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ES5117Q Datasheet(PDF) 5 Page - Cyrustek corporation |
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ES5117Q Datasheet(HTML) 5 Page - Cyrustek corporation |
5 / 10 page 03/07/21 5 ES5117 3 1/2 DVM with LED Display and Hold Function Description 1. Analog Common The COMMON pin is used to set the common-mode voltage for the system which the input signals are floating. In most of the applications, IN LO, REF LO and COMMON pins are usually connected. It can remove common-mode voltage concerns. In other applications, INLO does not connect with COMMON. The ES5117 generates a common mode voltage, which has the high CMRR (86dB typical). Nevertheless, it should be care to prevent the output of the integrator form saturation. The COMMON pin is also used as a voltage reference. It outputs a voltage, which is around 2.9 volts below the positive supply. The COMMON voltage has a low output impedance of 15Ω typically. The analog COMMON is connected internally to a NMOS, which can sink 30mA. This NMOS will hold the COMMON voltage at 2.9 volts when an external load attempts to pull the COMMON voltage toward the positive supply. The source current of COMMON is only 10uA, so it is easy to pull COMMON voltage to a more negative voltage. When the total supply voltage is large enough to cause the zener to regulate (>7V), the COMMON voltage will have a low temperature coefficient less than 60ppm/℃ typically. The voltage can be used to generate the reference voltage. 2. Reference Voltage For a 1000 counts reading, the input signal must be equal to the reference voltage. As a result, it requires the input signal be twice the reference voltage for a 2000 counts full- scale reading. Thus, for the 200.0mV and 2.000V full-scale, the reference voltage should equal 100.0mV and 1.000V. In some applications the full-scale input voltage may be different to 200mV or 2.000V. For example, in the 600mV full-scale applications, the reference voltage should be set to 300mV. The differential reference should be used during the measurement of resistor by the ratio-metric method and when a digital reading of zero is desired for Vin≠0, a compensating offset voltage can be applied between COMMON and IN LO, and the voltage of being measured is connected between COMMON and IN HI. |
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