80

70

60

50

40

30

20

10

0

30

35

40

45

50

Sampling Frequency (kHz)

G018

ADC and DAC

3

3.1

3.2

3.3

3.4

3.5

3.6

Supply Voltage (V)

80

70

60

50

40

30

20

10

0

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

G017

Operational

Suspend

0.008

0.007

0.006

0.005

0.004

0.003

3

3.6

Supply Voltage (V)

G009

3.1

3.2

3.3

3.4

3.5

98

97

96

95

94

93

92

91

90

3

3.6

Supply Voltage (V)

G010

3.1

3.2

3.3

3.4

3.5

SNR

Dynamic Range

0.01

0.009

0.008

0.007

0.006

0.005

0.004

0.003

2.8

3

3.2

3.4

3.6

3.8

Supply Voltage (V)

G003

95

93

91

89

87

85

2.8

3

3.2

3.4

3.6

3.8

Supply Voltage (V)

G004

SNR

Dynamic Range

PCM2903C

www.ti.com

SBFS038A – JUNE 2012 – REVISED SEPTEMBER 2015

10.2.2 Detailed Design Procedure

The PCM2903C is a simple design device since it is capable to connect directly to a USB port. Only two external

ICs are needed, a 3.3-V regulator and an AND Gate. The switches connected to the HID ports must be normally

open. Other than this, it only needs decoupling capacitors on the voltage source pins.

10.2.3 Application Curves

Figure 42. ADC Total Harmonic Distortion + Noise at –1 dB

Figure 43. ADC Dynamic Range and SNR vs Supply

vs Supply Voltage

Voltage

Figure 44. DAC Total Harmonic Distortion + Noise at 0 dB

Figure 45. DAC Dynamic Range and SNR vs Supply

vs Supply Voltage

Voltage

Figure 46. Operational and Suspend Supply Current vs

Figure 47. Operational Supply Current vs Sampling

Supply Voltage

Frequency

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