AK2574VB AKM [Asahi Kasei Microsystems], AK2574VB Datasheet - Page 16

• Manufacturer Part Number: AK2574VB
• Description: 156M Laser Diode Driver + APC for Burst Mode
• Manufacturer: AKM [Asahi Kasei Microsystems]

transition. To protect the last DATA, BRST 1→ 0 transition should be behind the last DATA input. Fig 2-6 illustrates
the timing example.
sensor (every 6℃, Duty data is stored in E_DUTY_TC, see Table 6-3 for more information). Write same data into
E_DUTY_TC for constant duty adjustment. Table 2 -3 and 2-4 show the characteristics of duty adjustment function.
Fig 2-5 Input timing example with CLK
AK2574 operates without CLK when SEL=”L”. DATA input should be 12.8ns or more behind BRST = 0 → 1
Fig 2-6 Input timing example without CLK
AK2574 supplies a programmed duty adjustment in response to the temperature from an on-chip temperature
2.2.3
2.3 Duty Adjustment
Table 2-3 Duty Adjustment characteristics
Note 1: This parameter is characterized and is not 100% tested.
Table 2-4 Pulse Extended
<MS0266-E-00>
BRSTP - BRSTN
DATAP - DATAN
Item
Maximum Pulse Extended
1 LSB Pulse Extended Step
Pulse Extended Stability
DATAP - DATAN
BRSTP - BRSTN
CLKP- CLKN
R_DUTY
Input Timing (SEL=”L”, in the case of direct DATA)
30
31
0
1
2
.
.
Pulse Extended (typ) [ns]
12.8ns (min)
2 CLK (typ)
Symbol
Tstep
Tsta
0.03
0.06
0.90
0.93
Td
0
.
.
min
0.5
(24bit included Guard Time)
(24bit include Guard Time)
Preamble + Delimiter
Preamble + Delimiter
Remark
0.03
typ
-16-
max
0.2
Unit
ns
ns
ns
Note 1
32 Steps
Ta=-40 to 85℃, VDDDR=3.1～3.5V
0.3ns Extended (Note 1)
ATM Cell (53byte)
ATM Cell (53byte)
Remarks
2003/12