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LT1126CS8 Datasheet(PDF) 6 Page - Linear Technology |
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LT1126CS8 Datasheet(HTML) 6 Page - Linear Technology |
6 / 8 page 6 LT1126/LT1127 S APPLICATI I FOR ATIO Matching Specifications In many applications the performance of a system de- pends on the matching between two op amps, rather than the individual characteristics of the two devices. The three op amp instrumentation amplifier configuration shown in this data sheet is an example. Matching characteristics are not 100% tested on the LT1126/LT1127. Some specifications are guaranteed by definition. For example, 70 µV maximum offset voltage implies that mis- match cannot be more than 140 µV. 112dB (= 2.5µV/V) CMRR means that worst case CMRR match is 106dB (5 µV/V). However, the following table can be used to estimate the expected matching performance between the two sides of the LT1126, and between amplifiers A and D, and between amplifiers B and C of the LT1127. High Speed Operation When the feedback around the op amp is resistive (RF), a pole will be created with RF, the source resistance and capacitance (RS, CS), and the amplifier input capacitance (CIN ≈ 2pF). In low closed loop gain configurations and with RS and RF in the kilohm range, this pole can create excess phase shift and even oscillation. A small capacitor (CF) in parallel with RF eliminates this problem. With RS (CS + CIN) = RF CF, the effect of the feedback pole is completely removed. FREQUENCY (Hz) 0.01 0.1 1.0 0.1 10 100 LT1126 • TA04 0.001 1 GAIN ERROR = CLOSED LOOP GAIN OPEN LOOP GAIN TYPICAL PRECISION OP AMP LT1126/LT1127 Gain Error vs Frequency Closed Loop Gain = 1000 – + OUTPUT LT1126 • TA02 RS CS RF CF CIN LT1126AM/AC LT1126M/C LT1127AM/AC LT1127M/C PARAMETER 50% YIELD 98% YIELD 50% YIELD 98% YIELD UNITS VOS Match, ∆VOS LT1126 20 110 30 130 µV LT1127 30 150 50 180 µV Temperature Coefficient Match 0.35 1.0 0.5 1.5 µV/°C Average Non-Inverting IB 618 7 25 nA Match of Non-Inverting IB 722 8 30 nA CMRR Match 126 115 123 112 dB PSRR Match 127 118 127 114 dB Expected Match S APPLICATI TYPICAL Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz – + OUTPUT LT1126 • TA03 365 Ω 1% INPUT 15k 5% 340k 1% 20k TRIM +15V –15V RN60C FILM RESISTORS THE HIGH GAIN AND WIDE BANDWIDTH OF THE LT1126/LT1127 IS USEFUL IN LOW FREQUENCY HIGH CLOSED LOOP GAIN AMPLIFIER APPLICATIONS. A TYPICAL PRECISION OP AMP MAY HAVE AN OPEN LOOP GAIN OF ONE MILLION WITH 500kHz BANDWIDTH. AS THE GAIN ERROR PLOT SHOWS, THIS DEVICE IS CAPABLE OF 0.1% AMPLIFYING ACCURACY UP TO 0.3Hz ONLY. EVEN INSTRUMENTATION RANGE SIGNALS CAN VARY AT A FASTER RATE. THE LT1126/LT1127 “GAIN PRECISION — BANDWIDTH PRODUCT” IS 330 TIMES HIGHER, AS SHOWN. LT1126 |
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