CS43L21 datasheet(15/63 Pages) CIRRUS

15 / 63 page

DS723A1

CS43L21

HEADPHONE OUTPUT POWER CHARACTERISTICS

Test conditions (unless otherwise specified): Input test signal is a full-scale 997 Hz sine wave; measurement band-

width is 10 Hz to 20 kHz; Sample Frequency = 48 kHz; test load RL = 16 Ω, CL = 10 pF (see Figure 3).

One-half LSB of triangular PDF dither is added to data.

Full-scale output voltage and power is determined by the gain setting, G, in register “Headphone Analog

Gain (HP_GAIN[2:0])” on page 41. High gain settings at certain VA and VA_HP supply levels may

cause clipping when the audio signal approaches full-scale, maximum power output, as shown in

Figures 21 - 24 on page 55.

See Figure 3. RL and CL reflect the recommended minimum resistance and maximum capacitance re-

quired for the internal op-amp's stability and signal integrity. In this circuit topology, CL will effectively

move the band-limiting pole of the amp in the output stage. Increasing this value beyond the recom-

mended 150 pF can cause the internal op-amp to become unstable.

VA_HP settings lower than VA reduces the headroom of the headphone amplifier. As a result, the DAC

may not achieve the full THD+N performance at full-scale output voltage and power.

Parameter

VA = 2.5V (nominal)

Min

Typ

Max

VA = 1.8V (nominal)

Min

Typ

Max

Unit

AOUTx Power Into RL = 16 Ω

HP_GAIN[2:0]

Analog

Gain (G)

VA_HP

000

0.3959

1.8 V

mWrms

2.5 V

mWrms

001

0.4571

1.8 V

mWrms

2.5 V

mWrms

010

0.5111

1.8 V

mWrms

2.5 V

mWrms

011 (default)

0.6047

1.8 V

(Note 7)

-17

mWrms

2.5 V

mWrms

100

0.7099

1.8 V

(Note 7)

-23

mWrms

2.5 V

mWrms

101

0.8399

1.8 V

(Note 5)

mWrms

2.5 V

-32

mWrms

110

1.0000

1.8 V

(Note 5, 7)

mWrms

2.5 V

mWrms

111

1.1430

1.8 V

mWrms

2.5 V

mWrms

AOUTx

AGND

0.022

µF

Ω

Figure 3. Headphone Output Test Load

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