MAX4207 Maxim, MAX4207 Datasheet - Page 5

• 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

(V
T
Amplifier with Over 5 Decades of Dynamic Range
A
CC
= +25°C, unless otherwise noted.)
-10
-15
-20
20
15
10
-5
5
0
= +5V, V
1n
I LOG = 10nA, 100nA, 1µA, 10µA, 100µA, 1mA
NORMALIZED LOG CONFORMANCE
10n 100n
+0.25V
-0.25V
-0.50V
-0.75V
-0.25V
-0.50V
EE
0V
0V
= -5V, GND = 0V, I
ERROR vs. I
1µ
_______________________________________________________________________________________
I
REF
(A)
10µ
I
LOG
REF
Precision Transimpedance Logarithmic
100µ
PULSE RESPONSE
(I
REF
20µs/div
1m
= 1µA)
REF
10m
= 1µA, I
MAX4207 toc13
LOG
Typical Operating Characteristics (continued)
-10
-15
-20
20
15
10
-5
5
0
1n
= 10µA, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, R
1µA TO 100nA
10µA TO 1µA
100µA TO 10µA
1mA TO 100µA
(V
(V
(V
NORMALIZED LOG CONFORMANCE
CC
CC
CC
10n 100n
= +2.7V, V
= +5V, V
= +5.5V, V
EE
ERROR vs. I
EE
EE
= -5V)
= -2.7V)
= -5.5V)
1µ
I
LOG
(A)
10µ
LOG
100µ
-0.25V
1m
0.50V
0.25V
0.75V
0.50V
0.25V
0V
0V
10m
I
REF
-1
-2
-3
-4
-5
4
3
2
1
0
PULSE RESPONSE
(I
1n
LOG
20µs/div
= 1µA)
10n 100n
(V
INPUT OFFSET VOLTAGE
LOGIIN
- V
1µ
MAX4207 toc14
I
LOG
CMVIN
(A)
10µ
vs. I
100µA TO 1mA
10µA TO 100µA
1µA TO 10µA
100nA TO 1µA
100µ
SET
LOG
)
> 1MΩ,
1m
10m
5