AK4633EN Datasheet, PDF (65/83 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

[AK4633]
1. Grounding and Power Supply Decoupling
The AK4633 requires careful attention to power supply and grounding arrangements. AVDD, DVDD and SVDD are
usually supplied from the system’s analog supply. If AVDD, DVDD and SVDD are supplied separately, the correct power
up sequence should be observed. AVSS, DVSS and SVSS of the AK4633 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 AK4633 as possible, with the small value ceramic
capacitor being the nearest.
2. Voltage Reference
VCOM is a signal ground of this chip. A 2.2F electrolytic capacitor in parallel with a 0.1F 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 VCOM pin in order to avoid unwanted coupling into the AK4633.
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 (approx. 0.45 x AVDD).
Usually the input signal is AC coupled using a capacitor. The cut-off frequency is fc = 1/(2RC). The AK4633 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 MOUT pin and Mono Line Output from the AOUT pin are
centered at 0.45 x AVDD (typ). The Speaker-Amp output is centered at SVDD/2.
MS0447-E-06
- 65 -
2015/10