AK4628A Datasheet, PDF (39/41 Pages) Asahi Kasei Microsystems – High Performance Multi-channel Audio CODEC

ASAHI KASEI
[AK4628A]
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.
„ Peripheral I/F Example
The AK4628A 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 AK4628A 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.
3.3V Analog
5V for input
PLL I/F
Audio signal
3.3V Digital
DSP
5V Analog
AK4112B
3.3V for output
5V Digital
Analog Digital
AK4628A
Control signal
uP &
Others
Figure 27. Power supply connection example
MS0385-E-00
- 39 -
2005/02