Rainbow-electronics MAX1402 Manual do Utilizador descarregar pdf (Página 28)

MAX1402

+5V, 18-Bit, Low-Power, Multichannel,

Oversampling (Sigma-Delta) ADC

28 ______________________________________________________________________________________

Table 16b. MAX1402 Noise vs. Gain and Output Data Rate—Buffered Mode,

REF

= 2.5V, f

CLKIN

= 2.4576MHz

PROGRAMMABLE GAIN

x2 x4 x8 x16 x32 x64 x128

MF1:MF0 = 0

FS1:FS0 = 37.8913.5926.0752.48102.18205.60394.00803.8712584800

FS1:FS0 = 37.97

13.3325.7152.98105.18202.57408.09851.32628.8

2400

FS1:FS0 = 23.023.645.269.9218.0836.8073.71148.57314.41200

FS1:FS0 = 11.251.221.291.351.472.243.897.4062.9240

FS1:FS0 = 01.10

1.161.161.241.351.923.216.5552.4

200

MF1:MF0 = 2

FS1:FS0 = 37.87

13.5026.7752.39101.39201.87408.48830.30314.41200

FS1:FS0 = 23.413.925.489.3217.7736.0469.52143.45157.2600

FS1:FS0 = 11.461.451.491.451.642.534.128.3731.4120

FS1:FS0 = 23.213.795.459.5217.3635.9268.92144.96628.82400

FS1:FS0 = 11.311.301.341.401.582.284.147.58125.7480

FS1:FS0 = 01.21

1.171.211.281.382.213.836.60104.8

400

MF1:MF0 = 3

FS1:FS0 = 01.35

1.341.311.341.522.253.668.1026.2

100

MF1:MF0 = 1

FS1:FS0 = 37.78

13.7525.8550.28102.14195.95405.95823.33157.2600

FS1:FS0 = 23.524.105.609.3518.3235.6571.62142.0278.6300

FS1:FS0 = 11.481.491.531.491.642.544.247.1115.760

FS1:FS0 = 0

BIT

STATUS

1.39

TYPICAL OUTPUT NOISE IN µV

RMS

1.371.321.401.502.35

OUTPUT

DATA

RATE

(sps)

4.136.0513.150

-3dB

FREQ.

(Hz)

1482 163264128

GAIN (V/V)b) BUFF = 1a) BUFF = 0

EFFECTIVE RESOLUTION (BITS)

1482 163264128

GAIN (V/V)

EFFECTIVE RESOLUTION (BITS)

FS1: FS0 = 0 OR 1

FS1: FS0 = 2

FS1: FS0 = 3

CLK = 1

FS1: FS0 = 0 OR 1

FS1: FS0 = 2

FS1: FS0 = 3

CLK = 1

BUFF = 1

CLK = 1

BUFF = 0

Figure 8. Effective Resolution vs. Gain and Notch Frequency

Effective Resolution = (SNR

- 1.76dB) / 6.02

The maximum possible signal divided by the noise of

the device, SNR

, is defined as the ratio of the input

full-scale voltage (i.e., 2 · V

REFIN

/ GAIN) to the output

rms noise. Note that it is not calculated using peak-to-

peak output noise numbers. Peak-to-peak noise num-

bers can be up to 6.6 times the rms numbers, while

effective resolution numbers based on peak-to-peak

noise can be 2.5 bits below the effective resolution

based on rms noise, as quoted in the tables.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 39 40

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