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Old 20th May 2013, 12:53 AM   #1
popilin is offline popilin  Argentina
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Default LM329 LTSpice model needed

Hi all

A couple of days I search unsuccessfully.

If anyone has it, thanks in advance.
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Old 20th May 2013, 01:34 AM   #2
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There's a partial schematic on page 3 of the data-sheet -- it'll get you 90% of the way there if you create a sub-ckt from it.
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Old 20th May 2013, 02:07 PM   #3
popilin is offline popilin  Argentina
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Thanks for the suggestion, I'll try.
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Old 20th May 2013, 02:15 PM   #4
jcx is online now jcx  United States
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what properties matter in your circuit?

I'd just use a DC Vsource and maybe series R, L for 99% of apps

unless you are switching it on/off in circuit operation, or are (avoidably) shunting directly with too high Q a C...

Last edited by jcx; 20th May 2013 at 02:20 PM.
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Old 20th May 2013, 02:18 PM   #5
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Here's one such example:

************************************************** ***********************
***** LM329 DZ Model adapted from National Semi Schematic *************
***** July 8, 2005 ************************************************** **
***** Anode = 1 Kathode = 2 ******************************************
.subckt LM329DZ 1 2
Q10 2 2 3 N1
R1 2 3 50
C1 3 4 15pF
R2 4 6 2k
Q11 3 6 1 N1
R3 5 1 30k
Q12 6 7 3 P1
Q13 7 8 1 N1
C2 7 8 30pF
R4 8 9 10k
R5 9 1 2k
D1 9 2 DZ
R6 2 10 1k
Q14 7 11 10 P1
Q15 11 11 2 P1
Q16 11 9 13 N1
R7 13 1 2.6k
.MODEL DZ D (RS= 0.5164 CJO= 14e-012 BV= 6.2 IBV= 5e-4 TNOM= 27)
.model p1 pnp bf=50
.model n1 npn bf=100 tf=2n cjc=1p is=5e-18 NF=1.07
.ends
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Old 20th May 2013, 02:32 PM   #6
popilin is offline popilin  Argentina
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Quote:
Originally Posted by jcx View Post
what properties matter in your circuit?
I'm focusing on noise simulations, I would use lithium battery, but I do a soft start and a capacitor in parallel is not a good idea

Quote:
Originally Posted by jackinnj View Post
Here's one such example:

************************************************** ***********************
***** LM329 DZ Model adapted from National Semi Schematic *************
***** July 8, 2005 ************************************************** **
***** Anode = 1 Kathode = 2 ******************************************
.subckt LM329DZ 1 2
Q10 2 2 3 N1
R1 2 3 50
C1 3 4 15pF
R2 4 6 2k
Q11 3 6 1 N1
R3 5 1 30k
Q12 6 7 3 P1
Q13 7 8 1 N1
C2 7 8 30pF
R4 8 9 10k
R5 9 1 2k
D1 9 2 DZ
R6 2 10 1k
Q14 7 11 10 P1
Q15 11 11 2 P1
Q16 11 9 13 N1
R7 13 1 2.6k
.MODEL DZ D (RS= 0.5164 CJO= 14e-012 BV= 6.2 IBV= 5e-4 TNOM= 27)
.model p1 pnp bf=50
.model n1 npn bf=100 tf=2n cjc=1p is=5e-18 NF=1.07
.ends
Wow !

Thanks a lot !
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Old 20th May 2013, 02:44 PM   #7
jcx is online now jcx  United States
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I never use spice noise modeling - after getting a sim fully working in .TRAN I may check sensitivities with .AC - and apply those numbers to actual datasheet noise plots if needed

mostly I just use back of the envelope calcs and the datasheets - and I have designed electronic device noise limited interfaces for many types of transducers professionally - never looked like spice .noise analysis could help - really limited by the real part performance and the system noise from layout, ps, gnds...
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Old 20th May 2013, 02:56 PM   #8
popilin is offline popilin  Argentina
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Strongly agree.
Never able to make a decent noise simulation, it seems to me that mathematical models are incomplete in that issue.
Me too I deal with .tran and .ac

However, my knowledge is pretty limited, almost as much as my instruments.
Simulations are my walking stick.

Thanks for your reply.
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Old 21st May 2013, 07:25 PM   #9
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Just a LP filter and your noise problem is solved. Noise under 1 uV.
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Old 21st May 2013, 08:52 PM   #10
popilin is offline popilin  Argentina
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Thanks for your reply.

I need noise density around 1nV/sqrHz because it is amplified by an Op Amp, a LP RC filter seems to work, but with low R (thermal noise) I need very high C, but don't care, everything for the sound.
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