AK2540 Datasheet, PDF (13/33 Pages) Asahi Kasei Microsystems – Quad T1 Transceiver

ASAHI KASEI
[AK2540]
AC CHARACTERISTICS(Clock/Data)
Parameter
Clock Frequency
Clock Pulse Width
Clock Pulse Width
Clock Pulse Width
Duty Cycle
Setup/Hold Time
Setup/Hold Time
Rise Time
MCLK1
MCLK2
MCLK1
MCLK2
Symbol
fci1
fci2
tpwhi
tpwli
TCLK
RCLK
RCLK
TCLK
RCLK
RPOS
RNEG
TCLK
TPOS
TNEG
RCLK, TCLK
RPOS, TOPS
RNEG, TNEG
tpwhi
tpwli
tpwho
tpwlo
tsu1
th1
tsu2
th2
tr
Min
1.543846
24.70153
150
50
Typ
1. 544000
24.70400
324
20
324
324
50
Max
1.544154
24.70647
50
Units Conditions
MHz ±100ppm
Note 1
ns RefertoFig.4
1.544MHz
ns RefertoFig.4
24.704MHz
ns RefertoFig.2
ns RefertoFig.1
Note 3
% Note2
Note 3
ns RefertoFig.1
ns RefertoFig.2
ns RefertoFig.3
Note3
Fall Time
RCLK, TCLK
tf
RPOS, TPOS
RNEG, TNEG
50
ns RefertoFig.3
Note3
Note 1:
Note 2:
Note 3:
All AK2540 specifications are to be within the limit with ±100ppm MCLK.
However, MCLK needs to be within ±32ppm range in order to transmit AIS of ±32 ppm
accuracy during the loss of TCLK.
Duty Cycle:(tpwho/( tpwho + tpwlo)) × 100%
Drive 15pF Load Capacitance
MS0012-E-00
13
2000/1