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LOG101AIDR 반도체 회로 부품 판매점

Precision LOGARITHMIC AND LOG RATIO AMPLIFIER



Burr-Brown Corporation 로고
Burr-Brown Corporation
LOG101AIDR 데이터시트, 핀배열, 회로
LOG101
LOG101
SBOS242B – MAY 2002 – REVISED JUNE 2004
Precision
LOGARITHMIC AND LOG RATIO AMPLIFIER
FEATURES
q EASY-TO-USE COMPLETE CORE FUNCTION
q HIGH ACCURACY: 0.01% FSO Over 5 Decades
q WIDE INPUT DYNAMIC RANGE:
7.5 Decades, 100pA to 3.5mA
q LOW QUIESCENT CURRENT: 1mA
q WIDE SUPPLY RANGE: ±4.5V to ±18V
APPLICATIONS
q LOG, LOG RATIO COMPUTATION:
Communication, Analytical, Medical, Industrial,
Test, and General Instrumentation
q PHOTODIODE SIGNAL COMPRESSION AMPS
q ANALOG SIGNAL COMPRESSION IN FRONT
OF ANALOG-TO-DIGITAL (A/D) CONVERTERS
DESCRIPTION
The LOG101 is a versatile integrated circuit that computes
the logarithm or log ratio of an input current relative to a
reference current.
The LOG101 is tested over a wide dynamic range of input
signals. In log ratio applications, a signal current can come
from a photodiode, and a reference current from a resistor in
series with a precision external reference.
The output signal at VOUT is trimmed to 1V per decade of input
current allowing seven decades of input current dynamic
range.
Low DC offset voltage and temperature drift allow accurate
measurement of low-level signals over a wide environmental
temperature range. The LOG101 is specified over the tem-
perature range –5°C to +75°C, with operation over
–40°C to +85°C.
Note: Protected under US Patent #6,667,650; other patents pending.
I2
I1
1
VOUT = (1V) LOG (I1/I2)
V+
48
Q1 Q2
CC
LOG101
A1
A2
3
VOUT
R2
R1
56
GND
V
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2002-2004, Texas Instruments Incorporated


LOG101AIDR 데이터시트, 핀배열, 회로
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
I1 1
NC 2
VOUT 3
V+ 4
LOG101
8 I2
7 NC
6 GND
5 V
SO
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
LOG101AID
"
PACKAGE-LEAD
SO -8
"
PACKAGE
DESIGNATOR
D
"
SPECIFIED
TEMPERATURE
RANGE
5°C to +75°C
"
PACKAGE
MARKING
LOG101
"
ORDERING
NUMBER
LOG101AID
LOG101AIDR
TRANSPORT
MEDIA, QUANTITY
Rails, 100
Tape and Reel, 2500
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet.
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range, TA = 5°C to +75°C.
At TA = +25°C, VS = ±5V, and ROUT = 10k, unless otherwise noted.
LOG101AID
PARAMETER
CONDITION
MIN
TYP
MAX
CORE LOG FUNCTION
IIN / VOUT 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 (VOUT)
Output Offset, VOSO, 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
TMIN to TMAX
TMIN to TMAX
VS = ±4.5V to ±18V
TMIN to TMAX
f = 10Hz to 10kHz
f = 1kHz
f = 1kHz
TMIN to TMAX
VS = ±5V
VO = (1V) log (I1/I2)
0.01
0.06
0.0001
0.0005
0.2
1
0.15
0.003
±1
0.01
±0.3
±2
5
±5
Doubles Every 10°C
3
30
4
(V+) 2
(V+) 1.5
(V) + 2
(V) + 1.2
105
±1.5
50
±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
LOG101
SBOS242B




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LOG101AID

Precision LOGARITHMIC AND LOG RATIO AMPLIFIER - Burr-Brown Corporation



LOG101AIDR

Precision LOGARITHMIC AND LOG RATIO AMPLIFIER - Burr-Brown Corporation