AK4710 Datasheet, PDF (16/31 Pages) Asahi Kasei Microsystems – Low Power Single SCART Driver

[AK4710]
■ Analog output block
The AK4710 has a charge pump circuit generating negative power supply rail from a 3.3V(typ) power supply. (Figure 5)
It allows the AK4710 to output audio signal centered at VSS (0V, typ) as shown in Figure 6. The negative power
generating circuit (Figure 5) needs 1.0uF capacitors (Ca, Cb) with low ESR (Equivalent Series Resistance). When using
capacitors with a polarity, the positive side should be connected to CP and VSS2 for capacitor Ca and Cb, respectively.
When the MUTE bit = “1”, the charge pump circuit is in power down mode and its analog outputs become VSS (0V, typ).
AK4710
VD
Charge
Pump
Negative Power
CP
CN VSS2
VEE
Cb
(+)
1 uF
1uF Ca
(+)
Figure 5. Negative Power Generate Circuit
AK4710
0V
TVOUTR/TVOUTL
2Vrms
Figure 6. Audio Signal Output
Rev. 0.3
- 16 -
2011/07