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TC500ACOE Scheda tecnica(PDF) 6 Page - TelCom Semiconductor, Inc |
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TC500ACOE Scheda tecnica(HTML) 6 Page - TelCom Semiconductor, Inc |
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6 / 17 page  3-24 TELCOM SEMICONDUCTOR, INC. Figure 2. Basic Dual-Slope Converter PHASE CONTROL COMPARATOR INTEGRATOR CINT ANALOG INPUT (VIN) SWITCH DRIVER REF VOLTAGE CONTROL LOGIC POLARITY CONTROL S1 I/O TIMER COUNTER ROM RAM MICROCOMPUTER AB CMPTR OUT VSUPPLY ± TINT TC510 VINT VIN VFULL SCALE VIN 1/2 VFULL SCALE TDEINT – + RINT VINT – + PIN DESCRIPTION (Cont.) Pin No Pin No Pin No (TC500/A) (TC510) (TC514) Symbol Description 10 CH4– Negative analog input pin. MUX channel 4 20 A0 Multiplexer input channel select input LSB. (See A1). 19 A1 Multiplexer input channel select input MSB. 00 = Channel 1 Phase control input pins: A1, A0 = 01 = Channel 2 10 = Channel 3 11 = Channel 4 GENERAL THEORY OF OPERATION Dual-Slope Conversion Principles (Figure 2) Actual data conversion is accomplished in two phases: input signal Integration and reference voltage Deintegration. The integrator output is initialized to 0V prior to the start of Integration. During Integration, analog switch S1 con- nects VIN to the integrator input where it is maintained for a fixed time period (tINT). The application of VIN causes the integrator output to depart 0V at a rate determined by the magnitude of VIN, and a direction determined by the polarity of VIN. The Deintegration phase is initiated immediately at the expiration of tINT. During Deintegration, S1 connects a reference voltage (having a polarity opposite that of VIN) to the integrator input. At the same time, an external precision timer is started. The Deintegration phase is maintained until the comparator output changes state, indicating the integrator has returned to its starting point of 0V. When this occurs, the precision timer is stopped. The Deintegration time period (tDEINT), as measured by the precision timer, is directly proportional to the magnitude of the applied input voltage. A simple mathematical equation relates the Input Signal, Reference Voltage and Integration time: PRECISION ANALOG FRONT ENDS TC500 TC500A TC510 TC514 |
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