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TC7135CLI713 Datasheet(PDF) 8 Page - Microchip Technology |
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TC7135CLI713 Datasheet(HTML) 8 Page - Microchip Technology |
8 / 24 page TC7135 DS21460C-page 8 2004 Microchip Technology Inc. 4.0 ANALOG SECTION FUNCTIONAL DESCRIPTION 4.1 Differential Inputs The TC7135 operates with differential voltages (+INPUT, pin 10 and -INPUT, pin 9) within the input amplifier Common mode range, which extends from 1V below the positive supply to 1V above the negative supply. Within this Common mode voltage range, an 86 dB Common mode rejection ratio is typical. The integrator output also follows the Common mode voltage and must not be allowed to saturate. A worst- case condition exists, for example, when a large positive Common mode voltage with a near full scale negative differential input voltage is applied. The negative input signal drives the integrator positive when most of its swing has been used up by the positive Com- mon mode voltage. For these critical applications, the integrator swing can be reduced to less than the recommended 4V full scale swing, resulting in some loss of accuracy. The integrator output can swing within 0.3V of either supply without loss of linearity. 4.2 Analog Common Input The ANALOG COMMON pin is used as the -INPUT return during auto-zero and de-integrate. If -INPUT is different from ANALOG COMMON, a Common mode voltage exists in the system. However, this signal is rejected by the excellent CMRR of the converter. In most applications, –INPUT will be set at a fixed, known voltage (power supply common, for instance). In this application, ANALOG COMMON should be tied to the same point, thus removing the Common mode voltage from the converter. The reference voltage is referenced to ANALOG COMMON. 4.3 Reference Voltage Input The reference voltage input (REF IN) must be a posi- tive voltage with respect to ANALOG COMMON. A reference voltage circuit is shown in Figure 4-1. FIGURE 4-1: Using An External Reference. MCP1525 2.5 VREF V+ 10 k Ω 10 k Ω V+ REF IN ANALOG COMMON Analog Ground TC7135 1µF |
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