SM73302

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SNOSB93A – AUGUST 2011 – REVISED APRIL 2013

Figure 58. LMP7715 Response Gain = +1

With no increase in power consumption the decompensated op amp offers faster speed than the compensated

yet small enough to minimize the effects from the parasitic capacitance of both the PCB and the op amp.

Note: When using the SM73302, proper high frequency PCB layout must be followed. The GBW of these parts is

88 MHz, making the PCB layout significantly more critical than when using the compensated counterparts which

have a GBW of 17 MHz.

TRANSIMPEDANCE AMPLIFIER

An excellent application for the SM73302 is as a transimpedance amplifier. With a GBW product of 88 MHz this

part is ideal for high speed data transmission by light. The circuit shown on the front page of the datasheet is the

the part, thus the direction of the diode is reversed from the circuit shown on the front page.

Very high speed components were used in testing to check the limits of the SM73302 in a transimpedance

configuration. The photodiode part number is PIN-HR040 from OSI Optoelectronics. The diode capacitance for

laser diode was used for the light source. Laser diodes have on and off times under 5 nsec. The speed of the

selected optical components allowed an accurate evaluation of the SM73302 as a transimpedance amplifier. An

evaluation board for decompensated op amps, PN 551013271-001 A, was used and only minor modifications

were necessary and no traces had to be cut.

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Product Folder Links: SM73302