CS42L51 Datasheet, PDF(19/83 Page) Cirrus Logic – Low Power, Stereo CODEC with Headphone Amp

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CS42L51 Datasheet, PDF (19/83 Pages) Cirrus Logic – Low Power, Stereo CODEC with Headphone Amp

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CS42L51

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 â¦, CL = 10 pF (see Figure 3).

Parameter

AOUTx Power Into RL = 16 â¦

HP_GAIN[2:0] Analog

Gain (G)

VA_HP

000

0.3959

1.8 V

2.5 V

001

0.4571

1.8 V

2.5 V

010

0.5111

1.8 V

2.5 V

011 (default)

0.6047

1.8 V

2.5 V

100

0.7099

1.8 V

2.5 V

101

0.8399

1.8 V

2.5 V

110

1.0000

1.8 V

2.5 V

111

1.1430

1.8 V

2.5 V

VA = 2.5V

Min

Typ

Max

VA = 1.8V

Min

Typ

Max Unit

(Note 12)

(Note 10)) See Figure 28 on

page 72

mWrms

(Note 10, 12) See Figures 28 and 29 on page 72

mWrms

Notes:

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

10. Full-scale output voltage and power is determined by the gain setting, G, in register âHeadphone Analog

Gain (HP_GAIN[2:0])â on page 54. 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 28 - 31 on page 73.

11. 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.

12. 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.

AOUTx

51 â¦

0.022 ÂµF

AGND

Figure 3. Headphone Output Test Load

DS679A2

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