AS3658F-BCTP datasheet(114/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Detail ed Descri ption- Audio Functi ons

9.11.4 Power Save Options

To save power, especially when driving 32

Ω loads, a reduction of the bias current can be selected.

Bias current reduction settings for headphone output:

00: 0%

01: 17%

10: 34%

11: 50%

9.11.5 Parameters

Table 118. Power Amplifier Parameter

Parameter

Min

Typ

Max

Unit

9.11.6 Register Description

To get an interrupt on an over-current event, the corresponding bit in the Interrupt enable register has to be set.

Changing the bias current or the output driver strength is done via AudioSet2 register. All other headphone driver

settings are controlled by the following two registers.

Analog Performance

R_Load at AOUTR and AOUTL single ended

Vout

1.13

Gain Step Precision (RLmin-max,20Hz-20kHz)

±0.5

SINAD no load, LineIn-> HPH, A-weighted

-97

THD @ 1kHz, no load

-88

THD @ 1kHz, 32

Ω, 10mW

-80

THD @ 1kHz, 32

Ω, 20mW

-74

-66

THD @ 1kHz, 16

Ω, 40mW

-68

-60

Channel Separation (32

Ω, dc-coupled)

PSRR (200Hz-20kHz)

Shorted Protection Level

260

Shorted Protection Level of common mode buffer

370

IOUT_powerdown

-20

µA

Tpower_up (HP_CM=0.1µF)

150

GND cancellation GND - AUDIO_GND to

HP_R, HP_L no load

100Hz

1kHz

10kHz

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