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Ultra Low Power Audio Subsystem
DESCRIPTION
The WM9090
[1]
is a high performance low power audio
subsystem with integrated headphone driver and Class D
speaker driver. The speaker driver supports 750mW output
power at 3.7V, 1%THD.
The unique dual mode charge pump architecture provides
ground referenced headphone outputs, removing the
requirement for external coupling capacitors. Class G
technology is integrated to increase the efficiency and
extend playback time by optimizing the headphone driver
supply voltages according to the volume control.
The flexible input configuration allows single ended or
differential stereo inputs. Mixers allow highly flexible routing
to the outputs.
Separate mixer and volume controls are provided for each
headphone and speaker driver. Automatic Gain Control
limits the speaker output signal in order to prevent clipping.
DC offset correction to less than 1mV guarantees a
pop/click-free headphone start up.
WM9090 is controlled using a two-wire I2C interface. An
integrated oscillator generates all internal clocks, removing
the need to provide any external clock.
WM9090 is available in a 2.53mm x 2.07mm 20-bump CSP
package.
WM9090
FEATURES
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Mono Class D speaker driver
2W at 5V SPKVDD @ 1% THD+N into 4Ω
950mW at 4.2V SPKVDD @ 1% THD+N into 8Ω
90dB SNR
Ground referenced stereo headphone driver
35mW into 16Ω load @ 1% THD+N
95dB SNR
80dB THD+N
Differential and single ended analogue input configurations
Integrated oscillator for clocking requirements
I
2
C 2-wire software control interface
Automatic gain control (AGC) for speaker output
SilentSwitch™ Pop and click suppression
< 1mV DC offset
<50ms start up time
Excellent RF and TDMA noise immunity
Ultra low power consumption
4mW quiescent for headphone driver
5mW quiescent for speaker driver
Shutdown current < 1uA
Supply voltage
SPKVDD = 2.7V to 5.5V
AVDD = 1.8V
1.8V to 2.7V control interface compatibility
20-bump CSP package
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APPLICATIONS
•
Mobile handsets
BLOCK DIAGRAM
SPKVDD
Automatic Gain
Control
Boost Amplifier
Class D Driver
+
VMID
-6dB to 18dB
+6dB to -57dB in
1dB steps
0dB, -6dB,
-9dB, -12dB
+6dB to -57dB
in 1dB steps
IN1P
IN1N
SPKOUTP
SPKOUTN
Speaker
-6dB to 18dB
VMID
+
0dB, -6dB,
-9dB, -12dB
HPOUTL
DC Offset Correction
IN2P
IN2N
VMID
-6dB to 18dB
+6dB to -57dB
in 1dB steps
+
HPOUTR
DC Offset Correction
-6dB to 18dB
0dB, -6dB,
-9dB, -12dB
CPVOUTP
Charge
Pump
CPVOUTN
CPCA
CPCB
VMID
WM9090
Control Interface
SCLK
SDA
VMIDC
GND
AVDD
WOLFSON MICROELECTRONICS plc
[1] This product is protected by US Patents 7,622,984 and 7,626,445
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Production Data, November 2010, Rev 4.1
Copyright
©2010
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
