AMC131M01DFMR datasheet(15/81 Pages) TI

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7 Parameter Measurement Information

7.1 Noise Measurements

Adjust the data rate and gain to optimize the AMC131M01 noise performance. When averaging is increased by

reducing the data rate, noise drops correspondingly. Table 7-1 summarizes the AMC131M01 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[1:0] bits in the CLOCK register are set to 00b), 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. 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 Table 7-3 lists the 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

OSR

DATA RATE (kSPS),

fCLKIN = 8.192 MHz

GAIN

128

16384

0.25

3.92

2.15

1.69

0.97

0.84

0.47

0.57

0.51

8192

0.5

4.55

3.16

2.91

2.23

1.67

1.55

1.07

0.92

4096

6.35

3.85

3.17

2.43

1.76

1.56

1.53

1.67

2048

7.55

4.92

3.92

2.94

2.46

1.68

1.56

1.85

1024

8.43

6.06

5.04

4.03

3.39

1.75

2.03

2.86

512

12.26

9.21

7.60

6.34

5.15

4.22

4.63

4.36

256

17.45

11.88

10.51

8.39

7.10

6.35

5.58

4.75

128

26.24

17.20

14.68

10.44

7.75

7.72

8.35

7.87

77.32

42.11

28.44

16.83

10.89

9.94

9.06

8.99

Table 7-2. Dynamic Range (dB) at TA = 25°C

OSR

DATA RATE (kSPS),

fCLKIN = 8.192 MHz

GAIN

128

16384

0.25

107

106

102

101

8192

0.5

105

103

4096

103

101

2048

101

1024

100

512

256

128

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AMC131M01

SBASA57 – SEPTEMBER 2023

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