MAXIM Manuals (Industrial)

The MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of load current. A unique current-limited, pulse-frequency-modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of sup- ply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. These ICs also use tiny external components; their high switching frequency (up to 300kHz) allows for less than 5mm diameter surface-mount magnetics. The MAX774/MAX775/MAX776 accept input voltages from 3V to 16.5V, and have preset output voltages of -5V, -12V, and -15V, respectively. Or, the output voltage can be user-adjusted with two resistors. Maximum VIN - VOUT differential voltage is limited only by the break- down voltage of the chosen external switch transistor. These inverters use external P-channel MOSFET switch- es, allowing them to power loads up to 5W. If less power is required, use the MAX764/MAX765/MAX766 inverting switching regulators with on-board MOSFETs.

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The MAX7500/MAX7501/MAX7502 is a temperature sensor product of MAXIM company, which uses high-precision, sigma-delta, analog-to-digital converter (ADC) to accurately measure temperature and provide over-temperature alarm/interrupt/shutdown output through the I2C bus interface.

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The MAX349/MAX350 are 8-channel and dual 4-channel serially controlled multiplexers (muxes). These muxes conduct equally well in either direction. On-resistance (100Ω max) is matched between switches to 16Ω max and is flat (10Ω max) over the specified signal range. These CMOS devices can operate continuously with dual power supplies ranging from ±2.7V to ±8V or a single supply between +2.7V and +16V. Each mux can handle rail-to-rail analog signals. The off-leakage current is only 0.1nA at +25°C or 5nA at +85°C. Upon power-up, all switches are off and the internal shift registers are reset to zero. The serial interface is compatible with SPI™/QSPI™ and MICROWIRE™. Functioning as a shift register, it allows data (at DIN) to be clocked in synchronously with the rising edge of clock (SCLK). The shift register’s output (DOUT) enables several MAX349s or MAX350s to be daisy chained. All digital inputs have 0.8V or 2.4V logic thresholds, ensuring both TTL and CMOS-logic compatibility when using ±5V supplies or a single +5V supply.

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The MAX2264/MAX2265/MAX2266 evaluation kits (EV kits) simplify evaluation of the MAX2264/MAX2265/ MAX2266 power amplifiers (PAs), which are designed for operation in IS-98-based CDMA, IS-136-based TDMA, and PDC cellular phones operating in the 900MHz range. The kits enable testing of the devices’ RF performance and require no additional support circuitry. The EV kits’ signal inputs and outputs use SMA connectors to facilitate the connection of RF test equipment. Each kit is assembled with either the MAX2264, MAX2265 or MAX2266 and incorporates input and output matching components optimized for the 824MHz to 849MHz RF frequency band. These EV kits are capable of operating at RF frequencies from 750MHz to 1000MHz with the appropriate matching components.

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The MAX187 evaluation system consists of a MAX187 evaluation kit and Maxim 68HC16 microcontroller module. The system can function as a data acquisition system, storing samples from the MAX187 in memory and displaying the conversion results on the host computer. It can also evaluate the MAX187's shutdown feature and monitor the supply current in various modes of operation.

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The MAX1226/MAX1228/MAX1230 are serial 12-bit analog-to-digital converters (ADCs) with an internal reference and an internal temperature sensor. These devices feature on-chip FIFO, scan mode, internal clock mode, internal averaging, and AutoShutdown™. The maximum sampling rate is 300ksps using an external clock. The MAX1230 has 16 input channels, the MAX1228 has 12 input channels, and the MAX1226 has 8 input channels. All input channels are configurable for single-ended or differential inputs in unipolar or bipolar mode. All three devices operate from a +5V supply and contain a 10MHz SPI™/QSPI™/MICROWIRE™-compatible serial port. The MAX1230 is available in 28-pin 5mm x 5mm QFN with exposed pad and 24-pin QSOP packages. The MAX1226/MAX1228 are only available in QSOP packages. All three devices are specified over the extended -40°C to +85°C temperature range.

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The MAX1132/MAX1133 are 200ksps, 16-bit ADCs. These serially interfaced ADCs connect directly to SPI™, QSPI™, and MICROWIRE™ devices without external logic. They combine an input scaling network, internal track/hold, clock, a +4.096V reference, and three general-purpose digital output pins (for external multiplexer or PGA control) in a 20-pin SSOP package. The excellent dynamic performance (SINAD ≥ 85dB), high-speed (200ksps), and low power (7.5mA) of these ADCs, make them ideal for applications such as indus- trial process control, instrumentation, and medical applications. The MAX1132 accepts input signals of 0 to +12V (unipolar) or ±12V (bipolar), while the MAX1133 accepts input signals of 0 to +4.096V (unipo- lar) or ±4.096V (bipolar). Operating from a single +4.75V to +5.25V analog supply and a +4.75V to +5.25V digital supply, power-down modes reduce current consumption to 1mA at 10ksps and further reduce supply current to less than 20µA at slower data rates. A serial strobe output (SSTRB) allows direct con- nection to the TMS320 family of digital signal proces- sors. The MAX1132/MAX1133 user can select either the internal clock, or an external serial-interface clock for the ADC to perform analog-to-digital conversions. The MAX1132/MAX1133 feature internal calibration cir- cuitry to correct linearity and offset errors. On-demand calibration allows the user to optimize performance. Three user-programmable logic outputs are provided for the control of a multiplexer or PGA.

