Datasheet

MAX4207
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
4 _______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= +5V, V
EE
= -5V, GND = 0V, I
REF
= 1µA, I
LOG
= 10µA, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, R
SET
> 1MΩ,
T
A
= +25°C, unless otherwise noted.)
V
LOGV1
vs. I
LOG
MAX4207 toc01
I
LOG
(A)
V
LOGV1
(V)
1m
100µ10n 100n
10µ
1µ
-1.00
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
-1.25
1n 10m
T
A
= -40°C TO +85°C
1m100µ10n 100n 1µ 10µ1n 10m
V
LOGV1
vs. I
REF
MAX4207 toc03
I
REF
(A)
V
LOGV1
(V)
-0.50
-0.25
0
0.25
0.50
0.75
1.00
1.25
-0.75
I
LOG
= 1µA
T
A
= -40°C TO +85°C
V
LOGV1
vs. I
LOG
MAX4207 toc04
I
LOG
(A)
V
LOGV1
(V)
1m
100µ10n 100n
10µ
1µ
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
1n 10m
100µA
1mA
10µA
1µA
I
REF
= 10nA TO 1mA
100nA
10nA
V
LOGV1
vs. I
REF
MAX4207 toc05
I
REF
(A)
V
LOGV1
(V)
1m
100µ10n 100n
10µ
1µ
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
1n 10m
100µA
1mA
10µA
1µA
100nA
10nA
I
LOG
= 10nA TO 1mA
NORMALIZED LOG CONFORMANCE
ERROR vs. I
REF
MAX4207 toc08
I
REF
(A)
ERROR (mV)
1m
100µ10n 100n
10µ
1µ
-15
-10
-5
0
5
10
15
20
-20
1n 10m
I
LOG
= 1µA
T
A
= -40°C TO +85°C
T
A
= -40°C
NORMALIZED LOG CONFORMANCE
ERROR vs. I
LOG
MAX4207 toc09
I
LOG
(A)
ERROR (mV)
1m
100µ10n 100n
10µ
1µ
-15
-10
-5
0
5
10
15
20
-20
1n 10m
I
REF
= 10nA, 100nA, 1µA, 10µA, 100µA, 1mA
1m100µ10n 100n 1µ 10µ1n 10m
V
LOGV1
vs. I
LOG
MAX4207 toc02
I
LOG
(A)
V
LOGV1
(V)
-1.00
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
-1.25
T
A
= -40°C TO +85°C
V
CC
= +2.7V
V
EE
= -2.7V
NORMALIZED LOG CONFORMANCE
ERROR vs. I
LOG
MAX4207 toc06
I
LOG
(A)
ERROR (mV)
1m
100µ10n 100n
10µ
1µ
-15
-10
-5
0
5
10
15
20
-20
1n 10m
T
A
= -40°C
T
A
= -40°C TO +85°C
NORMALIZED LOG CONFORMANCE
ERROR vs. I
LOG
MAX4207 toc07
I
LOG
(A)
ERROR (mV)
1m
100µ10n 100n
10µ
1µ
-15
-10
-5
0
5
10
15
20
-20
1n 10m
T
A
= -40°C TO +85°C
V
CC
= +2.7V
V
EE
= -2.7V
T
A
= -40
°
C