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AD8515 Fiches technique(PDF) 11 Page - Analog Devices |
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AD8515 Fiches technique(HTML) 11 Page - Analog Devices |
11 / 16 page REV. B AD8515 –11– FUNCTIONAL DESCRIPTION The AD8515, offered in space-saving SOT-23 and SC70 pack- ages, is a rail-to-rail input and output operational amplifier that can operate at supply voltages as low as 1.8 V. This product is fabricated using 0.6 micron CMOS to achieve one of the best power consumption to speed ratios (i.e., bandwidth) in the industry. With a small amount of supply current (less than 400 mA), a wide unity gain bandwidth of 4.5 MHz is available for signal processing. The input stage consists of two parallel, complementary, differential pairs of PMOS and NMOS. The AD8515 exhibits no phase rever- sal as the input signal exceeds the supply by more than 0.6 V. Currents into the input pin must be limited to 5 mA or less by the use of external series resistance(s). The AD8515 has a very robust ESD design and can stand ESD voltages of up to 4,000 V. Power Consumption vs. Bandwidth One of the strongest features of the AD8515 is the bandwidth stability over the specified temperature range while consuming small amounts of current. This effect is shown in TPC 1 through TPC 3. This product solves the speed/power requirements for many applications. The wide bandwidth is also stable even when operated with low supply voltages. TPC 4 shows the relationship between the supply voltage versus the bandwidth for the AD8515. The AD8515 is ideal for battery-powered instrumentation and handheld devices since it can operate at the end of discharge voltage of most popular batteries. Table I lists the nominal and end of discharge voltages of several typical batteries. Table I. Typical Battery Life Voltage Range End of Discharge Battery Nominal Voltage (V) Voltage (V) Lead-Acid 2 1.8 Lithium 2.6–3.6 1.7–2.4 NiMH 1.2 1 NiCd 1.2 1 Carbon-Zinc 1.5 1.1 DRIVING CAPACITIVE LOADS Most amplifiers have difficulty driving large capacitive loads. Additionally, higher capacitance at the output can increase the amount of overshoot and ringing in the amplifier’s step response and could even affect the stability of the device. This is due to the degradation of phase margin caused by additional phase lag from the capacitive load. The value of capacitive load that an amplifier can drive before oscillation varies with gain, supply voltage, input signal, temperature, and other parameters. Unity gain is the most challenging configuration for driving capacitive loads. The AD8515 is capable of driving large capacitive loads without any external compensation. The graphs in Figures 1a and 1b show the amplifier’s capacitive load driving capability when configured in unity gain of +1. The AD8515 is even capable of driving higher capacitive loads in inverting gain of –1, as shown in Figure 2. TIME (1 s/DIV) 0 0 0 00 0 0000 0 000 0 0 0 0 0 0 VS = 2.5V CL = 50pF GAIN = +1 Figure 1a. Capacitive Load Driving @ CL = 50 pF TIME (1 s/DIV) 0 0 0 00 0 0000 0 000 0 0 0 0 0 0 VS = 2.5V CL = 500pF GAIN = +1 Figure 1b. Capacitive Load Driving @ CL = 500 pF TIME (1 s/DIV) 0 0 0 00 0 0000 0 000 0 0 0 0 0 0 VS = 0.9V CL = 800pF GAIN = –1 Figure 2. Capacitive Load Driving @ CL = 800 pF |
Numéro de pièce similaire - AD8515 |
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Description similaire - AD8515 |
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