CS4349
125
Capacitive Load -- C L (pF)
100
75
50
25
Safe Operating
Region
CS4349
AOUTx +
3.3 µF
+
Analog
Output
R
L
C
L
GND
2.5
3
5
10
15
20
Resistive Load -- R
L
(k
Ω
)
Figure 1. Output Test Load
Figure 2. Maximum Loading
Figures 3 through 5 show typical THD+N performance for CS4349 devices that exhibit the maximum full scale out-
put voltages as specified in the DAC Analog Characteristics tables (see
and
With decreasing VA,
THD+N performance is increasingly affected by the full scale output voltage and temperature, with higher full scale
output voltage and lower temperatures corresponding to lower THD+N performance.
-30
TA = -40° C
TA = 25° C
TA = 85° C
-30
-40
-50
THD+N (dB)
-40
-50
THD+N (dB)
-60
-70
-80
-90
-100
0
TA = -40° C
TA = 25° C
TA = 85° C
-60
-70
-80
-90
-100
0
-0.5
-1
-1.5
-2
Output Amplitude(dB)
-2.5
-3
-0.5
-1
-1.5
-2
Output Amplitude(dB)
-2.5
-3
Figure 3. THD+N vs Output Amplitude for VA = 5.0 V
Figure 4. THD+N vs Output Amplitude for VA = 3.3 V
-30
-40
-50
THD+N (dB)
-60
-70
-80
-90
-100
0
TA = -40° C
TA = 25° C
TA = 85° C
-0.5
-1
-1.5
-2
Output Amplitude(dB)
-2.5
-3
Figure 5. THD+N vs Output Amplitude for VA = 3.14 V
DS782F1
11
CIRRUS [ CIRRUS LOGIC ]
