The DS1865 controls and monitors all the burst-mode
transmitter and video receiver biasing functions for a
passive optical network (PON) triplexer. It has an APC
loop with tracking-error compensation that provides the
reference for the laser driver bias current and a temperature-indexed lookup table (LUT) that controls the modulation
current. It continually monitors for high output
current, high bias current, and low and high transmit
power with its internal fast comparators to ensure that
laser shutdown for eye safety requirements are met without
adding external components. Six ADC channels
monitor VCC, internal temperature, and four external
monitor inputs (MON1—MON4) that can be used to meet
transmitter and video receive signal monitoring requirements.
Two digital-to-analog converter (DAC) outputs
are available for biasing the video receiver channel, and
five digital I/O pins are present to allow additional monitoring
and configuration.
Key Features
Applications/Uses
Meets GEPON, BPON, and GPON Timing Requirements for Burst-Mode Transmitters
Bias Current Control Provided by APC Loop with Tracking-Error Compensation
Modulation Current is Controlled by a Temperature-Indexed Lookup Table
Laser Power Leveling from -6dB to +0dB
Two 8-Bit Analog Outputs, One is Controlled by MON4 Voltage for Video Amplifier Gain Control
Internal Direct-to-Digital Temperature Sensor
Six Analog Monitor Channels: Temperature, VCC, MON1, MON2, MON3, and MON4
Five Digital I/O Pins for Additional Control and Monitoring Functions
Comprehensive Fault Management System with Maskable Laser Shutdown Capability
Two-Level Password Access to Protect Calibration Data
120 Bytes of Password 1 Protected Nonvolatile Memory
128 Bytes of Password 2 Protected Nonvolatile Memory in Main Device Address
128 Bytes of Nonvolatile Memory Located at A0h Slave Address
I²C-Compatible Interface for Calibration and Monitoring
Operating Voltage: 2.85V to 5.5V
Operating Temperature Range: -40°C to +95°C
Packaging: 28-Pin Lead-Free TQFN (5mm x 5mm x 0.8mm)
Optical Triplexers with BPON, GPON, or GEPON Transceiver
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-3 of 3
DS1865
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Status
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
DS1865K
Active
Land Pattern: Not Available
-40°C to +85°C
See data sheet
DS1865T+
Active
TQFN;28 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0028 (PDF)
Use pkgcode/variation: T2855+8*
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