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LOG100 Datasheet(PDF) 1 Page - Burr-Brown (TI) |
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LOG100 Datasheet(HTML) 1 Page - Burr-Brown (TI) |
1 / 9 page LOG100 Precision LOGARITHMIC AND LOG RATIO AMPLIFIER 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. 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 I 1 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 PDS-437E 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 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 ® 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 7 A 2 A 1 1 14 I 1 9 –V CC 6 +V CC 10 Com I 2 Q 1 Q 2 V OUT 3 K = 1 4 K = 3 5 K = 5 2 Scale Factor Trim 39k Ω 24k Ω 7.5k Ω 270 Ω 220 Ω Resistor values nominal only; laser-trimmed for precision gain. V OUT = K LOG I 1 I 2 © 1981 Burr-Brown Corporation PDS-437E Printed in U.S.A. January, 1995 |
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