参数资料
型号: DS1873T+
厂商: Maxim Integrated
文件页数: 69/86页
文件大小: 0K
描述: IC CTLR SFP+ ANLG LDD 28-TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 60
类型: 激光二极管控制器
通道数: 1
电源电压: 2.85 V ~ 3.9 V
电流 - 电源: 2.5mA
工作温度: -40°C ~ 95°C
封装/外壳: 28-WFQFN 裸露焊盘
供应商设备封装: 28-TQFN-EP(5x5)
包装: 托盘
安装类型: 表面贴装
其它名称: 90-1873T+000
SFP+ Controller with Analog LDD Interface
Table 02h, Register BAh: IBIASMAX
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
00h
PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)
PW2 or (PW1 and RWTBL2)
Nonvolatile (SEE)
BAh
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
BIT 7
BIT 0
This value defines the maximum DAC value allowed for the upper 8 bits of BIAS output during APC closed-loop
operations. During the intial step and binary search, this value does not cause an alarm, but does still clamp the
BIAS DAC value. After the startup sequence (or normal APC operations), if the APC loop tries to create a BIAS
value greater than this setting, it is clamped and creates a MAX BIAS alarm.
Table 02h, Register BBh: ISTEP
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
00h
PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)
PW2 or (PW1 and RWTBL2)
Nonvolatile (SEE)
BBh
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
BIT 7
BIT 0
The initial step value used at power-on or after a TXD pulse to control the BIAS DAC. At startup, this value plus
2 0 = 1 is continuously added to the BIAS DAC value until the APC feedback (MON2) is greater than its threshold.
At that time, a binary search is used to complete the startup of the APC closed loop. If the resulting math
operation is greater than IBIASMAX (Table 02h, Register BAh), the result is not loaded into the BIAS DAC, but the
binary search is begun to complete the initial search for APC. During startup, the BIAS DAC steps causing a
higher bias value than IBIASMAX do not create the BIAS MAX alarm. The BIAS MAX alarm detection is enabled at
the end of the binary search.
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