AS3515_08 datasheet(14/67 Pages) AMSCO

14 / 67 page

AS3515 V15

austriamicrosystems

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 3.1

- 66

6.3

Speaker Output

6.3.1

General

The speaker output is designed to provide the stereo audio signal with 2x500mW @ 4

Ω.

This output stage has an independent gain regulation for left and right channel with 32 steps @ 1.5dB each. The gain can be set from

−40.5dB to +6dB. The maximum output power of 500mW @ 4Ω is achieved, by setting the mixer output to 1Vp and using the gain of

+6dB.

Figure 4 Speaker Output

6.3.2

No-Pop Function

BGND pin, which needs a 100nF capacitor outside, gets charged on power-up to BVDD/2.To avoiding click and pop noise during power-

up and shutdown, the output is automatically set to mute when the output stage is disabled.

The Start-up time before releasing mute is about 100ms. To avoid pop-noise the 150ms discharging time of SPR / SPL after a shutdown

(220µF capacitor in stereo single ended mode assumed), have to be waited before starting up again.

6.3.3

Over-current Protection

This output stage has an over-current protection, which disables the output for 0 to 512ms. This value can be set in the speaker registers.

The over-current protection limit of SPR and SPL pin is typical 700mA. To get an interrupt on an over-current event, the corresponding bit

in the IRQ_ENRD1 register (0x26h) has to be set.

6.3.4

Power Save Options

When driving > 4

Ω, two power save options can be chosen.

The output driver stage can be set to only 25% drive capacity, which will reduce the maximum output power. Additionally the bias currents

can be reduced to 50% in 3 steps.

Table 11 Speaker Power-Save Options

LSP_LP

IBR_LSP IDD_HPH (typ.)

Load

8mA

4 Ohm

2.8mA

16-32 Ohm

2.4mA

16-32 Ohm

1.9mA

16-32 Ohm

1.5mA

16-32 Ohm

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

AS3515 Datasheet(PDF) 14 Page - ams AG

AS3515 Datasheet(HTML) 14 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

Datasheet Download

Link URL