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TSM917EUKT Datasheet(PDF) 10 Page - Silicon Laboratories |
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TSM917EUKT Datasheet(HTML) 10 Page - Silicon Laboratories |
10 / 15 page TSM917 Page 10 TSM917 Rev. 1.0 Output Stage Circuitry Many conventional analog comparators can draw orders of magnitude higher supply current when switching. Because of this behavior, additional power supply bypass capacitance may be required to provide additional charge storage during switching. The design of the TSM917’s rail-to-rail output stage implements a technique that virtually eliminates supply-current surges when output transitions occur. As shown on Page 4 of the Typical Operating Characteristics, the supply-current change as a function of output transition frequency exhibited by this analog comparator family is very small. Material benefits of this attribute to battery- power applications are the increase in operating time and in reducing the size of power-supply filter capacitors. TSM917’s Internal +1.245V VREF The TSM917’s internal +1.245V voltage reference exhibits a typical temperature coefficient of 95ppm/°C over the full -40°C to +85°C temperature range. An equivalent circuit for the reference section is illustrated in Figure 1. Since the output impedance of the voltage reference is typically 200k Ω, its output can be bypassed with a low-leakage capacitor and is stable for any capacitive load. An external buffer – such as the TS1001 – can be used to buffer the voltage reference output for higher output current drive or to reduce reference output impedance. APPLICATIONS INFORMATION Low-Voltage, Low-Power Operation Because it was designed specifically for any low- power, battery-operated application, the TSM917 analog comparator is an excellent choice. Under nominal conditions, approximate operating times for this analog comparator is illustrated in Table 1 for a number of battery types and their corresponding charge capacities. Internal Hysteresis As a result of circuit noise or unintended parasitic feedback, many analog comparators often break into oscillation within their linear region of operation especially when the applied differential input voltage approaches 0V (zero volt). Externally-introduced hysteresis is a well-established technique to stabilizing analog comparator behavior and requires external components. As shown in Figure 2, adding comparator hysteresis creates two trip points: VTHR (for the rising input voltage) and VTHF (for the falling input voltage). The hysteresis band (VHB) is defined as the voltage difference between the two trip points. When a comparator’s input voltages are equal, hysteresis effectively forces one comparator input to Figure 1: TSM917’s Internal VREF Output Equivalent Circuit Table 1: Battery Applications using the TSM917 BATTERY TYPE RECHARGEABLE VFRESH (V) VEND-OF-LIFE (V) CAPACITY, AA SIZE (mA-h) TSM917 OPERATING TIME (hrs) Alkaline (2 Cells) No 3.0 1.8 2000 2.5 x 106 Nickel-Cadmium (2 Cells) Yes 2.4 1.8 750 937,500 Lithium-Ion (1 Cell) Yes 3.5 2.7 1000 1.25 x 106 Nickel-Metal- Hydride (2 Cells) Yes 2.4 1.8 1000 1.25 x 106 |
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