By Charles Kitchin, Lew Counts
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Extra resources for A Designer's Guide to Instrumentation Amplifiers, 2nd Edition
Figure 5-2 shows just such an arrangement. Here, the input bias currents quickly charge up capacitors C1 and C2 until the in-amp’s output “rails,” either to the supply or ground. This means that for each chip a bypass capacitor should be connected between each power supply pin and the point on the board where the in-amp’s reference terminal is connected, as shown in Figure 5-1. 5-1 �� ��� �� ��� ������ �� ���� ������� ���� ��� ����� Figure 5-2. An AC-Coupled In-Amp Circuit Without an Input Ground Return ���� The solution is to add a high value resistance (R1, R2) between each input and ground, as shown in Figure 5-3.
Gain and frequency. The AD623 is an instrumentation amplifier based on the 3-op amp in-amp circuit, modified to ensure operation on either single- or dual-power supplies, even at common-mode voltages at, or even below, the negative supply rail (or below ground in single-supply operation). Other features include rail-to-rail output voltage swing, low supply current, microsmall outline packaging, low input and output voltage offset, microvolt/dc offset level drift, high common-mode rejection, and only one external resistor to set the gain.
For a gain of 10, Pin 7 is simply left unconnected; similarly, for a gain of 100, Pin 7 is grounded. Gains between 10 and 100 are easily set by connecting a resistor between Pin 7 and analog GND. 1%), at least a 20% adjustment range must be provided. The nominal value for this gain setting resistor is equal to R= 50, 000 Ω − 555 Ω GAIN − 10 500mV 20s 100 90 10 0% Figure 4-9. The Large Signal Pulse Response of the AD626. G = 10 Figure 4-9 shows the large signal pulse response of the AD626.
A Designer's Guide to Instrumentation Amplifiers, 2nd Edition by Charles Kitchin, Lew Counts