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OPA622 Datasheet(PDF) 10 Page - Texas Instruments |
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OPA622 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 19 page  OPA622 10 ® INPUT PROTECTION The need for protection from static damage has long been recognized for MOSFET devices, but all semiconductor devices deserve protection from this potentially damaging source. The OPA622 incorporates on-chip ESD protection diodes as shown in Figure 1. These diodes eliminate the need for external protection diodes, which can add capaci- tance and degrade AC performance. the amplifier input characteristics without necessarily destroying the device. In precision amplifiers, such changes may degrade offset and drift noticeably. For this reason, static protection is strongly recommended when handling the OPA622. DISCUSSION OF PERFORMANCE The OPA622 provides full-power bandwidth previously unattainable in monolithic devices. In addition, the amplifier operates with reduced quiescent. The flexibility of the OPA622 design provides the speed advantages of a current- feedback amplifier or the precision advantages of a voltage- feedback amplifier. The programmable quiescent current feature also helps to adapt the amplifier to the particular design requirements. Figure 2 shows the simplified circuit diagram of the OPA622. It contains four major sections: the bias circuitry, the OTA, the output buffer, and the feedback buffer. BIAS CIRCUITRY The bias circuitry controls the quiescent current of the signal processing stages, allows external quiescent current setting using the resistor RQ connected from Pin 2 to –VCC, sets the amplifier’s transconductance, and, with its temperature characteristics, maintains a constant transconductance over temperature. The quiescent current controls the small-signal bandwidth and AC behavior. The OPA622 is specified with a quiescent current of ±5mA with R Q = 430Ω. The recom- mended range is ±3mA to ±8mA. +V CC –V CC ESD Protection diodes internally connected to all pins. Internal Circuitry External Pin FIGURE 1. Internal ESD Protection. As shown, all input pins of the OPA622 are protected from ESD internally by a pair of back-to-back reverse-biased diodes to either power supply. These diodes begin to con- duct when the input voltage exceeds either power supply by about 0.7V. This situation can occur when the amplifier loses its power supplies while a signal source is still present. The diodes can typically withstand a continuous current of 30mA without destruction. To ensure long-term reliability, however, the diode current should be limited externally to approximately 10mA whenever possible. The internal protection diodes are designed to withstand 2.5kV (using the Human Body Model) and will provide adequate ESD protection for most normal handling proce- dures. However, static damage can cause subtle changes in R OG 13 12 +V CC 2 +In 4 8 12 I Q Adjust –V CC R Q (ext.) 100 Ω 5 + BUF – 3 – In 9 4 V OUT –V CC OUT 6 11 +V CC OUT OTA 10 Bias Circuitry OTA FB OB FIGURE 2. Simplified Circuit Diagram. |
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