LOG104_14 Datasheet, PDF (2/15 Pages) Texas Instruments – LOGARITHMIC AND LOG RATIO AMPLIFIER

ABSOLUTE MAXIMUM RATINGS⁽¹⁾
Supply Voltage, V+ to V– .................................................................... 36V
Input Voltage ....................................................... V– (–0.5) to V+ (+0.5V)
Input Current ................................................................................... ±10mA
Output Short-Circuit⁽²⁾ .............................................................. Continuous
Operating Temperature .................................................... –40°C to +85°C
Storage Temperature ..................................................... –55°C to +125°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. (2) Short-circuit to ground.
PIN DESCRIPTION
Top View
SO
I₁ 1
NC 2
V_OUT 3
V+ 4
LOG104
8 I₂
7 NC
6 GND
5 V–
NC = No Internal Connection
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degrada-
tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
PACKAGE/ORDERING INFORMATION⁽¹⁾
PRODUCT
PACKAGE-LEAD
PACKAGE
DESIGNATOR
PACKAGE
MARKING
LOG104AID
SO -8
D
LOG104
NOTES: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at
www.ti.com.
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range, T_A = –5°C to +75°C.
At T_A = +25°C, V_S = ±5V, R_OUT = 10kΩ, unless otherwise noted.
LOG104AID
PARAMETER
CONDITION
MIN
TYP
MAX
CORE LOG FUNCTION
I_IN / V_OUT Equation
LOG CONFORMITY ERROR⁽¹⁾
Initial
over Temperature
GAIN⁽³⁾
Initial Value
Gain Error
vs Temperature
INPUT, A1 and A2
Offset Voltage
vs Temperature
vs Power Supply (PSRR)
Input Bias Current
vs Temperature
Voltage Noise
Current Noise
Common-Mode Voltage Range (Positive)
(Negative)
Common-Mode Rejection Ratio (CMRR)
OUTPUT, A2 (V_OUT)
Output Offset, V_OSO, Initial
vs Temperature
Full-Scale Output (FSO)
Short-Circuit Current
1nA to 100µA (5 decades)
100pA to 3.5mA (7.5 decades)
1nA to 100µA (5 decades)
100pA to 3.5mA (7.5 decades)⁽²⁾
1nA to 100µA
1nA to 100µA
T_MIN to T_MAX
T_MIN to T_MAX
V_S = ±4.5V to ±18V
T_MIN to T_MAX
f = 10Hz to 10kHz
f = 1kHz
f = 1kHz
T_MIN to T_MAX
V_S = ±5V
V_O = (0.5V)log (I₁/I₂)
0.01
0.2
0.06
0.0001
0.0005
0.5
0.15
±1
0.003
0.01
±0.3
±1.5
±2
5
50
±5
Doubles Every 10°C
3
30
4
(V+) – 2
(V+) – 1.5
(V–) + 2
(V–) + 1.2
105
±3
±15
±2
(V–) + 1.2
(V+) – 1.5
±18
UNITS
V
%
%
% / °C
% / °C
V/decade
%
% / °C
mV
µV/°C
µV/V
pA
µVrms
nV/√Hz
fA/√Hz
V
V
dB
mV
µV/°C
V
mA
2
www.ti.com
LOG104
SBOS243C