MAX3664ESA+T

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The MAX3664ESA+T is a linear amplifier from Maxim Integrated’s Special Purpose amplifier family. It features extremely low power consumption and high 3rd order input intercept point (IIP3) for applications in direct conversion receivers for Infrared Data Association (IrDA) standards 1.1, 2.0 and 2.1. Because of its flexibility and robust performance, the MAX3664ESA+T offers a simple and an ideal I/Q demodulator.

The application field of the MAX3664ESA+T primarily encompasses the connection of external receiver rear-ends and filter systems to direct conversion processors. It is employed in communication systems such as IrDA, wireless PAN and Bluetooth that require robustly linear, low-power amplification. Additionally, this amplifier is widely and widely employed in GMSK modulation, GPS, 3G/4G transceivers, PHS and other communication applications.

The MAX3664ESA+T features an input offset voltage (VOS) of 12mV and a gain bandwidth product of 70MHz that allow for strong and fast AC behavior. It supplies a robust gain bandwidth of 21MHz and a unity-gain bandwidth of 5MHz, meeting the demands of communication applications that require strong linearity characteristics. Moreover, its high IIP3 of +25dBm offers noise immunity and excellent IC selectivity.

The MAX3664ESA+T operates at a 1.8V supply voltage, making it suitable for all applications requiring low power consumption without compromising on performance. It is supplied in a 6-pin SC70 package. In addition, it also supports rail-to-rail input/output response and adjustable gain amplifiers.

Now that we know the applications and features of the MAX3664ESA+T, let\'s delve into its working principle. This amplifier adopts a two-stage architecture - one voltage-gain stage and an output buffer. To minimise dissipation, the quiescent current of the amplifier is adjustable. An external bias voltage is applied to the bias pin to ascertain the quiescent current. Thus, the drain current of the first stage MOSFET is regulated.

The amplifier features a high current-mode input buffer with complementary MOSFET input structure. This enables robust common-mode rejection capability at the input pins. The voltage-gain stage features a balanced differential set operating in single-ended output configuration for logic level outputs. The gain of the amplifier is determined by the external gain-setting resistor.

At the output stage, the MAX3664ESA+T features a non-inverting buffer with low-voltage noise and low power consumption. This enables high output voltage swings with an adjustable output level. The limited current output of the output buffer ensures stability with any kind of load.

In summary, the MAX3664ESA+T is an advanced linear amplifier from Maxim Integrated’s Special Purpose amplifier family that features extremely low power consumption and high IIP3 for applications in direct conversion receivers for IrDA. It offers a robust gain bandwidth, unity-gain bandwidth and adjustable output levels. The amplifier employs a two-stage architecture with a current-mode input buffer and a non-inverting output buffer. With this amplifier, designers can easily satisfy the demands of communication applications that require strong linearity characteristics and low power consumption.

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