On 11/1/07, Stefan Salewski <[EMAIL PROTECTED]> wrote: > Hello, > > I am still not sure how to BEST handle devices with internally connected > pins. I.e. THS4303 from TI. > > Positive power pins: 9,10,11,12 > Negative power pins: 1,2,3,4 > Output signal pins: 5,6,7,8 > > There are 4 possibilities: > > 1. Draw all pins in symbol > 2. Make separate symbol for power pins (and draw 4 output pins?) > 3. Use special footprint with has pads with identical numbers, so pins > are connected. > 4. Draw one visible pin in symbol for each signal, and use net attribute > like net=netTHS4303Vplus:9,10,11,12
I would draw the THS4303 as shown in the datasheet --- square enclosing an opamp with input and feedback resistors and one symbol pin for each physical pin. I would put Vs+ on the top, Vs- on the bottom, Vout on the right, Vin+ and Vin- on the left. I would probably put /PD and the NC either on either the bottom-left or the left-bottom. Generally for opamps (and analog components) I like to see the power pins on one of the slots. For logic devices I use separate power symbols. (* jcl *) -- http://www.luciani.org _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
