Advance Data Sheet, Rev. 1

October 2001

R485-Type Lightwave Receiver with Clock
Recovery for 2.488 Gbits/s Applications

Manufactured in a low-profile, 24-pin package, the R485-Type
Receiver features either an avalanche or PIN photodetector, a
transimpedance amplifier, a limiting amplifier, and a clock and
data recovery IC.

Features

Multisourced footprint

Internal APD bias supply

Differential data and clock outputs

APD and PIN versions

Typical sensitivity:
--APD, 32 dBm
--PIN, 23 dBm

Operation at 1.3

m or 1.55

TTL link status flag

Wide operating case temperature range:
--APD, 0

C to +70

--PIN, 40

C to +85

Space-saving, self-contained, 24-pin DIP

Agere Systems Inc. Reliability and Qualification
Program for built-in quality

SONET/SDH compatible for OC-48/STM-16 data
rate

Applications

Telecommunications

-- Inter- and intraoffice SONET/SDH
-- Subscriber loop
-- Metropolitan area networks

High-speed data communications

Description

The R485-Type 2.5 Gbits/s lightwave receiver is
designed for use in SONET OC-48 and synchronous
digital hierarchy (SDH) STM-16 telecommunications
applications and high-speed data communications
applications. The receiver converts received optical
signals in the range of 1.2

m to 1.6

m wavelength

into differential data and clock outputs. The receiver
consists of either InGaAs APD or PIN photodetector
(depending on model selected), a transimpedance
amplifier, a limiting amplifier, and a clock and data
recovery IC (CDR). The CDR uses PLL technology to
extract the clock signal from the converted optical
signal. A TTL compatible link status flag signal indi-
cates when there is a loss of optical signal.

The receiver is manufactured in a low-profile, pig-
tailed, 24-pin plastic DIP package. It requires a sin-
gle, +5.0 V power supply. The APD version has the
added benefit of containing the high-voltage supply
internal to the receiver. This internal supply also pro-
vides the necessary temperature compensation for
the APD.

Agere Systems Inc.

Advance Data Sheet, Rev. 1

October 2001

Recovery for 2.488 Gbits/s Applications

R485-Type Lightwave Receiver with Clock

Flag Output

When the incoming optical signal falls below the link-
status switching threshold, the FLAG output is asserted
and the FLAG output logic level changes from a TTL
low to a TTL high.

Pin Information

Table 1. Pin Information

* Pins designated as no user connect (NUC) are connected inter-

nally. The user should not make any connections to these pins.

The loss of signal (LOS) FLAG output is a logic level that indicates

the presence or absence of a minimum acceptable level of optical
input. A TTL logic HIGH indicates the absence of a valid optical
input signal.

This pin is not internally connected if the amplitude decision

threshold (DTV) is not made adjustable.

Handling Precautions

The R485-Type receiver is manufactured with a
39 in.

4 in. (100 cm

10 cm) single-mode fiber pigtail

with a 900

m OD PVC outer jacket. Both SC and FC-

PC connectors are offered on standard versions. Other
optical connector options are available on special
order. Please contact an Agere Systems Account Man-
ager for availability and ordering information.

The minimum fiber bending radius is 1.5 inches
(38 mm).

Receiver Processing

The R485-Type receiver devices can withstand normal
wave soldering processes. The complete receiver mod-
ule is not hermetically sealed; therefore, it should not
be immersed in, or sprayed with, any solutions. The
optical connector process cap deformation temperature
is 85

C. The receiver pins can be wave soldered at

250

C for 10 seconds.

Electrostatic Discharge

CAUTION: This device is susceptible to damage as

a result of electrostatic discharge (ESD).
Take proper precautions during both
handling and testing. Follow guidelines
such as JEDEC Publication No. 108-A
(Dec. 1988).

Although protection circuitry is designed into the
device, take proper precautions to avoid exposure to
ESD.

Agere employs a human-body model HBM) for ESD-
susceptibility testing and protection design evaluation.
ESD voltage thresholds are dependent on the critical
parameters used to define the model. A standard HBM
(resistance = 1.5 k

, capacitance = 100 pF) is widely

used and, therefore, can be used for comparison pur-
poses.

Installation Considerations

Although the receiver has been designed with rugged-
ness in mind, care should be used during handling.
The optical connector should be kept free from dust.
The optical connector process cap should be kept in
place as a dust cover when the device is not connected
to a cable. If contamination is present on the optical
connector, the use of canned air with a extension tube
should remove any loose debris. Other cleaning proce-
dures are outlined in the

Cleaning Fiber Optic Assem-

blies

Technical Note (TN95-010LWP).

The cable should be handled conservatively with no
excessive axial pulling or lateral tugging.

