LF355AH National Semiconductor, LF355AH Datasheet - Page 11

• Manufacturer Part Number: LF355AH
• Description: Series Monolithic JFET Input Operational Amplifiers
• Manufacturer: National Semiconductor

Typical Applications
l
V
OUT
l
e
1
a
8-Bit D A Converter with Symmetrical Offset Binary Operation
R2
R
T
a
a
b
b
kT
q
0 040
9 920
9 920
0 040
E
(Continued)
O
ln V
i
V
B1 B2 B3 B4 B5 B6 B7 B8
REF Ri
1
1
0
0
R
r
1
0
1
0
Fast Logarithmic Converter
e
Precision Current Monitor
R1 R2 should be matched within
Full-scale response time 3 s
log V
1
0
1
0
i
R
1
i
I
r
1
0
1
0
R2
e
11
1
0
1
0
15 7k R
TL H 5646– 31
1
0
1
0
T
TL H 5646 – 21
e
1
0
1
0
1k 0 3% C (for temperature compensation)
g
1
0
1
0
0 05%
Negative Full-Scale
Positive Full-Scale
(
(
a
b
Comments
) Zero-Scale
) Zero-Scale
Dynamic range 100
ades)
Transient response 3 s for
C1 C2 R2 R3 added dynamic compensation
V
R
V
R1 R2 R3 0 1% resistors
Use LF155 for
X
X
X
X
OS
O
T
Common-mode range to supply range
Low I
Low V
Low Supply Current
e
Tel Labs type Q81
adjust the LF156 to minimize quiescent error
5 R1 R2 (V mA of I
l
B
V
OS
O
l
e
TL H 5646 – 32
1V decade
A
a
S
s
0 3% C
)
I
i s
I
i
e
1 mA (5 dec-
1 decade