AK4950 Datasheet, PDF (67/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

[AK4950]
AK4950
75Ω
VOUT
75Ω
0V
Figure 50. Video Signal Output
■ Regulator Block
The AK4950 integrates two regulators. The 3.3V (typ) power supply voltage from the AVDD pin is converted to 2.3V
(typ) by the regulator 1 and supplied to the analog logic (MIC-Amp, ADC, DAC, MIN, Video-Amp input stage, LPF of
video block and charge pump). It is also converted to 1.8V (typ) by the regulator 2 and supplied to the digital logic (digital
core block). Each regulator is powered up by the PDN pin = “H”, and powered down by the PDN pin = “L”. Connect a
2.2µF (± 50%) capacitor to the REGFIL1 pin and a 1.0µF (± 50%) capacitor to the REGFIL2 pin to reduce noise on
AVDD.
AK4950
AVDD
Power-up when PDN pin =“H”
Power-down when PDN pin =“L”
Regulator1
typ 2.3V
Regulator2
typ 1.8V
To Analog Block
To Digital Block
REGFIL1
2.2μF ± 50%
REGFIL2
1.0μF ± 50%
Figure 51 Regulator Block
MS1320-E-00
- 67 -
2011/10