cs5364 Cirrus Logic, Inc., cs5364 Datasheet - Page 28

• Manufacturer Part Number: cs5364
• Description: 114 Db, 192 Khz, 4-channel A/d Converter
• Manufacturer: Cirrus Logic, Inc.

28
4.10
Analog Connections
The analog modulator samples the input at half of the internal Master Clock frequency, or 6.144 MHz nom-
inally. The digital filter will reject signals within the stopband of the filter. However, there is no rejection of
input signals that are at (N X 6.144 MHz) the digital passband frequency, where n=0,1,2.... Refer to
Figure
providing the optimum source impedance for the modulators. The use of capacitors that have a large volt-
age coefficient (such as general-purpose ceramics) must be avoided since these can degrade signal linear-
ity. COG capacitors are recommended for this application. For additional configurations, refer to Cirrus
Application Note AN241.
15, which shows the suggested filter that will attenuate any noise energy at 6.144 MHz in addition to
100kΩ
100kΩ
AIN+
AIN-
10 uF
10 uF
Figure 15. Recommended Analog Input Buffer
10 k Ω
10 k Ω
+
+
-
-
634 Ω
634 Ω
VQ
COG
470 pF
470 pF
COG
91 Ω
91 Ω
2700 pF
COG
ADC AIN-
ADC AIN+
CS5364
DS625F3