ASAHI KASEI
[AK4528]
4.7k
4.7k
R1
AOUT-
470p
+Vop
3300p
4.7k
Analog
Out
R1
-
+
AOUT+
4.7k
470p
-Vop
When R1=200ohm
fc=93.2kHz, Q=0.712, g=-0.1dB at 40kHz
When R1=180ohm
fc=98.2kHz, Q=0.681, g=-0.2dB at 40kHz
Figure 13. External 2nd order LPF Example (using dual supply op-amp)
180p
4.7k
4.7k
4.7k
AOUT-
AOUT+
+Vop
Analog
Out
-
+
4.7k
180p
-Vop
fc=188kHz
Figure 14. External low cost 1st order LPF Example (using dual supply op-amp)
n Peripheral I/F Example
The digital inputs of the AK4528 are TTL inputs and can accept the signal of device with a nominal 3V supply. The digital
output can interface with the peripheral device with a nominal 3V supply when the VT supply operates at a nominal 3V
supply.
5V Analog
3V Digital
Audio signal
DSP
Analog
Digital
I/F
3 or 5V Digital
AK4528
uP &
Others
Control signal
Figure 16. Power supply connection example
MS0011-E-00
2000/1
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AKM [ ASAHI KASEI MICROSYSTEMS ]
