LT1251 Linear Technology, LT1251 Datasheet - Page 21

• Manufacturer Part Number: LT1251
• Description: 40MHz Video Fader and DC Gain Controlled Amplifier
• Manufacturer: Linear Technology

W
*full scale amp
IBFS
RIFS
C12
R12
CBWFS
EFS
VOSFS
C11
RFS
C10
*
*generating K
*** the next two lines are for the LT1251
EK K 0 TABLE {I(VOSC)/I(VOSFS)}= (–100,0)
+
*** the next two lines are for the LT1256
*EK K 0 TABLE {I(VOSC)/I(VOSFS)}= (–100,0)
*+
RDUMMY
RNOISE1 EN
RNOISE2 EN
*generates 40.7nV/rtHz
*
*null circuit
GNULL
RN1
VNULL
RN2
C6
*
*output stage
E6
+VALUE={1.8MEG*(I(VOS1)*V(K)+I(VOS2)*(1–V(K))–I(VNULL)+0.10UA+0.0007*V(EN))}
RG
CG
E8
V8
R8
*
*output swing and current limit
DP
VDP
DN
VDN
.MODEL
GCL
*
*supply current
GQ
GCC
GEE
*
.ENDS LT1251
ACRO ODEL
12A
12B
12B
12
12
12
12
11
11
10
6A
6A
6B
8A
8A
8B
8C
8C
8D
8B
8P
8N
8N
D1
8B
K
7
6
9
9
7
W
12A
11
10
6A
6B
8B
8D
8P
8B
0
0
0
0
0
0
0
0
0
0
7
6
7
0
0
0
8
9
7
D
0
7
0
0
–300NA
100MEG
1PF
1600
10PF
12A
–5MV
1PF
5K
1PF
1MEG
200K
200K
VALUE={I(VOSFS)}
200
0.0V
400
1PF
1.8MEG
3.4PF
8B
0.0V
11
D1
–1.4V
D1
1.4V
TABLE {I(V8)}=(–1,–1)(–0.04,0)(0.04,0)(1,1)
VALUE={1MA+24*I(VOSFS)+(V(7)–V(9))/20K}
TABLE {I(V8)}=(–1,0)(0,0)(1,1)
TABLE {I(V8)}=(–1,–1)(0,0)(1,0)
0
0
(0.9,0.907) (0.95,1.0) (100,1.0)
(0.9,0.9)
1.0
1.0
(0.04,0)
(0,0)
(1.0,1.0)
(0.1,0.11)
(0.2,0.21)
(100,1.0)
LT1251/LT1256
21