CDB42438 Cirrus Logic Inc, CDB42438 Datasheet - Page 50

• Manufacturer Part Number: CDB42438
• Description: Eval Bd 108dB 6&8ch Multi-Chnl CODECs
• Manufacturer: Cirrus Logic Inc

Specifications of CDB42438

• Main Purpose: Audio, CODEC
• Embedded: Yes, FPGA / CPLD
• Utilized Ic / Part: CS42438
• Primary Attributes: 6 Single-Ended and 2 Differential Analog Inputs and 8 Outputs, S/PDIF Transmitter and Receiver
• Secondary Attributes: Graphic User Interface
• Description/function: Audio CODECs
• Operating Supply Voltage: 5 V to 12 V
• Product: Audio Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: CS42438
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant, Contains lead / RoHS non-compliant
• Other names: 598-1500

50
8. EXTERNAL FILTERS
8.1
ADC Input Filter
The analog modulator samples the input at 6.144 MHz (internal MCLK=12.288 MHz). The digital filter will
reject signals within the stopband of the filter. However, there is no rejection for input signals which are mul-
tiples of the digital passband frequency (n
a recommended analog input filter that will attenuate any noise energy at 6.144 MHz, in addition to providing
the optimum source impedance for the modulators. Refer to
count passive input filters. The use of capacitors that have a large voltage coefficient (such as general-pur-
pose ceramics) must be avoided since these can degrade signal linearity
100 k Ω
100 k Ω
100 k Ω
4.7 μF
VA
Figure 20. Single to Differential Active Input Filter
100 kΩ
0.1 μF
100 kΩ
100 kΩ
10 k Ω
Figure 21. Single-Ended Active Input Filter
-
+
4.7 μF
4.7 μF
4.7 μF
470 pF
100 μF
C0G
100 kΩ
100 kΩ
100 kΩ
100 kΩ
100 kΩ
100 kΩ
VA
VA
VA
332 Ω
634 Ω
634 Ω
91 Ω
×
+
+
-
-
+
-
6.144 MHz), where n=0,1,2,... Refer to
470 pF
470 pF
470 pF
C0G
C0G
C0G
-
+
470 pF
634 Ω
C0G
634 Ω
91 Ω
634 Ω
91 Ω
91 Ω
634 Ω
Figures 22
4.7 μF
91 Ω
2700 pF
2700 pF
2700 pF
C0G
C0G
C0G
AIN1+,2+,3+,4+
AIN1-,2-,3-,4-
AIN5A,6A
AIN5B,6B
2700 pF
and
C0G
ADC1-2
ADC3
23
for low-cost, low-component-
AINx+
AINx-
Figures 20
ADC1-3
CS42438
and
DS646F2
21
for