MAXIM Manuals (Industrial)

The MAX2654/MAX2655/MAX2656 high IP3 low-noise amplifiers are designed for GPS, PCS, WLL, and satellite phone systems. They incorporate on-chip internal output matching to 50Ω, eliminating the need for external matching components. The MAX2654/MAX2655 feature a shutdown function that reduces operating current to 0.1µA, eliminating the need for an external supply switch. The MAX2654 operates in the GPS frequency of 1575MHz with 15.1dB of gain, 1.5dB noise figure, and only consumes 5.8mA. The MAX2655 is designed with high-input IP3 to improve operation in cellular applications where the cellular power amplifier leaks into the GPS receiver. The MAX2656 is designed for PCS phone applications with 13.5dB of gain in high-gain mode and 0.8dB of gain in low-gain mode (selected by a logic control) and 1.9dB noise figure. The IP3 of MAX2655/MAX2656 is adjustable by a single external bias resistor (RBIAS), allowing supply current to be optimized for a specific application. The MAX2654/MAX2655/MAX2656 operate from +2.7V to +5.5V single supply and are available in the miniature 6-pin SC70 package.

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MAX2371/MAX2373 are wideband low-noise amplifier (LNA) ICs designed for direct conversion receiver (DCR) or very low intermediate frequency (VLIF) receiver applications. They contain single-channel, single-ended LNA with switchable attenuator and automatic gain con- trol (AGC) intended as a low-noise gain stage. These devices provide high gain-control range (typically 60dB) at radio frequency (RF) with excellent noise and reverse isolation characteristics. The MAX2371/MAX2373 can work over the frequency range from 100MHz to 1GHz. In practice, only a narrow band is needed in each application, so different matching circuits can be applied. The devices are dynamically con- figured through the digital/analog control pins to select either maximum gain and low noise figure or power-saving mode. In addition, the MAX2371/MAX2373 feature high/low-current modes, high/low attenuation modes, lin- early controlled gain states, and shutdown mode.

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The MAX12000 is a car and ship GPS front-end amplifier IC, which has two unconditionally stable low-noise amplifier stages, providing high gain and integrated I/O matching, minimizing the need for external matching components and eliminating the need for additional gain stages. The MAX12000 provides the option to place a bandpass ceramic or SAW filter between the two amplifier stages to provide a narrow-band output, further improving the noise performance of the GPS receiver. Additionally, a 3.4dB gain step is provided to compensate for variation in cable loss between different applications. MAX12000 is designed to operate at the GPS frequency of 1575MHz with a typical cascaded gain of 34.8dB and a 25mA supply current. The two LNA stages allow the use of a wide range of GPS filter types for maximum flexibility in system design. The final RF output pin, which drives the cable to the GPS receiver, is also the power-supply connection that accepts a DC supply in the +3.0V to +5.5V range. Alternatively, the DC supply can be applied to pin 4. The GPS front-end amplifier is designed on a low-noise, advanced SiGe process and is available in a lead-free, 10-pin TDFN surface-mount package (3mm x 3mm). Applications are integrated automobile and marine GPS receivers.

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The MAX2634 low-noise amplifier (LNA) is optimized for 315MHz and 433.92MHz automotive remote keyless entry (RKE) applications. At 315MHz, the LNA achieves 15.5dB power gain and a 1.25dB noise figure while only consuming 2.5mA of supply current from a 2.2V to 5.5V power supply. An integrated logic-controlled low-power shutdown mode reduces power consumption to 0.1µA and replaces the two transistors typically required to implement the shutdown function in discrete-based RKE LNA solutions. The device further reduces component count by integrating the output matching and DC-blocking components, and only requires a single inductor to match the input for best noise figure and input return loss. The device is available in a small 6-pin (2.0mm x 2.2mm x 0.9mm) lead-free SC70 package for automotive applications that require visual inspection of PCB solder connections.

