ak4640 ETC-unknow, ak4640 Datasheet - Page 35

• Manufacturer Part Number: ak4640
• Description: 16bit Codec With /hp/spk-ampl
• Manufacturer: ETC-unknow

ASAHI KASEI
When the PMBPS bit is set to “1”, the stereo beep input is powered up. And when the BPSHP bit is set to “1”, the input
signals from the BEEPL and BEEPR pins are mixed to Headphone-amp. When the BPSSP bit is set to “1”, the input
signals from the BEEPL and BEEPR pins are mixed to Speaker-amp. When the PMBPM bit is set to “1”, mono beep input
is powered up. And when the BPMHP bit is set to “1”, the input signal from the BEEPM pin is mixed to Headphone-amp.
When the BPMSP bit is set to “1”, the input signal from the BEEPM pin is mixed to Speaker-amp. The external resisters
Ri adjust the signal level of each BEEP input that is mixed to Headphone and Speaker outputs. When BPMSP bit is “1”,
the offset voltage between SPP and SPN pins may be large. Therefore, it is recommended that BPMSP bit be set to “0”
while the beep signal is not output.
MS0273-E-00
BEEP Input
BEEPL
BEEPL
BEEPM
BEEPM
BEEPM
BEEPR
BEEPL
Ri
Ri
Ri
HPL; BEEPR
SPP/N; BEEPR
HPL; BEEPM
SPP/N
Path
20k(typ)
20k(typ)
2k(typ)
Figure 24. Block Diagram of BEEP pins
HPR
Table 20. BEEP input gain
HPR
SPP/N
AK4640
- 35 -
(16.7k / Ri) ± 50%
(26.7k / Ri) ± 50%
(1.67k / Ri) ± 50%
(44.7k / Ri) ± 50%
Gain
+27.0dB
+2.5dB
+2.5dB
-1.6dB
-1.6dB
-1.6dB
Example (Ri=20k)
−21.6dB ± 6dB
−1.6dB ± 6dB
+2.5dB ± 6dB
+7.0dB ± 6dB
BPMHP
BPMSP
BPSHP
BPSHP
BPSSP
HPR
HPL
SPK
MIX
MIX
MIX
[AK4640]
2004/03