sy88232l Micrel Semiconductor, sy88232l Datasheet - Page 15

• Manufacturer Part Number: sy88232l
• Description: 2.5gbps Laser Diode Driver With Integrated Limiting Amplifier
• Manufacturer: Micrel Semiconductor

Loss-of-Signal-Level Set
A programmable LOS/SD level set pin (LOS
threshold of the input amplitude detection. Connecting
an external resistor between V
voltage at LOS
V
between V
Hysteresis
The post amplifier provides typically 3dB LOS electrical
hysteresis, which is defined as 20log (VIN
VIN
voltage out of the ROSA to optical power at its input is
linear, the optical hysteresis will be typically half of the
electrical hysteresis reported in the datasheet, but in
practice the ratio between electrical and optical
hysteresis is found to be within the range 1.5 to 1.8.
Thus, 3dB electrical hysteresis will correspond to an
optical hysteresis within the range 1.6dB to 2dB.
Micrel, Inc.
June 2009
CC
LOS-De-Assert
-1.3V. The external resistor creates a voltage divider
CC
and V
). Since the relationship between the
LVL
. This voltage ranges from V
CC
-1.3V, as shown in Figure 2c.
CC
and LOS
LVL
LVL
LOS-Assert
) sets the
sets the
CC
to
/
15
RSSI Pin
The post amplifier has an RSSI (Received Signal
Strength) pin, which provides a current proportional to
the amplitude of the signal at the input of the post
amplifier from the ROSA. Install a resistor between this
pin and GND to convert the current into a monitoring
voltage proportional to the amplitude of the signal at the
input of the post amplifier. The value of the resistor
should be selected to keep the voltage at the RSSI pin
under its limit of 1.2V to maintain RSSI linearity.
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SY88232L/AL