LT1251/LT1256
W
W
ACRO ODEL
For PSpiceTM
*
* 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
RI1
C1
1
1
1
0
0
0
500NA
17MEG
1.5PF
E1
VOS1
R1
2A
2A
2B
2
0
2B
2
VALUE={LIMIT (V(1), V(8N)+0.4, V(8P)–0.4)+V(EN)/30}
2.5MV
27
C2
0
1PF
*
*second input stage
IB2
RI2
C14
E2
14
14
14
13A
13A
13B
13
0
0
0
450NA
17MEG
1.5PF
0
VALUE={LIMIT (V(14), V(8N)+0.4, V(8P)–0.4)+V(EN)/30}
1.5MV
27
VOS2
R2
13B
13
0
C13
*
1PF
*control amp
IBC
RIC
C3
3
3
3
0
0
0
–300NA
100MEG
1PF
R3
CBWC
EC
VOSC
C4
RC
3
3A
0
0
4
0
1600
10PF
3A
5MV
1PF
5K
3A
3B
3B
4
0
1.0
4
5
C5
5
0
1PF
*
PSpice is a trademark of MicroSim Corporation
20
Linear [ Linear ]
