AK4113_1 Datasheet, PDF (16/49 Pages) Asahi Kasei Microsystems – 192KHZ 24BIT DIR WITH 6:1 SELECTOR

ASAHI KASEI
[AK4113]
„ Clock Operation Mode
The CM0 and CM1 pins (or bits) select the clock source and the data source of SDTO. In Mode 2, the clock source is
switched from PLL to X'tal when PLL goes unlock state. In Mode3, the clock source is fixed to X'tal, but PLL is also
operating and the recovered data such as C bits can be monitored. For Mode2 and 3, it is recommended that the
frequency of X’tal is different from the recovered frequency from PLL.
Mode CM1 CM0 UNLOCK PLL
X'tal Clock source SDTO
0
0
0
-
ON ON (Note)
PLL
RX
Default
1
0
1
-
OFF
ON
X'tal
DAUX
2
1
0
0
ON
ON
1
ON
ON
PLL
RX
X'tal
DAUX
3
1
1
-
ON
ON
X'tal
DAUX
ON: Oscillation (Power-up), OFF: STOP (Power-Down)
Note: When the X’tal is not used as clock comparison for fs detection (i.e. XTL1-0 bit = “11”), the X’tal is OFF.
Table 1. Clock Operation Mode Select
„ Master Clock
The AK4113 has two clock outputs, MCKO1 and MCKO2. MCKO2 has two modes. These modes can be selected by the
XMCK bit.
1) When XMCK bit = “0” and BCU bit = “0”
This mode is compatibile AK4112B and AK4114. These clocks are derived from either the recovered clock or the X'tal
oscillator. The frequencies of the master clock outputs (MCKO1 and MCKO2) are set by OCKS0 and OCKS1 as shown
in Table 2. The 512fs clock will not operate when the sampling frequency is 96kHz or 192kHz. The 256fs clock will not
operate when the sampling frequency is 192kHz.
No. OCKS1
0
0
1
0
2
1
3
1
OCKS0
0
1
0
1
MCKO1 pin MCKO2 pin X’tal
256fs
256fs
256fs
256fs
128fs
256fs
512fs
256fs
512fs
128fs
64fs
128fs
Table 2. Master Clock Output Frequency
fs (max)
108 kHz
108 kHz
54 kHz
216 kHz
Default
2) When XMCK bit “1” and BCU bit = “0”
MCKO2 outputs the input clock of the XTI pin when BCU bit = “0” and XMCK bit = “1”. The settings of CM1-0 and
OCKS1-0 bits are ignored. The output frequency can be set by the DIV bit. MCKO1 outputs a clock that is selected by
the CM1-0 bits and OCKS1-0 bits.
XMCK bit
1
1
DIV bit MCKO2 Clock Source MCKO2 Frequency
0
X’tal
x1
1
X’tal
x 1/2
Table 3. Select output frequency of MCKO2
MS0349-E-02
- 16 -
2005/08