REF200 PDF

Now, Maxim Integrated Products, Inc. MXIM has introduced a solid-state blood-pressure monitoring solution to more conveniently track this critical health indicator. It enables users to place their finger on a device for seconds while resting to measure blood pressure anywhere and anytime. This integrated optical design and lenses-on-top approach enables optimal signal-to-noise ratio SNR for a small, lower cost and power-efficient module. It comes in a tiny 5. The MAXD sensor hub IC includes firmware which controls the sensor and executes the algorithms which measure cuffless blood pressure, heart rate and blood-oxygen levels.

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The three circuit sections of the REF are electrically isolated from one another using a dielectrically isolated fabrication process. A substrate connection is provided pin 6 , which is isolated from all circuitry. This pin should be connected to a defined circuit potential to assure rated DC performance.

The preferred connection is to the most nega- tive constant potential in your system. In most analog systems this would be —V S. For best AC performance, leave pin 6 open and leave unused sections unconnected. The upper and lower current extremes measured over temperature define the top and bottom of the box.

The sides are determined by the specified temperature range of the device. If the current sources are subjected to reverse voltage, a protection diode may be required. A parallel diode Figure 2a will protect the device by limiting the reverse voltage across the current source to approximately 0. In some applica- tions, a series diode may be preferable Figure 2b because it allows no reverse current. This will, however, reduce the compliance voltage range by one diode drop.

Applications for the REF are limitless. A collection of circuits is shown to illustrate some techniques. Also, see ABA. Reverse Voltage Protection.

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