400 Hot Springs Road, Carson City NV 89706 (775) 883-0820 Fax (775) 883-0827 www.hytek.com 21
HY6210
Laser Diode Driver
TEC
Controllers
Laser
Diode
Drivers
Micro-heaters
High Speed Laser Diode Driver
The HY6210 Laser Diode Driver
is a high speed,
high current solid-state hybrid laser diode driver. It incorpo-
rates a patented technique of "backmatching" which allows
remote drive of the laser diode through a 50
coaxial trans-
mission line. This technique allows physical and thermal
isolation of the laser diode and the driver. The laser diode
can be driven through a transmission line without the need
for a matched impedance termination. This removes a large
source of heat that can be detrimental to high performance
laser diode systems.
The HY6210 is used in applications that require digi-
tal, high speed, current modulation of the laser diode. The
HY6210 input is ECL compatible and is terminated into
50
. The HY6210 uses a GaAsFET current switch that
drives a laser diode with modulation currents of up to
200mA peak-to-peak. Two programmable current sources
allow user selectability of the bias and modulation currents.
The pre-bias current is selectable from zero to 40mA. The
Modulation current is selectable from zero to 200mA. These
selected currents modulate the laser beam at the input fre-
quency. The HY6210 comes in a 22 pin dual in-line ceramic
package. This package is not hermetically sealed and pro-
vides a cost effective alternative to the hermetic package of
the HY6110 driver. An aluminum heat spreader is included
as part of the package for heat sinking the device.
Features:
Single ended ECL input (50
)
Data rates up to 622Mbps
Programmable bias current
Adjustable modulation current
Patented "backmatching" thermal management
Backmatched output allows remote drive
through 50
line
Figure 2
Figure 1
22 400 Hot Springs Road, Carson City NV 89706 (775) 883-0820 Fax (775) 883-0827 www.hytek.com
HY6210
Laser Diode Driver
Pin Descriptions
> 5.2V INPUT:
Power supply input for ECL buffer circuitry.
> GROUND:
Ground return for 5.2V ECL supply and V.
> V:
Power Supply input for Bias and Modulation currents as well as laser diode drive circuitry.
> REF OUT:
Precision reference output, +5V with respect to V (if V is 12V, REF OUT would be 7V).
> BIAS
I
:
Input used to set the Bias current for the laser diode. Maximum bias current occurs when the voltage at
the BIAS
I
input is +2V with respect to the V input. The voltage at the BIAS
I
input for a given bias cur-
rent is determined by the equation: V(BIAS
I
) = V + (desired bias current) x 40
> MOD
I
:
Input used to set the Modulation current for the laser diode. This current is added to the Bias
I
current
which always flows through the laser diode. Maximum modulation current occurs when the voltage at the
MOD
I
input is +0.5V with respect to the V input. The current set by the MOD
I
voltage is controlled by
the ECL RF input. When the RF input is open or set to an ECL "low" input, only BIAS
I
current flows
through the laser diode. The voltage at the MOD
I
input for a given modulation current is determined by
the equation: V(MOD
I
) = V + (desired modulation current) x 2.5
> RF IN:
The input is terminated with an equivalent 50
into 2V required by the ECL logic family. This input ac-
cepts data rates up to 600Mbps.
> RF OUT:
The patented "backmatching" technique does not require a 50
termination at the laser diode end of the
transmission line.
Input Specifications
Power Inputs
5.2V Supply
4.9V to 5.5V @ 115mA max.
12V Supply (V)
9V to 12V @ 220mA max.
RF IN
ECL logic levels, 0622Mbps
BIAS
I
0 to 40mA for input voltage V to V + 2V
MOD
I
0 to 200mA for input voltage V to V + 0.5V
Output Specifications
RF OUT
Current output into 50
transmission line
Low Current = BIAS
I
, High Current = MOD
I
RF OUT Transmission Line Length
10 feet max.
REF OUT
V +5V
Environmental Conditions
Operating Temperature
55C to 100C (case)
Storage Temperature
65C to 150C
Pin Designations
Description
HY6210
5.2V input (5.2V)
Pin 10
Ground (GND)
Pins 9, 13, 21
V Input (V)
Pin 8
Reference Voltage Output (REF OUT)
Pin 6
Bias
I
Adjust (BIAS
I
)
Pin 5
Modulation
I
Adjust (MOD
I
)
Pin 4
ECL Input Waveform (RF IN)
Pin 12
Laser Diode Current Driver (RF OUT)
Pin 22
Model No. HY6210
Description: 200mA High Speed Laser Diode Driver;
ceramic package
Application: ECL Digital Modulation of Laser Diode
Ordering Information
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