ak4538 AKM Semiconductor, Inc., ak4538 Datasheet - Page 60

• Manufacturer Part Number: ak4538
• Description: 16bit ?? Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
n Clock Set up
When ADC, DAC, ALC1 and ALC2 are used, the clocks (MCLK, BICK and LRCK) must be supplied.
MS0198-E-01
(Addr:04H, D5-4)
BICK, LRCK
1. When X'tal is used in PLL mode. (Slave mode)
<Example>
(Addr:01H, D7)
(Addr:01H, D6)
(Addr:01H, D5)
(Addr:04H, D3)
MCKPD bit
PS1-0 bits
PMXTL bit
PMPLL bit
MCKO pin
MCKO bit
(Slave Mode)
(1) Release the pull-down of the XTI pin : MCKPD bit = “1”
(2) Power-up the PLL : PMPLL bit = “0”
(3) Enable MCKO output : MCKO bit = “0”
(4) MCKO is output after PLL becomes stable.
(5) Input BICK and LRCK synchronized with the MCKO output.
(6) Set the MCKO output frequency (PS1-0 bits)
“0”
The PLL should be powered-up after the X’tal oscillator becomes stable. If X'tal and PLL are powered-up at the
same time, the PLL does not start. It takes X’tal oscillator 20ms(typ) to be stable after PMXTL bit= “1”. This
time depends on X’tal. PLL needs 40ms lock time the PMPLL bit = “0”
If PS1-0 bits are changed before LRCK is input, MCKO is not output. PS1-0 bits should be changed after
LRCK is input.
“1”
(1)
20ms(typ)
(2)
(3)
00
40ms(max)
Figure 48. Clock Set Up Sequence(1)
“1”
“1”
(4)
(5)
- 60 -
Output
(6)
Input
XX
“0” and power-up the X’tal oscillator: PMXTL bit =
E x a m p l e :
A u d io I/F F o r m a t : I
B I C K f r e q u e n c y a t M a s t e r M o d e : 6 4 f s
I n p u t M a s t e r C lo c k S e le c t a t P L L M o d e : 1 1 .2 8 9 6 M H z
O utp u t M a s t e r C lo c k F re q ue n c y : 6 4 f s
(5 ) B I C K a n d L R C K i n p u t s t a r t
(1 ) A d d r : 0 1 H , D a t a : 4 0 H
(2 ) A d d r : 0 1 H , D a t a : 6 0 H
(3 ) A d d r : 0 4 H , D a t a 4 A H
(4 ) M C K O o u t p u t s t a r t s
(6 ) A d d r : 0 4 H , D a t a 6 A H
“1”.
2
S
[AK4538]
2003/5