Owner's manual

DS782F2 11
CS4349
Figures 3 through 5 show typical THD+N performance for CS4349 devices that exhibit the maximum full
scale output 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.
AOUTx +
3.3 µF
Analog
Output
+
GND
R
L
C
L
100
50
75
25
2.5
51015
Safe Operating
Region
Capacitive Load -- C (pF)
L
Resistive Load -- R (k  )
L
125
3
20
Figure 1. Output Test Load Figure 2. Maximum Loading
CS4349
-3-2.5-2-1.5-1-0.50
-100
-90
-80
-70
-60
-50
-40
-30
Output Amplitude(dB)
THD+N (dB)
TA = -40° C
TA = 25° C
TA = 85° C
-3-2.5-2-1.5-1-0.50
-100
-90
-80
-70
-60
-50
-40
-30
Output Amplitude(dB)
THD+N (dB)
TA = -40° C
TA = 25° C
TA = 85° C
Figure 3. THD+N vs Output Amplitude for VA = 5.0 V Figure 4. THD+N vs Output Amplitude for VA = 3.3 V
-3-2.5-2-1.5-1-0.50
-100
-90
-80
-70
-60
-50
-40
-30
Output Amplitude(dB)
THD+N (dB)
TA = -40° C
TA = 25° C
TA = 85° C
Figure 5. THD+N vs Output Amplitude for VA = 3.14 V