LOG112AIDRE4 Datasheet, PDF (4/20 Pages) Texas Instruments – Precision LOGARITHMIC AND LOG RATIO AMPLIFIERS

ELECTRICAL CHARACTERISTICS (Cont.)
Boldface limits apply over the specified temperature range, T_A = –5°C to +75°C.
At T_A = +25°C, V_S = ±5V, and R_L = 10kΩ, unless otherwise noted.
LOG112, LOG2112
PARAMETER
CONDITION
MIN
TYP
MAX
FREQUENCY RESPONSE, CORE LOG⁽⁵⁾
BW, 3dB
I₂ = 10nA
I₂ = 1µA
I₂ = 10µA
I₂ = 1mA
Step Response
Increasing
I₁ = 10nA to 100nA
I₁ = 1µA to 100µA
I₁ = 1µA to 1mA
Decreasing
I₁ = 100nA to 10nA
I₁ = 100µA to 1µA
I₁ = 1mA to 1µA
Increasing
I₂ = 10nA to 100nA
I₂ = 1µA to 100µA
I₂ = 1µA to 1mA
Decreasing
I₂ = 100nA to 10nA
I₂ = 100µA to 1µA
I₂ = 1mA to 1µA
OP AMP, A3
Input Offset Voltage
vs Temperature
vs Supply
Input Bias Current
Input Offset Current
Input Voltage Range
Input Noise, f = 0.1Hz to 10Hz
f = 1kHz
Open-Loop Voltage Gain
Gain-Bandwidth Product
Slew Rate
Settling Time, 0.01%
Rated Output
Short-Circuit Current
VOLTAGE REFERENCE
Bandgap Voltage
Error, Initial
vs Temperature
vs Supply
vs Load
Short-Circuit Current
POWER SUPPLY
Operating Range
Quiescent Current
LOG112
LOG2112
TEMPERATURE RANGE
Specified Range, T_MIN to T_MAX
Operating Range
Storage Range
Thermal Resistance, θ_JA SO-14
SO-16
C_C = 4500pF
C_C = 150pF
C_C = 150pF
C_C = 50pF
C_C = 120pF, I₂ = 31.6nA
C_C = 375pF, I₂ = 10µA
C_C = 950pF, I₂ = 31.6µA
C_C = 120pF, I₂ = 31.6nA
C_C = 375pF, I₂ = 10µA
C_C = 950pF, I₂ = 31.6µA
C_C = 125pF, I₁ = 31.6nA
C_C = 750pF, I₁ = 10µA
C_C = 10.5nF, I₁ = 31.6µA
C_C = 125pF, I₁ = 31.6nA
C_C = 750pF, I₁ = 10µA
C_C = 10.5nF, I₁ = 31.6µA
T_MIN to T_MAX
V_S = ±4.5V to ±18V
G = –1, 3V Step, C_L = 100pF
T_MIN to T_MAX
V_S = ±4.5V to ±18V
I_LOAD = 10mA
V_S
I_O = 0
(V–)
(V–) + 1.5
±4.5
–5
–40
–55
0.1
38
40
45
1.1
1.6
1.5
2.1
31.2
39
2.6
113
1.2
630
6.6
13.3
+250
±2
5
–10
±0.5
1
28
88
1.4
0.5
16
±4
2.5
±0.05
±25
±10
±600
16
±1.25
±2.5
110
80
±1000
50
(V+) – 1.5
(V+) – 0.9
±0.5
±18
±1.75
±3.5
75
85
125
UNITS
kH
kH
kH
kHz
ms
µs
µs
ms
µs
µs
ms
µs
ms
µs
µs
µs
µV
µV/°C
µV/V
nA
nA
V
µV_PP
nV/^√Hz
dB
MHz
V/µs
µs
V
mA
V
%
ppm/°C
ppm/V
ppm/mA
mA
V
mA
mA
°C
°C
°C
°C/W
°C/W
NOTES: (1) Log Conformity Error is the peak deviation from the best-fit-straight line of V_O vs LOG(I₁/I₂) curve expressed as a percent of peak-to-peak full-scale
output. K, scale factor, equals 0.5V output per decade of input current. (2) Scale factor of core log function is trimmed to 0.5V output per decade change of input
current. (3) Worst-case Total Error for any ratio of I₁/I₂, as the largest of the two errors, when I₁ and I₂ are considered separately. (4) Total Error includes offset
voltage, bias current, gain, and log conformity. (5) Bandwidth (3dB) and transient response are a function of both the compensation capacitor and the level of input
current.
4
LOG112, 2112
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