EMY1441HL Eudyna Devices Inc, EMY1441HL Datasheet - Page 10

• Manufacturer Part Number: EMY1441HL
• Description: 11.3 Gb/s Direct Modulation Driver Ic For +3.3v Supplied Voltage
• Manufacturer: Eudyna Devices Inc

EMY1441HI Datasheet Rev1.1
9.1. Input RF Signal
IC thr ough 50ohm lines with DC block capacitor s. The IC oper ates with either differ ential or single-ended input
signal. For oper ation with single-ended input, the unused input pin should be connected to gr ound with a capacitor
for better stability in inter nally gener ated r efer ence voltage.
Figure 9-2 Schematic Diagram of Single-Ended Input Circuit
9.2. DM-LD Dr ive and Output Cir cuit
the IC should be used in the system. Anode pin of the DM-LD should be connected to V
r esistor and back-ter mination r esistor s in the IC. The RF signal line should be impedance-contr olled. Design for
complementar y signal ter mination is impor tant for good optical per for mance, as well as the signal line design for
DM-LD.
9.3. RF Signal Line Design
such as bends, land patter ns, via-holes, etc., in or der to minimize impedance discontinuity that may degr ade the
wavefor ms. It is r ecommended to make physically and electr ically symmetr ic design for differ ential RF signal line at
both input and output, as much as possible.
9.4. Bias De-coupling
mor e differ ent capacitor s (for example, r anging fr om some 10
obtain a good de-coupling over wide fr equency r ange.
Ther e ar e 50ohm ter mination r esistor s to gr ound on EMY1441HI die. The input RF signal must be fed into the
Schematic diagr am of the differ ential and single-ended input cir cuit is shown in Figur e 9-2.
It is r ecommended to connect DoutB fr om EMY1441HI to cathode pin of a DM-LD, when shutdown function of
When IBout ter minal is not used, IBout should be connected to V
Low loss mater ial for PCB must be used for good signal quality. Car eful designs must be taken for the layout,
It is r ecommended to have bypass capacitor s for power supply and DC contr ol voltage pins. Having two or
Differential Input
Din
DinB
EMY1441HI
- 10 -
Single-ended Input
-11
to 10
-6
TT
far ads) at each node will be effective to
thr ough load r esistor .
Din
DinB
TT
, together with Dout load
EMY1441HI
Eudyna Device Inc.
J anuary,2006
No:ECM-A00-218