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AD22050 bảng dữ liệu(PDF) 3 Page - Analog Devices |
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AD22050 bảng dữ liệu(HTML) 3 Page - Analog Devices |
3 / 8 page AD22050 –3– REV. C ABSOLUTE MAXIMUM RATINGS* Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . +3.0 V to +36 V Peak Input Voltage (40 ms) . . . . . . . . . . . . . . . . . . . . . . +60 V VOFS (Pin 7 to Pin 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20 V Reversed Supply Voltage Protection . . . . . . . . . . . . . . . –34 V Operating Temperature . . . . . . . . . . . . . . . . –40 °C to +125°C Storage Temperature . . . . . . . . . . . . . . . . . . –65 °C to +150°C Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300 °C *Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only; the functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. PIN CONFIGURATIONS Plastic Mini-DIP Package (N-8) Plastic SOIC Package (SO-8) CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD22050 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. PRODUCT DESCRIPTION The AD22050 is a single-supply difference amplifier consisting of a precision balanced attenuator, a very low drift preamplifier and an output buffer amplifier (A1 and A2, respectively, in Figure 2). It has been designed so that small differential sig- nals (VDM in Figure 3) can be accurately amplified and filtered in the presence of large common-mode voltages (VCM) without the use of any other active components. AD22050 OUT GND IN+ IN– +VS OFS A1 A2 A1 A2 Figure 2. Simplified Schematic The resistive attenuator network is situated at the input to the AD22050 (Pins 1 and 8), allowing the common-mode voltage at Pins 1 and 8 to be six times greater than that which can be toler- ated by the actual input to A1. As a result, the input common- mode range extends to 6 × (V S – 1 V). Two small filter capacitors (not shown in Figure 2) have been included at the inputs of A1 to minimize the effects of any spuri- ous RF signals present in the signal. Internal feedback around A1 sets the closed-loop gain of the preamplifier to ×10 from the input pins; the output of A1 is connected to Pin 3 via a 100 k Ω resistor, which is trimmed to ±3% (R12 in Figure 2) to facilitate the low-pass filtering of the signal of interest (see Low-Pass Filtering section). The inclusion of an additional resistive network allows the output of A1 to be offset to an optional voltage of one half of that supplied to Pin 7; in many cases this offset would be +VS/2 by tying Pin 7 to +VS (Pin 6), permitting the conditioning and processing of bipolar signals (see Strain Gage Interface section). The output buffer A2 has a gain of ×2, setting the precalibrated, overall gain of the AD22050, with no external components, to ×20. (This gain is easily user-configurable—see Altering the Gain section for details.) The dynamic properties of the AD22050 are optimized for interfacing to transducers; in particular, current sensing shunt resistors. Its rejection of large, high frequency, common-mode signals makes it superior to that of many alternative approaches. This is due to the very careful design of the input attenuator and the close integration of this highly balanced, high impedance system with the preamplifier. APPLICATIONS The AD22050 can be used wherever a high gain, single-supply differencing amplifier is required, and where a finite input resis- tance (240 k Ω to ground, 400 kΩ between differential inputs) can be tolerated. In particular, the ability to handle a common- mode input considerably larger than the supply voltage is fre- quently of value. Also, the output can run down to within 20 mV of ground, provided it is not called on to sink any load current. Finally, the output can be offset to half of a full-scale reference voltage (with a tolerance of ±2%) to allow a bipolar input signal. ALTERING THE GAIN The gain of the preamplifier, from the attenuator input (Pins 1 and 8) to its output at Pin 3, is ×10 and that of the output buffer, from Pin 4 to Pin 5, is ×2, thus making the overall de- fault gain ×20. The overall gain is accurately trimmed (to within ±0.5%). In some cases, it may be desirable to provide for some variation in the gain; for example, in absorbing the scaling error of a transducer. Figure 3 shows a general method for trimming the gain, either upward or downward, by an amount dependent on the resistor, R. The gain range, expressed as a percentage of the overall gain, WARNING! ESD SENSITIVE DEVICE TOP VIEW (Not to Scale) 8 7 6 5 1 2 3 4 –IN GND A1 +IN OFFSET +VS OUT A2 AD22050 TOP VIEW (Not to Scale) 8 7 6 5 1 2 3 4 –IN GND A1 A2 +IN OFFSET +VS OUT AD22050 |
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