SBOS755 October   2016 TLV2376 , TLV376 , TLV4376

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information: TLV376
    5. 6.5 Thermal Information: TLV2376
    6. 6.6 Thermal Information: TLV4376
    7. 6.7 Electrical Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Operating Voltage
      2. 7.3.2 Capacitive Load and Stability
      3. 7.3.3 Input Offset Voltage and Input Offset Voltage Drift
      4. 7.3.4 Common-Mode Voltage Range
      5. 7.3.5 Input and ESD Protection
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Operating Characteristics
      2. 8.1.2 Basic Amplifier Configurations
      3. 8.1.3 Active Filtering
      4. 8.1.4 Driving an Analog-to-Digital Converter
      5. 8.1.5 Phantom-Powered Microphone
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 TINA-TI (Free Software Download)
        2. 11.1.1.2 TI Precision Designs
        3. 11.1.1.3 WEBENCH® Filter Designer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Related Links
    4. 11.4 Receiving Notification of Documentation Updates
    5. 11.5 Community Resources
    6. 11.6 Trademarks
    7. 11.7 Electrostatic Discharge Caution
    8. 11.8 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

The TLV376 family of operational amplifiers is built using e-trim™, a proprietary technique in which offset voltage is adjusted during the final steps of manufacturing. This technique compensates for performance shifts that can occur during the molding process. Through e-trim™, the TLV376 family delivers excellent offset voltage (40 μV, typical). Additionally, the amplifier boasts a fast slew rate, low drift, low noise, and excellent PSRR and AOL. These 5.5-MHz CMOS op amps only consume 815-µA (typical) quiescent current.

8.1.1 Operating Characteristics

The TLVx376 family of amplifiers has parameters that are fully specified from 2.2 V to 5.5 V (±1.1 V to ±2.75 V). Many of the specifications apply from –40°C to +125°C. Parameters that can exhibit significant variance with regard to operating voltage or temperature are presented in the Typical Characteristics section.

8.1.2 Basic Amplifier Configurations

The TLVx376 family is unity-gain stable. The TLVx376 does not exhibit output phase inversion when the input is overdriven. A typical single-supply connection is shown in Figure 25. The TLV376 is configured as a basic inverting amplifier with a gain of –10 V/V. This single-supply connection has an output centered on the common-mode voltage, VCM. For the circuit shown, this voltage is 2.5 V, but can be any value within the common-mode input voltage range.

TLV376 TLV2376 TLV4376 ai_ss_connex_bos755.gif Figure 25. Basic Single-Supply Connection

8.1.3 Active Filtering

The TLVx376 family is well-suited for filter applications requiring a wide-bandwidth, fast slew rate, low-noise, single-supply operational amplifier. Figure 26 shows a 50-kHz, 2nd-order, low-pass filter. The components have been selected to provide a maximally-flat Butterworth response. Beyond the cutoff frequency, roll-off is –40 dB per decade. The Butterworth response is ideal for applications requiring predictable gain characteristics (such as the antialiasing filter used ahead of an ADC).

TLV376 TLV2376 TLV4376 ai_2nd-ord_butter_bos755.gif Figure 26. Second-Order, Butterworth, 50-kHz, Low-Pass Filter

8.1.4 Driving an Analog-to-Digital Converter

The low-noise and wide-gain bandwidth of the TLVx376 family make these devices ideal for driving ADCs. Figure 27 shows the TLV376 driving an ADS8327, a 16-bit, 250-kSPS converter. The amplifier is connected as a unity-gain, noninverting buffer.

TLV376 TLV2376 TLV4376 ai_driving_bos755.gif

NOTE:

Suggested value; may require adjustment based on specific application.
Figure 27. Driving an ADS8327

8.1.5 Phantom-Powered Microphone

The circuit shown in Figure 28 depicts how a remote microphone amplifier can be powered by a phantom source on the output side of the signal cable. The cable serves double duty, carrying both the differential output signal from and dc power to the microphone amplifier stage.

A TLV2376 serves as a single-ended input to a differential output amplifier with a 6-dB gain. Common-mode bias for the two op amps is provided by the dc voltage developed across the electret microphone element. A 48-V phantom supply is reduced to 5.1 V by the series 6.8-kΩ resistors on the output side of the cable, and the 4.7 kΩ and zener diode on the input side of the cable. AC coupling blocks the different dc voltage levels from each other on each end of the cable.

An INA163 instrumentation amplifier provides differential inputs and receives the balanced audio signals from the cable. The INA163 gain can be set from 0 dB to 80 dB by selecting the RG value. The INA163 circuit is typical of the input circuitry used in mixing consoles.

TLV376 TLV2376 TLV4376 ai_phantom_microphone_bos755.gif Figure 28. Phantom-Powered Electret Microphone

8.2 Typical Application

TLV376 TLV2376 TLV4376 typ_app_lpf_bos755.gif Figure 29. Second-Order, Low-Pass Filter

8.2.1 Design Requirements

Low-pass filters are commonly employed in signal-processing applications to reduce noise and prevent aliasing. The TLV376 is ideally suited to construct high-speed, high-precision active filters. Figure 29 shows a second-order, low-pass filter commonly encountered in signal-processing applications.

Use the following parameters for this design example:

  • Gain = 5 V/V (inverting gain)
  • Low-pass cutoff frequency = 25 kHz
  • Second-order Chebyshev filter response with 3-dB gain peaking in the passband

8.2.2 Detailed Design Procedure

The infinite-gain multiple-feedback circuit for a low-pass network function is shown in the Application Curve section. Use Equation 1 to calculate the voltage transfer function.

Equation 1. TLV376 TLV2376 TLV4376 App_EQ_1_SBOS165.gif

This circuit in Figure 29 produces a signal inversion. For this circuit, the gain at dc and the low-pass cutoff frequency are calculated by Equation 2:

Equation 2. TLV376 TLV2376 TLV4376 App_EQ_2_SBOS165.gif

Software tools are readily available to simplify filter design. The WEBENCH® filter designer is a simple, powerful, and easy-to-use active filter design program. The WEBENCH® filter designer allows optimized filter designs to be created by using a selection of TI operational amplifiers and passive components from TI's vendor partners.

Available as a web-based tool from the WEBENCH® design center, the WEBENCH® filter designer allows complete multistage active filter solutions to be designed, optimized, and simulated within minutes.

8.2.3 Application Curve

TLV376 TLV2376 TLV4376 D011_SBOS406.gif Figure 30. Measured Frequency Response of the Second-Order, Low-Pass Filter