CDB4385A View Datasheet(PDF) - Cirrus Logic
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Description
Manufacturer
CDB4385A Datasheet PDF : 31 Pages
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8. PERFORMANCE PLOTS
CDB4385A
The plots in the following section were acheived using an Audio Precision System 2700 and a randomly chosen pro-
duction CDB4385A. In some cases performance may be limited by the CDB4385A. 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).
+0
-10
-20
-30
-40
-50
-60
d
B
-70
r
-80
A
-90
-100
-110
-120
-130
-140
-150
20
50
100
200
500
1k
2k
Hz
Figure 1. FFT (48 kHz, 0 dB)
+0
-10
-20
-30
-40
-50
-60
d
B
-70
r
-80
A
-90
-100
-110
-120
-130
-140
5k
10k 20k
-150
20
50
100
200
500
1k
2k
5k
Hz
Figure 2. FFT (48 kHz, -60 dB)
10k 20k
+0
-10
-20
-30
-40
-50
-60
d
B
-70
r
-80
A
-90
-100
-110
-120
-130
-140
-150
20
50
100
200
500
1k
2k
5k
Hz
Figure 3. FFT (48 kHz, No Input)
+0
-10
-20
-30
-40
-50
-60
d
B
-70
r
-80
A
-90
-100
-110
-120
-130
-140
10k 20k
-150
20k
40k
60k
80k
100k
120k
Hz
Figure 4. FFT (48 kHz Out-of-Band, No Input)
DS837DB1
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