AK4636 Datasheet, PDF (89/105 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4636]
PLL3 PLL2 PLL1 PLL0 PLL Reference
Input
Mode
bit bit bit bit Clock Input Pin Frequency
R and C of
VCOC pin
(Note 32)
R[Ω] C[F]
PLL Lock
Time
(max)
0
0
0
0
0
FCK pin
1fs
6.8k 220n 160ms
1
0
0
0
1
BICK pin
16fs
10k 4.7n
2ms
2
0
0
1
0
BICK pin
32fs
10k 4.7n
2ms
3
0
0
1
1
BICK pin
64fs
10k 4.7n
2ms
4
0
1
0
0
MCKI pin 11.2896MHz 10k 4.7n
10ms
6
0
1
1
0
MCKI pin
12MHz
10k 4.7n
10ms
7
0
1
1
1
MCKI pin
24MHz
10k 4.7n
10ms
12
1
1
0
0
MCKI pin
13.5MHz 10k 10n
10ms
13
1
1
0
1
MCKI pin
27MHz
10k 10n
10ms
Others
Others
N/A
Note 32. The tolerance of R is ±5%, the tolerance of C is ±30%
Table 4. Setting of PLL Mode (*fs: Sampling Frequency, N/A: Not available)
(default)
1. Grounding and Power Supply Decoupling
The AK4636 requires careful attention to power supply and grounding arrangements. AVDD, DVDD, SVDD and VVDD
are usually supplied from the system’s analog supply. If AVDD, DVDD, SVDD and VVDD are supplied separately, the
power up sequence is not critical but the PDN pin must be put “L” after all powers are supplied. VSS1, VSS2 and VSS3
of the AK4636 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 AK4636 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 VCOM pin in order to avoid unwanted coupling into the
AK4636.
3. Analog Inputs
The Microphone input supports both single-ended and differential inputs. The input signal range is 1.5Vpp
(typ)@MGAIN = 0dB or 0.15Vpp (typ)@MGAIN = +20dB entered around the internal common voltage 1.15V (typ).
Usually the input signal is AC coupled with a capacitor. The cut-off frequency is fc =1/ (2πRC). The AK4636 can accept
input voltages from VSS 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). The ideal output is VCOM voltage for 0000H (@16bit). Mono Line Output from
the AOUT pin is 1.5Vpp (typ)@LOVL bit = “0” centered around common voltage 1.15V (typ).
5. Video Inputs
Video inputs are AC coupled with a 0.1uF capacitor. This AC coupling capacitor must be 0.1uF (in ±30% tolerance).
Attention should be given to avoid coupling with other analog and digital signals.
6. Video Outputs
The AK4636 integrates 2ch video amp for driving 150Ω resistance. The gain of each amp is +6dB@GCA=0dB (typ)
MS1012-E-01
- 89 -
2010/08