Cirrus Logic CDB4244 - Manual (Page 16)

16 DS900DB2
CDB4244
Either filter option is realized by populating certain components and removing others. Section 4.3 contains
a comprehensive list of components, and Figure 18 on page 31 contains a silk-screen diagram to aid in lo-
cating each component. Note that because of the grouping of the ADC common-mode voltages of the
CS4244, the filter option used for AIN1 must also be used for AIN2. Likewise, the filter option used for AIN3
must also be used for AIN4. Refer to the CS4244 data sheet for more information.
4.3 Analog Input Filter Configuration
The following table lists the components that must be present or absent in order to realize either filter design
for each of the four input channels. “POPULATE” or a component value specifies that the component should
be populated, while “NO POP” specifies that the component should not be populated.
Notes:
1. Nonzero resistors are specified as 1/10 W with 1% tolerance.
Reference Designator
(AIN1, AIN2, AIN3, AIN4) Description
Active
S/E
→Differential*
Passive
Differential
C78, C43, C86, C139 Electrolytic,
SMT Case B, 20%
16 V
4.7 μF 10 μF
C17, C69, C135, C155 NO POP 10 μF
C84, C47, C124, C152 22 μF NO POP
C79, C44, C87, C140 C0G, SMT 0603, 5%
16 V
470 pF NO POP
C80, C45, C88, C141 470 pF NO POP
C41, C77, C137, C157 2700 pF 240 pF
C89, C48, C125, C153 X7R, SMT 0603, 5%
25 V
0.01 μF NO POP
C122, C68, C134, C154 0.01 μF NO POP
C82, C46, C123, C151 0.01 μF NO POP
R29, R78, R207, R234 SMT 0603
(Note 1)
NO POP 100 k Ω
R26, R73, R203, R230 0 Ω NO POP
R18, R72, R202, R229 0 Ω NO POP
R12, R71, R201, R228 0 Ω NO POP
R27, R74, R204, R231 NO POP 0 Ω
R30, R77, R206, R233 NO POP 0 Ω
R32, R88, R209, R236 0 Ω 2.0 k Ω
R33, R89, R210, R237 0 Ω 2.0 k Ω
R35, R91, R212, R239 NO POP 16.0 k Ω
R79, R36, R133, R213 634 Ω NO POP
R81, R38, R135, R215 634 Ω NO POP
R80, R37, R134, R214 634 Ω NO POP
R83, R40, R137, R217 91 Ω NO POP
R82, R39, R136, R216 91 Ω NO POP
R84, R41, R138, R218 100 k Ω NO POP
R86, R42, R139, R219 100 k Ω NO POP
R87, R43, R140, R220 100 k Ω NO POP
U5, U7, U10, U11 NE5532D, SOP-8 POPULATE NO POP
*Default factory setting
Table 1. Analog Input Filter Components