OPA196IDBVT Integrated Circuits (ICs)

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1. Describe

The OPA196IDBVT family is a new generation of 36V, rail-to-rail etrim™ operational amplifiers (op amps). These devices offer very low offset voltage (±25 μV, typ), drift (±0.5 μV/°C, typ), and low bias current (±5 pA, typ) and very low quiescent current (140 μA/channel, typical) ) over the entire output range. The unique characteristics of the differential input voltage range of the power rails, high output current (±65 mA), and high capacitive load drive up to 1 nF make the OPA196IDBVT a robust, high-performance operational amplifier for high-voltage industrial applications. The OPAx196 family of op amps are available in standard packages and are specified over the temperature range of –40°C to +125°C. The OPA196IDBVT family of op amps uses e-trim, a package-level trimming method for offset and offset temperature drift in the final manufacturing step after the plastic molding process. This approach minimizes the effects of inherent input transistor mismatch, as well as errors introduced during package molding. Trim communication occurs on the output pins of the standard pins, after setting the trim point, further communication with the trim structure is permanently disabled. Unlike previous e-trim op amps, the OPAx196 uses a patented dual temperature trimming architecture to achieve very low offset voltage and low voltage offset drift over the specified temperature range. This accurate performance over a wide supply voltage range makes these amplifiers useful for high impedance industrial sensors, filters and high voltage data acquisition.

2. Feature

    1. Low offset voltage: ±100 µV (max)

    2. Low offset voltage drift: ±0.5 µV/°C (typ)

    3. Low Bias Current: ±5 pA (typ)

    4. High Common Mode Rejection: 140 dB

    5. Low noise: 15 nV/√Hz at 1 kHz

    6. Rail-to-rail input and output

    7. Differential input voltage range of power rails

    8. Wide bandwidth: 2.5-MHz GBW

    9. Low quiescent current: 140 µA (typ) per amplifier

  10. Wide power supply: ±2.25 V to ±18 V, 4.5 V to 36 V

  11. EMI/RFI filtered input

  12. High capacitive load drive capability: 1 nF

  13. Industry standard packages:

        – SOIC-8, SOT-5 and VSSOP-8 single

        – SOIC-8 and VSSOP-8 dual input

        – Quad channel in SOIC-14, TSSOP-14 and QFN-16

3. Pin configuration

4. Pin Description

5. Application

    1. Multi-channel data acquisition system

    2. Test and measurement equipment

    3. High resolution ADC driver amplifier

    4. SAR ADC reference buffer

    5. Analog input and output modules

    6. High-side and low-side current sensing

    7. High precision comparator

    8. medical equipment

6. Application Information

The OPA196IDBVT family offers excellent DC accuracy and AC performance. These devices operate from power rails up to 36V and offer true rail-to-rail input/output, ultra-low offset voltage and offset voltage drift, as well as 2MHz bandwidth and high capacitive load drive. These features make the OPA196IDBVT a robust, high-performance operational amplifier for high-voltage industrial applications.

7. Function Description

1. input protection circuit

The OPA196IDBVT uses a unique input architecture to eliminate the need for input protection diodes, yet still provides robust input protection under transient conditions. Traditional input diode protection schemes can be activated with fast transient step responses and introduce signal distortion and settling time delays due to the AC path. For low gain circuits, these fast ramping input signals forward bias the back-to-back diodes, resulting in increased input current and thus increased settling time. The OPA196IDBVT family of operational amplifiers provides true high impedance differential input capability for high voltage applications. This patented input protection architecture does not introduce additional signal distortion or delayed settling time, making the device an optimal op amp for multi-channel, high switching input applications. The OPA196 can tolerate a maximum differential swing (voltage between the inverting and non-inverting pins of an op amp) up to 36V, making the device suitable for use as a comparator or for applications with fast ramping input signals, such as multiplexed data acquisition system.

2. Capacitive Loading and Stability

The OPA196IDBVT has a patented output stage capable of driving large capacitive loads and, in unity gain configuration, directly drives purely capacitive loads up to 1 nF. Increasing the gain increases the capability of the amplifier to drive larger capacitive loads. The specific op amp circuit configuration, layout, gain, and output loading are some of the factors to consider when determining if the amplifier is stable Operation. As with many low power amplifiers, some ringing occurs even with capacitive loads less than 100 pF. In unity-gain configurations with no or very light DC loads, place an RC snubber at the OPA196IDBVT output to reduce any chance of ringing in light-load applications. For additional drive capability in unity gain configuration, increase Capacitive loads are driven by inserting a small 10-Ω to 20-Ω resistor (RISO) in series with the output. This resistor significantly reduces ringing while maintaining the DC performance of a purely capacitive load. However, if a resistive load is in parallel with a capacitive load, a voltage divider is created, introducing gain error at the output and reducing the output swing slightly. The introduced error is proportional to the ratio RISO/RL and is usually negligible at low output levels. High capacitive load drive makes the OPA196 ideal for applications such as reference buffers, MOSFET gate drives, and cable shield drives. RISO modifies the open-loop gain of the system to increase phase margin.