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TC510 датащи(PDF) 2 Page - Microchip Technology |
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TC510 датащи(HTML) 2 Page - Microchip Technology |
2 / 28 page TC500/A/510/514 DS21428B-page 2 © 2002 Microchip Technology Inc. General Description TheTC500/A/510/514 family are precision analog front ends that implement dual slope A/D converters having a maximum resolution of 17-bits plus sign. As a mini- mum, each device contains the integrator, zero cross- ing comparator and processor interface logic. The TC500 is the base (16-bit max) device and requires both positive and negative power supplies. The TC500A is identical to the TC500 with the exception that it has improved linearity, allowing it to operate to a maximum resolution of 17-bits. The TC510 adds an on- board negative power supply converter for single sup- ply operation. The TC514 adds both a negative power supply converter and a 4 input differential analog multiplexer. Each device has the same processor control interface consisting of 3 wires: control inputs (A and B) and zero- crossing comparator output (CMPTR). The processor manipulates A, B to sequence the TC5XX through four phases of conversion: Auto Zero, Integrate, De-inte- grate and Integrator Zero. During the Auto Zero phase, offset voltages in the TC5XX are corrected by a closed loop feedback mechanism. The input voltage is applied to the integrator during the Integrate phase. This causes an integrator output dv/dt directly proportional to the magnitude of the input voltage. The higher the input voltage, the greater the magnitude of the voltage stored on the integrator during this phase. At the start of the De-integrate phase, an external voltage refer- ence is applied to the integrator and, at the same time, the external host processor starts its on-board timer. The processor maintains this state until a transition occurs on the CMPTR output, at which time the proces- sor halts its timer. The resulting timer count is the con- verted analog data. Integrator Zero (the final phase of conversion) removes any residue remaining in the integrator in preparation for the next conversion. The TC500/A/510/514 offer high resolution (up to 17- bits), superior 50Hz/60Hz noise rejection, low power operation, minimum I/O connections, low input bias currents and lower cost compared to other converter technologies having similar conversion speeds. Typical Application Level Shift Control Logic Analog Switch Control Signals ACOM VREF+ BUF CAZ Buffer Integrator SWR SWIZ CMPTR 1 CMPTR 2 CMPTR Output DGND Control Logic SW1 TC500 TC500A TC510 TC514 CREF CREF+ SWR CREF- CAZ RINT CINT CINT SWRI- SWRI- SWRI+ SWRI- SWZ SWI SWZ VSS OSC – + + – – + Phase Decoding Logic Polarity Detection DC-TO-DC Converter (TC510 & TC514) - + A B 0 0 Zero Integrator Output 0 1 Auto-Zero 1 0 Signal Integrate 1 1 Deintegrate VREF- VOUT- COUT- 1.0µF 1.0µF VSS SWI B A A0 A1 DIF. MUX (TC514) CH1+ CH2+ CH3+ CH4+ CH1- CH2- CH3- CH4- CAP- CAP+ (TC500 TC500A) Converter Sate |
Аналогичный номер детали - TC510 |
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Аналогичное описание - TC510 |
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