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MAX9026EBT Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX9026EBT Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 14 page UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference 10 ______________________________________________________________________________________ Reference (MAX9025/MAX9026) The MAX9025–MAX9028s’ internal +1.236V reference has a typical temperature coefficient of 40ppm/°C over the full -40°C to +85°C temperature range. The reference is a very-low-power bandgap cell, with a typical 35kΩ output impedance. REF can source and sink up to 100nA to external circuitry. For applications needing increased drive, buffer REF with a low input-bias current op amp such as the MAX4162. Most applications require no REF bypass capacitor. For noisy environments or fast VCC transients, connect a 1nF to 10nF ceramic capacitor from REF to GND. Applications Information Low-Voltage, Low-Power Operation The MAX9025–MAX9028 are ideally suited for use with most battery-powered systems. Table 1 lists a variety of battery types, capacities, and approximate operating times for the MAX9025–MAX9028, assuming nominal conditions. Internal Hysteresis Many comparators oscillate in the linear region of opera- tion because of noise or undesired parasitic feedback. This tends to occur when the voltage on one input is equal or very close to the voltage on the other input. The MAX9025–MAX9028 have internal 4mV hysteresis to counter parasitic effects and noise. The hysteresis in a comparator creates two trip points: one for the rising input voltage (VTHR) and one for the falling input voltage (VTHF) (Figure 2). The difference between the trip points is the hysteresis (VHB). When the comparator’s input voltages are equal, the hystere- sis effectively causes one comparator input to move quickly past the other, thus taking the input out of the region where oscillation occurs. Figure 2 illustrates the case in which IN- has a fixed voltage applied, and IN+ is varied. If the inputs were reversed, the figure would be the same, except with an inverted output. Adding External Hysteresis In applications requiring more than the internal 4mV hysteresis of the MAX9025–MAX9028, additional hys- teresis can be added with external components. Because the MAX9025–MAX9028 are intended for very low-power systems, care should be taken to minimize power dissipation in the additional circuitry. Regardless of which approach is taken, the external hysteresis will be VCC dependent. Over the full discharge range of battery-powered systems, the hysteresis can change as much as 40%. This must be considered during design. BANDGAP REF VEE VCC Figure 1. MAX9025/MAX9026 Voltage Reference Output Equivalent Circuit Table 1. Battery Applications Using MAX9025–MAX9028 BATTERY TYPE RECHARGEABLE VFRESH (V) VEND-OF-LIFE (V) CAPACITY, AA SIZE (mA-H) MAX9025/MAX9026 OPERATING TIME (hr) MAX9027/MAX9028 OPERATING TIME (hr) Alkaline (2 Cells) No 3.0 1.8 2000 1.8 x 10 6 2.8 x 10 6 Nickel- Cadmium (2 Cells) Yes 2.4 1.8 750 680,000 1.07 x 10 6 Lithium-Ion (1 Cell) Yes 3.5 2.7 1000 0.9 x 10 6 1.4 x 10 6 Nickel-Metal- Hydride (2 Cells) Yes 2.4 1.8 1000 0.9 x 10 6 1.4 x 10 6 |
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