F0100505B Datasheet, PDF (11/12 Pages) Eudyna Devices Inc – 3.3 V /5V 2.5 Gb/s NRZ Receiver Transimpedance Amplifier

3.3 V / 5V 2.5 Gb/s Transimpedance Amplifier
♦ General Description
F0100505B
A transimpedance amplifier is applied as a pre-amplifier which is an amplifier for a faint
photo-current from a PIN photo diode (PD). The performance in terms of sensitivity, band-
width, and so on, obtained by this transimpedance amplifier strongly depend on the capaci-
tance brought at the input terminal; therefore, “typical”, “minimum”, or “maximum” parameter
descriptions can not always be achieved according to the employed PD and package, the
assembling design, and other technical experts. This is the major reason that there is no
product lineup of packaged transimpedance amplifiers.
Thus, for optimum performance of the transimpedance amplifier, it is essential for cus-
tomers to design the input capacitance carefully.
Hardness to electro-magnetic interference and fluctuation of a power supply voltage is
also an important point of the design, because very faint photo-current flows into the
transimpedance amplifier. Therefore, in the assembly design of the interconnection be-
tween a PD and a transimpedance, noise should be taken into consideration.
♦ Recommendation
SEI basically recommends the F08 series PINAMP modules for customers of the
transimpedance amplifiers. In this module, a transimpedance amplifier, a PD, and a noise
filter circuit are mounted on a TO-18-can package hermetically sealed by a lens cap, having
typically a fiber pigtail. The F08 series lineups are the best choice for customers to using the
F01 series transimpedance amplifiers. SEI’s F08 series allows the customers to resolve
troublesome design issues and to shorten the development lead time.
♦ Noise Performance
The F0100505B based on GaAs FET’s shows excellent low-noise characteristics com-
pared with IC’s based on the silicon bipolar process. Many transmission systems often
demand superior signal-to-noise ratio, that is, high sensitivity; the F0100505B is the best
choice for such applications.
The differential circuit configuration in the output enable a complete differential operation
to reduce common mode noise: simple single ended output operation is also available.