DS1865T+T&R Maxim Integrated Products, DS1865T+T&R Datasheet - Page 10

• Manufacturer Part Number: DS1865T+T&R
• Description: IC PON CONTROL TRI 28-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of DS1865T+T&R

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PON Triplexer Control and
Monitoring Circuit
The DS1865 integrates the control and monitoring func-
tionality required to implement a PON system using
Maxim’s MAX3643 compact burst-mode laser driver.
The compact laser driver solution offers a considerable
cost benefit by integrating control and monitoring fea-
tures in the low-power CMOS process, while leaving
only the high-speed portions to the laser driver. Key
components of the DS1865 are shown in the Block
Diagram and described in subsequent sections. Table 1
contains a list of acronyms used in this data sheet.
BIAS current is controlled by an average power control
(APC) loop. The APC loop uses digital techniques to
overcome the difficulties associated with controlling
burst-mode systems.
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OPEN-DRAIN LOS OUTPUT
I
2
C COMMUNICATION
DISABLE INPUT
FAULT OUTPUT
RECEIVER LOS
ADDITIONAL
DIGITAL I/O
Detailed Description
IN+
IN-
BEN+
BEN-
DIS
SDA
SCL
TX-F
TX-D
LOSI
D0
D1
D2
D3
MONITOR/CONTROL CIRCUIT
COMPACT BURST-MODE
LASER DRIVER
BURST-MODE
MAX3643
APC Control
DS1865
MDOUT
M4DAC
BIAS+
MON1
MON2
MON3
MON4
BIAS-
MDIN
OUT+
DAC1
FETG
OUT-
BMD
V
CC
TRANSMIT POWER
RECEIVE POWER
Table 1. Acronyms
3.3V
ACRONYM
APD BOOST DC-DC
ADC
DAC
PON
APC
ATB
LUT
SEE
TXP
NV
QT
TE
THERMISTOR
3.3V
Typical Operating Circuit
Analog-to-Digital Converter
Average Power Control
Alarm Trap Bytes
Digital-to-Analog Converter
Lookup Table
Nonvolatile
Passive Optical Network
Quick Trip
Shadowed EEPROM
Tracking Error
Transmit Power
12V
DEFINITION
FTTH CATV
MAX3654
TIA
CATV