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AME7107A Datasheet(PDF) 8 Page - Analog Microelectronics |
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AME7107A Datasheet(HTML) 8 Page - Analog Microelectronics |
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8 / 20 page  AME, Inc. 8 AME7106/AME7106A/AME7106R AME7107/AME7107A/AME7107R 3-1/2 Digit A/D Converter High Accuracy, Low Power The A/D conversion has the following three phases: 1. Auto-Zero Phase 2. Integration Phase 3. De-integration Phase Auto-Zero Phase The INHI and INLO are shorted to analog common in- ternally. The reference capacitor is charged to the ref- erence voltage. A feedback loop is closed around the system to cancel the offset voltage of buffer, integrator and comparator. Signal Integration phase The converter integrates the differential voltage across the INHI and INLO for a fixed time, 1000 system clocks. The polarity of the signal is determined at the end of this phase. Reference Integration Phase INLO is internally connected to the Analog Common, INHI is connected across the reference capacitor with appropriate polarity determined by the control circuit. The integrator output will then return to zero. The time it takes to return to zero, 1000 X VIN /VREF, is the digital representation of the analog signal. Differential Signal Inputs (INHI & INLO) The AME7106/AME7107 has true differential inputs and accepts input signals within the input common mode voltage range (Vcm). Typical range is from 1V above the V- to 1V below the V+. The integrator output can swing within 0.3 V of V+ or V- without increasing linearity errors. Care must be exercised to make sure the integrator output does not saturate. In a typical application, the common mode is eliminated by con- necting the INLO to COM, Analog Common. Differential Reference (VREF+ & VREF-) The reference voltage can be generated anywhere within the V+ to V-. Under a large common mode volt- age, reference capacitor can gain charge during the de-integration of a positive signal. The reference ca- pacitor will lose charge when de-integrating a negative input signal. The difference in reference voltage for positive or negative input voltages can cause the rollover error. To prevent rollover error from being in- duced by large common-mode voltages, reference ca- pacitor should be large compared to stray node capaci- tance. Analog Common (COM) The Analog Common is to set a common mode volt- age for the analog signal. The analog common is typi- cally 3.0V below V+, set primary for the battery oper- ated application. Analog common is capable to sink 20 mA. It’s source current is limited to 10 µA. Analog common is therefore easily pulled to a more negative voltage to override the internal reference. When sup- ply voltage is greater than 7V, analog common can be used as reference source with temperature coefficient of typically 50 ppm/OC. The internal heating by the LED display drivers of the AME7107 may degrade the sta- bility of the Analog Common. An external reference is recommended. |
Número de pieza similar - AME7107A |
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Descripción similar - AME7107A |
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