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PDF LOG114 Data sheet ( Hoja de datos )
| Número de pieza | LOG114 | |
| Descripción | Precision/ High-Speed Transimpedance Amplifier | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LOG114 (archivo pdf) en la parte inferior de esta página. Total 3 Páginas | ||
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LOG114
SBOS301 − MAY 2004
Single-Supply, High-Speed, Precision
LOGARITHMIC AMPLIFIER
FEATURES
D EASY-TO-USE COMPLETE FUNCTION
D TWO OUTPUT, WIDE BW SCALING
AMPLIFIERS
D WIDE INPUT DYNAMIC RANGE:
8 Decades, 100pA to 10mA
D 2.5V REFERENCE
D EXCELLENT GAIN STABILITY OVER
TEMPERATURE
D LOW QUIESCENT CURRENT: 10mA
D DUAL OR SINGLE SUPPLY: +5V, +5V
D PACKAGE: Small QFN-16 (4mm x 4mm)
D SPECIFIED TEMPERATURE RANGE:
−5°C to +75°C
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APPLICATIONS
D LOG, LOG-RATIO FUNCTION FOR TEST,
GENERAL INSTRUMENTATION
D PHOTODIODE SIGNAL COMPRESSION AMP
D ANALOG SIGNAL COMPRESSION IN FRONT
OF ANALOG-TO-DIGITAL CONVERTER (ADC)
D ABSORBANCE MEASUREMENT
D OPTICAL DENSITY MEASUREMENT
Q1
DESCRIPTION
The LOG114 computes the logarithm or log-ratio of an
input current or voltage relative to a reference current
or voltage.
High precision is ensured over a wide dynamic range of
input signals on either bipolar or single supply. Special
temperature drift compensation circuitry is included
on-chip. In log-ratio applications, a signal current can
come from a photodiode, and a reference current from
a resistor in series with a precision internal voltage
refernce.
The output signal at VLOGOUT is trimmed to 0.375V out
per decade of input current. If more range is needed, the
supply voltage can be increased on the LOG114 and the
output can be scaled with one of the available additional
amplifiers, if desired. Low dc offset voltage and
temperature drift allow accurate measurement of
low-level signals over a wide environmental
temperature range. The LOG114 is specified over a
−5°C to +75°C temperature range.
R5 R6
VLOG OUT
9
+IN4 −IN4
10 11
I1
4
VCM IN
5
I1 and I2 are current inputs
from a photodiode
or other current source
I2
3
IREF
RREF
16
VREF
2.5V
A1
Q2
R1
R2
A3
A4
R3 R4
A2
REF
VLOG = 0.375 × log(I1/I2)
V04 = 0.375 × K × log(I1/I2)
K = 1 + R6/R5
1 VREF GND
86
V+ V−
7 Com
A5
14
− IN5
VO4
12
13 +IN5
15 VO5
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.
PRODUCT PREVIEW information concerns products in the formative or design
phase of development. Characteristic data and other specifications are design
goals. Texas Instruments reserves the right to change or discontinue these
products without notice.
www.ti.com
Copyright 2004, Texas Instruments Incorporated
1 page | ||
| Páginas | Total 3 Páginas | |
| PDF Descargar | [ Datasheet LOG114.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LOG112 | Precision/ High-Speed Transimpedance Amplifier | Burr-Brown Corporation |
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| LOG114 | Precision/ High-Speed Transimpedance Amplifier | Burr-Brown Corporation |
| LOG114 | Single-Supply High-Speed Precision Logarithmic Amplifier (Rev. A) | Texas Instruments |
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