighted filter

Differential input

Figure 2. THD+N vs Input Amplitude With DRE Enabled

Differential input

Figure 3. THD+N vs Input Amplitude With DRE Disabled

Figure 4. THD+N vs Input Frequency With a –60-dBr Input

Figure 5. THD+N vs Input Frequency With a –1-dBr Input

Figure 6. Frequency Response With a –12-dBr Input

Figure 7. Power-Supply Rejection Ratio vs Ripple