AK4341 Datasheet, PDF (15/18 Pages) Asahi Kasei Microsystems – 192kHz 24-Bit Stereo ΔΣ DAC with 2Vrms Output

ASAHI KASEI
[AK4341]
1. Grounding and Power Supply Decoupling
VDD, HVDD and VSS are supplied from analog supply and should be separated from system digital supply. Decoupling
capacitor, especially 0.1μF ceramic capacitor for high frequency should be placed as near to VDD and HVDD as possible.
The differential voltage between VDD and VSS pins set the analog output range. The power-up sequence between
VDD and HVDD is not critical.
2. Analog Outputs
The analog outputs are single-ended and centered around the VDD voltage. The output signal range is typically 2Vrms
(typ @VDD=3.3V). The internal switched-capacitor filter and continuous-time filter attenuate the noise generated by the
delta-sigma modulator beyond the audio passband. The output voltage is a positive full scale for 7FFFFFH (@24bit) and
a negative full scale for 800000H (@24bit). The ideal output is VDD voltage for 000000H (@24bit).
DC offsets on analog outputs are eliminated by AC coupling since analog outputs have DC offsets of VDD + a few mV.
Figure 7 shows an example of the external LPF with 2Vrms (typ) output.
AK4341
AOUT
10u
470
22k
2.2nF
Analog
Out
2Vrms (typ)
(fc = 154kHz, gain = -0.28dB @ 40kHz, gain = -1.04dB @ 80kHz)
Figure 7. External 1^st order LPF Circuit Example
MS0558-E-01
- 15 -
2007/03