MAX4207 Maxim, MAX4207 Datasheet - Page 4

• Manufacturer Part Number: MAX4207
• Description: The MAX4207 logarithmic amplifier computes the log ratio of an input current relative to a reference current (externally or internally generated) and provides a corresponding voltage output with a default -0
• Manufacturer: Maxim

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