参数资料
型号: DS1874T+T&R
厂商: Maxim Integrated
文件页数: 12/88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: 2,500
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: 带卷 (TR)
安装类型: 表面贴装
其它名称: 90-1874T+TRL

SFP+ Controller with Digital LDD Interface
Typical Operating Circuit
+3.3V
100 Ω
PIN-ROSA
MAX3798/MAX3799
LA
LOS
3W
MODE
DAC
BIAS
RSEL
FAULT
DISABLE
VCSEL-TOSA
BMON
LDD
DAC
3W
DS1874
EEPROM
QUICK
TXF
TXD
TXDOUT
TX_FAULT
TX_DISABLE
MON1
MON2
TRIP
I 2 C
SDA
SCL
MODE_DEF2 (SDA)
MODE_DEF1 (SCL)
ADC
MON3
RSEL
RSELOUT
RATE SELECT
R BD
R MON
LOS
LOS
LOSOUT
LOS
Detailed Description
The DS1874 integrates the control and monitoring func-
tionality required to implement a VCSEL-based SFP or
SFP+ system using Maxim’s MAX3798/MAX3799 com-
bined limiting amplifier and laser driver. Key compo-
nents of the DS1874 are shown in the Block Diagram
and described in subsequent sections.
MAX3798/MAX3799 DAC Control
The DS1874 controls two 9-bit DACs inside the
MAX3798/MAX3799. One DAC is used for laser bias
control while the other is used for laser modulation con-
trol. The DS1874 communicates with the MAX3798/
MAX3799 over a 3-wire digital interface (see the 3-Wire
Master for Controlling the MAX3798/MAX3799 section).
The communication between the DS1874 and
MAX3798/MAX3799 is transparent to the end user.
BIAS Register/APC Control
The MAX3798/MAX3799 control their laser bias current
DAC using the APC loop within the DS1874. The APC
loop’s feedback to the DS1874 is the monitor diode
(MON2) current, which is converted to a voltage using
12
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