DS1863 datasheet(8/62 Pages) MAXIM

Part #	DS1863

Description	Burst-Mode PON Controller With Integrated Monitoring

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Manufacturer	MAXIM [Maxim Integrated Products]

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Burst-Mode PON Controller

With Integrated Monitoring

8

_____________________________________________________________________

Detailed Description

The DS1863 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 low power CMOS process, while leaving only

the high speed portions to the laser driver IC.

APC Control

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.

The APC loop’s feedback is the monitor diode (BMD)

current, which is converted to a voltage using an exter-

nal resistor. The feedback voltage is compared to an 8-

bit scaleable voltage reference, which determines the

APC set point of the system. Scaling of the reference

voltage along with the modulation output can be uti-

lized to implement GPON power leveling.

The DS1863 has a Lookup Table to allow the APC set

point to change as a function of temperature to com-

pensate for Tracking Error (TE). The TE LUT (Table

05h), has 36 entries that determine the APC setting in

4°C windows between -40°C to +100°C.

Ranging of the APC DAC is possible by programming a

single byte in Table 02h.

Typical Operating Circuit

BEN+

BEN-

DIS

MAX3643

IN-

IN+

OUT-

BIAS-

BIAS+

MDIN

COMPACT BURST MODE

LASER DRIVER

DS1863

BURST MODE

MONITOR/CONTROL CIRCUIT

MDOUT

OUT+

VCC

TX-F

TX-D

SCL

SDA

MON2

MON3

FETG

MON1

BMD

3.3V

TRANSMIT POWER

RECEIVE POWER

I2C COMMUNICATION

FAULT OUTPUT

DISABLE INPUT

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DS1863 Datasheet(PDF) 8 Page - Maxim Integrated Products

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