CDB4365 Cirrus Logic Inc, CDB4365 Datasheet - Page 7

• Manufacturer Part Number: CDB4365
• Description: EVALUATION BOARD FOR CS4365
• Manufacturer: Cirrus Logic Inc

Specifications of CDB4365

• Number Of Dac's: 6
• Number Of Bits: 24
• Outputs And Type: 6, Differential
• Sampling Rate (per Second): 192k
• Data Interface: Serial
• Dac Type: Voltage
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: CS4365
• Description/function: Audio D/A
• Operating Supply Voltage: 5 V
• Product: Audio Modules
• For Use With/related Products: CS4365
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1779

DS670DB3
8. PERFORMANCE PLOTS
The plots in the following section were acheived using an Audio Precision System 2700 and a randomly chosen pro-
duction CDB4365. In some cases the performance may be limited by the CDB4365. All measurements were taken
at room temp using the standard AP filter options (20 Hz to 22 kHz) with default board settings and nominal
datasheet voltages applied unless otherwise noted.
The impulse response plots were taken both pre-and post filtering as the off-chip filter was degrading the perfor-
mance at higher sample rates. The pre-filter impulse response plots were taken directly at the output pins of the
DAC (with the analog filter still connected) to show the effect of the CDB’s analog filtering on the impulse response
(as the analog filtering adds its own signature to the impulse response of the DAC, and in the case of the higher
sampling rates it was band-limiting it).
d
B
A
r
d
B
A
r
-100
-110
-120
-130
-140
-150
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
+0
20
20
Figure 3. FFT (48 kHz, No Input)
50
Figure 1. FFT (48 kHz, 0 dB)
50
100
100
200
200
500
500
Hz
Hz
1k
1k
2k
2k
5k
5k
10k
10k
20k
20k
B
A
d
r
B
A
d
r
-100
-110
-120
-130
-140
-150
-100
-110
-120
-130
-140
-150
-10
-20
-30
-40
-50
-60
-70
-80
-90
-10
-20
-30
-40
-50
-60
-70
-80
-90
+0
+0
20
Figure 4. FFT (48 kHz Out-of-Band, No Input)
50
20k
Figure 2. FFT (48 kHz, -60 dB)
100
40k
200
500
60k
Hz
Hz
1k
80k
2k
CDB4365
5k
100k
10k
20k
120k
7