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SY88216LMG Datasheet(PDF) 3 Page - Micrel Semiconductor

Part # SY88216LMG
Description  3.3V, 2.5Gbps Burst Mode Laser Driver
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

SY88216LMG Datasheet(HTML) 3 Page - Micrel Semiconductor

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Micrel, Inc.
SY88216L
April 2008
3
M9999-040908-B
hbwhelp@micrel.com or (408) 955-1690
Pin Description
Pin Number
Pin Name
Pin Function
2
DIN+
Non-inverting input data. Internally terminated with 50
Ω to a reference voltage.
3
DIN-
Inverting input data. Internally terminated with 50
Ω to a reference voltage.
5
BEN+
Non-inverting burst enable. Accepts any input, single-ended or differential: TTL/CMOS,
LVPECL, CML, LVDS, HSTL, and SSTL. BEN requires an external termination. See Figure 2.
6
BEN-
Inverting burst enable. Accepts any input, single-ended or differential: TTL/CMOS, LVPECL,
CML, LVDS, HSTL, and SSTL. BEN requires an external termination. See Figure 2.
7
/EN
Active low TTL/CMOS. Internally pulled-up. Pull-down with a 22k
Ω or lower resistance or
apply a low level signal (<0.8 V) to enable bias and modulation. Keep floating or apply a high
level (>2 V) to disable.
9
OSC
Internal oscillator setting option. Install a 0
Ω resistor from this pin to VCC or leave it open to
set the frequency. Refer to the frequency table.
10
/APCFAULT
Indicates APC failure when low. Active low TTL/CMOS.
12
PWRMON
Power Monitor. Provides a current which is proportional to the sum of bias current and half of
modulation current. Install a resistor between this pin and GND to convert that current to a
voltage.
13
BIAS-
Inverting laser bias current output. Pull-up to VCC with a resistor.
14
BIAS+
Non-inverting laser bias current output, sources current when BEN is high. Connect to the
cathode of the laser through a resistor.
16
MOD+
Non-inverted modulation current output. Provides modulation current when input data is
positive.
17
MOD-
Inverted modulation current output. Provides modulation current when input data is negative.
20
MD
Input from the laser monitoring photodiode. Connect to the anode of the photodiode for APC
operation.
22
BIASMAX
Install a resistor between this pin and GND to set the maximum bias current for the closed
loop operation. The APC loop controls the bias current up to the level of BIASMAX. When the
bias current reaches the maximum value set through this pin, the driver continues to sink a
current equal to this maximum. For open loop operations, this pin sets the bias current.
23
MODSET
Modulation current setting and control. The modulation current is set by installing an external
resistor from this pin-to-ground or using a current source.
24
APCSET
Bias current setting and control. The bias current is set by installing an external resistor from
this pin to ground or using a current source. Connect a 50K resistor-to-GND for open loop
operation.
8, 11,19
GND
Ground. Ground and exposed pad must be connected to the plane of the most negative
potential.
1, 4, 15, 18, 21
VCC
Supply Voltage. Bypass with a 0.1µF//0.01µF low ESR capacitor as close to VCC pin as
possible.
Truth Table
DIN+
DIN-
/EN
MOD+
(1)
MOD-
Laser
Output
(2)
L
H
L
H
L
L
H
L
L
L
H
H
X
X
H
H
L
L
Oscillator Frequency
OSC
Frequency (MHz)
Open
25
VCC
50
Notes:
1.
IMOD = 0 when MOD+ = H.
2.
Assuming that the laser is tied to MOD+.


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