Laser Driver. CX60077 Datasheet


CX60077 Driver. Datasheet pdf. Equivalent


Part Number

CX60077

Description

2.5 Gbps Long Haul Laser Driver

Manufacture

Conexant Systems

Total Page 14 Pages
Datasheet
Download CX60077 Datasheet


CX60077
Data Sheet
CX60077
2.5 Gbps Long Haul Laser Driver
Network Access Division
Key Features
Applications
Single supply : -5.2 Volts
Fiber-optic communication systems (OC-48)
CML interface (with capability of receiving ECL level)
SONET/SDH test equipment
Low power consumption 400 mW
Input impedance of 50
Loss of input data detection
mPulse and bias current monitors
1 to 80 mA laser diode bias current
o5 to 80 mA pulse current range
.cProduct Description
UThe CX60077 is a high-speed laser driver designed for use in a transmitter module for fiber-optic communications, such as Synchronous
Optical Network (SONET), Synchronous Digital Hierarchy (SDH), Asynchronous Transfer Mode (ATM), and Dense Wavelength Division
t4Multiplexer (DWDM). This device can achieve a maximum output drive current of 80 mA into a 25 load. Figure 1 illustrates the
functional block diagram, and Table 1 lists terminal descriptions. The CX60077 is available in a 32-pin flat pack, which is illustrated in
Figures 10 and 11.
heeFigure 1. CX60077 Functional Block Diagram
IBCntl IBMon IBOut IPCntl
ataSDutyCntl
.DDataIn
VTTD
wClockIn
wVTTC
mLOSTest
Input Buffers
50
50
Retime
FF
w t4U.coVBBSel
VBB Level
Select
2:1
MUX
DC Bias
Current Cntlr
Duty Cycle
Cntlr
Pulse
Current
Driver
Loss of Signal
Detect
IPoutP
IPoutN
IPMon
LOS
heeRetimDis
www.DataSRev. 2d, 10/26/00.
The information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Conexant Proprietary and Confidential
Pg. 1 of 14

CX60077
2.5 Gbps Long Haul Laser Driver
Table 1. CX60077 Terminal Descriptions
Number
Terminal
Name
Description
27 IBOut Laser diode, DC bias current output
21 IBCntl DC bias current, control signal input
22 IBMon DC bias current monitor
19 LOS Loss of input or clock signal indicator output
15 VBBSel VBB (threshold) Voltage Select between CML and ECL
11 DataIn Data input
17 RetimDis Input for disabling data and clock retiming
24 IBMon2 Additional independent IBMon output
13 ClkIn Clock input
16 LOSTest Loss of Signal test Input (3)
18 DutyCntl Output current, duty cycle control signal input
3, 4, 5, 6, 25
Vee Supply voltage
20 IPCntl Output current, control signal input
23 IPMon Output pulse current monitor
1, 2, 7, 8, 9, 10, 26, 30 Gnd Ground
31, 32
IPOutN Inverted output
28, 29
IPOutP Non-inverted output
14 VTTC 50input clock termination reference
12 VTTD 50input data termination reference
* High Speed Terminal
Type
I/O Rate/DC
Current Sink O
DC
Analog
I
DC
Current Sink O
DC
Current Sink
DC
(1) DC
CML
I 2.5 Ghz*
(2) I DC
Current Sink O
DC
CML
I 2.5 Gbps*
Analog
I
DC
Analog
I
DC
- - DC
Analog
I
DC
Current Sink O
AC
- DC
Current Sink O 2.5 Gbps
Current Sink O 2.5 Gbps
AC Ground I
DC
AC Ground I
DC
Note 1: See Table 2.
Note 2: To select retimed data this terminal can be connected to -2 V or it can float. Connecting the RetimDis terminal to
ground selects non-retimed data.
Note 3: This is an input to allow testing of the LOS function. When it is grounded: Assert LOS output signal continuously. When it is
connected to -2.0 V: Enable LOS function.
Functional Description
The CX60077 2.5 GHz Long Haul Laser Driver translates input data on DataIn from a digital voltage signal to a digital current signal on pins
IpoutP and IpoutN to drive a laser diode. The Input Buffers accept data, clock, and test signals and transfer the buffered signals to their
respective circuits. When the input data and clock are direct coupled, the input threshold level is
set by means of the VBBSel terminal. See Table 2 for the relationship between VBBSel and the input threshold level.
Retimed data is selected with the RetimDis terminal, and the duty cycle of the output signal is controlled with the DutyCntl pin.
The data output pulse current driver IPOut (P/N) is adjusted using the IPCntl pin and monitored using the IPMon pin. A current driver
supplying DC bias for the laser is provided on pin IBOut. The output bias current is monitored using the IBMon and/or IBMon2 pins and
adjusted using the IBCntl pin.
The Loss of Signal (LOS) Detect circuit detects the loss of transitions on the data signal. When a LOS is detected, the output of this circuit
can be used to shut down both the output pulse (IP) current and DC bias current (IB). The LOSTest pin provides a means to simulate a LOS
condition for testing.
Rev. 2d, 10/26/00.
The information provided in this Data Sheet is PRELIMINARY and is subject to change without notice.
Conexant Proprietary and Confidential
Pg. 2 of 14


Features Network Access Division Data Sheet CX6 0077 2.5 Gbps Long Haul Laser Driver K ey Features • • • • • • • • Single supply : -5.2 Volts CML int erface (with capability of receiving EC L level) Low power consumption ≤ 400 mW Input impedance of 50 Ω Loss of in put data detection Pulse and bias curre nt monitors 1 to 80 mA laser diode bias current 5 to 80 mA pulse current range Applications • • Fiber-optic comm unication systems (OC-48) SONET/SDH tes t equipment Product Description The C X60077 is a high-speed laser driver des igned for use in a transmitter module f or fiber-optic communications, such as Synchronous Optical Network (SONET), Sy nchronous Digital Hierarchy (SDH), Asyn chronous Transfer Mode (ATM), and Dense Wavelength Division Multiplexer (DWDM) . This device can achieve a maximum out put drive current of 80 mA into a 25 load. Figure 1 illustrates the functi onal block diagram, and Table 1 lists t erminal descriptions. The CX60077 is available in a 32-pin flat pack, which is illustrate.
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