MAX11043 Maxim Integrated Products, MAX11043 Datasheet - Page 14

• Manufacturer Part Number: MAX11043
• Description: Simultaneous Sampling ADCs
• Manufacturer: Maxim Integrated Products

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4-Channel, 16-Bit, Simultaneous-Sampling ADCs
with PGA, Filter, and 8-/12-Bit Dual-Stage DAC
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
Figure 4. Single Programmable 2nd-Order Filter Section
Figure 5. Sinc 5 Filter Response to a Step Input
14
-6
, 2
______________________________________________________________________________________
IN
-8
, and 2
2500
2000
1500
1000
500
0
0
-10
. For better gain resolution, adjust the
+
+
2
SINC 5 FILTER OUTPUT
4
SAMPLE
1/A1
-A2
-A3
6
8
4
, 2
10
2
Z
Z
, 2
-1
-1
X
Y
0
, 2
-2
, 2
-4
,
B1
B2
B3
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.
RECT
+
+
ABS
G
OUT