? 1995 burr-brown corporation li-471a printed in u.s.a. june, 1995 international airport industrial park ? mailing address: po box 11400 ? tucson, az 85734 ? street address: 6730 s. tucson blvd. ? tucson, az 85706 tel: (520) 746-1111 ? twx: 910-952-1111 ? cable: bbrcorp ? telex: 066-6491 ? fax: (520) 889-1510 ? immediate product info: (800) 548-6132 dem-opa65x dem-opa265x evaluation fixtures features l boards for single and dual op amps l soic and dip versions l surface mount components for optimum performance l sma input and output jacks for maximum frequency response l universal power supply connection applications l easy evaluation of cfa and vfa op amps l easy evaluation of single and dual op amps l evaluate high-frequency, two-layer pcb layout description the dem-opa65x and dem-opa265x evaluation fixtures are pre-assembled printed circuit boards de- signed to provide an optimized environment when evaluating the wideband operational amplifiers of the opa65x series. the dem-opa65x is used for the single op amps, where the dem-opa265x is designed for dual op amps. a variety of different op amps can be evaluated with the same board. for example the voltage-feedback op amp opa650/opa651 or the current-feedback op amp opa658. similarly for the duals, the opa2650 or the opa2658 will fit on the dem-opa265x demonstration board. since the boards are universal, the actual operational amplifier is not included with the evaluation board. boards are avail- able for both package types, the dip and the soic package. these demonstration boards have surface-mount resis- tors and ceramic bypass capacitors soldered on the board. a collection of gain setting resistors is included with the board. the feedback resistor is placed directly between the input and the output pins. this is neces- sary to achieve the maximum bandwidth. the power supply bypass capacitors consist of a tantalum and a ceramic chip capacitor pair on each of the power supplies. they are placed directly at the pins to main- tain low harmonic distortion. for more detailed infor- mation on the operational amplifiers, refer to the individual datasheets. the demoboards have been designed to support a variety of different circuit configurations. also in- cluded are resistors for termination and isolation of load capacitance. slight degradation of the ac-perfor- mance is the tradeoff. however, the number of re- quired components depends on the selected configura- tion.
dem-opa65x/opa265x 2 ordering information part number package circuit configuration dem-opa65xp dip single op amp dem-opa65xu soic single op amp dem-opa265xp dip dual op amp dem-opa265xu soic dual op amp (c) (d) (a) (b) figure 1. circuit diagram of the dem-opa65x. figure 2. dem-opa65xp, (a) silkscreen/bottom, (b) silkscreen/top, (c) solder side, (d) component side. r 6
r 1 out 6 j 1 1 2 gnd ?v p2 r 7 r 5
+in r 3 r 4 r 2
?n j 1 j 2 2 4 7 3 r 8
c 2
0.1? c 6 c 4
1? opa65x 1 2 +5v gnd p1 c 1
1? c 3
0.1?
3 dem-opa65x/opa265x figure 3. dem-opa65xu, component side, solder side and silkscreen. figure 4. circuit diagram dem-opa265x. r 6
r 1 out a j 1 1 2 gnd ?v p2 1 2 +5v gnd p1 r 7 r 5
+in a r 3 r 4 r 2
r 15
r 16
?n a j 3 j 2 2 4 1 3 c 2
0.1? c 4
2.2? r 9
r 14 opa265x opa265x out b j 6 r 10 r 8
+in b r 12 r 13
r 11
?n b j 4 j 5 6 8 7 5 c 3
2.2? c 1
0.1? 1/2 1/2 c 6 c 5
dem-opa65x/opa265x 4 (a) (b) (d) (c) figure 5. dem-opa265xp: (a) silkscreen/bottom, (b) silkscreen/top, (c) solder side, (d) component side. figure 6. dem-opa265xu, component side, solder side and silkscreen.
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