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OPA330AIDCKR Datasheet(PDF) 9 Page - Texas Instruments |
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OPA330AIDCKR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 30 page  CORE - In +In Clamp 10k W 10k W 5k W OPA330 10mAmax +5V V IN V OUT I OVERLOAD Current-limitingresistor requiredifinputvoltage exceedssupplyrailsby ³ 0.3V. OPA330 OPA2330 OPA4330 www.ti.com SBOS432D – AUGUST 2008 – REVISED JUNE 2010 APPLICATIONS INFORMATION The OPA330, OPA2330, and OPA4330 are unity-gain INPUT DIFFERENTIAL VOLTAGE stable, precision operational amplifiers free from The typical input bias current of the OPA330 during unexpected output and phase reversal. The use of normal operation is approximately 200pA. In proprietary Zerø-Drift circuitry gives the benefit of low over-driven conditions, the bias current can increase input offset voltage over time and temperature, as significantly (see Figure 17).The most common cause well as lowering the 1/f noise component. As a result of an over-driven condition occurs when the op amp of the high PSRR, these devices work well in is outside of the linear range of operation. When the applications that run directly from battery power output of the op amp is driven to one of the supply without regulation. The OPA330 family is optimized rails the feedback loop requirements cannot be for low-voltage, single-supply operation. These satisfied and a differential input voltage develops miniature, high-precision, low quiescent current across the input pins. This differential input voltage amplifiers offer high-impedance inputs that have a results in activation of parasitic diodes inside the front common-mode range 100mV beyond the supplies end input chopping switches that combine with 10k Ω and a rail-to-rail output that swings within 100mV of electromagnetic interference (EMI) filter resistors to the supplies under normal test conditions. The create the equivalent circuit shown in Figure 19. OPA330 series are precision amplifiers for Notice that the input bias current remains within cost-sensitive applications. specification within the linear region. OPERATING VOLTAGE The OPA330 series op amps can be used with single or dual supplies from an operating range of VS = +1.8V (±0.9V) up to +5.5V (±2.75V). Supply voltages greater than +7V can permanently damage the device. See the Absolute Maximum Ratings table. Key parameters that vary over the supply voltage or Figure 19. Equivalent Input Circuit temperature range are shown in the Typical Characteristics section of this data sheet. INTERNAL OFFSET CORRECTION INPUT VOLTAGE The OPA330, OPA2330, and OPA4330 op amps use The OPA330, OPA2330, and OPA4330 input an auto-calibration technique with a time-continuous common-mode voltage range extends 0.1V beyond 125kHz op amp in the signal path. This amplifier is the supply rails. The OPA330 is designed to cover zero-corrected every 8ms using a proprietary the full range without the troublesome transition technique. Upon power-up, the amplifier requires region found in some other rail-to-rail amplifiers. approximately 100ms to achieve specified VOS accuracy. This design has no aliasing or flicker noise. Typically, input bias current is about 200pA; however, input voltages exceeding the power supplies can EMI SUSCEPTIBILITY AND INPUT FILTERING cause excessive current to flow into or out of the input pins. Momentary voltages greater than the Operational amplifiers vary in their susceptibility to power supply can be tolerated if the input current is EMI. If conducted EMI enters the operational limited to 10mA. This limitation is easily accomplished amplifier, the dc offset observed at the amplifier with an input resistor, as shown in Figure 18. output may shift from its nominal value while the EMI is present. This shift is a result of signal rectification associated with the internal semiconductor junctions. While all operational amplifier pin functions can be affected by EMI, the input pins are likely to be the most susceptible. The OPA330 operational amplifier family incorporates an internal input low-pass filter that reduces the amplifier response to EMI. Both common-mode and differential mode filtering are provided by the input filter. The filter is designed for a cutoff frequency of approximately 8MHz (–3dB), with a roll-off of 20dB per decade. Figure 18. Input Current Protection Copyright © 2008–2010, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): OPA330 OPA2330 OPA4330 |
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