AK4538 Datasheet, PDF (35/70 Pages) Asahi Kasei Microsystems – 16Bit DS CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
(2) Using BEEPL and BEEPR pins
AK4538
20k
± 30%
[AK4538]
45%AVDD
20k
± 30%
BPSSP
SPK-Amp
SPP
SPN
MOUT2
0.1u
15k
BEEPL
45%AVDD
BEEPR
BPSSP
15k
Figure 30. Connection example for 300mW output using BEEPL and BEEPR pins
Note)
1. MOUT2 output is recommended to be AC coupled to avoid amplified DC offset of common voltage of MOUT2 and
BEEP-Amp is output via BTL Speaker-Amp (that means stand-by current is increased). Capacitor size affects the
cut-off frequency of 1^st order LPF made by this AC coupling capacitor and series resister in front of BEEP input.
2. BEEP input path has 1.9dB greater gain than MIN input since ALC2 circuit is not included in BEEP path.
3. Internal feedback resister of BEEP-Amp which determines BEEP-Amp gain has 30% sample variation.
n MONO OUTPUT (MOUT2 pin)
The mixed Lch/Rch signal of DAC is output from the MOUT2 pin. When the MOUT2 bit is “0”, this output is OFF and the
MOUT2 pin is forced to VCOM voltage. The load impedance is 10kΩ (min.). When the PMSPK bit is “0”, the
Speaker-amp enters power-down-mode and the output is placed in a Hi-Z state.
MS0198-E-01
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2003/5