Datasheet

22
LT1251/LT1256
LT1251/LT1256 Macro Model for PSpice
ACRO ODEL
WW
2B
PIN # IN NODE # IN
FIRST INPUT STAGE
OUTPUT STAGE AND VOLTAGE SWING/CURRENT LIMIT
1
2
1251/56 MM
2A
C1
1.5pF
RI
1
17M
V
OS1
R1
27Ω
I
B1
500nA
C2
1pF
E1
8A
8B
8P
D
P
D
N
8N
R
G

1.8M
C
G

3.4pF
E6
13B
SECOND INPUT STAGE
14
13
13A
C14
1.5pF
RI
2
17M
V
OS2
R2
27Ω
I
B2
450nA
C13
1pF
E2
7
G
EE
9
G
CC
9
7
G
Q
CONTROL AMP
3
5
4
3A 3B
C3
1pF
C
BWC

10pF
RI
C
100M
V
OSC
R
C

5k
R3
1.6k
I
BC
–300nA
C4
1pF
C5
1pF
E
C
FULL SCALE AMP
12
10
11
12A 12B
C12 
1pF
C
BWFS

10pF
RI
FS
100M
V
OSFS
R
FS

5k
R12
1.6k
I
BFS
–300nA
C11
1pF
C10
1pF
NULL CIRCUIT
E
FS
8
8C
8D
R8
11Ω
E8
V8
K GENERATOR 
K
R
DUMMY
1M
E
K
NOISE GENERATOR
EN
R
NOISE2
200k
R
NOISE1
200k
6B
6A
6
C6
1pF
R
N1
200Ω
R
N2

400Ω
G
NULL
V
NULL
7
SUPPLY CURRENTS
V
DP
V
DN
G
CL
9 7