AK4340_10 Datasheet, PDF (21/24 Pages) Asahi Kasei Microsystems – 192kHz 24-Bit Stereo ΔΣ DAC with 2Vrms Output

[AK4340]
1. Grounding and Power Supply Decoupling
VDD, HVEE 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 HVEE as possible.
The differential Voltage between VDD and VSS pins set the analog output range.
Power-up sequence between VDD and HVEE is not critical.
2. Analog Outputs
The analog outputs are single-ended and centered around the ground (VSS). The output signal range is typically 2Vrms
(@VDD=5V & GAIN pin = “L”). The phase of the analog outputs can be inverted channel independently by INVL/INVR
bits. The internal switched capacitor filter (SCF) and continuous time filter (CTF) attenuate the noise generated by the
delta-sigma modulator beyond the audio passband. If the noise generated by the delta-sigma modulator beyond the audio
band would be the problem, the 1^st order filter is required. (See Figure 16)
The output voltage is a positive full scale for 7FFFFFH (@24bit) and a negative full scale for 800000H (@24bit). The
ideal output is 0V(VSS) for 000000H (@24bit).
AOUT
470
2.2n
Analog
Out
Figure 16. External 1^st order LPF Circuit Example
(fc = 154kHz, gain = -0.28dB @ 40kHz, gain = -1.04dB @ 80kHz)
MS0501-E-01
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2010/09