ak5386 AKM Semiconductor, Inc., ak5386 Datasheet - Page 16

• Manufacturer Part Number: ak5386
• Description: Single-ended 24-bit 192khz ?? Adc
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
[AK5386]
1. Grounding and Power Supply Decoupling
The AK5386 requires careful attention to power supply and grounding arrangements. To minimize coupling from digital
noise, decoupling capacitors should be connected to VA and VD respectively. VA is supplied from the analog supply in
the system, and VD is supplied from the digital supply in the system. The power up sequence is not critical between VA
and VD. AGND and DGND of the AK5386 must be connected to one analog ground plane. System analog
ground and digital ground should be connected together near to where the supplies are brought onto the printed circuit
board. Decoupling capacitors should be as near to the AK5386 as possible, with the small value ceramic capacitor being
the nearest.
2. Voltage Reference
The voltage input to VA sets the analog input range. VCOM are 50%VA and normally connected to AGND with a 0.1µF
ceramic capacitor. A capacitor 2.2µF attached to VCOM pin eliminates the effects of high frequency noise. No load
current may be drawn from these pins. All signals, especially clocks, should be kept away from the VA and VCOM pins
in order to avoid unwanted coupling into the AK5386.
3. Analog Inputs
The ADC inputs are single-ended and internally biased to the common voltage (50%VA) with 6kΩ (typ, @fs=48kHz,
96kHz, 192kHz) resistance. The input signal range scales with the supply voltage and nominally 0.6xVA Vpp (typ). The
ADC output data format is 2’s complement. The internal HPF removes the DC offset.
The AK5386 samples the analog inputs at 128fs (@ fs=48kHz), 64fs (@ fs=96kHz) or 32fs(@ fs=192kHz). The digital
filter rejects noise above the stop band except for multiples of 64fs or 32fs. The AK5386 includes an anti-aliasing filter
(RC filter) to attenuate a noise around 128fs, 64fs or 32fs.
MS0579-E-00
2006/12
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