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AD620AR-REEL Datasheet(PDF) 15 Page - Analog Devices |
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AD620AR-REEL Datasheet(HTML) 15 Page - Analog Devices |
15 / 20 page AD620 Rev. G | Page 15 of 20 3k Ω 5V DIGITAL DATA OUTPUT ADC REF IN AGND 20k Ω 10k Ω 20k Ω AD620B G = 100 1.7mA 0.10mA 0.6mA MAX 499 Ω 3k Ω 3k Ω 3k Ω 2 1 8 3 7 6 5 4 1.3mA MAX AD705 Figure 40. A Pressure Monitor Circuit that Operates on a 5 V Single Supply Pressure Measurement Although useful in many bridge applications, such as weigh scales, the AD620 is especially suitable for higher resistance pressure sensors powered at lower voltages where small size and low power become more significant. Figure 40 shows a 3 kΩ pressure transducer bridge powered from 5 V. In such a circuit, the bridge consumes only 1.7 mA. Adding the AD620 and a buffered voltage divider allows the signal to be conditioned for only 3.8 mA of total supply current. Small size and low cost make the AD620 especially attractive for voltage output pressure transducers. Since it delivers low noise and drift, it will also serve applications such as diagnostic noninvasive blood pressure measurement. Medical ECG The low current noise of the AD620 allows its use in ECG monitors (Figure 41) where high source resistances of 1 MΩ or higher are not uncommon. The AD620’s low power, low supply voltage requirements, and space-saving 8-lead mini-DIP and SOIC package offerings make it an excellent choice for battery- powered data recorders. Furthermore, the low bias currents and low current noise, coupled with the low voltage noise of the AD620, improve the dynamic range for better performance. The value of capacitor C1 is chosen to maintain stability of the right leg drive loop. Proper safeguards, such as isolation, must be added to this circuit to protect the patient from possible harm. G = 7 AD620A 0.03Hz HIGH- PASS FILTER OUTPUT 1V/mV +3V –3V RG 8.25k Ω 24.9k Ω 24.9k Ω AD705J G = 143 C1 1M Ω R4 10k Ω R1 R3 R2 OUTPUT AMPLIFIER PATIENT/CIRCUIT PROTECTION/ISOLATION Figure 41. A Medical ECG Monitor Circuit |
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