AK4627 Datasheet, PDF (42/46 Pages) Asahi Kasei Microsystems – High Performance Multi-channel Audio CODEC

[AK4627]
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.
5. External Analog Inputs Circuit
Figure 33 shows the input buffer circuit example 3. The input level of this circuit is ±3.4Vpp.
Analog In
3.4Vpp
Analog In
3.4Vpp
2.2uF+- 50%
2.2uF +- 50%
AIN+
AK4627
AIN-
Figure 33. Input buffer circuit example 1 (AC coupled differential input)
Figure 34 shows the input buffer circuit example 3. The input level of this circuit is 3.4Vpp.
Analog In
3.4Vpp
2.2uF+- 50%
Open
AIN+
AK4627
AIN-
Figure 34. Input buffer circuit example 2 (AC coupled single-ended input)
MS1278-E-02
- 42 -
2012/03