CDB42L55 Cirrus Logic Inc, CDB42L55 Datasheet - Page 19

• Manufacturer Part Number: CDB42L55
• Description: Eval Bd Ultra Low Power Stereo Codec
• Manufacturer: Cirrus Logic Inc

Specifications of CDB42L55

• Main Purpose: Audio, CODEC
• Embedded: Yes, FPGA / CPLD
• Utilized Ic / Part: CS42L55
• Primary Attributes: 2 Stereo Analog Inputs, Stereo Line and Headphone Outputs, S/PDIF Transmitter and Receiver
• Secondary Attributes: GUI, USB, RS232, I2C Interfaces, USB or External or Battery Power Supply
• Product: Audio Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 598-1506; CDB-42L55

DS773DB1
6 PERFORMANCE PLOTS
Test conditions (unless otherwise specified): T
997 Hz sine wave; dB values relative to full-scale output; measurement bandwidth 20 Hz to 20 kHz (un-weighted);
sample frequency = 48 kHz; +2 dB analog gain for Line Output path; -4 dB analog gain for Headphone Output path;
headphone test load: R
B
S
d
F
d
B
F
S
Figure 10. THD+N vs Freq. - Analog In to Digital Out
Figure 12. FFT - Analog In to Digital Out @ -1 dBFS
Note:
-100
-120
-140
-100
-20
-40
-60
-80
+0
-60
-65
-70
-75
-80
-85
-90
-95
20
20
50
The total harmonic distortion + noise (THD+N) performance of the ADC in the CS42L55 is determined
by the value of the capacitor on the FILT+ pin. Larger capacitor values yield significant improvement
in THD+N at low frequencies.
2.2 µF capacitor.
50
100
100
200
200
L
= 16 Ω; no LPF option for Headphone Output path.
500
500
Hz
Hz
1k
1k
2k
2k
5k
5k
Fig. 10
10k
10k
A
= 25°C; VA=VCP=VLDO=VL=1.8 V; input test signal is a full-scale
20k
20k
shows the THD+N vs. frequency performance measured with a
Figure 11. THD+N vs Amplitude - Analog In to Digital Out
B
S
d
F
B
S
d
F
Figure 13.
-100
-100
-120
-140
-60
-65
-70
-75
-80
-85
-90
-95
-20
-40
-60
-80
+0
-60
20
50
FFT - Analog In to Digital Out @ -60 dBFS
-50
100
-40
200
500
dBr
-30
Hz
1k
-20
2k
CDB42L55
5k
-10
10k
20k
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