Pin

Name

Pin

Name

NIC

NUC*

LOS Flag

Ground

NUC*

CLOCK

Ground

CLOCK

Ground

NIC

Ground

DATA

Ground

DATA

Ground

DTV/NIC

Advance Data Sheet, Rev. 1
October 2001

Recovery for 2.488 Gbits/s Applications

R485-Type Lightwave Receiver with Clock

Agere Systems Inc.

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.

Characteristics

Table 2. Optical Characteristics

At 1.3

m wavelength and 1 x 10

BER with 2

1 NRZ pseudorandom data.

* Over operating temperature range and at end of life.
Typical values at room temperature and beginning of life.

Parameter

Symbol

Min

Max

Unit

Operating Case Temperature Range:

APD
PIN

70
85

Storage Temperature

stg

Optical Input Power--Biased:

APD
PIN

--
--

0
8

dBm
dBm

Supply Voltages

6.5

Lead Soldering Temperature/Time

250/10

C/s

Parameter

Symbol

Min*

Typ

Max*

Unit

Measured Average Sensitivity:

APD
PIN

MIN

--
--

32
23

30
21

dBm
dBm

Maximum Input Power:

APD
PIN

MAX

--
--

dBm
dBm

Link Status Switching Threshold

Decreasing Light Input:

APD
PIN

LSTD
LSTD

45
34

40
27

35
24

dBm
dBm

Flag Response Time

FLAG

1000

Flag Hysteresis

1.2

Optical Reflectance:

Single-mode Fiber
Multimode Fiber

--
--

27
14

dB
dB

Advance Data Sheet, Rev. 1

October 2001

Recovery for 2.488 Gbits/s Applications

R485-Type Lightwave Receiver with Clock

Agere Systems Inc.

Characteristics

(continued)

Table 3. Electrical Characteristics

* Typical values measured at room temperature and beginning of life.
Measured with a 50

to ground. Outputs must be ac-coupled (see Figure 2).

TTL output.

Parameter

Symbol

Min

Typ*

Max

Unit

Bit Rate

2488.07

2488.32

2488.57

Mbits/s

dc Power Supply Voltages

4.75

5.0

5.25 V

Power Consumption

1.3

2.0

Output Data/Clock Voltage:

Single Output
Differential Output

SV
DV

0.3
0.6

0.4
0.8

1.0
2.0

Vp-p
Vp-p

Output Flag Voltage:

High
Low

FOH

FOL

2.5

5.0
0.2

0.8

V
V

Clock/Data Alignment (see Figure 1)

CDA

±40

Clock Duty Cycle

Jitter Generation

0.005

<0.01

Ul rms

Jitter Transfer (see Figure 2)

<0.1

Jitter Tolerance (see Figure 3)

Telcordia Technologies

TM GR-253-Core and ITU-T G.958 Compliant

Advance Data Sheet, Rev. 1

October 2001

Recovery for 2.488 Gbits/s Applications

R485-Type Lightwave Receiver with Clock

Agere Systems Inc.

Qualification and Reliability

The R485-type receiver is scheduled to complete the following qualification tests to meet the intent of

Telcordia

Technologies

GR-468-CORE.

Table 4. R485 Qualification Information

Test

Reference

Conditions

Code

Type

Sample

Size

Pass/Fail Criteria

Note

Mechanical Shock MIL-STD-883

Method 2002

Condition B

5 times/axis

500 G, 1 ms

R485
R480

Pieces

Change in Receiver

Sensitivity: 1.5 dB

Qualified by

T48/P172

Sine Vibration

MIL-STD-883

Method 2007

Condition A

20 G, 20 Hz--2000 Hz

4 min./cycle

4 cycles/axis

R485
R480

Pieces

Change in Receiver

Sensitivity: 1.5 dB

Qualified by

T48/P172

Thermal Shock

MIL-STD-883

Method 1011

T = 100 °C

R485
R480

Pieces

Physical Attributes

and Leak Check

Qualified by

T48/P172

Solderability

MIL-STD-883

Method 2003

(Package Supplier Test)

Qualified by

T48

Lead

Integrity

MIL-STD-883

Method 2004

(Package Supplier Test)

Qualified by

T48

Solvent

Resistance

MIL-STD-883

Method 2015

(Package Supplier Test)

Qualified by

T48

Fiber Pull

GR-468-CORE

Table 6

1 kg; 3 times; 5 s

R485
R480

Pieces

Change in Receiver

Sensitivity: 1.5 dB

Qualified by

P172

Accelerating

Aging

(HTOB)

MIL-STD-883

Method 1005

85 °C under bias,

2000 hours

R485
R480

Pieces

Change in Receiver

Sensitivity: 1.5 dB

Qualified by

T48/P172;

