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ADS826E1KG4 bảng dữ liệu(PDF) 9 Page - Texas Instruments |
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ADS826E1KG4 bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 20 page ADS823, ADS826 SBAS070B 9 www.ti.com OPA642 V IN R F 402 Ω 1.62k Ω R G 402 Ω ADS823 ADS826 R S 24.9 Ω 1.62k Ω 100pF 0.1 µF 0.1 µF IN IN CM REFB +1.5V INT/EXT GND REFT +3.5V RSEL +V S +5V +5V –5V +V IN 0V –V IN OPA690 V IN R F 402 Ω 1.62k Ω R G 402 Ω ADS823 ADS826 R S 50 Ω 10pF 0.1 µF IN IN CM INT/EXT GND REFT +3.5V 1.62k Ω 50 Ω V CM +2.5V REFB +1.5V 0.1 µF 0.1 µF RSEL +V S +5V +5V FIGURE 2. AC-Coupled Input Configuration for a 2Vp-p Full-Scale Range and a Common-Mode Voltage, VCM, at +2.5V Derived from the Internal Top (REFT) and Bottom Reference (REFB). For applications requiring the driving amplifier to provide a signal amplification, with a gain ≥ 5, consider using decom- pensated voltage-feedback op amps, like the OPA686, or current-feedback op amps like the OPA6901. DC-Coupled with Level Shift Several applications may require that the bandwidth of the signal path includes DC, in which case the signal has to be DC-coupled to the ADC. In order to accomplish this, the interface circuit has to provide a DC level shift to the analog input signal. The circuit of in Figure 4 employs a dual op amp, A1, to drive the input of the ADS823 and ADS826, and level shift the signal to be compatible with the selected input range. With the RSEL pin tied to the supply and the INT/EXT pin to ground, the ADS823 and ADS826 are configured for a 2Vp-p input range and uses the internal references. The complementary input (IN) may be appropriately biased using the +2.5V common-mode voltage available at the CM pin. One half of amplifier A1 buffers the REFB pin and drives the voltage divider R1, R2. Due to the op amp’s noise gain of +2V/V, assuming RF = RIN, the common-mode voltage (VCM) has to be re-scaled to +1.25V. This results in the correct DC level of +2.5V for the signal input (IN). Any DC voltage differences between the IN and IN inputs of the ADS823 and ADS826 effectively produce an offset, which can be cor- rected for by adjusting the resistor values of the divider, R1 and R2. The selection criteria for a suitable op amp should include the supply voltage, input bias current, output voltage swing, distortion, and noise specification. Note that in this example the overall signal phase is inverted. To re-establish the original signal polarity, it is always possible to inter- change the IN and IN connections. FIGURE 3. AC-Coupling the Dual-Supply Amplifier OPA642 to the ADS823 and ADS826 for a 2Vp-p Full-Scale Input Range. |
Số phần tương tự - ADS826E1KG4 |
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Mô tả tương tự - ADS826E1KG4 |
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