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LTC6087CDD-PBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC6087CDD-PBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  LTC6087/LTC6088 10 60878fb APPLICATIONS INFORMATION Rail-to-Rail Output The output stage of the LTC6087/LTC6088 swings within 30mV of the supply rails when driving high impedance loads, in other words when no DC load current is present. See the Typical Performance Characteristics for curves of output swing versus load current. The class AB design of the output stage enables the op amp to supply load cur- rents which are much greater than the quiescent supply current. For example, the room temperature short circuit current is typically 45mA. Capacitive Load LTC6087/LTC6088 can drive capacitive load up to 100pF in unity gain. The capacitive load driving capability increases as the amplifier is used in higher gain configurations. A small series resistance between the output and the load further increases the amount of capacitance the amplifier can drive. SHDN Pins Pins 5 and 6 are used for power shutdown when the LTC6087 is in the DD package. If they are floating, internal current sources pull Pins 5 and 6 to V+ and the amplifiers operate normally. In shutdown the amplifier output is high impedance and each amplifier draws less than 5μA current. This feature allows the part to be used in muxed output applications as shown in Figure 3. ESD The LTC6087/LTC6088 has reverse-biased ESD protection diodes on all inputs and outputs as shown in the Simplified Schematic. If these pins are forced beyond either supply, unlimited current will flow through these diodes. If the current is transient and limited to one hundred milliamps or less, no damage to the device will occur. The amplifier input bias current is the leakage current of these ESD diodes. This leakage is a function of the tem- perature and common mode voltage of the amplifier, as shown in the Typical Performance Characteristics. Noise In the frequency region above 1kHz, the LTC6087/LTC6088 shows good noise voltage performance. In this region, noise can be dominated by the total source resistance of the particular application. Specifically, these amplifiers exhibit the noise of a 10k resistor, meaning it is desirable to keep the source and feedback resistance at or below this value, i.e., RS + RG||RFB ≤ 10k. Above this total source impedance, the noise voltage is dominated by the resistor. At low frequency, noise current can be estimated from the expression in = √2qIB, where q = 1.6 • 10–19 coulombs. Equating √4kTRΔf and R√2qIBΔf shows that for source resistor below 50G Ω the amplifier noise is dominated by the source resistance. Noise current rises with frequency. See the curve Noise Current vs Frequency in the Typical Performance Characteristics section. Figure 3. Inverting Amplifier with Muxed Output – + 10k 10k 10k 10k 10pF 10pF OUT LTC6087 (DD PACKAGE) SEL = 5V, OUT = –INA SEL = 0V, OUT = –1NB 10k 10k SHDN A SHDN B FAIRCHILD NC7SZ04 OR EQUIVALENT 5V A 5V INA 5V 10k 10k 5V 60878 F03 INB SEL – + B |
Similar Part No. - LTC6087CDD-PBF |
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Similar Description - LTC6087CDD-PBF |
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