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FN2865 Rev 3.00 Page 1 of 7
January 2004
FN2865
Rev 3.00
January 2004
ICL8048
Log Amplifier
DATASHEET
The ICL8048 is a monolithic logarithmic amplifier capable of
handling six decades of current input, or three decades of
voltage input. It is fully temperature compensated and is
nominally designed to provide 1V of output for each decade
change of input. For increased flexibility, the scale factor,
reference current and offset voltage are externally
adjustable.
Pinout
ICL8048 (CERDIP)
TOP VIEW
Features
• Full Scale Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . 0.5%
• Temperature Compensated Operation . . . . . . 0
o
C to 70
o
C
• Scale Factor, Adjustable . . . . . . . . . . . . . . . . 1V/Decade
• Dynamic Current Range. . . . . . . . . . . . . . . . . . . . . 120dB
• Dynamic Voltage Range . . . . . . . . . . . . . . . . . . . . . 60dB
• Dual JFET Input Op Amps
Functional Diagram
ICL8048
Part Number Information
PART
NUMBER
ERROR
(25
o
C)
TEMPERATURE
RANGE (
o
C) PACKAGE
PKG.
NO.
ICL8048BCJE 30mV 0
to 70 16 Ld CERDIP F16.3
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
GND
I
IN
NC
V-
NC
A
1
OUTPUT
I
REF
NC
A
2
OFFSET
V+
V
OUT
NC
GAIN
NULL
A
2
OFFSET
NULL
A
1
OFFSET
NULL
A
1
OFFSET
NULL
V
REF
I
REF
16
7
15
2
V
IN
GND
A
1
OUTPUT
GAIN
Q
2
A
1
+
-
A
2
+
-
Q
1
1
f
IN
V
OUT
10
O
B
S
O
L
E
T
E
P
R
O
D
U
C
T
N
O
R
E
C
O
M
M
E
N
D
E
D
R
E
P
L
A
C
E
M
E
N
T
c
o
n
t
a
c
t
o
u
r
T
e
c
h
n
i
c
a
l
S
u
p
p
o
r
t
C
e
n
t
e
r
a
t
1
-
8
8
8
-
I
N
T
E
R
S
I
L
o
r
w
w
w
.
i
n
t
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