AK4537 Datasheet, PDF (35/76 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
2) Using BEEPL and BEEPR pins
AK4537
20k
± 30%
[AK4537]
45%AVDD
20k
± 30%
BPSSP
SPK-Amp
SPP
SPN
MOUT2
0.068u _20k
BEEPL
45%AVDD
BEEPR
BPSSP
20k
Figure 30. Connection example for 400mW output using BEEPL and BEEPR pins (SPKG bit = “1”)
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. Internal feedback resister of BEEP-Amp which determines BEEP-Amp gain has 30% sample variation.
„ 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.
MS0202-E-04
- 35 -
2005/04