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The MAX2657/MAX2658 high-gain, low-noise amplifiers (LNAs) are designed for GPS L1, Galileo, and GLONASS applications. Designed in Maxim’s advanced SiGe process, the devices achieve a high gain and an ultra-low-noise figure while maximizing the input-referred 1dB compression point and the 3rd-order intercept point. The MAX2657/MAX2658 operate from a +1.6V to +3.3V single supply. The MAX2657 is optimized for low current. The MAX2658 is optimized for high linearity. The shut- down feature in the device reduces the supply current to be less than 1µA. The MAX2657/MAX2658 are available in a very small, lead-free, RoHS-compliant, 0.86mm x 1.26mm x 0.65mm, wafer-level package (WLP).

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MAX2686/MAX2688 are low-noise amplifiers (LNAs) designed for GPS L1, Galileo, and GLONASS applications. Designed in Maxim’s advanced SiGe process, the devices achieve high gain and ultra-low-noise figure while maximizing the input-referred 1dB compression point and the 3rd-order intercept point.

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The MAX2667/MAX2669 are high-gain, low-noise amplifiers (LNAs) designed for GPS L1, Galileo, and GLONASS applications. They achieve high gain and low noise figure, while maximizing the input-referred 1dB compression point and the 3rd-order intercept point. The devices operate from a +1.6V to +3.3V single supply. The MAX2667 is optimized for low current, while the MAX2669 is optimized for high linearity. The shutdown feature reduces the supply current to less than 10μA. The devices are available in a small wafer-level package that is lead-free and RoHS-compliant.

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The MAX2666/MAX2668 are a family of low-noise amplifiers intended for use in HSPA mobile handsets. They provide three programmable gain states, delivering superior optimization for linearity and sensitivity versus traditional two-gain-state LNAs. The MAX2666 is optimized for use over the 2100MHz to 2200MHz frequency range (bands 1, 4, and 10) and offers a typical maximum gain of 14.5dB. The MAX2668 is optimized for use over the 850MHz to 1000MHz frequency range (bands 5, 6, and 8) and provides a typical maximum gain of 17dB. Each device is available in a tiny 1mm x 1.5mm, 6-pin ultra-thin LGA package.

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MAX2692/MAX2695 WLAN/WiMAX low-noise amplifiers are low-noise amplifiers designed for WLAN/WiMAX applications. Designed in Maxim's advanced SiGe process, the devices achieve high gain and low noise figure while maximizing 3rd-order intercept point. The devices operate from a +1.6V to +3.6V single supply. The optional shutdown feature in the devices reduces the supply current to less than 10FA. The devices are available in a very small, lead-free, RoHS-compliant, 0.86mm x 0.86mm x 0.65mm wafer-level package (WLP).

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MAX2691 is a low-noise amplifier from Maxim, which is designed for GPS L2 applications. Designed in Maxim’s advanced SiGe process, the device achieves high gain and low noise figure while maximizing the input-referred 1dB compression point and the 3rd-order intercept point. The MAX2691 provides a high gain of 17.5dB and sub 1dB noise figure. The device operates from a +1.6V to +3.6V single sup- ply. The optional shutdown feature in the device reduces the typical supply current to 4FA. The device is available in a very small, lead-free, RoHS-compliant, 0.86mm x 0.86mm x 0.65mm wafer-level package (WLP).

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The MAX9039–MAX9043 and MAX9050–MAX9053 feature combinations of low-power comparators and precision voltage references. Their operating voltage range makes them ideal for both 3V and 5V systems. The MAX9039/MAX9040/MAX9041/MAX9050/MAX9051 have a single comparator and reference consuming only 40µA of supply current. The MAX9042/MAX9043/ MAX9052/MAX9053 have dual comparators and one reference, and consume only 55µA of supply current. Low-voltage operation and low supply current make these devices ideal for battery-operated systems. The comparators feature rail-to-rail inputs and outputs, with a common-mode input voltage range that extends 250mV beyond the supply rails. Input bias current is typically 1.0pA, and input offset voltage is typically 0.5mV. Internal hysteresis ensures clean output switching, even with slow-moving input signals. The output stage features a unique design that limits supply current surges while switching, virtually eliminating supply glitches typical of many other comparators. This design also minimizes overall power consumption under dynamic conditions. The comparator outputs have rail-to-rail, push-pull output stages that sink and source up to 8mA. The propagation delay is 400ns, even with the low-operating supply current. The reference output voltage is set to 1.23V in the MAX9039, to 2.048V in the MAX9040–MAX9043, and to 2.500V in the MAX9050–MAX9053. The MAX9040– MAX9043 and the MAX9050–MAX9053 are offered in two grades.

