where to download lf198 device.

[roel1234]

does anyone knows how to and where to download a lf198???
its not in the database???
I would like to simulate and use it in ultiboard... can anyone...

[kittmaster]

Go to nationals website and see if they have the spice model there. If not, search google.

If you do find the model, then you'll have to create a custom component using the componet wizard, and then plug in the model data to finish the task.

Good luck

[roel1234]

wat are you refering to??
spice model???
i have search it and its all pdf...
help me i dont know wat im searching for...

[lacy]

Unfortunatly I have researched this IC and can't find a spice model for it. This happens sometimes. The only suggestion I can make is to take the PDF and try and create your own model for it. This can be a laborious task, but sometimes it is the only option. If you need help on creating a componet then there are some really good reference material in the NI Developers Zone.

[kittmaster]

You must not understand how simulation works, a spice model is a set of defined rules of subcircuits that tell the computer how to interpret the data present on the pins of the device.

Since your referring to a sample and hold chip that means there has to be some analog to digital convert and logic control to do the job the chip is designed to do. The PDF is datasheet information for the user to hook up the part. A spice model would look like the following:



* EWB Version 4 - 5 Terminal Opamp Model
* nodes: 3=+ 2=- 1=out 5=V+ 4=V-
* VCC= 15 VEE= -15 CC= 3e-011 A= 200000 RI= 2e+006
* RO= 75 VOS= 0.001 IOS= 2e-008 IBS= 8e-008
* VSW+= 14 VSW-= -14 CMMR= 90
* ISC= 0.025 SR= 0.5 Fu= 1e+006 Pm= 6.09112e-007
VC 5 15 DC 1.68573V
VE 12 4 DC 1.68573V
IEE 10 4 DC 1.516e-005A
R1 10 0 10Gohm
R6 11 0 100Kohm
R7 5 4 1Kohm
Rc1 6 5 5305.16ohm
Rc2 5 7 5305.16ohm
Re1 9 10 1839.19ohm
Re2 8 10 1839.19ohm
Ro1 1 14 37.5ohm
Ro2 14 0 37.5ohm
Ree 10 0 1.31926e+007ohm
Rcc 0 13 2.20906e-005ohm
Cee 0 10 1e-012
Cc 14 11 3e-011
C1 6 7 1e-016
GA 11 0 6 7 0.000188496
GC 0 13 1 0 45268.1
GB 14 0 11 0 282.942
GCM 0 11 10 0 5.96075e-009
D1 14 13 Dopamp1
D2 13 14 Dopamp1
D3 1 15 Dopamp2
D4 12 1 Dopamp2
Qt1 6 2 9 Qopamp1
Qt2 7 3 8 Qopamp2
.MODEL Dopamp1 D (Is=7.53769e-014A Rs=0 Cjo=0F Vj=750mV Tt=0s M=0)
.MODEL Dopamp2 D (Is=8e-016A Rs=0 Cjo=0F Vj=750mV Tt=0s M=0)
.MODEL Qopamp1 NPN (Is=8e-016A BF=83.3333 BR=960m
+ Rb=0ohm Re=0ohm Rc=0ohm Cjs=0F Cje=0F Cjc=0F
+ Vje=750m Vjc=750m Tf=0 Tr=0 mje=0 mjc=0 VA=50)
.MODEL Qopamp2 NPN (Is=8.30948e-016A BF=107.143 BR=960m
+ Rb=0ohm Re=0ohm Rc=0ohm Cjs=0F Cje=0F Cjc=0F
+ Vje=750m Vjc=750m Tf=0 Tr=0 mje=0 mjc=0 VA=50)




That is what your looking for.

So the short answer is that there is no way to simulate the chip your looking for......sorry ......and good luck

[lacy]

Chris explains the difference between a PDF and a Model file extremely well. Usually there is an internal diagram within the PDF File. Sometimes you can use this internal diagram to create a schematic within Multisim. From this schematic that you create you can make your own model file from it. This is the hard way of making a model file and sometimes it works and sometimes it doesn't. It all depends as to whether you can create the schematic form the diagram and sometimes that isn't possible due to lack of information within that diagram.

The best thing is to have a already made model to plug into Multisim, but again that isn't always possible either because there are components that just don't have models available for them.

I am sorry to say that your IC is one of those that I cannot find a spice model file for. Your only options would be to create one for yourself or hope that maybe someone already has done this and will share it with you.

I wish I could assit further, but this is about all I can tell you.

[roel1234]

it seems im stuck with it!!! tnx for your sugestions. i apprec8 it a lot.

according to your comment the ff are generated

option 1  creating the model( which is very very very hard)
option 2 wait for a big hearted person to share me his own model(which is ones in a blue moon)
option 3 buy the ic and simulate in real world(which is very expensive because the probability to destroy the ic is high)

the bottom line is you all helped me!!!
so again " maraming salamat po" ( means "thank you all" in pilipino  language)