Datenblatt-Suchmaschine für elektronische Bauteile |
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AD704JN Datenblatt(PDF) 7 Page - Analog Devices |
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AD704JN Datenblatt(HTML) 7 Page - Analog Devices |
7 / 8 page AD704 REV. A –7– __ R2 ___ 2R2 INSTRUMENTATION AMPLIFIER GAIN = 1 + + (FOR R1 = R3, R2 = R4 + R5) ALL RESISTORS METAL FILM, 1% 1/4 AD704 1/4 AD704 1/4 AD704 1/4 AD704 OPTIONAL BALANCE RESISTOR NETWORKS CAN BE REPLACED WITH A SHORT CAPACITORS C2 AND C4 ARE SOUTHERN ELECTRONICS MPCC, POLYCARBONATE, ±5%, 50 VOLT 0.01 µF C6 R11 2M Ω OUTPUT C3 1M Ω R9 C4 1M Ω R8 0.01 µF C5 C2 1M Ω R7 1M Ω R6 C1 0.1 µF +VS 0.1 µF –VS GAIN TRIM (500k POT) 49.9k R2 6.34k R1 6.34k R3 OPTIONAL AC CMRR TRIM 2.4k R5 47.5k R4 DC CMRR TRIM (5k POT) C t G R +V IN –V IN R1 RG = _________ R8 C3C4 1 R8 = R9 Q = C3 4C4 2 R6 = R7 = 1 _________ R6 C1C2 Q = C1 4C2 1 R10 2M Ω ω ω Figure 24. Gain of 10 Instrumentation Amplifier with Post Filtering The instrumentation amplifier with post filtering (Figure 24) combines two applications which benefit greatly from the AD704. This circuit achieves low power and dc precision over temperature with a minimum of components. The instrumentation amplifier circuit offers many performance benefits including BiFET level input bias currents, low input offset voltage drift and only 1.2 mA quiescent current. It will operate for gains G ≥ 2, and at lower gains it will benefit from the fact that there is no output amplifier offset and noise contribution as encountered in a 3 op amp design. Good low frequency CMRR is achieved even without the optional AC CMRR trim (Figure 25). Table I provides resistance values for 3 common circuit gains. For other gains, use the following equations: R2 = R4 + R5 = 49.9 k Ω R1 = R3 = 49.9 k Ω 0.9 G −1 Max Value of R G = 99.8 k 0.06 G C t ≈ 1 2 π (R3) 5 × 105 Table I. Resistance Values for Various Gains Circuit Gain RG (Max Value Bandwidth (G) R1 & R3 of Trim Potentiometer) (–3 dB), Hz 10 6.34 k Ω 166 k Ω 50k 100 526 Ω 16.6 k Ω 5k 1,000 56.2 Ω 1.66 k Ω 0.5k 160 140 120 100 80 60 40 20 0 1 10 100 1k 10k FREQUENCY – Hz GAIN = 10, 0.2V p-p COMMON-MODE INPUT TYPICAL MONOLITHIC IN AMP CIRCUIT TRIMMED USING CAPACITOR Ct WITHOUT CAPACITOR C t Figure 25. Common-Mode Rejection vs. Frequency with and without Capacitor Ct 10 0% 50µs 2V 100 90 Figure 23b. Unity Gain Inverter Large Signal Pulse Response, CL = 1,000 pF 10 0% 5µS 20mV 100 90 Figure 23c. Unity Gain Inverter Small Signal Pulse Response, CL = 100 pF 10 0% 5µS 20mV 100 90 Figure 23d. Unity Gain Inverter Small Signal Pulse Response, CL = 1,000 pF |
Ähnliche Teilenummer - AD704JN |
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Ähnliche Beschreibung - AD704JN |
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