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OPA380AIDGKT Datasheet(PDF) 9 Page - Texas Instruments |
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OPA380AIDGKT Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 22 page  OPA380 OPA2380 SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 www.ti.com 9 APPLICATIONS INFORMATION BASIC OPERATION The OPA380 is a high-performance transimpedance amplifier with very low 1/f noise. As a result of its unique architecture, the OPA380 has excellent long-term input voltage offset stability—a 300-hour life test at 150 °C demonstrated randomly distributed variation approximately equal to measurement repeatability of 1 µV. The OPA380 performance results from an internal auto-zero amplifier combined with a high-speed amplifier. The OPA380 has been designed with circuitry to improve overload recovery and settling time over a traditional composite approach. It has been specifically designed and characterized to accommodate circuit options to allow 0V output operation (see Figure 3). The OPA380 is used in inverting configurations, with the noninverting input used as a fixed biasing point. Figure 1 shows the OPA380 in a typical configuration. Power-supply pins should be bypassed with 1 µF ceramic or tantalum capacitors. Electrolytic capacitors are not recommended. OPA380 V OUT (1) (0.5V to 4.4V) V BIAS =0.5V +5V 1 µF R F C F λ NOTE: (1) V OUT = 0.5V in dark conditions. Figure 1. OPA380 Typical Configuration OPERATING VOLTAGE The OPA380 series op amps are fully specified from 2.7V to 5.5V over a temperature range of −40 °C to +125 °C. Parameters that vary significantly with operat- ing voltages or temperature are shown in the Typical Characteristics. INTERNAL OFFSET CORRECTION The OPA380 series op amps use an auto-zero topology with a time-continuous 90MHz op amp in the signal path. This amplifier is zero-corrected every 100 µs using a proprietary technique. Upon power-up, the amplifier requires approximately 400 µs to achieve specified VOS accuracy, which includes one full auto-zero cycle of approximately 100 µs and the start-up time for the bias circuitry. Prior to this time, the amplifier will function properly but with unspecified offset voltage. This design has virtually no aliasing and very low noise. Zero correction occurs at a 10kHz rate, but there is very little fundamental noise energy present at that frequency due to internal filtering. For all practical purposes, any glitches have energy at 20MHz or higher and are easily filtered, if required. Most applications are not sensitive to such high-frequency noise, and no filtering is required. INPUT VOLTAGE The input common-mode voltage range of the OPA380 series extends from V− to (V+) – 1.8V. With input signals above this common-mode range, the amplifier will no longer provide a valid output value, but it will not latch or invert. INPUT OVERVOLTAGE PROTECTION Device inputs are protected by ESD diodes that will conduct if the input voltages exceed the power supplies by more than approximately 500mV. Momentary voltages greater than 500mV beyond the power supply can be tolerated if the current is limited to 10mA. The OPA380 series feature no phase inversion when the inputs extend beyond supplies if the input is current limited. |
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