AK4635 Datasheet, PDF (53/81 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4635]
■ Speaker Output
AK4635 has a Mono Class-D Speaker-Amp. Power supply for Speaker-Amp(SVDD) can be set from 2.2V up to 4.0V.
The Speaker is mono and BTL output, and can drive dynamic speaker and piezo speaker without LPF (filter-less). This
speaker can output 400W@8Ω at SVDD = 3.3V, SPKG bit = “0”. This gain is set by SPKG bit (Table 37). The output
level of speaker amp is depended on voltage of SVDD and SPKG bit.
SPKG bit
Gain
0
0dB
1
+2dB (Note 39)
Note 39. The signals more than -2dBFS clip.
Table 37. SPK- Amp Gain
The power up/down speaker amp is controlled by PMSPK bit. When PMSPK bit is “0”, the SPP and SPN pins output
VSS3 level. Also ON/OFF of speaker amp is controlled by SPOUTE bit. When SPOUTE bit is “0”, the SPP and SPN pins
are in VSS3-state forcibly. When the outputting from DAC to speaker, PMDAC bit should be set to “1”.
Follow the following sequence.
P M S P K b it
S P O U T E b it
S P P p in
S P N pin
N orm al O utput
N orm al O utput
Figure 47. Power-up/Power-down Timing for Speaker-Amp
Rev. 0.6
- 53 -
2007/10