after 15 minute warm-up, unless otherwise specified.
LOG100JP
PARAMETER
TRANSFER FUNCTION
Log Conformity Error
(1)
Initial
Over Temperature
K Range
(2)
Accuracy
Temperature Coefficient
ACCURACY
Total Error
(3)
Initial
K = 1,
(4)
Current Input Operation
I
1
, I
2
= 1mA
I
1
, I
2
= 100µA
I
1
, I
2
= 10µA
I
1
, I
2
= 1µA
I
1
, I
2
= 100nA
I
1
, I
2
= 10nA
I
1
, I
2
= 1nA
I
1
, I
2
= 1mA
I
1
, I
2
= 100µA
I
1
, I
2
= 10µA
I
1
, I
2
= 1µA
I
1
, I
2
= 100nA
I
1
, I
2
= 10nA
I
1
, I
2
= 1nA
I
1
, I
2
= 1mA
I
1
, I
2
= 100µA
I
1
, I
2
= 10µA
I
1
, I
2
= 1µA
I
1
, I
2
= 100nA
I
1
, I
2
= 10nA
I
1
, I
2
= 1nA
±0.20
±0.37
±0.28
±0.033
±0.28
±0.51
±1.26
±4.3
±1.5
±0.37
±0.11
±0.61
±0.91
±2.6
CONDITIONS
Either I
1
or I
2
1nA to 100µA (5 decades)
1nA to 1mA (6 decades)
1nA to 100µA (5 decades)
1nA to 1mA (6 decades)
MIN
TYP
V
OUT
= K Log (I
1
/I
2
)
0.04
0.15
0.002
0.001
1, 3, 5
0.3
0.03
0.1
0.25
%
%
%/°C
%/°C
V/decade
%
%/°C
MAX
UNITS
±55
±30
±25
±20
±25
±30
±37
mV
mV
mV
mV
mV
mV
mV
mV/°C
mV/°C
mV/°C
mV/°C
mV/°C
mV/°C
mV/°C
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
vs Temperature
vs Supply
INPUT CHARACTERISTICS
(of Amplifiers A
1
and A
2
)
Offset Voltage
Initial
vs Temperature
Bias Current
Initial
vs Temperature
Voltage Noise
10Hz to 10kHz, RTI
Current Noise
10Hz to 10kHz, RTI
AC PERFORMANCE
3dB Response
(6)
, I
2
= 10µA
1nA
1µA
10µA
1mA
Step Response
(6)
Increasing
1µA to 1mA
100nA to 1µA
10nA to 100nA
Decreasing
1mA to 1µA
1µA to 100nA
100nA to 10nA
OUTPUT CHARACTERISTICS
Full Scale Output (FSO)
Rated Output
Voltage
Current
Current Limit
Positive
Negative
Impedance
±0.7
±80
1
Doubles Every 10°C
3
0.5
±5
mV
µV/°C
pA
µVrms
pArms
5
(5)
C
C
= 4500pF
C
C
= 150pF
C
C
= 150pF
C
C
= 50pF
C
C
= 150pF
0.11
38
27
45
kHz
kHz
kHz
kHz
11
7
110
C
C
= 150pF
45
20
550
±10
I
OUT
=
±5mA
V
OUT
=
±10V
±10
±5
12.5
15
0.05
µs
µs
µs
µs
µs
µs
V
V
mA
mA
mA
Ω
®
LOG100
2
SPECIFICATIONS
ELECTRICAL
(CONT)
T
A
= +25°C and
±V
CC
=
±15V,
after 15 minute warm-up, unless otherwise specified.
LOG100JP
PARAMETER
POWER SUPPLY REQUIREMENTS
Rated Voltage
Operating Range
Quiescent Current
AMBIENT TEMPERATURE RANGE
Specification
Operating Range
Storage
CONDITIONS
MIN
TYP
±15
±7
MAX
UNITS
VDC
VDC
mA
°C
°C
°C
Derated Performance
±12
±18
±9
+70
+85
+85
Derated Performance
0
–25
–40
NOTES: (1) Log Conformity Error is the peak deviation from the best-fit straight line of the V
OUT
vs Log I
IN
curve expressed as a percent of peak-to-peak full scale
output. (2) May be trimmed to other values. See Applications section. (3) The worst-case Total Error for any ratio of I
1
/I
2
is the largest of the two errors when
I
1
and I
2
are considered separately. (4) Total Error at other values of K is K times Total Error for K = 1. (5) Guaranteed by design. Not directly measurable due to
amplifier’s committed configuration. (6) 3dB and transient response are a function of both the compensation capacitor and the level of input current. See Typical
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