DS782F1

11

CS4349

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.

AOUTx +

3.3 µF

Analog

Output

+

GND

100

50

75

25

2.5

510

15

Safe Operating

Region

Resistive Load -- R (k

Ω )

L

125

3

20

Figure 1. Output Test Load

Figure 2. Maximum Loading

CS4349

-3

-2.5

-2

-1.5

-1

-0.5

0

-100

-90

-80

-70

-60

-50

-40

-30

Output Amplitude(dB)

TA = -40° C

TA = 25° C

TA = 85° C

-3

-2.5

-2

-1.5

-1

-0.5

0

-100

-90

-80

-70

-60

-50

-40

-30

Output Amplitude(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

-0.5

0

-100

-90

-80

-70

-60

-50

-40

-30

Output Amplitude(dB)

TA = -40° C

TA = 25° C

TA = 85° C

Figure 5. THD+N vs Output Amplitude for VA = 3.14 V