418

(5/97)

Preliminary Product Disclaimer

This preliminary data sheet is provided to assist you in the evaluation of engineering samples of the product which is under development
and targeted for release during 1997. Until Hewlett-Packard releases this product for general sales, HP reserves the right to alter prices,
specifications, features, capabilities, function, manufacturing release dates, and even general availability of the product at any time.

Fiber Optic "Light to Logic"
Receiver

Preliminary Technical Data

RCV1551

Features

· Light to Logic 20-pin DIP

Receiver Offers ECL
Compatibility

· Long Reach, High

Performance

· Sensitivity -35 dBm

· Single +5 V Supply

· SONET/SDH Compliant

· Multisourced

Applications

· Telecommunication

Networks

· SONET OC3 and SDH STM1

Compatible

· Local and Metropolitan Area

Networks

· ATM Single Mode Public

Network

· Military Communications

and Control Systems
Performance

· Digital Cable TV Networks

Description

The RCV1551 receiver provides
optical signal conversion and
processing. It contains an InGaAs
PIN photodiode and high
sensitivity, wide dynamic range,
transimpedance amplifier,
capacitively coupled to limiting
amplifier stages with PECL
output drivers. Also provided is a
loss of signal alarm.

The planar PIN photodiode
operates throughout the 1200 nm
to 1600 nm wavelength band. A
CMOS wide dynamic range
transimpedance amplifier
optimized for 155 MBd operation
provides low noise front end gain
for the RCV1551.

A low pass filter maximizes the
signal to noise ratio while
minimizing intersymbol
interference. The interface
amplifier provides signal
conversion and buffering for the
PECL complementary data
outputs. A complementary PECL
alarm output is also provided.

The receiver operates from +5 V
and -5.2 V or +5 V and Ground
power supplies. A 50/125 micron
multimode fiber pigtail is
included, assuring compatibility
with multimode and single mode
fiber optic systems.

419

GND

DATA

GND

DATA

PD BIAS

GND

ALARM

GND

ALARM

+5 V

FIBER PIGTAIL

Connection Diagram

Top View

Pin Descriptions

Pins 5, 17, 18, 19, 20 NC:

These pins are not connected and
should be left open circuit on the
application PCB.

Pins 1, 2, 3, 4, 6, 8, 13, 15, 16
GND:

These pins should be connected
to the circuit ground.

Pins 7, 9, DATA, DATA:

These pins provide complemen-
tary PECL DATA and DATA
outputs. The DATA output is
noninverting, an optical pulse
causes the DATA output to go to
the PECL logic high state (+4 V
nominal).

Pin 10, PD Bias:

This pin must be connected to
any voltage from 0 V (GND) to
-5 V. This provides the
photodiode bias. The current
drawn is directly proportional
to the average received
photocurrent.

I = Responsitivity x Mean Power.

The responsivity will be between
0.7 A/W and 1.0 A/W.

Pin 11, +5 V:

This pin should be connected to
+5 V supply. The network shown
below should be placed as close
as possible to pin 11.

Pins 12, 14 ALARM, ALARM:

These pins provide complemen-
tary differential ALARM and
ALARM outputs. This is the low
light alarm. ALARM goes to a
logic low (3.3 V nominal) state
when the optical power drops
below the threshold level
(insufficient optical power).

The optical power must increase
to a higher level than the level
where the alarm went low before
ALARM will return to a logic
high. This difference is the alarm
hysteresis.

1 µH

+5 V

100 nF

10 µF

PIN 11

420

drawn from the module. This will
lower the power supply noise
generated by the receiver and
improve performance at low
optical input power levels.

Power Supplies

The RCV1551 will operate to
specifications with a single +5 V
power supply (Pin 10 Grounded).
The -5 V PIN bias is provided to
maintain functional compatibility
with second sources.

Circuit Layout

The RCV1551 uses very high
bandwidth circuitry to achieve its
high level of performance. Care
must be taken to ensure stable
operation. The use of ground
planes and transmission line
interconnects is required. The use
of a standard evaluation board is
highly recommended for those

users who are not familiar with
these techniques.

