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ONET4211LD Datasheet(PDF) 2 Page - Texas Instruments

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Part # ONET4211LD
Description  155 Mbps to 4.25 Gbps LASER DRIVER
Download  26 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ONET4211LD Datasheet(HTML) 2 Page - Texas Instruments

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DETAILED DESCRIPTION
BLOCK DIAGRAM
B0092-01
VCC
GND
DIN+
DIN-
MOD+
MOD-
MODSET
Current Modulator
OUTPOL
MODTC
BIAS
MONB
IBMAX
MONP
PD
APCSET
SDOWN
DISABLE
CAPC
FLTMODE
Input Buffer Stage
Modulation Current Generator
MODCTRL
MODSET
IMODEN
MODTC
IMODMON
Reference
Voltage
and Bias
Generation
VCC
GND
4
3
Bias Current Generator
BIAS
IBMAX
IBEN
IBMON
IBSET
MONB
Control
IMODEN
IMODMON
IBEN
IBMON
DISABLE
SDOWN
APCCTRL
APCMON
FLTMODE
Automatic Power Control
(APC)
IBSET
APCMON
APCCTRL
MONP
APCSET
PD
CAPC
ONET4211LD
SLLS688 – NOVEMBER 2005
These devices have limited built-in ESD protection. The leads should be shorted together or the device
placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
A simplified block diagram of the ONET4211LD is shown in Figure 1.
This compact, low-power, 4.25-Gbps laser driver circuit consists of a high-speed data path and a
bias-and-control block.
The function of the data path is to buffer the input data and then modulate the laser diode current according to
the input data stream.
The bias-and-control block generates the laser diode bias current, contains automatic power control (APC) to
maintain constant optical output power, generates a modulation current that can be temperature compensated,
and controls power on during start-up and shutdown after failure detection. The circuit design is optimized for
high-speed and low-voltage operation (3.3 V).
The main circuit blocks are described in detail in the following paragraphs.
Figure 1. Simplified Block Diagram of the ONET4211LD
2


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