LOG100 Datasheet, PDF (2/9 Pages) Burr-Brown (TI) – Precision LOGARITHMIC AND LOG RATIO AMPLIFIER

SPECIFICATIONS
ELECTRICAL
T_A = +25°C and ±V_CC = ±15V, after 15 minute warm-up, unless otherwise specified.
PARAMETER
CONDITIONS
TRANSFER FUNCTION
Log Conformity Error⁽¹⁾
Initial
Over Temperature
K Range⁽²⁾
Accuracy
Temperature Coefficient
Either I₁ or I₂
1nA to 100µA (5 decades)
1nA to 1mA (6 decades)
1nA to 100µA (5 decades)
1nA to 1mA (6 decades)
ACCURACY
Total Error⁽³⁾
Initial
K = 1,⁽⁴⁾ Current Input Operation
I₁, I₂ = 1mA
I₁, I₂ = 100µA
I₁, I₂ = 10µA
I₁, I₂ = 1µA
I₁, I₂ = 100nA
I₁, I₂ = 10nA
I₁, I₂ = 1nA
vs Temperature
I₁, I₂ = 1mA
I₁, I₂ = 100µA
I₁, I₂ = 10µA
I₁, I₂ = 1µA
I₁, I₂ = 100nA
I₁, I₂ = 10nA
I₁, I₂ = 1nA
vs Supply
I₁, I₂ = 1mA
I₁, I₂ = 100µA
I₁, I₂ = 10µA
I₁, I₂ = 1µA
I₁, I₂ = 100nA
I₁, I₂ = 10nA
I₁, I₂ = 1nA
INPUT CHARACTERISTICS (of Amplifiers A₁ and A₂)
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⁾, I₂ = 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
C_C = 4500pF
C_C = 150pF
C_C = 150pF
C_C = 50pF
C_C = 150pF
C_C = 150pF
OUTPUT CHARACTERISTICS
Full Scale Output (FSO)
Rated Output
Voltage
Current
Current Limit
Positive
Negative
Impedance
I_OUT = ±5mA
V_OUT = ±10V
LOG100JP
MIN
TYP
MAX
V_OUT = K Log (I₁/I₂)
0.04
0.1
0.15
0.25
0.002
0.001
1, 3, 5
0.3
0.03
±55
±30
±25
±20
±25
±30
±37
±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
±0.7
±5
±80
1
5⁽⁵⁾
Doubles Every 10°C
3
0.5
0.11
38
27
45
11
7
110
45
20
550
±10
±10
±5
12.5
15
0.05
UNITS
%
%
%/°C
%/°C
V/decade
%
%/°C
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
mV
µV/°C
pA
µVrms
pArms
kHz
kHz
kHz
kHz
µs
µs
µs
µs
µs
µs
V
V
mA
mA
mA
Ω
®
LOG100
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