WM9090 Datasheet, PDF (1/81 Pages) Wolfson Microelectronics plc – Ultra Low Power Audio Subsystem

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WM9090
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.
BLOCK DIAGRAM
FEATURES
• 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
• I²C 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
APPLICATIONS
• Mobile handsets
SPKVDD
IN1P
IN1N
IN2P
IN2N
VMID ^{-6dB to 18dB}
-6dB to 18dB
VMID
VMID ^{-6dB to 18dB}
+
0dB, -6dB,
-9dB, -12dB
+
Automatic Gain
Control
Boost Amplifier
Class D Driver
+6dB to -57dB in
1dB steps
SPKOUTP
SPKOUTN
+6dB to -57dB
in 1dB steps
HPOUTL
0dB, -6dB,
-9dB, -12dB
DC Offset Correction
+6dB to -57dB
in 1dB steps
HPOUTR
+
Speaker
-6dB to 18dB
VMID
0dB, -6dB,
-9dB, -12dB
WM9090
Control Interface
SCLK SDA
VMIDC
WOLFSON MICROELECTRONICS plc
[1] This product is protected by US Patents 7,622,984 and 7,626,445
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DC Offset Correction
Charge
Pump
CPVOUTP
CPVOUTN
CPCA
CPCB
GND AVDD
Production Data, November 2010, Rev 4.1
Copyright ©2010 Wolfson Microelectronics plc