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TC820CPL датащи(PDF) 12 Page - TelCom Semiconductor, Inc |
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TC820CPL датащи(HTML) 12 Page - TelCom Semiconductor, Inc |
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12 / 22 page ![]() 3-160 TELCOM SEMICONDUCTOR, INC. 3-3/4 A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE TC820 In systems where common-mode voltages exist, the 86dB common-mode rejection ratio minimizes error. Com- mon-mode voltages do, however, affect the integrator out- put level. A worst-case condition exists if a large, positive VCM exists in conjunction with a full-scale, negative differen- tial signal. The negative signal drives the integrator output positive along with VCM (Figure 9). For such applications, the integrator output swing can be reduced below the recom- mended 2V full-scale swing. The integrator output will swing within 0.3V of VDD or VDD without increased linearity error. Reference (VDD, VSS) The TC820 reference, like the analog signal input, has true differential inputs. In addition, the reference voltage can be generated anywhere within the power supply voltage of the converter. The differential reference inputs permit ratiometric measurements and simplify interfacing with sen- sors, such as load cells and temperature sensors. DP3 DP2 DP1 0Hz – 3999Hz 4kHz – 39.99kHz 40kHz – 399.9kHz 400kHz ≥ DP3 DP2 DP1 NONE DECIMAL POINT fIN Figure 5. TC820 Auto-Range Decimal Point Selection vs Frequency Counter Input HIGH LOW LCD DRIVERS DISABLE A/D CONVERTER TO BUZZER DP0/LO DP1/HI LOGIC CMOS LOGIC LEVELS EXTERNAL LOGIC LEVEL DETECTION AND PULSE STRETCHING VDD TC820 LOGIC PROBE INPUT NC LCD Figure 6. Logic Probe Simplified Schematic |
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