Rainbow-electronics MAX1401 Manual de usuario descargar pdf (Pagina 27)

MAX1401

+3V, 18-Bit, Low-Power, Multichannel,

Oversampling (Sigma-Delta) ADC

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Table 16b. Noise vs. Gain and Output Data Rate—Buffered Mode, V

REF

= 1.25V,

CLKIN

= 2.4576MHz

1482 163264128

GAIN (V/V)

EFFECTIVE RESOLUTION (BITS)

1482 16 32 64 128 256

256

GAIN (V/V)

EFFECTIVE RESOLUTION (BITS)

CLK = 1

FS1: FS0 = 0 or 1

FS1: FS0 = 2

FS1: FS0 = 3

CLK = 1

FS1: FS0 = 0 or 1

FS1: FS0 = 2

FS1: FS0 = 3

a) BUFF = 0

b) BUFF = 1

Figure 7. Effective Resolution vs. Gain and Notch Frequency

-3dB

FREQ.

(Hz)

50 13.1 5.72 3.21

OUTPUT

DATA

RATE

(sps)

2.10 1.41 1.42 1.44 1.38

TYPICAL OUTPUT NOISE (µV

RMS

)

FOR VARIOUS PROGRAMMABLE GAINS

1.34

BIT

STATUS

FS1:FS0 = 0

60 15.7 6.29 3.57 2.30 1.55 1.61 1.56 1.49 1.56 FS1:FS0 = 1

300 78.6 80.6 39.8 19.3 10.2 6.14 4.25 3.03 3.52 FS1:FS0 = 2

600

157.2 436 225 116 57.1 28.8 15.0 8.70

5.99 FS1:FS0 = 3

MF1:MF0 = 1

100

26.2 5.82 3.35 2.08 1.43 1.37 1.36 1.35 1.31 FS1:FS0 = 0

MF1:MF0 = 3

400

104.8 5.60 3.10 1.85 1.32 1.24 1.25 1.19

1.21 FS1:FS0 = 0

480 125.7 6.18 3.47 2.02 1.38 1.37 1.29 1.33 1.33 FS1:FS0 = 1

2400 628.8 76.3 39.3 20.8 9.83 5.92 3.92 3.92 3.07 FS1:FS0 = 2

120 31.4 6.01 3.65 2.27 1.51 1.51 1.50 1.50 1.47 FS1:FS0 = 1

600 157.2 77.7 40.1 20.2 10.6 5.93 4.19 3.54 3.23 FS1:FS0 = 2

1200 314.4 434 222 111 57.0 28.3 14.8 8.37

5.81 FS1:FS0 = 3

MF1:MF0 = 2

200

52.4 5.82 3.07 1.87 1.26 1.20 1.18 1.15

1.17 FS1:FS0 = 0

240 62.9 6.17 3.54 2.09 1.45 1.30 1.27 1.31 1.29 FS1:FS0 = 1

1200 314.4 79.0 41.1 19.8 10.5 5.68 3.68 3.14 2.99 FS1:FS0 = 2

2400

628.8 439 226 111 57.9 28.7 15.4 8.26

5.32 FS1:FS0 = 3

4800 1258 455 225 114 57.1 29.9 14.5 8.13 5.55 FS1:FS0 = 3

MF1:MF0 = 0

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