DC2414A

DC2414A demonstration circuit supports 3 ch of LTC6268 & LTC6268-10/LTC6226X. This demonstration circuit 2414A has layouts for three channels of SOT-23 transimpedance amplifiers. Each of the three layouts applies different techniques achieving various parasitic feedback capacitances (CF). The upper channel, U3, assumes a low transimpedance gain, has a parasitic CF of 0.1pF and provides a footprint for an additional component CF in an 0402 footprint (C29). The lower channel, U1, assumes high transimpedance gain and was laid out to minimize CF, achieving approximately 7fF, although real situation is more complex. The middle channel, U2, assumes a middle case. The outputs of the circuit are laid out for SMA edge connectors. The inputs consist of six pads per channel along the edge where a through-hole photodiode can be mounted, with provision for any photodiode pinout. The reverse bias voltage for the photodiode can be applied at VBB turret, or can be taken from V+/V- through jumper JP4.

• Un-populated demonstration circuit

Warnings

Take caution when working with high voltages to avoid contact with any part of the VBB trace. Because of the many possible varieties of population, the board is stocked as a bare unpopulated board.

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party.