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参数资料
| 型号： | DS1862AB+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA25 |
| 封装： | 5 X 5 MM, ROHS COMPLIANT, CSBGA-25 |
| 文件页数： | 7/42页 |
| 文件大小： | 586K |
| 代理商： | DS1862AB+ |
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DS1862A
XFP Laser Control and Digital Diagnostic IC
______________________________________________________________________________________
15
Detailed Description
The DS1862A’s block diagram is described in detail
within the following sections and memory map/memory
description.
Automatic Power Control (APC)
The DS1862A’s APC is accomplished by closed-loop
adjustment of the bias current (BIASSET) until the feed-
back current (BMD) from a photodiode matches the
value determined by the APC registers. The relation-
ship between the APC register and IBMD is given by:
IBMD = 5.859μA x APCC<7:0> +
(1.464μA x APCF<1:0>)
where APCC<7:0> is the 8-bit value in Table 04h, Byte
84h that controls the coarse BMD current, and
APCF<1:0> is the 2-bit value that controls the fine BMD
current.
The BMD pin appears as a voltage source in series
with two resistors. The overall equivalent resistance of
the BMD input pin can be closely approximated by the
plot in Figure 8. The voltage that appears on the BMD
pin, assuming no external current load, is 1.2V if BMD
is in sink-current mode (SRC_SINK_B = 0) or 2.0V if
BMD is set to source current (SRC_SINK_B = 1). This
allows the photodiode to be referenced to either VCC3
or GND. When the control loop is at steady state, the
BMD current setting matches the current that is mea-
sured by the IBMD voltage across the internal resis-
tance. During a transient period, the DS1862A adjusts
the current drive on the BIASSET pin to bring the loop
into steady state. The DS1862A is designed to support
loop gains of 1/20 to 10.
On power-up, the BMD current ramps up to the previ-
ously saved current setting in EEPROM APC registers.
While operating, the DS1862A monitors the BMD cur-
rent. If it begins to deviate from the desired (set) IBMD
value, the current on the BIASSET pin is again adjusted
to compensate.
Extinction Ratio Control
Lookup Table (LUT)
The DS1862A uses a temperature indexed lookup table
(LUT) to control the extinction ratio. The MODSET pin is
capable of sinking current based on the 8-bit binary value
that is controlling it. The DS1862A also features a user-
configurable current range to increase extinction ratio
resolution. Five current ranges, as described in Table 1,
are available to control the current entering MODSET.
IBMD
VOLTAGE
BMD
NOTE: VBMD IS
CONTROLLED BY THE
SRC_SINK_B BIT IN
TABLE 04h.
IBMD (mA)
R
BMD
(Ω
)
1.50
1.25
0.25
0.50
0.75
1.00
BMD RESISTANCE vs. BMD SUPPLY CURRENT
470
489
508
527
546
565
584
600
0
VBMD
RBMD
Figure 8. Approximate Model of the BMD Input
Table 1. Selectable Current Ranges for
MODSET
LUT CURRENT RANGE
TABLE 04h, BYTE 86h<2:0>
CURRENT RANGE
(μA)
000
0 to 75
001
0 to 150
010
0 to 300
011
0 to 600
100
0 to 1200
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1862AB+ | 功能描述:激光驱动器 XFP Laser Control & Digital Diagnostic RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
| DS1862AB+T&R | 制造商:Maxim Integrated Products 功能描述:XFP LASER CONTROL 25CSBGA - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC LASR CTRLR 7CHAN 5.5V 25CSBGA |
| DS1862AB+T&R | 功能描述:激光驱动器 XFP Laser Control & Digital Diagnostic RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
| DS1862AB+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:XFP Laser Control and Digital Diagnostic IC |
| DS1862B | 功能描述:激光驱动器 RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
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