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AD704ARZ-16 Datenblatt(PDF) 11 Page - Analog Devices |
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AD704ARZ-16 Datenblatt(HTML) 11 Page - Analog Devices |
11 / 16 page AD704 Rev. E | Page 11 of 16 THEORY OF OPERATION –VIN +VIN OUTPUT +VS 0.1µF –VS 0.1µF Ct C2 C1 R3 6.34k Ω RG GAIN TRIM (500k Ω POT) R4 47.5k Ω R5 2.4k Ω R1 6.34k Ω R2 49.9k Ω R6 1M Ω R10, 2M Ω C5, 0.01µF R7 1M Ω R8 1M Ω 1/4 AD704 1/4 AD704 1/4 AD704 C4 C3 R11, 2M Ω C6, 0.01µF R9 1M Ω 1/4 AD704 DC CMRR TRIM (5k Ω POT) OPTIONAL AC CMRR TRIM OPTIONAL BALANCE RESISTOR NETWORKS CAN BE REPLACED WITH A SHORT. NOTES 1. INSTRUMENTATION AMPLIFIER GAIN = 1 + + (FOR R1 = R3, R2 = R4 + R5). 2. CAPACITORS C2 AND C4 ARE SOUTHERN ELECTRONICS MPCC, POLYCARBONATE, ±5%, 50V. 3. ALL RESISTORS METAL FILM, 1%. R2 R1 2R2 RG Q1 = C1 4C2 ω = 1 R6 C1C2 R6 = R7 Q2 = C3 4C4 ω = 1 R8 C3C4 R8 = R9 Figure 34. Gain-of-10 Instrumentation Amplifier with Post Filtering The instrumentation amplifier with post filtering (see Figure 34) combines two applications that 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 operates for gains that are G ≥ 2 and, at lower gains, it benefits from no output amplifier offset and no noise contribution as encountered in a 3-op-amp design. Good low frequency CMRR is achieved even without the optional ac CMRR trim (see Figure 35). Table 4 provides resistance values for three common circuit gains. For other gains, use the following equations: 5 10 5 ) ( π 2 1 06 . 0 k 8 . 99 1 9 . 0 k 9 . 49 k 9 . 49 × ≈ Ω = − Ω = = Ω = + = R3 C G R of Value Max G R3 R1 R5 R4 R2 t G Table 4. Resistance Values for Various Gains Circuit Gain (G) R1 and R3 RG (Max Value of Trim Potentiometer) Bandwidth (−3 dB), Hz 10 6.34 kΩ 166 kΩ 50 k 100 526 Ω 16.6 kΩ 5k 1000 56.2 Ω 1.66 kΩ 0.5 k 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 WITHOUT CAPACITOR Ct CIRCUIT TRIMMED USING CAPACITOR Ct Figure 35. Common-Mode Rejection vs. Frequency with and Without Capacitor Ct |
Ähnliche Teilenummer - AD704ARZ-16 |
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Ähnliche Beschreibung - AD704ARZ-16 |
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