CS4349
125
100
CS4349
3.3 µF
+
75
50
Analog
Output
AOUTx +
Safe Operating
Region
RL
CL
25
GND
2.5
5
10
15
20
3
Resistive Load -- R (kΩ )
L
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 page 9 and 10). 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
-40
-50
-60
-70
-80
-90
-100
-30
-40
-50
-60
-70
-80
-90
-100
TA = -40° C
TA = 25° C
TA = 85° C
TA = -40° C
TA = 25° C
TA = 85° C
0
-0.5
-1
-1.5
-2
-2.5
-3
0
-0.5
-1
-1.5
-2
-2.5
-3
Output Amplitude(dB)
Output Amplitude(dB)
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
TA = -40° C
TA = 25° C
TA = 85° C
-40
-50
-60
-70
-80
-90
-100
0
-0.5
-1
-1.5
-2
-2.5
-3
Output Amplitude(dB)
Figure 5. THD+N vs Output Amplitude for VA = 3.14 V
DS782F1
11
CIRRUS [ CIRRUS LOGIC ]
