MAS9560 datasheet(3/25 Pages) MAS

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DA9560.001

20 January, 2005

DETAILED BLOCK DESCRIPTION

◆ DAC

MAS9560 contains two digital-to-analog converters

(DACs), which values are set through I

2S bus (see

2S section for further description). The sampling

rate of DACs is defined by WSI or CLI. In over

sampling mode the sampling frequency is the

frequency of CLI pin divided by four (fCLI/4). WSI is

used as a sampling clock in default mode.

◆ Audio Drivers

MAS9560 contains three audio drivers, all of which

can be used simultaneously or separately. One

driver is for loudspeaker, one for earpiece and one

for headphone. The two latter ones have analog

volume control from –30 dB gain to +6 dB gain in

1.5 dB steps, whereas the control range for

loudspeaker driver is from –30 dB to +12 dB in 1.5

dB steps (see Control Register section p.18) The

main features of each driver is as follows:

Loudspeaker Driver: mono, differential output,

output power: 410 mW @ VDD = 2.7 V, 1100

mW @ VDD = 5.0 V

Earpiece Driver: mono, differential output,

output power: 100 mW @ VDD = 2.7 V, 300 mW

@ VDD = 5.0 V

Headphone Driver: stereo, single-ended output,

output power: 25 mW @ VDD = 2.7 V, 80 mW

@ VDD = 5.0 V

All the drivers are short-circuit protected.

◆ Digital Audio Interface

Inter-IC Sound (I

2S) bus is a 3-wire serial interface

for transmission of 2-channel (stereo) Pulse Code

Modulation digital data between MAS9560 and

external digital audio source, for example MP3

player.

◆ LDO Voltage Regulator

MAS9560 has integrated low dropout voltage

regulator, which output voltage is fixed 2.86 V. In

power supply noisy environments the usage of this

LDO in powering headphone and earpiece drivers

improves the PSRR of these drivers to 100 dB and

over. 10 nF bypass capacitor can be connected to

CBP pin further improving the performance. In case

LDO is not used (non-LDO mode) its output pin

(VLDO) must be connected to external voltage

source since it is supplying power for analog front-

end.

The integrated LDO can also be disabled by using

Mode-Control-Register.

◆ Reference Block

The reference block, which provides reference level

for analog audio signals, has two modes:

LDO mode: Audio reference level = VLDO/2.

(SREF pin). This is half of integrated voltage

regulator's output voltage.

Non-LDO mode: Audio reference level =

VLDO/2. VLDO should be connected to VBAT

in Non-LDO mode.

◆ I

2C/SPI Control Interface

MAS9560 has many user selectable options. These

selections are mainly made by using registers,

which are programmed via one of the two standard

control interface protocols: I

2C or SPI. The used

control interface type is selected with MODE pin.

◆ Registers

MAS9560 has 11 on-chip registers, which byte

length is 8 bits. Reset register is write-only, all other

registers permit read and write access.

◆ Power Management

MAS9560 has Block Control Register, which allows

separate blocks to be turned on and off

independently. This can be used to reduce power

consumption, since typically all the blocks are not

needed at the same time. If, for example, only

loudspeaker is used as an output, the drivers for

earpiece and headphone can be disabled.

Additionally MAS9560 has Mode Control Register,

which can be used to select operating mode for

MAS9560. These four modes are as follows:

Zero Power, where all digital and analog blocks

are in power down mode. This is a default

mode after startup.

Analog stand-by, which is intended to be used

as a wait state when starting the device. The

purpose of this operating mode is to suppress

audible plops caused by abrupt amplification

changes when blocks in audio chain are waking

up.

Aux to Line, where DACs are disabled and only

analog signaling is used.

Full Power, where all blocks are active.

◆ Temperature Protection

MAS9560 is equipped with over temperature

protection.

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