OPA1664AID

Voltage - Input Offset:	500µV
Base Part Number:	OPA1664
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply, Single/Dual (±):	3 V ~ 36 V, ±1.5 V ~ 18 V
Current - Output / Channel:	50mA
Current - Supply:	1.5mA
Series:	SoundPlus™
Current - Input Bias:	600nA
Gain Bandwidth Product:	22MHz
Slew Rate:	17 V/µs
Output Type:	Rail-to-Rail
Number of Circuits:	4
Amplifier Type:	Audio
Part Status:	Active
Packaging:	Tube

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OPA1664AID Application Field and Working Principle

The OPA1664AID is a Fully Differential Amplifier, part of the OPA1664AID Instrumentation, OP Amps, and Buffer Amps. It integrates all the latest advancements in amplifier design and circuitry, including current feedback op-amps, input/output pairs, and auto-zero compensation technology. This allows OPA1664AID to provide precision audio performance and unparalleled power efficiency. The OPA1664AID is best suited for professional audio applications, such as mixers, preamps, and sound reinforcement systems. The device features low distortion, high dynamic range, high-slew rate, and electrically isolated power planes. It also provides excellent common-mode rejection and low output noise.

Design Overview

The OPA1664AID is a fully differential amplifier featuring a complementary input/output stage and a current feedback-based amplifier. It has a nominal supply voltage of +/-2.5V to +/-18V for maximum efficiency. The device uses a complementary bipolar input stage and uses optimized current sources for rail-to-rail input/output.The OPA1664AID has a current-feedback amplifier architecture with a fixed differential-mode gain of 6 to 10V/V, depending on the input voltage range. The device supports a slew rate of up to 470V/μs, enabling high-bandwidth audio applications. In addition to its power-efficient input/output design, the OPA1664AID also features an auto-zero compensation circuit. This feature reduces the output offset voltage, enabling low-noise operation.

Applications

The OPA1664AID is an ideal choice for audio applications that require low-noise, high-bandwidth performance. It can be used in mixers, preamps, and sound reinforcement systems. The device is also suitable for medical instruments and industrial applications, such as pressure and temperature sensing systems.The OPA1664AID is also often used in digital audio systems. It can be used to build analog-to-digital converters, digital-to-analog converters, and provide low-distortion amplification for digital audio streaming applications.

Working Principle

The OPA1664AID is a fully differential amplifier that uses a complementary input/output stage and a current feedback-based amplifier. It has two power supplies, one positive and one negative, and two input components, an input stage and a current feedback amplifier.The input stage consists of two complementary bipolar transistors, the NPN and the PNP, with the current source connected to the base of each. This stage processes the input signal by amplifying it and making it suitable for the following stage, the current feedback amplifier. The current feedback amplifier is the core of the OPA1664AID. It consists of two transistors, an MOSFET and a bipolar transistor, with each of them connected to the output terminal. This stage is responsible for the voltage amplification of the signal and has a gain of 6 to 10V/V. The amplifier also features auto-zero compensation, preventing the output offset voltage from rising during the transient response. This, in turn, helps reduce the noise levels of the amplifier.Finally, the output stage is a complementary output pair, which consists of two MOSFETs that act as voltage buffers. The buffers provide isolation from the load, prevent current flow, and prevent spurious signals from reaching the load.

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