AK4702EQ Datasheet, PDF (34/39 Pages) Asahi Kasei Microsystems – 2ch DAC with AV SCART switch

ASAHI KASEI
[AK4702EQ]
1. Grounding and Power Supply Decoupling
VD, VP, VVD1, VVD2, VSS and VVSS should be supplied from analog supply unit and be separated from system digital
supply. Decoupling capacitor, especially the 0.1µF ceramic capacitor for high frequency noise should be placed as near to
VD (VP, VVD1, VVD2) as possible.
2. Voltage Reference
Each VCOM is a signal ground of this chip. An electrolytic capacitor 10µF parallel with a 0.1µF ceramic capacitor
attached to VCOM pin eliminates the effects of high frequency noise. No load current may be drawn from VCOM pin. All
signals, especially clocks, should be kept away from VCOM pins in order to avoid unwanted coupling into the AK4702.
3. Analog Audio Outputs
The analog outputs are also single-ended and centered on 5.6V(Typ.). The output signal range is typically 2Vrms
(typ@VD=5V). The internal switched-capacitor filter and continuous-time filter attenuate the noise generated by the
delta-sigma modulator beyond the audio pass band. Therefore, any external filters are not required for typical application.
The output voltage is a positive full scale for 7FFFFFH (@18bit) and a negative full scale for 800000H (@18bit). The
ideal output is 5.6V(Typ.) for 000000H (@18bit). The DC voltage on analog outputs are eliminated by AC coupling.
MS0424-E-00
- 34 -
2005/09