參數(shù)資料
型號: AK4340_06
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 192kHz 24-Bit Stereo ツヒ DAC with 2Vrms Output
中文描述: 192kHz的24位立體聲ツヒDAC,具有2Vrms的輸出
文件頁數(shù): 21/23頁
文件大?。?/td> 259K
代理商: AK4340_06
ASAHI KASEI
[AK4340]
MS0501-E-00
2006/04
- 21 -
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 0.1
μ
F 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 17)
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).
470
2.2n
AOUT
Analog
Out
Figure 17. External 1
st
order LPF Circuit Example
(fc = 154kHz, gain = -0.28dB @ 40kHz, gain = -1.04dB @ 80kHz)
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