WM8962 Datasheet, PDF (282/295 Pages) Wolfson Microelectronics plc – Ultra-Low Power Stereo CODEC with Audio Enhancement DSP, 1W Stereo Class D Speaker Drivers and Ground Referenced Headphone Drivers

WM8962
CHARGE PUMP COMPONENTS
The WM8962 incorporates a Charge Pump circuit, which generates the CPVOUTP and CPVOUTN
supply rails for the ground-referenced headphone drivers.
Decoupling capacitors are required on each of the Charge Pump outputs. A fly-back capacitor is also
required. The recommended Charge Pump capacitors for WM8962 are detailed below in Table 134.
DESCRIPTION
CPVOUTP decoupling
CPVOUTN decoupling
Charge Pump fly-back
(connect between C1CA and C1CB)
Table 134 Charge Pump External Capacitors
CAPACITOR
Required capacitance is 2.0F at 2V.
Suitable component typically 4.7F.
Required capacitance is 2.0F at 2V.
Suitable component typically 4.7F.
Required capacitance is 1.0F at 2V.
Suitable component typically 2.2F.
Ceramic capacitors are recommended for these Charge Pump requirements. Note that, due to the
wide tolerance of many types of ceramic capacitors, care must be taken to ensure that the selected
components provide the required capacitance across the required temperature and voltage ranges in
the intended application. Ceramic capacitors with X5R dielectric are recommended.
The positioning of the Charge Pump capacitors is important, particularly the fly-back capacitors.
These capacitors should be placed as close as possible to the WM8962.
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Rev 4.3