wm9010 Wolfson Microelectronics plc, wm9010 Datasheet - Page 9

• Manufacturer Part Number: wm9010
• Description: Low Power, Class G Stereo Headphone Driver
• Manufacturer: Wolfson Microelectronics plc

WM9010
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Figure 2 External Connections for HPOUTL and HPOUTR
CHARGE PUMP
The WM9010 incorporates a charge pump circuit, which generates the supply rails for the
headphone output drivers. The charge pump is powered from VDD, and generates split rails
CPVOUTP and CPVOUTN. The circuit is adaptive according to the audio signal conditions,
supporting the Class G operation and ensuring optimum circuit configuration at all times. The
switching clock for the charge pump is generated internally.
The external connections for the charge pump are illustrated in Figure 3. A fly-back capacitor is
connected between the CPCA and CPCB pins. De-coupling capacitors are required on CPVOUTP
and CPVOUTN. An input decoupling capacitor may also be required at VDD, depending upon the
system configuration.
Figure 3 External Connections for Charge Pump
PP, January 2010, Rev 1.0
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