Signal traces should conform to
ECL design rules to prevent
reflections and ringing from
degrading performance. Useful
guidelines are contained in ECL
manufacturer design manuals.

Manufacturing

The fiber pigtail on the device
requires normal fiber handling
considerations. Care should be
taken to avoid tight bends as well
as excessive tension on the fiber
pigtail.

The allowable temperature range
for the RCV1551 is limited by the
material used in the pigtail.
Exposure to temperatures over
+85

C is not recommended. Low

profile sockets and hand
soldering are recommended for
this part.

Figure 1. Block Diagram.

Functional Description

Design

The receiver contains an InGaAsP
photodetector, transimpedance
amplifier and interface amplifier
circuit. It is designed with a
multimode fiber pigtail to allow
maximum flexibility in connector
options.

The interface amplifier is
capacitively coupled to the
preamplifier circuit.

Terminating the Outputs

The data outputs of the RCV1551
are PECL compatible. Care
should be taken to match
termination impedances to the
interconnect to minimize
reflection effects. Both serial data
outputs (DATA and DATA) should
be terminated identically, even if
only one output is used, in order
to balance the drive currents

TRANSIMPEDANCE
AMPLIFIER

LOW PASS FILTER

VCC (+5 V)

GND (0 V)

ALARM

DATA

V NEG

(-5 V OR GROUND)

INTERFACE
AMPLIFIER

421

Performance Specifications
Absolute Limiting Ratings

Absolute maximum limits mean that no catastrophic damage will occur if the product is subjected to these ratings for short periods, provided that each limiting
parameter is in isolation and all other parameters have values within the performance specification. It should not be assumed that limiting values of more than
one parameter can be applied to the product at the same time.

Parameter

Symbol

Minimum

Maximum

Units

Note

Supply Voltage

-0.5

+5.5

Supply Voltage

NEG

-10

+0.5

Environmental Parameters

Parameter

Symbol

Minimum

Maximum

Units

Note

Operating Temperature

-40

+85

Storage Temperature

-40

+85

Humidity

%RH

Electrical Parameters

(-40

C to +85

Parameter

Symbol

Minimum

Maximum

Units

Note

Supply Voltage

4.75

5.25

Supply Voltage

NEG

-6.0

Supply Current

130

NEG

Supply Current

1.0

DATA Output Level (high)

3.8

4.15

2, 3

DATA Output Level (low)

3.1

3.5

2, 3

ALARM Output Level (high)

V off

3.8

4.15

2, 3

ALARM Output Level (low)

V on

3.1

3.5

2, 3

Notes:
1. V

of -0.5 V and V

NEG

of +0.5 V may not be applied simultaneously.

2. Output terminated to (V

-2) with 50

load or equivalent.

3. Output voltages are for V

= 5.0 V.

4. Outputs not loaded.

422

ALL DIMENSIONS IN MILLIMETERS

MIN.

NOM.

32.9

9.9

16.0

2.26

2.7

5.2

400

2.54

0.46

10.16

DIM.

MAX.

33.1

10.1

16.3

9.27

2.62

3.2

5.6

1220

Optical Parameters

(-40

C to +85

Parameter

Minimum

Maximum

Units

Note

Wavelength

1200

1600

Receiver Sensitivity

-35

dBm

Maximum Input Power

dBm

Alarm ON

-45

-36

dBm

Hysteresis

0.5

7.0

Alarm Response Time

600

Reliability Target

1000

FIT

Note:
1. At a BER of 1 x 10

-10

, 2

23-1

PRBS pattern NRZ data at the line rate with 10:1 extinction ratio. EOL.

Fiber Pigtail

Typical

Units

Core Diameter

microns

Cladding Diameter

125

microns

Secondary Coating Diameter

900

microns

Drawing Dimensions

Document Outline

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: RCV1551-FP

Document Outline

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: RCV1551-FP