AS3517H-ECTP datasheet(23/94 Pages) AMSCO

23 / 94 page

AS3517 V17

Data Sheet, Confidential

www.austriamicrosystems.com

Over-current Protection

The headphone amplifier has an over-current protection (e.g. HPR/HPL is shorted). This over-current protection will power the headphone

amplifier down for a programmable timeout period (512ms, 256ms, 128ms). The current threshold is at 150mA for HPR/HPL and 300mA

for HPCM. There is a corresponding interrupt available to be enabled.

Headphone Detection

When the headphone amplifier is powered down, one can detect the connection of a headset. It only work if the headset is connected

between pins HPR/HPL and HPCM. As long as the headphone amplifier is powered down, HPCM is biased to 150mV and acting as the

sense pin. There is a corresponding interrupt available to be enabled.

Power Save Options

To save power, especially when driving 32 Ohm loads, a reduction of the bias current can be selected. Together with switching off the

phantom ground this gives 4 possible operating modes.

Table 16 Headphone Power-Save Options

HPCM_OFF

IBR_HPH

IDD_HPH (typ.)

Load

2.2mA

16 Ohm

1.5mA

16 Ohm

1.5mA

32 Ohm

1.0mA

32 Ohm

BVDD = 3.3V, TA= 25oC unless otherwise mentioned

Parameter

Table 17 Power Amplifier Block Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

RL_HP

Load Impedance

Ω

stereo mode

CL_LO

Load Capacitance

100

stereo mode

PHP

Nominal Output Power

40mW

20mW

RL=16Ω, limiter enabled

RL=32Ω, limiter enabled

PHP_MAX

Max. Output Power

60mW

30mW

RL=16Ω

RL=32Ω

ALO

Programmable Gain

-45.5

Gain Steps

1.5

discrete logarithmic gain

steps

Gain Step Accuracy

±0.25

Over current limit

150

300

HPR/HPL pins

HPCM pin

PSRRHP

Power Supply Rejection Ratio

200Hz-20kHz, 720mVpp,

RL=16Ω

ALOMUTE

Mute Attenuation

100

BVDD = 3.3V, TA= 25oC unless otherwise mentioned

Table 18 Headphone Related Register

Name

Base

Offset

Description

HPH_OUT_R

2-wire serial

02h

Right HP Output volume and over-current settings

HPH_OUT_L

2-wire serial

03h

Left HP Output volume settings, enable and detection control

AudioSet_3

2-wire serial

16h

Power save options, common mode buffer

IRQ_ENRD_3

2-wire serial

26h

Interrupt settings for over current and HP detection

Revision 1v3

- 93

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