参数资料
型号: DS1873T+
厂商: Maxim Integrated
文件页数: 22/86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
V CC
R PU
TXDS
SET BIAS DAC AND
MOD DAC TO 0
TXD
TXD
TXDC
C
C
R
Q
Q
FETG
TXDIO
TXDFG
TXDOUT
TXP HI FLAG
D
S
TXDFLT
TXP HI ENABLE
BIAS MAX
BIAS MAX ENABLE
HBAL FLAG
HBAL ENABLE
TXP LO FLAG
TXP LO ENABLE
FAULT RESET TIMER
MINT
HBAL FLAG
TXP LO FLAG
TXP HI FLAG
BIAS MAX FLAG
TXF
TXF
TXD EXT
OUT
IN
(130ms)
IN
POWER-ON
RESET
= PINS
OUT
Figure 13. Logic Diagram 1
TXF, TXD, TXDOUT
TXDOUT is generated from a combination of TXF, TXD,
and the internal signal FETG. A software control identical
to TXD is available (TXDC, Lower Memory, Register
6Eh). A TXD pulse is internally extended (TXD EXT ) by
time t INITR1 to inhibit the latching of low alarms and
warnings related to the APC loop to allow for the loop to
stabilize. The nonlatching alarms and warnings are TXP
LO, LOS LO, and MON1–MON4 LO alarms and warn-
ings. In addition, TXP LO is disabled from creating FETG.
TXF is both an input and an output (Figure 13). See the
IN1
RSEL
IN1S
IN1C
RSELS
RSELC
INVOUT1
OUT1
RSELOUT
Transmit Fault (TXF) Output section for a detailed expla-
nation of TXF. Figure 13 shows that the same signals and
faults can also be used to generate the internal signal
FETG (Table 01h/05h, Registers FAh and FBh). FETG is
used to send a fast “turn-off” command to the laser dri-
ver. The intended use is a direct connection to the laser
driver’s TXD input if this is desired. When V CC < POA,
TXDOUT is high impedance.
LOS
LOS LO
LOSC
MUX
INV LOS
RXL
= PINS
LOSOUT
Figure 14. Logic Diagram 2
22
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