ak4121 AKM Semiconductor, Inc., ak4121 Datasheet - Page 12

• Manufacturer Part Number: ak4121
• Description: Asynchronous Sample Rate Converter
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
T System Reset
Bringing the PDN=“L” places the AK4121 in power-down mode and initializes the digital filter. The AK4121 should
be reset once by bringing PDN=“L” upon power-up. Regarding the SDTO valid time, please refer following table. Until
then, the SDTO outputs “L”.
MS0191-E-03
Case 1
Case 2
External clocks
(internal state)
External clocks
(internal state)
External clocks
External clocks
SDTI
SDTI
SDTO
SDTO
PDN
PDN
(input port)
(input port)
(output port)
(output port)
Power-down
Power-down
don’t care
don’t care
don’t care
Note: <100ms for recommended value 2, <200ms for recommended value 1. (ref. Figure 7)
“0” data
“0” data
(no clock)
Table 5. Reset time t
PLL lock &
(don’t care)
(don’t care)
fs detection
Reset time
(note)
10ms<
10ms
t
a
(state1)
(state1)
(state1)
Figure 5. System Reset
normal data
PLL
Unlock
normal
operation
- 12 -
a
and Data valid time t
Data valid time
PD
<100ms
<200ms
“0” data
PLL lock &
PLL lock &
fs detection
fs detection
t
b
(state2)
(state1)
(state2)
(state2)
(state1)
(state1)
(note)
t
b
t
a
b.
normal data
normal data
normal
normal
operation
operation
Power-down
Power-down
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
“0” data
“0” data
[AK4121]
2004/08