參數(shù)資料
型號(hào)： AK2574VB
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 156M Laser Diode Driver + APC for Burst Mode
中文描述： 1.56激光二極管驅(qū)動(dòng)器apc的突發(fā)模式
文件頁(yè)數(shù)： 14/30頁(yè)
文件大?。?/td> 248K
代理商： AK2574VB
ASAHI KASEI
[AK2574]
<MS0266-E-00>
-14-
2003/12
2. LD Driver
Fig 2-1 illustrates the block diagram of LD driver function.
The AK2574 LD driver contains a Driver part, an APC part, a LVPECL I/F part and a programmable duty
adjustment.
The driver part is composed of 156M MOD current switching controlled by DATA, and BIAS current switching
controlled by BRST.
APC part is composed of a programmable BIAS and MOD currents in response to the temperature (APC_FF), an
on-chip temperature sensor, and 2 current DACS (I-DAC1 and I-DAC2).
The LVPECL I/F part is composed of LVPECL I/F for data, clock and the burst control signal (BRST).
Fig 2-1 Driver Block Diagram
IBIAS
CLK
(LVPECL)
DATA
(LVPECL)
LD
Imod
DATAP
DATAN
CLKP
CLKN
IMODN
IMOD
BRST
(LVPECL)
BRSTP
BRSTN
CLKALM
FF
FF
AND
DUTY_
ADJ
Ibias
data
data_ff
clk
brst
brst_ff
IBIASC1
IBIASC2
0.1uF
0.1uF
SEL
SEL
330
Ω
IBIASR1
I-DAC1
I-DAC2
EEPEOM
TEMP_SENS
R_DAC1
R_DAC2
R_TEMP
Driver
LVPECL I/F
APC
ADC
vtemp
2.1 Driver
The 156M MOD driver is composed of the differential current switches, and it sinks the MOD current from IMOD pin
when DATA (DATAP – DATAN) = 1 and sinks the current from IMODN when DATA = 0. DATA is set “0” when
BRST (BRSTP – BRSTN) = 0.
The BIAS driver is composed of the single-end current switch, and it sinks the BIAS current from IBIAS when
BRTS=1. To protect the last LD current at BRST 1
→
0, BIAS current turned off timing is delayed for a duty extended
when the last DATA=1.
2.2 LVPECL I/F (DATAP, DATAN, CLKP, CLKN, BRSTP, BRTSN)
The AK2574 supports direct data or latched data input (see Table 2-1). Connect CLKP = VDD or leave open and
CLKN = VSS when SEL = “L”.
Table 2-1 Data input
SEL (CMOS)
“L”
“H”
Direct data
Latched data with clock
2.2.1
Table 2-2 shows LVPECL input characteristics. The AK2574 LVPECL input, which is biased to0.6 * VDD with 10k
Ω
or more impedance respectively.
LVPECL Input Characteristics
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