sy84782u Micrel Semiconductor, sy84782u Datasheet - Page 3

• Manufacturer Part Number: sy84782u
• Description: Low Power 2.5v 1.25gbps Fp/dfb Laser Diode Driver
• Manufacturer: Micrel Semiconductor

Pin Description
Truth Table
Notes:
1. I
2. Assuming that Laser is tied to MOD+
Micrel, Inc.
January 2011
MOD
Pin Number
1, 4, 7, 8, 13
= 0 when MOD+ = H
11, 12
9, 10
5, 6
DIN+
14
15
16
2
3
H
X
L
Exposed Pad
Pin Name
IM_SET
MOD+
MOD-
VREF
GND,
DIN+
VCC
DIN-
/EN
DIN-
H
L
X
Pin Function
Device Ground. Ground and exposed pad must be connected to the plane of the most
negative potential.
Non-Inverting Input Data. Internally terminated with 50Ohm to a reference voltage
Inverting Input Data. Internally terminated with 50Ohm to a reference voltage
Supply Voltage. Bypass with a 0.1uF || 0.01uF low ESR capacitor as close to VCC pin as
possible.
Inverted Modulation Current Output. Provides modulation current when input data is
negative
Non-Inverted Modulation Current Output. Provides modulation current when input data is
positive.
Reference Voltage. Install a 0.1uF capacitor between VREF and VCC
Modulation current setting and control. The voltage applied to this pin will set the
modulation current. To be connected to the MIC3003 pin 24 (VMOD+). Input impedance
25KOhm.
Enable Pin. A high level signal applied to this pin will pull the MOD+ output HIGH and
MOD- output LOW. Internally pulled down with a 75KOhm resistor.
/EN
H
L
L
3
MOD+
H
H
L
(1)
[e-mail]
MOD-
H
L
L
Laser Output
or [phone]
M9999-012411-A
SY84782U
H
L
L
(2)