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*TITLE=ZXCT1082 MACROMODEL
*ORIGIN=DZSL_AG_GS
*SIMULATOR=DIODES, SIMETRIX and PSPICE
*DATE=1st Sept 2011
*VERSION=2
*PIN_ORDER   1:OUT  2:GND, 3:S+, 4:S-, 5:VCC

*Does not include temperature dependence of offset error, gain or input current.
*Includes roughly approximated temperature effect of low voltage operating knee of VS- and VCC. 

.subckt ZXCT1082 OUT GND  S+  S- VCC
* pins------------1---2---3---4---5
      
.PARAM VTH1 = {1-0.004*(TEMP-25)}
.PARAM KG ={1e-4/(2-VTH1)**2} ; rnom/(VON-VTH1)^2
D1  S+ 1 DHM
D2  1  S- DHM
D3  S- 2 DHM
D4  2  S+ DHM
D7  GND VCC DHM
D8  GND S- DHM
D9  GND S+ DHM

*input current typ 1.7uA at Vcc=VS+=12V
G1  S+ GND value={(1.4u+((V(VCC)-V(GND)-4)/42e6)+((V(S+)-V(GND))/6e8))
+ *0.25*(1+tanh(10*(V(VCC)-V(GND)-3.5)))*(1+tanh(20*(V(S+)-V(GND)-1)))}
G2  S- GND value={(1.4u+((V(VCC)-V(GND)-4)/42e6)+((V(S+)-V(GND))/6e8))
+ *0.25*(1+tanh(10*(V(VCC)-V(GND)-3.5)))*(1+tanh(20*(V(S+)-V(GND)-1)))}
R1  S+ FILT 10k      ;input filter
C1  FILT S- 1pf       ;input filter 
R2  VCC GND  3.75Meg   ;Vcc quiescent current, typ 16uA at 60V
G3  S- SIN VALUE={0.1*((1+tanh(10*(V(S-)-V(FILT))))*tanh(50*max(V(S-)-V(SIN),0))
+ +(-1+tanh(10*(V(S-)-V(FILT))))*tanh(50*max(V(SIN)-V(GND),0)))
+ *tanh(20*max(V(VCC)-VTH1,0))}
C5  S- GND 3p
C6  S+ GND 2p
C4  SIN FILT 100f
R3  S+ SIN 1G
C2  SIN S+ 500f
R6  S+ S+A 1k
G4  S+A OUT VALUE={KG*(max(V(S+A)-V(SIN)-VTH1,0)**2)*(V(S+A)-V(OUT))}
R4  S+ OUT 8G
C3  SIN OUT 80f
C7  OUT GND 1.25p
* zener diode
D5  SIN S+ DHM
D6  S+  Z1 DHM
I1  SIN Z1 0.192
RZ  Z1 SIN 100

.model DHM D IS=6.3E-16 BV=65
.ends ZXCT1082
*
*                (c)  2011 Diodes Incorporated
*
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*   and may be used or copied intact  (including this notice)  for
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*
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