Rainbow-electronics DS1842A User Manual download pdf

General Description

The DS1842A integrates the discrete high-voltage

components necessary for avalanche photodiode

(APD) bias and monitor applications. A switch FET and

precision voltage-divider network are used in conjunc-

tion with an external DC-DC controller to create a boost

DC-DC converter. A current clamp limits current

through the APD and also features an external shut-

down. The precision voltage-divider network is provid-

ed for precise control of the APD bias voltage. The

device also includes a dual current mirror to monitor

the APD current.

Applications

APD Biasing

GPON ONU and OLT

Features

♦ 76V Maximum Boost Voltage

♦ Switch FET

♦ Current Monitor with a Wide 1µA to 2mA Range,

Fast 50ns Time Constant, and 10:1 and 5:1 Ratio

♦ 2mA Current Clamp with External Shutdown

♦ Precision Voltage Feedback

♦ Multiple External Filtering Options

♦ 3mm x 3mm, 14-Pin TDFN Package with Exposed Pad

DS1842A

76V, APD, Bias Output Stage with

Current Monitoring

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4994; Rev 0; 10/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

DS1842AN+ -40°C to +85°C 14 TDFN-EP*

DS1842AN+T&R -40°C to +85°C 14 TDFN-EP*

Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

EP = Exposed pad.

DS1875

DS1842A

COMP

MON3

GATE

PGND

FBOUT

MIRIN

FBIN

MIR1

CLAMP

NOTE: SEE THE LAYOUT CONSIDERATIONS SECTION.

MIROUTGNDEP

3.3V

CURRENT MIRROR

CURRENT

LIMIT

MIR2

BULK

COMP

EXTERNAL MONITOR

TIA

APD

ROSA

Typical Application Circuit

1 2 3 4 5 6

Current Monitoring 1

Summary of Contents

Page 1 - Current Monitoring

General DescriptionThe DS1842A integrates the discrete high-voltagecomponents necessary for avalanche photodiode(APD) bias and monitor applications. A

Page 2

DS1842A76V, APD, Bias Output Stage withCurrent Monitoring2 _______________________________________________________________________________________ABSO

Page 3

DS1842A76V, APD, Bias Output Stage withCurrent Monitoring_______________________________________________________________________________________3Typic

Page 4

DS1842A76V, APD, Bias Output Stage withCurrent Monitoring4 _______________________________________________________________________________________Typi

Page 5

DS1842A76V, APD, Bias Output Stage withCurrent Monitoring_______________________________________________________________________________________ 5Pin

Page 6

The mirror output is typically connected to an ADCusing a resistor to convert the mirrored current into avoltage. The resistor to ground should be sel

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Rainbow-electronics DS1842A User Manual

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Summary of Contents

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