参数资料
| 型号： | DS1862B+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/43页 |
| 文件大小： | 0K |
| 描述： | IC LASR CTRLR 7CHAN 5.5V 25CSBGA |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 激光二极管控制器（光纤） |
| 数据速率： | 10Gbps |
| 通道数： | 7 |
| 电源电压： | 2.9 V ~ 5.5 V |
| 电流 - 电源： | 3mA |
| 工作温度： | -40°C ~ 100°C |
| 封装/外壳： | 25-TFBGA，CSPBGA |
| 供应商设备封装： | 25-BGA（5x5） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
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XFP Laser Control and Digital Diagnostic IC
Detailed Description
The DS1862 ’s block diagram is described in detail
within the following sections and memory map/memory
description.
Automatic Power Control (APC)
The DS1862’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 I BMD is given by:
I BMD = 5.859μA x APC C <7:0> +
(1.464μA x APC F <1:0>)
where APC C <7:0> is the 8-bit value in Table 04h, Byte
84h that controls the coarse BMD current, and
APC F <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
On power-up, the BMD current ramps up to the previ-
ously saved current setting in EEPROM APC registers.
While operating, the DS1862 monitors the BMD current.
If it begins to deviate from the desired (set) I BMD value,
the current on the BIASSET pin is again adjusted to
compensate.
Extinction Ratio Control
Lookup Table (LUT)
The DS1862 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 DS1862 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.
Table 1. Selectable Current Ranges for
MODSET
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 V CC3 or GND.
When the control loop is at steady state, the BMD current
setting matches the current that is measured by the I BMD
voltage across the internal resistance. During a transient
period, the DS1862 adjusts the current drive on the
BIASSET pin to bring the loop into steady state. The
DS1862 is designed to support loop gains of 1/20 to 10.
BMD RESISTANCE vs. BMD SUPPLY CURRENT
600
584
565
546
LUT CURRENT RANGE
TABLE 04h, BYTE 86h<2:0>
000
001
010
011
100
I BMD
VOLTAGE
CURRENT RANGE
(μA)
0 to 75
0 to 150
0 to 300
0 to 600
0 to 1200
527
508
R BMD
BMD
489
470
0
V BMD
NOTE: V BMD IS
CONTROLLED BY THE
SRC_SINK_B BIT IN
TABLE 04h.
0
0.25
0.50
0.75
1.00
1.25
1.50
I BMD (mA)
Figure 8. Approximate Model of the BMD Input
____________________________________________________________________
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