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AK4709 Datasheet(PDF) 20 Page - Asahi Kasei Microsystems

Part No. AK4709
Description  Low Power AV SCART Switch
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Maker  AKM [Asahi Kasei Microsystems]
Homepage  http://www.akm.com
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AK4709 Datasheet(HTML) 20 Page - Asahi Kasei Microsystems

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[AK4709]
MS1319-
E-00
2011/07
- 20 -
Analog output block
The AK4709 has chargepump circuit generating negative power supply rail from a 3.3V(typ) power supply. (Figure 7)
It allows the AK4709 to output audio signal centered at VSS (0V, typ) as shown in Figure 8. Negative power generating
circuit (Figure 7) 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).
VD
Charge
Pump
CP
CN
VSS2
VEE
1uF
1uF
Negative Power
AK4709
(+)
Cb
Ca
(+)
Figure 7. Negative power generate circuit
TVOUTR/TVOUTL
AK4709
(VCROUTR/VCROUTL)
0V
2Vrms
Figure 8. Audio signal output


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