Cirrus-logic CS4349 Manual do Utilizador descarregar pdf (Página 11)

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

100

2.5

51015

Safe Operating

Region

Capacitive Load -- C (pF)

Resistive Load -- R (k



)

125

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

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 38 39

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