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OPA365AIDBVTG4 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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OPA365AIDBVTG4 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
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8 / 16 page  OPA365 OPA2365 SBOS365A − JUNE 2006 − REVISED JULY 2006 www.ti.com 8 Figure 2 shows a single-supply, electret microphone application where VCM is provided by a resistive divider. The divider also provides the bias voltage for the elec- tret element. INPUT AND ESD PROTECTION The OPA365 incorporates internal electrostatic dis- charge (ESD) protection circuits on all pins. In the case of input and output pins, this protection primarily con- sists of current steering diodes connected between the input and power-supply pins. These ESD protection diodes also provide in-circuit, input overdrive protec- tion, provided that the current is limited to 10mA as stated in the Absolute Maximum Ratings. Figure 3 shows how a series input resistor may be added to the driven input to limit the input current. The added resistor contributes thermal noise at the amplifier input and its value should be kept to the minimum in noise-sensitive applications. RAIL−TO−RAIL INPUT The OPA365 product family features true rail-to-rail in- put operation, with supply voltages as low as ±1.1V (2.2V). A unique zer ∅-crossover input topology elimi- nates the input offset transition region typical of many rail-to-rail, complementary stage operational amplifiers. This topology also allows the OPA365 to provide superi- or common−mode performance over the entire input range, which extends 100mV beyond both power-sup- ply rails; see Figure 4. When driving ADCs, the highly linear VCM range of the OPA365 assures that the op amp/ADC system linearity performance is not compro- mised. 3.3V 49k Ω V OUT OPA365 Clean 3.3V Supply 1 µF 4k Ω 6k Ω Electret Microphone 5k Ω Figure 2. Microphone Preamplifier 5k Ω OPA365 10mA max V+ V IN V OUT I OVERLOAD Figure 3. Input Current Protection OFFSET VOLTAGE vs COMMON−MODE VOLTAGE 200 150 100 50 0 −50 −150 −100 −200 −2 −3 Common−Mode Voltage (V) 3 −10 1 2 V S = ±2.75V OPA365 Competitors Figure 4. OPA365 has Linear Offset Over the Entire Common-Mode Range |
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