AK7846 Datasheet, PDF (12/16 Pages) Asahi Kasei Microsystems – Stereo Audio Class-D Amp with Power Booster for Piezo Speakers

AKEMDAKEMD CONFIDENTIAL
[AK7846]
LEVEL DIAGRAM
The gain of AK7846 are determined by Pre-Amplifier, LPF and Class-D Amp, Total gain will be +21dB while
Pre-Amplifier is default setting (PG=0). LPF gain and Class-D Amp gain are not changeable.
Figure 3 shows level diagram of two example, PG=0dB and PG=+15dB.
INx
[dBV] _{0dBV = 1Vrms}
25
20
15
10
Pre
AMP
-3dB to +15dB
3dB step
LPF
Class-D
AMP
+6dB
+15dB
VCxN
VCxP
1kHz
Class-D AMP maximum output
with 150nF load : 8.0Vrms
Output : 18.0dBV (8.0Vrms)
+15dB
5
0
Input (1) : -3.01dBV (0.70Vrms)
*Pre Gain = 0dB
-5
Input path Limit : -3.01dBV
0dB
+6.02dB
-3.01dBV (0.70Vrms)
3.01dBV (0.70Vrms)
- 10
- 15
Input (2) : -18.01dBV (0.126Vrms)
*Pre Gain = +15dB
- 20
+15dB
*1Vrms=0dBV=2.83Vpp (sin wave)
Figure 3. Level Diagram
Rev.04.9
– 12 –
2008/03