Datasheet

MAX4207
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
_______________________________________________________________________________________ 5
NORMALIZED LOG CONFORMANCE
ERROR vs. I
REF
MAX4207 toc10
I
REF
(A)
ERROR (mV)
1m
100
µ
10n 100n
10
µ
1
µ
-15
-10
-5
0
5
10
15
20
-20
1n 10m
I
LOG
= 10nA, 100nA, 1µA, 10µA, 100µA, 1mA
NORMALIZED LOG CONFORMANCE
ERROR vs. I
LOG
MAX4207 toc11
I
LOG
(A)
ERROR (mV)
1m
100
µ
10n 100n
10
µ
1
µ
-15
-10
-5
0
5
10
15
20
-20
1n 10m
(V
CC
= +2.7V, V
EE
= -2.7V)
(V
CC
= +5V, V
EE
= -5V)
(V
CC
= +5.5V, V
EE
= -5.5V)
INPUT OFFSET VOLTAGE
(V
LOGIIN
- V
CMVIN
vs. I
LOG
)
MAX4207 toc12
I
LOG
(A)
V
LOGIIN
- V
CMVIN
(mV)
1m
100
µ
10n 100n
10
µ
1
µ
-4
-2
-3
-1
0
1
2
3
4
-5
1n 10m
I
LOG
PULSE RESPONSE
(I
REF
= 1µA)
MAX4207 toc13
20
µ
s/div
+0.25V
-0.25V
-0.50V
-0.75V
1
µ
A TO 100nA
10
µ
A TO 1
µ
A
100
µ
A TO 10
µ
A
1mA TO 100
µ
A
0V
0V
-0.25V
-0.50V
I
REF
PULSE RESPONSE
(I
LOG
= 1µA)
MAX4207 toc14
20
µ
s/div
0.75V
0.25V
0V
-0.25V
100
µ
A TO 1mA
10
µ
A TO 100
µ
A
1
µ
A TO 10
µ
A
100nA TO 1
µ
A
0.50V
0.50V
0.25V
0V
Typical Operating Characteristics (continued)
(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.)