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The MAX456 is the first monolithic CMOS 8 x 8 video crosspoint switch that significantly reduces component count, board space, and cost. The crosspoint switch contains a digitally controlled matrix of 64 T-switches that connect eight video input signals to any, or all, output channels. Each matrix output connects to eight internal, high-speed (250V/µs), unity-gain-stable buffers capable of driving 400Ω and 20pF to ±1.3V. For applications requiring increased drive capability, the MAX456 outputs can be connected directly to two MAX470 quad, gain-of-two video buffers, which are capable of driving 75Ω loads. Three-state output capability and internal, programmable active loads make it feasible to parallel multiple MAX456s and form larger switch matrices. In the 40-pin DIP package, crosstalk (70dB at 5MHz) is minimized, and board area and complexity are simplified by using a straight-through pinout. The analog inputs and outputs are on opposite sides, and each channel is separated by a power-supply line or quiet digital logic line.

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The MAX4539/MAX4540 are low-voltage CMOS 8-channel (MAX4539) and dual 4-channel (MAX4540) multiplexers ideal for precision ADC calibration and system self-monitoring applications. These calibration multiplexers (cal-muxes) have precision resistor-dividers to generate accurate voltage ratios from an input reference voltage. The reference ratios include 15/4096 and 4081/4096 of the external reference voltage, accurate to 15 bits, and 1/2V+ and 5/8(V+ - V-), accurate to 8 bits. The external reference voltage as well as ground can also be switched to the output.

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The data sheet describes the features of the MAX6361/MAX6363/MAX6364 power supply monitoring and battery control chips from maxim-ic

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MAX4359/MAX4360/MAX4456 low-cost video cross-point switches are designed to reduce component count, board space, design time, and system cost. Each con- tains a matrix of T-switches that connect any of their four (MAX4359) or eight (MAX4360/MAX4456) video inputs to any of their buffered outputs, in any combination. Each matrix output is buffered by an internal, high-speed (250V/µs), unity-gain amplifier that is capable of driving 400Ω and 20pF at 2.6Vp-p. For applications requiring increased drive capability, buffer the MAX4359/ MAX4360/MAX4456 outputs with the MAX497 quad, gain-of-two video line driver. The MAX4456 has a digitally controlled 8x8 switch matrix and is a low-cost pin-for-pin compatible alternative to the popular MAX456. The MAX4359/MAX4360 are similar to the MAX4456, with the 8x8 switch matrix replaced by a 4x4 (MAX4359) or an 8x4 (MAX4360) switch matrix. Three-state output capability and internal, programmable active loads make it feasible to parallel multiple devices to form larger switch arrays. The inputs and outputs are on opposite sides, and a quiet power supply or digital input line separates each channel, which reduces crosstalk to -70dB at 5MHz. For applications demanding better DC specifications, see the MAX456 8x8 video crosspoint switch.

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MAX4249-MAX4257 are low-noise, low-distortion op-amps that offer Rail-to-Rail® outputs and single-supply operation down to 2.4V. They draw 400µA of quiescent supply current per amplifier while featuring ultra-low distortion (0.0002% THD), as well as low input voltage-noise density (7.9nV/√Hz) and low input current-noise density (0.5fA/√Hz). These features make the devices an ideal choice for portable/battery-powered applications that require low distortion and/or low noise. For additional power conservation, the MAX4249/MAX4251/MAX4253/MAX4256 offer a low-power shut-down mode that reduces supply current to 0.5µA and puts the amplifiers’ outputs into a high-impedance state. The MAX4249-MAX4257’s outputs swing rail-to-rail and their input common-mode voltage range includes ground. The MAX4250–MAX4254 are unity- gain stable with a gain-bandwidth product of 3MHz. The MAX4249/MAX4255/MAX4256/MAX4257 are inter- nally compensated for gains of 10V/V or greater with a gain-bandwidth product of 22MHz. The single MAX4250/MAX4255 are available in space-saving 5-pin SOT23 packages. The MAX4252 is available in an 8-bump chip-scale package (UCSP™) and the MAX4253 is available in a 10-bump UCSP.

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The MAX3748/MAX3748A multirate limiting amplifier functions as a data quantizer for SONET, Fibre Channel, and Gigabit Ethernet optical receivers. The amplifier accepts a wide range of input voltages and provides constant-level current-mode logic (CML) output voltages with controlled edge speeds. A received-signal-strength indicator (RSSI) is available when the MAX3748/MAX3748A is combined with the MAX3744 SFP transimpedance amplifier (TIA).

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MAX3080–MAX3089 is a series of high-speed transceivers for RS-485/RS-422 communication, featuring fail-safe circuitry that guarantees a logic-high receiver output when the receiver inputs are open or shorted.

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The MAX2360 is a dual-band, triple-mode cellular phone transmitter that is the most integrated and architecturally advanced solution to date.

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The MAX1921 evaluation kit provides a fixed 1.8V output voltage from a 2V to 5.5V input source and delivers up to 400mA output current. It is a step-down switching regulator with an internal power switch and synchronous rectifier in a tiny SOT23 package. The MAX1921 EV kit is a fully assembled and tested surface-mount circuit board. It can also be used to evaluate other fixed-output voltage versions of the MAX1921 or the MAX1920, which is a step-down switching regulator with an adjustable output voltage.

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The MAX1707 is a high efficiency, low EMI and low input ripple LED controller that supports a maximum regulated constant current of 610mA for main display backlight, subdisplay backlight (or RGB indicator) and white LED camera flash.

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