ak4628 AKM Semiconductor, Inc., ak4628 Datasheet - Page 39

• Manufacturer Part Number: ak4628
• Description: High Performance Multi Channel Audio Codec
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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.
T Peripheral I/F Example
The AK4628 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 AK4628 should be 3.3V when the peripheral devices operate at a nominal 3.3V supply.
Figure 27 shows an example with the mixed system of 3.3V and 5V.
MS0211-E-02
3.3V Analog
5V Analog
Figure 27. Power supply connection example
Analog Digital
PLL
AK4628
AK4112B
3.3V for output
5V for input
I/F
Audio signal
Control signal
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uP &
Others
DSP
3.3V Digital
5V Digital
[AK4628]
2004/03