Datasheet

MAX4207
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS—Dual-Supply Operation (continued)
(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
Voltage Reference Output
Current
I
REFVOUT
1mA
T
A
= +25°C
490 500 510
Current Reference Output
Voltage
V
REFISET
T
A
= -40°C to +85°C (Note 4)
482 518
mV
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
V
EE
+
0.2
V
EE
+
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
AC 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
= +25°C, unless otherwise noted.)
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
1
MHz
Note 1: All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 2: Guaranteed and functionally verified.
Note 3: Log conformity error less than ±5mV with scale factor = 0.25V/decade.
Note 4: Guaranteed by design.