Datasheet

MAX4206
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
6 _______________________________________________________________________________________
-0.25
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
-0.50
V
LOGV1
vs. I
LOG
(I
REF
= 10nA TO 1mA)
MAX4206 toc04
I
LOG
(A)
V
LOGV1
(V)
1m100
µ
100n 1
µ
10
µ
10n 10m
10nA
100nA
1
µ
A
10
µ
A
100
µ
A
1mA
V
LOGV1
vs. I
REF
(I
LOG
= 10nA TO 1mA)
MAX4206 toc05
I
REF
(A)
V
LOGV1
(V)
100
µ
10
µ
1
µ
100n10n
-0.25
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
-0.50
1n 1m
1
µ
A
10
µ
A
100
µ
A
1mA
100nA
10nA
-15
-10
-5
0
5
10
15
20
-20
NORMALIZED LOG CONFORMANCE
ERROR vs. I
LOG
MAX4206 toc06
I
LOG
(A)
ERROR (mV)
1m100
µ
100n 1
µ
10
µ
10n 10m
I
REF
= 10nA
T
A
= -40
°
C TO +85
°
C
V
CC
= +5V
V
EE
= GND
T
A
= -40
°
C
1m100
µ
10n 100n 1
µ
10
µ
1n 10m
-15
-10
-5
0
5
10
15
20
-20
NORMALIZED LOG CONFORMANCE
ERROR vs. I
LOG
MAX4206 toc07
I
LOG
(A)
ERROR (mV)
I
REF
= 10nA
T
A
= -40
°
C TO +85
°
C
V
CC
= +5V
V
EE
= -5V
T
A
= -40
°
C
-15
-10
-5
0
5
10
15
20
-20
NORMALIZED LOG CONFORMANCE
ERROR vs. I
LOG
MAX4206 toc08
I
LOG
(A)
ERROR (mV)
1m100
µ
100n 1
µ
10
µ
10n 10m
I
REF
= 10nA
T
A
= -40
°
C TO +85
°
C
V
CC
= +2.7V
V
EE
= GND
T
A
= -40
°
C
-15
-10
-5
0
5
10
15
20
-20
NORMALIZED LOG CONFORMANCE
ERROR vs. I
LOG
MAX4206 toc09
I
LOG
(A)
ERROR (mV)
1m100
µ
100n 1
µ
10
µ
10n 10m
I
REF
= 10nA
SINGLE SUPPLY: V
CC
= +2.7V, +5V, 11V,
V
EE
= GND
DUAL SUPPLY: V
CC
= +5V
V
EE
= -5V
V
LOGIIN
- V
CMVIN
vs. I
LOG
MAX4206 toc10
I
LOG
(A)
V
LOGIIN
- V
CMVIN
(mV)
1m100µ100n 1µ 10µ
5
4
3
2
1
0
-1
-2
-3
-4
-5
10n1n 10m
I
REF
= 10nA
V
LOGV2
VOLTAGE-NOISE DENSITY
vs. FREQUENCY
MAX4206 toc11
FREQUENCY (Hz)
1M100k10k1k10010
0.1
1
10
0.01
110M
NOISE DENSITY (µV/√Hz)
I
REF
= I
LOG
100nA
10nA
1
µ
A
10
µ
A
TOTAL WIDEBAND VOLTAGE NOISE
AT V
LOGV2
vs. I
LOG
MAX4206 toc12
I
LOG
(A)
VOLTAGE NOISE (mV
RMS
)
100µ10µ1µ100n
1
2
3
4
5
0
10n 1m
I
REF
= I
LOG
f = 1Hz TO 1MHz
Typical Operating Characteristics (continued)
(V
CC
= +5V, V
EE
= GND = 0V, I
REF
= 1µA, I
LOG
= 10µA, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, R
SET
> 1MΩ,
T
A
= +25°C, unless otherwise noted.)