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TC850IJL Datasheet(PDF) 9 Page - Microchip Technology |
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TC850IJL Datasheet(HTML) 9 Page - Microchip Technology |
9 / 26 page © 2006 Microchip Technology Inc. DS21479C-page 9 TC850 4.0 ANALOG SECTION DESCRIPTION The TC850 analog section consists of an input buffer amplifier, integrator amplifier, comparator and analog switches. A simplified block diagram is shown in Figure 4-1. 4.1 Conversion Timing Each conversion consists of three phases: 1. Zero Integrator 2. Signal Integrate 3. Reference Integrate (or De-integrate) Each conversion cycle requires 1280 internal clock cycles (Figure 4-2). FIGURE 4-1: Analog Section Simplified Schematic FIGURE 4-2: Conversion Timing RINT INTIN INTOUT CINT INT INT INT Buffer* BUFF Integrator* Comparator* To Digital Section DE1 (+) DE DE DE Z1 DE DE1 (+) DE1 (-) DE1 (-) DE2 (+) DE2 (-) DE1 (+) DE1 (-) REF2+ + - + – + – TC850 CREF1+ CREF2- CREF2 CREF1- CREF2- REF1+ REF1- CREF1 IN+ IN- ANALOG COMMON *Auto Zeroed Amplifiers Conversion Phase Internal Clock Signal Integrate Zero Integrator Reference Integrate 1280 Clock Cyles 246 256 778 . . . . . . . . . . . . . . . . . . . . . |
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