AMC131M03 datasheet(13/90 Pages) TI

13 / 90 page

7 Parameter Measurement Information

7.1 Noise Measurements

Adjust the data rate and gain to optimize the AMC131M03-Q1 noise performance. When averaging is increased

by reducing the data rate, noise drops correspondingly. Table 7-1 summarizes the AMC131M03-Q1 noise

performance using the 1.2-V internal reference and a 3.3-V power supply at the DVDD pin. Data are

representative of typical noise performance at TA = 25°C when fCLKIN = 8.192 MHz. The clock divider is

configured to the default setting (that is, the CLK_SEL[2:0] bits in the CLOCK register are set to 000b), thus

the modulator clock frequency (fMOD) is equal to fCLKIN / 2. The data shown are typical input-referred noise

results with the analog inputs shorted together and taking an average of multiple readings across all channels.

A minimum 1 second of consecutive readings are used to calculate the RMS noise for each reading. Table 7-2

lists the dynamic range and effective resolution calculated from the noise data. Equation 1 calculates dynamic

range. Equation 2 calculates effective resolution. In each case, VREF corresponds to the internal 1.2-V reference.

In global-chop mode, noise improves by a factor of √2.

Noise performance scales with the OSR and gain settings, but is independent from the configured power mode.

Thus, the device exhibits the same noise performance in different power modes when selecting the same OSR

and gain settings. However, the data rate at the OSR settings scales based on the applied clock frequency for

the different power modes.

REF

RMS

Dynamic Range = 20 log

2 Gain V

(1)

REF

RMS

2 V

Effective Resolution = log

Gain V

(2)

Table 7-1. Noise (µVRMS) at TA = 25°C, Channel 0

OSR

DATA RATE (kSPS),

fCLKIN = 8.192 MHz

GAIN

128

16384

0.25

8.39

2.84

2.32

1.71

1.18

0.96

1.07

0.95

8192

0.5

11.16

5.15

3.06

2.11

1.75

1.31

1.42

1.29

4096

14.77

6.58

4.09

2.99

2.46

1.88

1.80

1.88

2048

15.94

7.62

5.20

3.59

2.96

2.26

2.37

2.27

1024

17.57

8.93

6.48

4.58

3.61

2.76

2.94

2.88

512

22.01

11.98

8.77

6.55

5.18

4.03

3.94

3.92

256

28.78

15.81

11.88

8.85

7.33

5.64

5.71

5.76

128

41.61

22.71

17.54

12.47

10.20

8.07

8.04

8.13

90.98

48.02

30.44

20.06

15.00

11.32

11.40

10.06

Table 7-2. Dynamic Range (Effective Resolution) at TA = 25°C, Channel 0

OSR

DATA RATE (kSPS),

fCLKIN = 8.192 MHz

GAIN

128

16384

0.25

100 (18.1)

103 (18.7)

99 (18.0)

96 (17.4)

93 (17.0)

89 (16.2)

82 (15.1)

77 (14.3)

8192

0.5

98 (17.7)

98 (17.8)

97 (17.6)

94 (17.1)

90 (16.4)

86 (15.8)

79 (14.7)

74 (13.8)

4096

95 (17.3)

96 (17.5)

94 (17.2)

91 (16.6)

87 (15.9)

83 (15.3)

77 (14.3)

71 (13.3)

2048

95 (17.2)

95 (17.3)

92 (16.8)

89 (16.4)

85 (15.6)

81 (15.0)

75 (13.9)

69 (13.0)

1024

94 (17.1)

94 (17.0)

90 (16.5)

87 (16.0)

83 (15.3)

80 (14.7)

73 (13.6)

67 (12.7)

512

92 (16.7)

91 (16.6)

88 (16.1)

84 (15.5)

80 (14.8)

76 (14.2)

71 (13.2)

65 (12.2)

256

89 (16.3)

89 (16.2)

85 (15.6)

82 (15.0)

77 (14.3)

73 (13.7)

67 (12.7)

61 (11.7)

128

86 (15.8)

85 (15.7)

82 (15.1)

79 (14.6)

74 (13.8)

70 (13.2)

64 (12.2)

58 (11.2)

79 (14.7)

79 (14.6)

77 (14.3)

74 (13.9)

71 (13.3)

67 (12.7)

61 (11.7)

56 (10.9)

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AMC131M03-Q1

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