TLV172IDBVT

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1. Describe

TLV172IDBVT Series Electromagnetic Interference (EMI) Immunity, 36V, Single Supply, Low Noise Operational Amplifiers (op amps) with 0.0002% THD+N at 1kHz and capable of operating from 4.5V (±2.25V) to 36V (±18V ). These characteristics, along with low noise and very high PSRR, enable the TLV172IDBVT to amplify microvolt-level signals in HEV and EV vehicles, as well as in powertrains, medical instruments, and more. The TLVx172 devices offer good offset and drift, a high bandwidth of 10 MHz, a slew rate of 10 V/µs, and a quiescent current of only 2.3 mA (max) over temperature. Unlike most op amps that are specified at only one supply voltage, the TLVx172 devices are rated for a voltage range of 4.5 V to 36 V. Input signals beyond the supply rails do not cause phase inversion. The TLVx172 devices are stable with capacitive loads up to 300 pF. The input can operate within 100 mV of the negative rail and 2 V of the positive rail for normal operation. Note that the device can operate with full rail-to-rail input 100 mV beyond the positive rail, but will degrade within 2 V of the positive rail. The TLVx172 op amps are specified over a temperature range of –40°C to +125°C.

2. Feature

    1. Power supply range: 4.5 V to 36 V, ±2.25 V to ±18 V

    2. Low noise: 9 nV/√Hz

    3. Low offset drift: ±1 μV/°C (typ)

    4. Immunity to electromagnetic interference

    5. Input range includes negative supply

    6. Rail-to-rail output

    7. Gain bandwidth: 10 MHz

    8. Slew rate: 10 V/μs

    9. Low quiescent current: 1.6 mA per amplifier

  10. High Common Mode Rejection: 116 dB (typ)

  11. Low input bias current: 10 pA

3. Application

    1. TFT-LCD driver circuit

    2. Touch screen display

    3. wireless network

    4. Portable instruments

    5. Analog-to-Digital Converter (ADC) Buffer

    6. Active filter

    7. Line driver or line receiver

    8. Ultrasound

    9. Currency counter

  10. Sensor amplifier

4. Pin configuration

5. Function Description

    1. Working characteristics

        The TLV172IDBVT amplifier operates from 4.5 V to 36 V (±2.25 V to ±18 V). Many specifications apply from –40°C to +125°C. As shown in the Typical Characteristics section, parameters related to operating voltage or temperature can vary widely.

    2. Reverse phase protection

        The TLV172IDBVT device has internal reverse phase protection. Many op amps exhibit phase inversion when the input is driven beyond the linear common-mode range. This occurs most often in non-inverting circuits when the input is driven beyond the specified common-mode voltage range, causing the output to reverse into the opposite supply rail. The input of the TLV172IDBVT is protected from phase inversion due to excessive common-mode voltage. Instead, output is limited to the appropriate track.

    3. Electrical overstress

        Designers often ask questions about an op amp's ability to withstand electrical overstress. These questions tend to focus on device inputs, but may involve supply voltage pins or even output pins. Each of these different pin functions has electrical stress limits determined by the specific semiconductor fabrication process and the voltage breakdown characteristics of the specific circuit connected to the pin. Additionally, these circuits have built-in internal electrostatic discharge (ESD) protection to prevent accidental ESD events before and during product assembly. It is helpful to have a good understanding of this basic ESD circuit and its correlation to electrical overstress events. The ESD protection circuit consists of several current-controlling diodes connected from the input and output pins to the internal power supply lines, where the diodes meet at the current sinking device inside the op amp. The protection circuit is designed to remain inactive during normal circuit operation.

    4. Capacitive Loading and Stability

        The dynamic characteristics of the TLV172IDBVT are optimized for common operating conditions. The combination of low closed-loop gain and high capacitive loading reduces the phase margin of the amplifier and can cause gain peaking or ringing. Therefore, large capacitive loads must be isolated from the output. The easiest way to achieve this isolation is to place a small resistor in series with the output (for example, ROUT equals 50 Ω).

6. Application Information

The TLV172IDBVT op amp provides high overall performance in a number of general-purpose applications. As with all amplifiers, applications with noisy or high impedance power supplies require decoupling capacitors to be placed close to the device pins. In most cases, a 0.1µF capacitor is sufficient. Follow the other recommendations in the Layout Guidelines section to achieve maximum performance from this device. Many applications introduce capacitive loading (which can cause instability) at the output of the amplifier. To stabilize the amplifier, add an isolation resistor between the amplifier output and the capacitive load. The Typical Applications section shows the process of choosing a resistor.