ak2573a AKM Semiconductor, Inc., ak2573a Datasheet - Page 12

• Manufacturer Part Number: ak2573a
• Description: 125m / 156m Laser Diode Driver Apc - Asahi Kasei Microsystems
• Manufacturer: AKM Semiconductor, Inc.

current. Table 1-1 and 1-2 show I-DAC1, I-DAC2 characteristics.
ASAHI KASEI
2. Driver
Fig 2-1 illustrates the block diagram of the driver function.
AK2573A has two current DACs, I-DAC1 and I-DAC2. I-DAC1 is for modulation current and I-DAC2 is for bias
(1) I-DAC1 (Table 2-1)
(2) I-DAC2 (Table 2-2)
(3) I-DAC1 / I-DAC2 Common Characteristics
Resolution: 8bit
DNL: +/- 1 LSB @ code = 20h to FFh
3. DATA / CLK I/F (LVPECL)
The AK2573A supports direct data or latched data input (see Table 3-1). Connect CLKP = VSS, and connect CLKN
= VDD or leave open when SEL = “ L” .
Table 3-1 Data input
<MS0189-E-01>
Fig 2-1 Driver Block Diagram
AK2573A
RE_DAC1_
GAIN
RE_DAC2_
GAIN
I-DAC2
I-DAC1
1
0
1
0
SEL (CMOS)
“ H”
“ L”
DAC1_GAIN
DAC2_GAIN
Imod
Ibias
1/2
1/2
1
1
IBIAS
LD
Direct data
Latched data with clock
Full code (typ)
Full code (typ)
Output current @
Output current @
Driver
IMOD
85 mA
43 mA
54 mA
27 mA
-12-
IMODN
Output Current
Range (typ)
Output Current
Range (typ)
0 to 85 mA
0 to 43 mA
0 to 54 mA
0 to 27 mA
Current step /
Current step /
LSB (typ)
LSB (typ)
0.333 mA
0.169 mA
0.212 mA
0.106 mA
[AK2573A]
2004/5