AK4635 AKM [Asahi Kasei Microsystems], AK4635 Datasheet - Page 54
AK4635
Manufacturer Part Number
AK4635
Description
16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP
Manufacturer
AKM [Asahi Kasei Microsystems]
Datasheet
1.AK4635.pdf
(81 pages)
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[AK4635]
<Caution for using Piezo Speaker>
When a piezo speaker is used, resistances more than 10Ω should be connected between the SPP/SPN pins and speaker in
series, respectively, as shown in
Figure
48. Zener diodes should be connected between speaker and GND as shown in
Figure
48, in order to protect SPK-Amp of the AK4635 from the power that is the piezo speaker output when the speaker
is pressured. Zener diodes of the following Zener voltage should be used.
92% of SVDD ≤ Zener voltage of Zener diodo(ZD of
Figure
48) ≤ SVDD+0.3V
Ex) In case of SVDD = 3.8V :3.5V ≤ ZD ≤ 4.1V
For example, Zener diode which Zener voltage is 3.9V(Min 3.7V, Max 4.1V) can be used.
ZD
SPK-Amp
≥10Ω
SPP
SPN
≥10Ω
ZD
Figure 48. Circuit of Speaker Output (using a piezo speaker)
Rev. 0.6
2007/10
- 54 -
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