ASAHI KASEI
[AK4527B]
4. Analog Outputs
The analog outputs are also single-ended and centered around the VCOM voltage. The input signal range scales with the
supply voltage and nominally 0.6 x VREFH Vpp. The DAC input data format is 2’s complement. The output voltage is a
positive full scale for 7FFFFFH(@24bit) and a negative full scale for 800000H(@24bit). The ideal output is VCOM
voltage for 000000H(@24bit). The internal analog filters remove most of the noise generated by the delta-sigma
modulator of DAC beyond the audio passband.
DC offsets on analog outputs are eliminated by AC coupling since DAC outputs have DC offsets of a few mV.
n Peripheral I/F Example
The AK4527B can accept the signal of device with a nominal 3.3V supply because of TTL input. The power supply for
output buffer (TVDD) of the AK4527B should be 3.3V when the peripheral devices operate at a nominal 3.3V supply.
Figure 16 shows an example with the mixed system of 3.3V and 5V.
5V for input
3.3V Analog
3.3V Digital
Audio signal
PLL
I/F
DSP
AK4112A
3.3V for output
5V Analog
5V Digital
uP &
Others
Analog Digital
Control signal
AK4527B
Figure 16. Power supply connection example
MS0056-E-00
2000/10
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AKM [ ASAHI KASEI MICROSYSTEMS ]
