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AD704JR Datasheet(PDF) 8 Page - Analog Devices |
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AD704JR Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page REV. C AD704 –8– Table I. Resistance Values for Various Gains Circuit Gain RG (Max Value Bandwidth (G) R1 and 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 CIRCUIT TRIMMED USING CAPACITOR Ct WITHOUT CAPACITOR Ct TYPICAL MONOLITHIC IN AMP Figure 4. Common-Mode Rejection vs. Frequency with and without Capacitor Ct INSTRUMENTATION AMPLIFIER GAIN = 1 + + (FOR R1 = R3, R2 = R4 + R5) R2 2R2 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 OUTPUT C3 C4 R8 1M C5, 0.01 F C2 R7 1M R6 1M C1 0.1 F GAIN TRIM (500k POT) R2 49.9k R1 6.34k RG R3 6.34k OPTIONAL AC CMRR TRIM R5 2.4k R4 47.5k DC CMRR TRIM (5k POT) C t –VIN R1 RG = R8 C3C4 ω 1 R8 = R9 Q2 = C3 4C4 R6 = R7 = R6 C1C2 ω 1 Q1 = C1 4C2 R10, 2M – + – + 0.1 F +VS –VS +VIN R9 1M C6, 0.01 F R11, 2M Figure 3. Gain of 10 Instrumentation Amplifier with Post Filtering The instrumentation amplifier with post filtering (Figure 3) 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 contri- bution as encountered in a 3 op amp design. Good low frequency CMRR is achieved even without the optional ac CMRR trim (Figure 4). 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 k G G = Ω 99 8 006 . . C t ≈ 1 2 π (R3) 5 × 105 |
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