DA9560.001
20 January, 2005
MAS9560
This is preliminary information on a new
product under development. Micro Analog
Systems Oy reserves the right to make any
changes without notice.
Stereo Audio Driver DAC
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16-Bit Stereo Audio DAC
Stereo Headphone Drivers
Mono Earpiece Driver
Mono Loudspeaker Driver
Mixing of Analog and Digital
Audio Signals
Integrated LDO
Flexible Power Down Control
DESCRIPTION
The MAS9560 Stereo Audio DAC chip is specially
intended to audio applications in portable devices. It
has both analog and digital inputs for audio data thus
enabling the mixing of signals. MAS9560 is equipped
with integrated high performance LDO, which
ensures high quality of output signal even in noisy
power supply environment. MAS9560 has three
audio outputs (for headphone, earpiece and
loudspeaker) making it an ideal choice for space
critical applications. Since current consumption is a
critical factor in portable devices, MAS9560 has
flexible power down control enabling the shutting
down of the parts of the circuit that are not in use.
FEATURES
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16-Bit Stereo Audio DAC
Stereo Headphone Drivers (25 mW)
Mono Earpiece Driver (100 mW)
Mono Loudspeaker Driver (410 mW)
-50 dB to 32 dB Analog Volume Control
Mute for All Volume Controls
Analog and Digital Signal Mixing
Integrated LDO
Flexible Power Down Control
Audio Sample Rates from 8 kHz to 48 kHz
I
2
C/SPI Compatible Serial Control Port
I
2
S Digital Audio Interface
Supply Voltage Range 2.7 V to 5.5 V
Digital I/O Voltage Range 1.8 V to 5.5 V
Package QFN 6x6 40ld
Compatible with DAC3560C
APPLICATIONS
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Portable devices with sophisticated audio
functions:
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Cell Phones
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PDAs
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MP3 players with integrated AM/FM radio
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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
2
S bus (see
I
2
S 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 (f
CLI
/4). WSI is
used as a sampling clock in default mode.
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
2
C/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
2
C or SPI. The used
control interface type is selected with MODE pin.
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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.
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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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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 @ V
DD
= 2.7 V, 1100
mW @ V
DD
= 5.0 V
Earpiece Driver: mono, differential output,
output power: 100 mW @ V
DD
= 2.7 V, 300 mW
@ V
DD
= 5.0 V
Headphone Driver: stereo, single-ended output,
output power: 25 mW @ V
DD
= 2.7 V, 80 mW
@ V
DD
= 5.0 V
All the drivers are short-circuit protected.
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Digital Audio Interface
Inter-IC Sound (I
2
S) 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.
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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.
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Reference Block
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DA9560.001
20 January, 2005
Pin Name
Pin
Number
Type
I
I
O
G
O
O
P
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O
I
G
O
P
O
G
G
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-
P
Function
Analog Auxiliary (AUX) Input Left Channel (Stereo)
Analog Auxiliary (AUX) Input Right Channel (Stereo)
Headphone Common Output
GND for Headphone Driver
Headphone Output (Left Channel)
Headphone Output (Right Channel)
Power Supply Voltage for Headphone Driver
Not Connected
Audio Signal Reference Level
Pin for LDO Bypass Capacitor
Earpiece Ground
Earpiece Differential Output (Negative)
Power Supply for Earpiece Driver
Earpiece Differential Output (Positive)
GND for Earpiece Driver
Analog Ground
Not Connected
Not Connected
LDO Output (Analog Power Supply)
Exposed pad should be soldered to GND layer to improve heat
dissipation
AUXL
22
AUXR
23
HPCM
24
HPVSS
25
HPL
26
HPR
27
HPVDD
28
N/C
29
SREF
30
CBP
31
EPVSS2
32
EPN
33
EPVDD
34
EPP
35
EPVSS1
36
AVSS
37
N/C
38
N/C
39
VLDO (AVDD)
40
Exposed Pad
Note:
Pins EPVDD and HPVDD have to be connected to VLDO pin.
DETAILED PIN DESCRIPTIONS
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Power supply pins
The power supply of MAS9560 is divided into
functional sections so that:
DVSS is connected internally with all digital
parts
IOVDD and DVSS are connected internally with
all digital inputs and outputs
DVSS is ground connection for all digital parts
All GND pins are internally connected together
LSVDD and VBAT are internally connected
together
Other power supply pins should be connected as
follows:
VLDO should be connected to VBAT in non-
LDO mode. If LDO mode is selected, VLDO is
the output of LDO.
HPVDD and EPVDD can be driven by VLDO in
LDO mode to reduce power supply noise
HPVSS, EPVSS, LSVSS must be connected to
analog ground (AVSS). The pins are internally
connected together.
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