Refer to

Chip Data

High Temperature

Storage

GR-468-CORE

Table 6

85 °C storage,

2000 hours

R485
R480

Pieces

Change in Receiver

Sensitivity: 1.5 dB

Qualified by

T48/P172

Temperature

Cycling

GR-468-CORE

Section 5.20

40 °C to +85 °C

100 Cycles for Pass/Fail

R485
R480

Pieces

Change in Receiver

Sensitivity: 1.5 dB

Qualified by

T48/P172

Temperature

Humidity Bias

GR-468-CORE

Table 6

85 °C/85% RH

1000 hours

R485
R480

Pieces

Change in Receiver

Sensitivity: 1.5 dB

Qualified by

T48/P172

Internal Water

Vapor

MIL-STD-883

Method 1018

5000 ppm Water Vapor

R485
R480

Pieces

Change in Receiver

Sensitivity: 1.5 dB

Qualified by

T48/P172

ESD

GR-468-CORE

Section 5.22

Human-Body Model

R485
R480

Pieces

Threshold

Minimum: 500 V

Advance Data Sheet, Rev. 1
October 2001

Recovery for 2.488 Gbits/s Applications

R485-Type Lightwave Receiver with Clock

Agere Systems Inc.

PWB Layout Guidelines

The data and clock outputs are designed to drive 50

loads.

Clock and data output traces must be controlled-impedance lines and the termination impedance must match
the line impedance. Avoid 90

bends in the traces. Paired lines (i.e., DATA and DATA) must be equal in length.

Data and clock output lines should be as short and straight as possible and should be shielded from noise
sources to prevent noise from feeding back into the receiver.

Use high-quality multilayer printed-wiring boards. A ground plane should occupy the area directly beneath the
receiver.

1-934(F)xxx

Note 1: Data and clock outputs must be ac-coupled on customer board. Use a 0.1

F chip capacitor with a low ESR. For optimum receiver per-

formance, all four outputs must be terminated in equivalent loads, even if some of the outputs are not being used.

Note 2: The 0.1

F V

power supply bypass capacitors should be high-quality, low ESR chip capacitors that are located as close as possible to

the appropriate power supply leads and should provide a low inductance path to the ground plane.

Figure 4. Biasing and Interfacing to the R485-Type 2.5 Gbits/s Receiver

8, 22

CLOCK

DATA

TRANSMISSION

4, 7, 9, 12,

2.2

+5 V

0.1

14--17, 19, 20

LINE (4X)

0.1

NOTE 2

NOTE 1

LOS (FLAG)

0.1

NIC

0.1

Advance Data Sheet, Rev. 1
October 2001

Recovery for 2.488 Gbits/s Applications

R485-Type Lightwave Receiver with Clock

Agere Systems Inc.

Ordering Information

Table 5. Ordering Information for the R485-Type Receiver

Table 6. Related Product Information

Code

Detector Type

Connector Type

Fiber Type

Comcode

R485CMAA

APD

SC/PC

Single-Mode

108514597

R485FMAA

APD

FC/PC

Single-Mode

108514613

R485WMAA

APD

Single-Mode

TBD

R485JMAA

APD

Single-Mode

TBD

R485CPAA

SC/PC

Single-Mode

108514605

R485FPAA

FC/PC

Single-Mode

108514621

R485WPAA

Single-Mode

TBD

R485JPAA

Single-Mode

TBD

R485CPBB

SC/PC

Multimode

TBD

R485FPBB

FC/PC

Multimode

TBD

R485WPBB

Multimode

TBD

R485JPBB

Multimode

TBD

Product Code

Description

Document Number

T48 Transmitter

2.5 Gbits/s Uncooled Laser Transmitter

DS00-088OPTO

Advance Data Sheet, Rev. 1

October 2001

Recovery for 2.488 Gbits/s Applications

R485-Type Lightwave Receiver with Clock

Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.

October 2001
DS01-005OPTO-1 (Replaces DS01-005OPTO)

For additional information, contact your Agere Systems Account Manager or the following:
INTERNET:

http://www.agere.com

E-MAIL:

docmaster@agere.com

N. AMERICA:

Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286
1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)

ASIA:

Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon
Tel. (852) 3129-2000, FAX (852) 3129-2020
CHINA: (86) 21-5047-1212 (Shanghai), (86) 10-6522-5566 (Beijing), (86) 755-695-7224 (Shenzhen)
JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 778-8833, TAIWAN: (886) 2-2725-5858 (Taipei)

EUROPE:

Tel. (44) 7000 624624, FAX (44) 1344 488 045

Telcordia Technologies

is a trademark of Telcordia Technologies Inc.

Document Outline

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Document Outline

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