EL6211 Datasheet, PDF (1/2 Pages) Intersil Corporation – 3-Channel Laser Diode Driver + Oscillator

®
Data Sheet
June 14, 2004
EL6211
FN7222
3-Channel Laser Diode Driver + Oscillator
The EL6211 is a three-channel laser
diode current amplifier that provides
controlled current to a grounded laser
diode. Channels 2 and 3 should be used as the write
channels, with switching speeds of less than two
nanoseconds rise/fall time. All three channels are summed
together at the I_OUT output, allowing the user to create
multilevel waveforms in order to optimize laser diode
performance. The level of the output current is set by an
analog voltage applied to an external resistor which converts
the voltage into a current at the I_IN pin (virtually ground).
An on-chip 500MHz oscillator is provided to allow output
current modulation when in any mode. This is turned on
when the OSCEN pin is held high. Complete control of
amplitude and frequency is set by two external resistors
connected to ground at pins R_FREQ and R_AMP (see graphs
in this data sheet for further explanation).
Output current pulses are enabled when an ‘L’ signal is
applied to the OUTEN pin. No output current flows when
OUTEN is ‘H’, and additional laser diode protection is
provided since the OUTEN input will float high when open.
Complete I_OUT shutoff is also achieved by holding the
ENABLE pin low, which will override the OUTEN control
pins.
The external resistors allow the user to accurately and
independently set each amplifier transconductance by
applying a voltage to each resistor, without restriction on the
voltage range, thus ensuring broad voltage DAC
compatibility. Alternatively, the I_IN pin can be biased from a
current DAC or other current source.
Ordering Information
PART
NUMBER
PACKAGE TAPE & REEL PKG. DWG. #
EL6211CU
16-Pin QSOP
-
MDP0040
EL6211CU-T7 16-Pin QSOP
7”
MDP0040
EL6211CU-T13 16-Pin QSOP
13”
MDP0040
Features
• “Shrink-Small” outline package
• Voltage-controlled output current source requiring one
external set resistor per channel
• Current-controlled output current source
• Rise time = 1.6ns
• Fall time = 1.9ns
• On chip oscillator with frequency and amplitude control by
use of external resistors to ground
• Oscillator to 500MHz
• Oscillator to 100mA_PK/PK
• Single +5V supply (±10%)
• Disable feature for power-up protection and power savings
• CMOS control signals
Applications
• CD-RW applications
• Writable optical drives
• Laser diode current switching
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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