AK4534 Datasheet, PDF (52/64 Pages) Asahi Kasei Microsystems – 16Bit CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4534]
1. Grounding and Power Supply Decoupling
The AK4534 requires careful attention to power supply and grounding arrangements. AVDD, DVDD, PVDD and HVDD
are usually supplied from the system’s analog supply. If AVDD, DVDD, PVDD and HVDD are supplied separately, the
correct power up sequence should be observed. AVSS, DVSS, PVSS and HVSS of the AK4534 should be connected to the
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 AK4534 as possible, with the small
value ceramic capacitor being the nearest.
2. Voltage Reference
VCOM is a signal ground of this chip. A 2.2µF electrolytic capacitor in parallel with a 0.1µF ceramic capacitor attached to
the VCOM pin eliminates the effects of high frequency noise. No load current may be drawn from the VCOM pin. All
signals, especially clocks, should be kept away from the VREF and VCOM pins in order to avoid unwanted coupling into
the AK4534.
3. Analog Inputs
The Mic and Beep inputs are single-ended. The input signal range scales with nominally at 0.06 x AVDD Vpp for the Mic
input and 0.6 x AVDD Vpp for the Beep input, centered around the internal common voltage (0.45 x AVDD). Usually the
input signal is AC coupled using a capacitor. The cut-off frequency is fc = (1/2πRC). The AK4534 can accept input
voltages from AVSS to AVDD.
4. Analog Outputs
The input data format for the DAC is 2’s complement. The output voltage is a positive full scale for 7FFFH(@16bit) and
a negative full scale for 8000H(@16bit). Mono output from the MOUT2 pin and Mono Line Output from the MOUT+ and
MOUT- pins are centered at 0.45 x AVDD. The Headphone-Amp and Speaker-Amp outputs are centered at HVDD/2.
MS0133-E-03
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2003/5