Rainbow-electronics MAX11043 Manual do Utilizador descarregar pdf (Página 14)

MAX11043

4-Channel, 16-Bit, Simultaneous-Sampling ADCs

with PGA, Filter, and 8-/12-Bit Dual-Stage DAC

14 ______________________________________________________________________________________

Filter coefficients A1 and B1 are always 1. B3 is limited

to -1, 0, and 1.

Filter coefficients A2, A3, and B2 are stored as 16-bit

two’s complement values in the range of -4 to +4.

Gain is limited to the following values 2

, 2

-2

, 2

-4

-6

, 2

-8

, and 2

-10

. For better gain resolution, adjust the

Fine Gain A/B/C/D Registers at the input of each filter

set. Fine gain adjustment has a resolution of 16 bits and

a gain range of -4 to +4. Set the RECT bit to rectify the

filter output.

Figures 5–8 show the response to a step input of the

default filters used for ADC trimming.

1/A1

-A2

-1

-A3

OUT

RECT

ABS

-1

Figure 4. Single Programmable 2nd-Order Filter Section

SINC 5 FILTER OUTPUT

MAX11043 fig05

SAMPLE

OUTPUT (LSB)

8642

500

1000

1500

2000

2500

010

Figure 5. Sinc 5 Filter Response to a Step Input

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 31 32

MAX11043 1

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