feature

3 Instructions

Low power consumption: 1.4ma/ch typical

The TL08xx JFET input op amp family is

Wide Common Mode Differential Voltage

Designed to provide a wider selection of op amps than any previously developed family of op amps.

scope

Each JFET input op amp

Low input bias current: typical 30pa

using well-matched high-voltage JFETs and

Low Input Bias Current: 5 Pa typical

Bipolar transistors in monolithic integrated circuits.

Output short circuit protection

The device features high slew rate, low input bias and bias current, and low bias voltage

Low Total Harmonic Distortion: 0.003% typical

Temperature Coefficient.

High input impedance: JFET input stage

white goods

personal electronics

See the orderable addendum at the end of the data sheet for all available packages.

computer

High slew rate: 13 V/μs typical

Common mode input voltage range includes VCC+

applications

tablet

schematic symbols

Detailed description

Overview

The TL08xx JFET input op amp family is designed to provide a wider selection than any previously developed op amp family. Each JFET-input op amp integrates well-matched high-voltage JFETs and bipolar transistors in a monolithic integrated circuit. The device features high slew rate, low input bias and bias current, and low bias voltage temperature coefficient. Offset adjustment and external compensation options are available in the TL08xx family.

C-suffix devices are characterized for operation in the temperature range of 0°C to 70°C. The I-suffix device is characterized for operation over a temperature range of -40°C to +125°C. Q-suffix devices are characterized for operation over a temperature range of -40°C to +125°C. M-suffix devices are characterized for operation over the full military temperature range of -55°C to +125°C.

Functional block diagram

Feature description

total harmonic distortion

Harmonic distortion of audio signals is created by the electronic components in the circuit. Total Harmonic Distortion (THD) is a measure of the accumulated harmonic distortion of a signal in an audio system. The THD of these devices is very low at 0.003%, which means that the TL08x devices will add very little harmonic distortion when used in audio signal applications.

Slew rate

Slew rate is the rate at which an op amp can change its output when the input changes. The slew rate of these devices is 13 volts/microsecond.

Device functional mode

When the power is turned on, these devices are powered on. The device is available as a single-supply op amp or a dual-supply amplifier, depending on the application.

application and implementation

Notice

The information in the application section below is not part of the TI component specification and TI does not warrant its accuracy or completeness. TI's customers are responsible for determining the suitability of parts for their purpose. Customers should verify and test their design implementation to confirm system functionality.

Application Information

The TL08x family of operational amplifiers can be used in countless applications. Several applications in this section show the principles used in all applications of these sections.

typical application

Inverting Amplifier Applications

Typical application of an operational amplifier in an inverting amplifier. This amplifier applies a positive voltage to the input, making it a negative voltage of the same magnitude. Likewise, it also makes negative voltages positive.

Inverting Amplifier Application Schematic

Design requirements

The supply voltage must be chosen so that it is larger than the input voltage range and output range. For example, this application will scale a ±0.5 V signal to ±1.8 V. Setting the power supply to ±12 V is sufficient for this application.

layout

Layout Guidelines

For the best operating performance of your device, use good PCB layout practices, including:

Noise can propagate into the analog circuit through the power supply pins of the circuit as well as through the op amp. Bypass capacitors reduce coupled noise by providing a low impedance source local to the analog circuit.

– Connect low ESR, 0.1µF ceramic bypass capacitors between each supply pin and ground as close to the device as possible. A single bypass capacitor from V+ to ground is suitable for single supply applications.

Separate grounding for the analog and digital parts of a circuit is one of the simplest and most effective methods of noise suppression. One or more layers on multilayer PCBs are typically used for ground planes. The ground plane helps dissipate heat and reduce EMI noise. Make sure that the digital and analog grounds are physically separated and pay attention to the flow of ground currents. See Board Layout Techniques (SLOA089) for more details.

To reduce parasitic coupling, keep the input channel as far away from the power supply or output channel as possible. If it is not possible to separate them, it is better to cross the sensitive track perpendicularly rather than parallel to the noise track.

Place external components as close to the device as possible. Keeping RF and RG close to the inverting input minimizes parasitic capacitance, as shown in . layout example

Keep the length of the input trace as short as possible. Remember that the input trace is the most sensitive part of the circuit.

Consider installing a driven low-impedance guard ring around critical traces. Guard rings can significantly reduce leakage currents from nearby traces at different potentials.

layout example