Datasheet

MAX4206
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS—Single-Supply Operation
(V
CC
= +5V, V
EE
= GND = 0, I
REF
= 1µA, I
LOG
= 10µA, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, R
SET
> 1MΩ,
T
A
= +25°C, unless otherwise noted.)
DC ELECTRICAL CHARACTERISTICS—Single-Supply Operation (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
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOGV2 BUFFER
T
A
= +25°C 0.4 2
Input Offset Voltage V
IO
T
A
= -40°C to +85°C (Note 4) 6
mV
Input Bias Current I
B
(Note 4)
0.01
1nA
V
OH
R
L
to GND = 2kΩ
V
CC
-
0.2
V
CC
-
0.3
Output Voltage Range
V
OL
R
L
to GND = 2kΩ 0.2
0.08
V
I
OUT+
Sourcing 34
Output Short-Circuit Current
I
OUT-
Sinking 58
mA
Slew Rate SR 12 V/µs
Unity-Gain Bandwidth GBW 5
MHz
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LOGV2 Total Noise
0.1Hz to 10Hz, total output-referred noise,
I
REF
= 10nA, I
LOG
= 100nA
17 µV
RMS
LOGV2 Spot Noise Density f = 5kHz, I
REF
= 10nA, I
LOG
= 100nA 0.8 µV/√Hz
REFVOUT Total Noise 1Hz to 10Hz, total output-referred noise 3.3 µV
RMS
REFVOUT Spot Noise Density f = 5kHz 266 nV/√Hz
REFISET Total Noise 1Hz to 10Hz, total output-referred noise 0.67 µV
RMS
REFISET Spot Noise Density f = 5kHz 23 nV/√Hz
Small-Signal Unity-Gain
Bandwidth
I
REF
= 1µA, I
LOG
= 10µA, R
COMP
= 300Ω,
C
COMP
= 32pF
1MHz
DC ELECTRICAL CHARACTERISTICS—Dual-Supply Operation
(V
CC
= +5V, V
EE
= -5V, GND = 0, I
REF
= 1µA, I
LOG
= 10µA, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, R
SET
> 1MΩ,
T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
V
CC
2.7 5.5
Supply Voltage (Note 2)
V
EE
-2.7 -5.5
V
T
A
= +25°C 5 6
Supply Current I
CC
T
A
= -40°C to +85°C 7.5
mA
Minimum 10 nA
LO GIIN C ur r ent Rang e ( N otes 3, 4)
I
LOG
Maximum 1 mA
Minimum 10 nA
RE FIIN C ur r ent Rang e ( N otes 3, 4)
I
REF
Maximum 1 mA
Common-Mode Voltage
V
CMVOUT
480 500 520
mV