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AD743JR-16 Datasheet(PDF) 11 Page - Analog Devices |
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AD743JR-16 Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page REV. E AD743 –11– R2 1900 R4* R1 108 R3 100 OUTPUT AD743 *OPTIONAL, SEE TEXT INPUT SENSITIVITY = –179 dB re. 1V/ Pa** **1V PER MICROPASCAL B AND K TYPE 8100 HYDROPHONE CT CC C1* Figure 15b. AC-Coupled, Low Noise Hydrophone Amplifier R5 100k R1 108 R4* 108 OUTPUT DC OUTPUT 1mV FOR IB (AD743) 100nA CT C1* AD743 R2 1900 R6 1M R7 16M 16M *OPTIONAL, SEE TEXT C2 0.27 F R3 100 B AND K TYPE 8100 HYDROPHONE AD711K Figure 15c. Hydrophone Amplifier Incorporating a DC Servo Loop where the dc gain is 1 and the gain above the low frequency cutoff (1/(2 πC C(100 Ω))) is the same as the circuit of Figure 15a. The circuit of Figure 15c uses a dc servo loop to keep the dc output at 0 V and to maintain full dynamic range for IB up to 100 nA. The time constant of R7 and C2 should be larger than that of R1 and CT for a smooth low frequency response. The transducer shown has a source capacitance of 7500 pF. For smaller transducer capacitances ( ≤300 pF), the lowest noise can be achieved by adding a parallel RC network (R4 = R1, C1 = CT) in series with the inverting input of the AD743. BALANCING SOURCE IMPEDANCES As mentioned previously, it is good practice to balance the source impedances (both resistive and reactive) as seen by the inputs of the AD743. Balancing the resistive components will optimize dc performance over temperature because balancing will mitigate the effects of any bias current errors. Balancing input capacitance will minimize ac response errors due to the amplifier’s input capacitance and, as shown in Figure 16, noise performance will be optimized. Figure 17 shows the required external components for noninverting (A) and inverting (B) configurations. INPUT CAPACITORS (pF) 40 30 20 10 10 100 1000 UNBALANCED BALANCED 2.9nV/ √Hz Figure 16. RTI Voltage Noise vs. Input Capacitance OUTPUT R1 R2 RB CB CS RS NONINVERTING CONNECTION A A CB = CS RB = RS FOR RS >> R1 OR R2 OUTPUT R1 CS CF CB RS RB INVERTING CONNECTION B B CB = CF CS RB = R1 RS Figure 17. Optional External Components for Balancing Source Impedances |
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