MCP3561 datasheet(21/108 Pages) MICROCHIP

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DS20006181C-page 21

MCP3561/2/4

TABLE 2-1:

NOISE RMS LEVEL VS. GAIN VS. OSR (AVDD =DVDD =VREF = 3.3V, TA =+25°C)

TOTAL

OSR

RMS (Peak-to-Peak) Noise (µV)

GAIN =0.33

GAIN=1

GAIN= 2

GAIN = 4

GAIN= 8

GAIN= 16

365.02 (2932.55)

120.80 (981.90)

60.79 (489.77)

30.70 (243.71)

15.69 (125.98)

8.23 (65.94)

68.06 (566.05)

23.56 (189.40)

12.54 (101.97)

7.06 (55.09)

4.25 (34.15)

2.77 (22.05)

128

35.21 (313.00)

12.68 (108.08)

7.03 (57.36)

4.19 (33.51)

2.68 (21.43)

1.83 (14.47)

256

24.83 (212.31)

8.94 (73.35)

4.94 (40.62)

2.94 (23.38)

1.88 (15.17)

1.29 (10.11)

512

17.99 (150.04)

6.43 (52.02)

3.53 (28.51)

2.09 (17.02)

1.34 (10.58)

0.92 (7.32)

1024

15.12 (123.74)

5.40 (43.95)

2.97 (23.54)

1.75 (14.05)

1.12 (8.82)

0.77 (6.20)

2048

11.47 (91.51)

4.08 (32.01)

2.26 (18.04)

1.34 (10.69)

0.86 (6.79)

0.59 (4.57)

4096

8.32 (64.97)

2.98 (23.59)

1.66 (13.10)

0.98 (7.85)

0.63 (4.97)

0.43 (3.45)

8192

5.88 (44.39)

2.11 (15.61)

1.18 (8.99)

0.70 (5.39)

0.45 (3.37)

0.31 (2.30)

16384

4.16 (30.56)

1.50 (10.80)

0.84 (6.12)

0.50 (3.65)

0.32 (2.28)

0.22 (1.60)

20480

3.71 (26.82)

1.34 (9.65)

0.75 (5.29)

0.44 (3.27)

0.28 (2.06)

0.19 (1.41)

24576

3.40 (24.24)

1.23 (8.88)

0.69 (4.88)

0.41 (2.94)

0.26 (1.92)

0.18 (1.29)

40960

2.70 (18.79)

0.98 (6.53)

0.55 (3.83)

0.32 (2.22)

0.20 (1.41)

0.14 (0.96)

49152

2.52 (17.44)

0.90 (6.08)

0.50 (3.47)

0.30 (2.07)

0.19 (1.25)

0.13 (0.87)

81920

2.05 (13.19)

0.74 (4.64)

0.40 (2.56)

0.24 (1.52)

0.15 (0.96)

0.10 (0.63)

98304

1.94 (12.20)

0.68 (4.37)

0.38 (2.39)

0.22 (1.37)

0.14 (0.89)

0.09 (0.59)

TABLE 2-2:

EFFECTIVE RESOLUTION VS. GAIN VS. OSR (AVDD =DVDD =VREF =3.3V,

TA =+25°C)

TOTAL

OSR

Effective Resolution RMS (Peak-to-Peak) (bits)

GAIN = 0.33

GAIN = 1

GAIN = 2

GAIN = 4

GAIN = 8

GAIN = 16

15.7 (12.7)

15.6 (12.6)

18.2 (15.1)

18.1 (15.1)

18.0 (15.0)

17.8 (14.9)

17.6 (14.6)

17.2 (14.2)

128

19.1 (16.0)

19.0 (15.9)

18.8 (15.8)

18.6 (15.6)

18.2 (15.2)

17.8 (14.8)

256

19.6 (16.5)

19.5 (16.5)

19.4 (16.3)

19.1 (16.1)

18.7 (15.7)

18.3 (15.3)

512

20.1 (17.0)

20.0 (17.0)

19.8 (16.8)

19.6 (16.6)

19.2 (16.3)

18.8 (15.8)

1024

20.3 (17.3)

20.2 (17.2)

20.1 (17.1)

19.8 (16.8)

19.5 (16.5)

19.0 (16.0)

2048

20.7 (17.7)

20.6 (17.7)

20.5 (17.5)

20.2 (17.2)

19.9 (16.9)

19.4 (16.5)

4096

21.2 (18.2)

21.1 (18.1)

20.9 (17.9)

20.7 (17.7)

20.3 (17.3)

19.9 (16.9)

8192

21.7 (18.8)

21.6 (18.7)

21.4 (18.5)

21.2 (18.2)

20.8 (17.9)

20.4 (17.5)

16384

22.2 (19.3)

22.1 (19.2)

21.9 (19.0)

21.6 (18.8)

21.3 (18.5)

20.9 (18.0)

20480

22.4 (19.5)

22.2 (19.4)

22.1 (19.2)

21.8 (18.9)

21.5 (18.6)

21.0 (18.2)

24576

22.5 (19.7)

22.4 (19.5)

22.2 (19.4)

21.9 (19.1)

21.6 (18.7)

21.1 (18.3)

40960

22.8 (20.0)

22.7 (20.0)

22.5 (19.7)

22.3 (19.5)

21.9 (19.2)

21.5 (18.7)

49152

22.9 (20.1)

22.8 (20.1)

22.7 (19.9)

22.4 (19.6)

22.1 (19.3)

21.6 (18.9)

81920

23.2 (20.5)

23.1 (20.4)

23.0 (20.3)

22.7 (20.1)

22.4 (19.7)

22.0 (19.3)

98304

23.3 (20.6)

23.2 (20.5)

23.1 (20.4)

22.8 (20.2)

22.5 (19.8)

22.1 (19.4)

Note:

To calculate noise RMS level and Effective Resolution (Bits) for a given gain and data rate, refer to the OSR

setting and associated data rate relationship shown in Table 5-6.

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