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