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LOG100 반도체 회로 부품 판매점

Precision LOGARITHMIC AND LOG RATIO AMPLIFIER



Burr-Brown Corporation 로고
Burr-Brown Corporation
LOG100 데이터시트, 핀배열, 회로
® LOG100
Precision
LOGARITHMIC AND LOG RATIO AMPLIFIER
FEATURES
q ACCURACY
0.37% FSO max Total Error
Over 5 Decades
q LINEARITY
0.1% max Log Conformity
Over 5 Decades
q EASY TO USE
Pin-selectable Gains
Internal Laser-trimmed Resistors
q WIDE INPUT DYNAMIC RANGE
6 Decades, 1nA to 1mA
q HERMETIC CERAMIC DIP
DESCRIPTION
The LOG100 uses advanced integrated circuit tech-
nologies to achieve high accuracy, ease of use, low
cost, and small size. It is the logical choice for your
logarithmic-type computations. The amplifier has guar-
anteed maximum error specifications over the full six-
decade input range (1nA to 1mA) and for all possible
combinations of I1 and I2. Total error is guaranteed so
that involved error computations are not necessary.
The circuit uses a specially designed compatible thin-
film monolithic integrated circuit which contains am-
plifiers, logging transistors, and low drift thin-film
9
–VCC
1
I1
Q1
A1
Q2
14
I2
6
+VCC
10
Com
VOUT = K LOG
I1
I2
APPLICATIONS
q LOG, LOG RATIO AND ANTILOG
COMPUTATIONS
q ABSORBANCE MEASUREMENTS
q DATA COMPRESSION
q OPTICAL DENSITY MEASUREMENTS
q DATA LINEARIZATION
q CURRENT AND VOLTAGE INPUTS
resistors. The resistors are laser-trimmed for maxi-
mum precision. FET input transistors are used for the
amplifiers whose low bias currents (1pA typical) per-
mit signal currents as low as 1nA while maintaining
guaranteed total errors of 0.37% FSO maximum.
Because scaling resistors are self-contained, scale
factors of 1V, 3V or 5V per decade are obtained
simply by pin selections. No other resistors are re-
quired for log ratio applications. The LOG100 will
meet its guaranteed accuracy with no user trimming.
Provisions are made for simple adjustments of scale
factor, offset voltage, and bias current if enhanced
performance is desired.
A2
270
220
7.5k
24k
7
VOUT
3
K=1
4
K=3
5
K=5
39k
Scale
Factor
2 Trim
Resistor values nominal only;
laser-trimmed for precision gain.
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1981 Burr-Brown Corporation
PDS-437E
Printed in U.S.A. January, 1995


LOG100 데이터시트, 핀배열, 회로
SPECIFICATIONS
ELECTRICAL
TA = +25°C and ±VCC = ±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
CC = 4500pF
CC = 150pF
CC = 150pF
CC = 50pF
CC = 150pF
CC = 150pF
OUTPUT CHARACTERISTICS
Full Scale Output (FSO)
Rated Output
Voltage
Current
Current Limit
Positive
Negative
Impedance
IOUT = ±5mA
VOUT = ±10V
LOG100JP
MIN TYP MAX
VOUT = K Log (I1/I2)
0.04
0.15
0.002
0.001
1, 3, 5
0.3
0.03
0.1
0.25
±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
±55
±30
±25
±20
±25
±30
±37
±0.7
±80
1
Doubles Every 10°C
3
0.5
±5
5(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
®
LOG100
2




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