CRD-5381 Cirrus Logic Inc, CRD-5381 Datasheet - Page 7

• Manufacturer Part Number: CRD-5381
• Description: Audio Modules & Development Tools Ref Bd high perfm ADC & SRC
• Manufacturer: Cirrus Logic Inc

Specifications of CRD-5381

• Description/function: Audio A/D
• Operating Supply Voltage: 3.3 V
• Product: Audio Modules
• For Use With/related Products: CS5381, CS8421
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS563RD1
1.3
The transition-band response of the CRD5381 is due to the combination of the digital filtering performed by both the
CS5381 and the CS8421. Due to the superior stop-band rejection of the CS8421, the combination of the two parts
yields a better stop-band rejection then the CS5381 alone. When the output sample rate is close to that of the
CS5381, signals that fall within the transition-band spectrum will already have been aliased down into the pass-band
prior to the CS8421’s output filter. This can be seen in
approximately 97.5 kHz represent signals that have been aliased downward prior to the action of the CS8421 output
filter.
Filter Response
B
F
S
d
-100
-105
-110
-115
-120
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
-85
-90
-95
+0
-5
20k
20.5k
21k
Figure 1. Transitional Band, 48 kHz Out
21.5k
22k
22.5k
Figure 3 on page
23k
Hz
23.5k
24k
8, where the signals above the notch at
24.5k
25k
25.5k
26k
CRD5381
7