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AD85531 Datasheet(PDF) 8 Page - Analog Devices |
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AD85531 Datasheet(HTML) 8 Page - Analog Devices |
8 / 10 page AD8253 Preliminary Technical Data Rev. prA | Page 8 of 10 THEORY OF OPERATION 10kΩ 10kΩ 10kΩ 10kΩ REF OUTPUT A3 –IN +IN WR 2.2kΩ 2.2kΩ +VS +VS –VS –VS +VS –VS +VS –VS A1 A0 2.2kΩ DGND A1 A2 DIGITAL GAIN CONTROL 2.2kΩ +VS –VS +VS –VS +VS –VS +VS –VS Figure 5. Simplified Schematic The AD8253 is a monolithic instrumentation amplifier based on the classic, three op amp topology as shown in Figure 5. It is fabricated on the Analog Devices, Inc. proprietary iCMOS process that provides precision, linear performance ,and a robust digital interface. A parallel interface allows users to digitally program gains of 1, 10, 100, and 1000. Gain control is achieved by switching resistors in an internal, precision, resistor array (as shown in Figure 5). Although the AD8253 has a voltage feed- back topology, gain bandwidth product increases for gains of 1, 10, and 100 because each gain has its own frequency compensation. This results in maximum bandwidth at higher gains. All internal amplifiers employ distortion cancellation circuitry and achieve high linearity and ultralow THD. Laser trimmed resistors allow for a maximum gain error of less than 0.03% for G = 1, and minimum CMRR of 120 dB for G = 1000. A pinout optimized for high CMRR over frequency enables the AD8253 to offer CMRR over frequency of 80 dB at 50 kHz (G = 1). The balanced input reduces the parasitics that, in the past, had adversely affected CMRR performance. GAIN SELECTION This section shows users how to configure the AD8253 for basic operation. Logic low and Logic high voltage limits are listed in the Specifications section. Typically, logic low is 0 V and logic high is 5 V; both voltages are measured with respect to DGND. Refer to the specifications table (Table 2) for the permissible voltage range of DGND. The gain of the AD8253 can be set using two methods. Transparent Gain Mode The easiest way to set the gain is to program it directly via a logic high or logic low voltage applied to A0 and A1. Figure 6 shows an example of this gain setting method, referred to through- out the data sheet as transparent gain mode. Tie WR to the negative supply to engage transparent gain mode. In this mode, any change in voltage applied to A0 and A1 from logic low to logic high, or vice versa, immediately results in a gain change. Table 5 is the truth table for transparent gain mode and Figure 6 shows the AD8253 configured in transparent gain mode. Figure 6. Transparent Gain Mode, A0 and A1 = High, G = 1000 |
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