AK4953A Datasheet, PDF (54/96 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

[AK4953A]
■ Charge Pump Circuit
The internal charge pump circuit generates negative voltage (PVEE) from AVDD voltage. The PVEE voltage is used for
the headphone amplifier and the speaker amplifier in low voltage mode (LSV bit = “1”). The charge pump circuit starts
operation when PMHPL or PMHPR bit = “1”, or when LSV bit = PMSPK bit = “1”. PMVCM bit must be set “1” to power
up the charge pump circuit.
The power up time of the charge pump circuit is 11ms (max). The headphone amplifier and speaker amplifier will be
powered up after the charge pump circuit is powered up (when PMHPL or PMHPR bit = “1”, or LSV bit = PMSPK bit =
“1”).
The operating frequency of the charge pump circuit is dependent on the sampling frequency. The operation mode of the
headphone amplifier can be changed by the CPCK bit. (Table 52)
CPCK bit
0
Mode
Low power mode
Power Consumption
(DAC → Headphone out)
10.2mW
S/(N+D)
(0dBFS)
72dB
1
High performance mode
12.1mW
80dB
Table 52. Operation Mode of the Charge Pump (PMHPL or PMHPR bit = “1”)
MS1252-E-00
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2010/10