Le58083
Data Sheet
Master Clock
(See Figure 16 for the Master Clock timing diagram.)
No.
37
38
39
40
41
Symbol
JMCY
Parameter
Master clock jitter
Min
Typ
Max
50
Unit
Notes
6
tMCR
tMCF
tMCH
tMCL
Rise time of clock
15
Fall time of clock
15
ns
MCLK HIGH pulse width
MCLK LOW pulse width
48
48
Auxiliary Output Clocks
No.
Symbol
Parameter
Min
Typ
Max
Unit
Chopper clock frequencyCHP = 0
256
fCHP
42
kHz
7
CHP = 1
292.57
DCCHP
fE1
tE1
42A
43
44
Chopper clock duty cycle
E1 output frequency (CMODE = EE1 = 1)
E1 pulse width (CMODE = EE1 = 1)
50
4.923
31.25
%
kHz
µs
7
7
7
Notes:
1. If CFAIL = 1 (Command 55h), GX, GR, Z, B1, X, R, and B2 coefficients must not be written or read without first deactivating all channels or
switching them to default coefficients; otherwise, a chip select off time of 25 µs is required.
2. The first data bit is enabled on the falling edge of CS or on the falling edge of DCLK, whichever occurs last.
3. The PCM clock frequency must be an integer multiple of the frame sync frequency. The maximum allowable PCM clock frequency is 8.192
MHz. The actual PCM clock rate is dependent on the number of channels allocated within a frame. The minimum clock frequency is 128
kHz in Companded state and 256 kHz in Linear state, PCM Signaling state, or double PCLK state. The minimum PCM clock rates should
be doubled for parts with only one PCM highway in order to allow simultaneous access to all four channels.
4. TSC is delayed from FS by a typical value of N• tPCY, where N is the value stored in the time/clock-slot register.
5. tTSO is defined as the time at which the output achieves the Open Circuit state.
6. PCLK and MCLK are required to be integer multiples of the frame sync (FS) frequency. Frame sync is expected to be an accurate 8 kHz
pulse train. If PCLK or MCLK has jitter, care must be taken to ensure that all setup, hold, and pulse width requirements are met.
7. Phase jumps of 81 ns will be present when the master clock frequency is a multiple of 1.544 MHz.
22
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
