Datasheet

20
LT1251/LT1256
ACRO ODEL
WW
For PSpice
TM
*
* Linear Technology LT1251/LT1256 VIDEO FADER MACROMODEL
* Written: 3-11-1994 BY WILLIAM H. GROSS.
* Corrected: 7-15-1996
* Connections: as per datasheet pinout
*1=first noninverting input
*2=first inverting input
*3=control voltage input
*4=control current input
*5=control resistor, RC
*6=null input
*7=negative supply
*8=output
*9=positive supply
*10=full scale resistor, RFS
*11=full scale current input
*12=full scale voltage input
*13=second inverting input
*14=second noninverting input
*
.SUBCKT LT1251 1 2 3 4 5 6 7 8 9 10 11 12 13 14
*
*first input stage
IB1 1 0 500NA
RI1 1 0 17MEG
C1 1 0 1.5PF
E1 2A 0 VALUE={LIMIT (V(1), V(8N)+0.4, V(8P)–0.4)+V(EN)/30}
VOS1 2A 2B 2.5MV
R1 2B 2 27
C2 2 0 1PF
*
*second input stage
IB2 14 0 450NA
RI2 14 0 17MEG
C14 14 0 1.5PF
E2 13A 0 VALUE={LIMIT (V(14), V(8N)+0.4, V(8P)–0.4)+V(EN)/30}
VOS2 13A 13B 1.5MV
R2 13B 13 27
C13 13 0 1PF
*
*control amp
IBC 3 0 –300NA
RIC 3 0 100MEG
C3 3 0 1PF
R3 3 3A 1600
CBWC 3A 0 10PF
EC 3B 0 3A 0 1.0
VOSC 3B 4 5MV
C4 4 0 1PF
RC 4 5 5K
C5 5 0 1PF
*
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