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LTC6084CMS8-TRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC6084CMS8-TRPBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LTC6084/LTC6085 11 60845f APPLICATIONS INFORMATION Figure 3. Inverting Amplifier with Muxed Output – + 10k 10k 10k 10k OUT LTC6084 (DD PACKAGE) SEL = 5V, OUT = –INA SEL = 0V, OUT = –INB 10k 10k SHDN A SHDN B FAIRCHILD NC7SZ04 OR EQUIVALENT 5V A 5V INA 5V 10k 10k 5V 60845 F03 INB SEL – + B SHDN Pins Pins 5 and 6 are used for power shutdown of the LTC6084 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 imped- ance, and each amplifier draws less than 1μA current. This feature allows the part to be used in muxed output applications as shown in Figure 3. ESD The LTC6084/LTC6085 has reverse-biased ESD protection diodes on all inputs and outputs as shown in the Simpli- fied Schematic. If these pins are forced beyond either supply, unlimited current will flow through these diodes. If the current is transient and limited to 100mA 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 LTC6084/LTC6085 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 58k resistor, meaning it is desirable to keep the source and feedback resistance at or below this value, i.e., RS + RG||RFB ≤ 58k. Above this total source impedance, the noise voltage is dominated by the resistors. 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 a source resistor below 50GΩ the amplifier noise is dominated by the source resistance. Noise current rises with frequency. See the curve Input Noise Current vs Frequency in the Typical Performance Characteristics section. |
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