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The MAX9065 is an ultra-small, low-power, window comparator ideal for a wide variety of portable electronics applications such as cell phones, portable media players, and notebooks that have extremely tight board space and power constraints. It comes in both a 4-bump UCSP package with a 1mm x 1mm footprint (as small as two 0402 resistors) and a 5-pin SOT23 package. The MAX9065 features a common-mode input range of -0.3V to +5.5V independent of supply voltage. The input current goes to zero when the MAX9065 is powered down (VCC = 0). Additionally, the MAX9065 features high RF immunity. The MAX9065 has a push-pull output and consumes only 1µA (max) supply current. The MAX9065 operates down to 1.0V over the extended -40°C to +85°C temperature range. Applications include cell phones, portable media players, electronic toys, notebook computers, and portable medical devices.

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The MAX44268 is the industry’s smallest 1.3mm x 1.3mm, low-power dual comparator. Its ultra-small package and ultra-low power consumption are ideal for battery-powered applications such as cell phones, notebooks, and portable medical devices.

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The MAX971–MAX974 and MAX981–MAX984 single/dual/quad low-voltage comparators feature the lowest power consumption available. These micropower devices draw less than 4µA supply current over temperature (MAX971/MAX972/MAX981/MAX982), and include an internal 1.182V ±1% (MAX971/MAX973/ MAX974) or ±2% (MAX981–MAX984) voltage reference and programmable hysteresis. Ideal for 3V or 5V single-supply applications, these devices operate from a single 2.5V to 11V supply (or ±1.25V to ±5.5V dual supplies), and each comparator’s input voltage ranges from the negative supply rail to within 1.3V of the positive supply. The single MAX971/MAX981 and the dual MAX973/ MAX982/MAX983 provide a unique, simple method for adding hysteresis without feedback or complicated equations, simply by using the HYST pin plus two resistors. The MAX971–MAX974 and MAX981–MAX984’s open- drain outputs permit wire-ORed configurations. Thanks to an 11V output range and separate GND pin for the output transistor (MAX971/MAX974, MAX981/MAX984), these devices are ideal for level translators and bipolar to single- ended converters. For similar devices with complementary output stages, see the MAX921–MAX924 (1% reference) and the MAX931–MAX934 (2% reference).

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The MAX965–MAX970 single/dual/quad micropower comparators feature rail-to-rail inputs and outputs, and fully specified single-supply operation down to +1.6V. These devices draw less than 5µA per comparator and have open-drain outputs that can be pulled beyond VCC to 6V (max) above ground. In addition, their rail-to-rail input common-mode voltage range makes these comparators suitable for ultra-low-voltage operation. A +1.6V to +5.5V single-supply operating voltage range makes the MAX965 family of comparators ideal for 2-cell battery-powered applications. The MAX965/MAX967/ MAX968/MAX969 offer programmable hysteresis and an internal 1.235V ±1.5% reference. All devices are available in either space-saving 8-pin µMAX® or 16-pin QSOP packages.

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The MAX921 series is a family of single-supply, low-voltage comparators with ultra-low power consumption. The series’ static current is less than 4 µA over temperature (MAX921/MAX922), and includes an internal 1.182 V ±1% voltage reference, programmable hysteresis, and TTL/CMOS outputs that sink and source current. Ideal for 3 V or 5 V single-supply applications, the MAX921 series operates from a single +2.5 V to +11 V supply (or a ±1.25 V to ±5 V dual supply), and each comparator’s input voltage range swings from the negative supply rail to within 1.3 V of the positive supply. The MAX921 series’ unique output stage continuously sources as much as 40 mA. By eliminating power-supply glitches that commonly occur when comparators change logic states, the MAX921 series minimizes parasitic feedback, making them easier to use. The single MAX921 and dual MAX923 provide a unique and simple method for adding hysteresis without feedback and complicated equations, simply by using the HYST pin and two resistors.

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