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Home » NEWEST Products » New by Manufacturer » Maxim Integrated » MAXREFDES24 Alameda Reference Design - Maxim
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Maxim MAXREFDES24 Alameda Reference Design

Maxim MAXREFDES24 Alameda Reference Design

Overview

Maxim's MAXREFDES24 Alameda Reference Design features four dense, highly accurate analog outputs in a compact, galvanically isolated form factor. Each channel provides current or voltage. This design uniquely fits in programmable logic controllers (PLC), distributed control systems (DCS), and other industrial applications. The Alameda subsystem combines four high-accuracy (< ±0.1%) outputs with a high-efficiency, low-noise power supply controller on a single board. Alameda offers extreme flexibility—its outputs are configurable to ±10V, ±20mA, 0 to 10V, or 4-20mA for current and voltage applications. Automatic error reporting for detecting open and short circuits, brown-outs, and overtemperature conditions make this subsystem ideal for demanding, precision industrial control and automation applications.

Maxim MAXREFDES24 Alameda Reference Design

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Features
  • Programmable High-Accuracy Current/Voltage Output
  • Current Output Drives Up to 1kΩ
  • Voltage Output Drives Loads Down to 1kΩ
  • Extensive Error Reporting

  • Isolated Power and Data
  • Device Drivers
  • Example C Source Code
  • Pmod™-Compatable Form Factor
Block Diagram
Block Diagram

MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators

Maxim MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators maximize battery life by combining ultra-low supply currents and low dropout voltages. They feature Dual Mode™ operation, which presets the output to 5V, or permits it to be adjusted between 1.25V and 16V. The regulator supplies up to 350mA, with a typical dropout of 650mV for the MAX1658 and 490mV for the MAX1659. With their P-channel MOSFET pass transistor, these devices maintain a low quiescent current from zero output current to the full 350mA, even in dropout. They support input voltages ranging from 2.7V to 16.5V. MAX1659 features a 1µA shutdown mode, reverse battery protection, short-circuit protection, and thermal shutdown. They are available in a special high-power (1.2W), 8-pin SO package designed specifically for compact applications.

Maxim MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators

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Additional Resources
Datasheet Datasheet

Features
  • Wide Input Voltage Range: 2.7V to 16.5V
  • Low, 490mV Dropout at 350mA Output Current
  • 30µA Supply Current
  • 1µA Max Shutdown Current
  • High-Power (1.2W) 8-Pin SO Package
  • Dual Mode Operation Output:
    • Fixed 5.0V or Adjustable (1.25V to 16V)
  • Thermal Overload Protection
  • Current-Limit Protection
  • Reverse Battery Protection
Applications
  • Cell Phones
  • Digital Cordless Phones
  • Electronic Planners
  • Handheld Instruments (PDAs, Palmtops)
  • Modems
  • Palmtop Computers
  • PCMCIA Cards
  • PCS Phones
Block Diagram
Block Diagram

MAX5134 16-Bit Quad Digital-to-Analog Converter (DAC)

Maxim's MAX5134 16-Bit Quad Digital-to-Analog Converter (DAC) is a low-power, quad 16-bit, buffered voltage-output, high-linearity DAC. It accepts a wide +2.7V to +5.25V supply-voltage range to accommodate most low-power and low-voltage applications. They accept a 3-wire SPI-/QSPI™-/MICROWIRE®-/DSP-compatible serial interface to save board space and reduce the complexity of optically isolated and transformer-isolated applications. The digital interface's double-buffered hardware and software active-low LDAC provide simultaneous output updates. The serial interface features an active-low READY output for easy daisy-chaining of several devices and/or other compatible devices. The MAX5134 include a hardware input to reset the DAC outputs to zero or midscale upon power-up or reset, providing additional safety for applications that drive valves or other transducers that need to be off during power-up. The high linearity of the DACs makes these devices ideal for precision control and instrumentation applications.

Maxim MAX5134 16-Bit Quad Digital-to-Analog Converter (DAC)
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Additional Resources
DatasheetDatasheet
Features
  • 16-Bit Resolution Available in a 4mm x 4mm, 24-Pin TQFN Package or 16-Pin TSSOP
  • Hardware-Selectable to Zero/Midscale DAC Output on Power-Up or Reset
  • Double-Buffered Input Registers
  • Active-Low LDAC Asynchronously Updates DAC Outputs Simultaneously
  • Active-Low READY Facilitates Daisy Chaining
  • High-Performance 10ppm/°C Internal Reference
  • Guaranteed Monotonic Over All Operating Conditions
  • Wide +2.7V to +5.25V Supply Range
  • Rail-to-Rail Buffered Output Operation
  • Low Gain Error (Less Than ±0.5%FS) and Offset (Less Than ±10mV)
  • 30MHz 3-Wire SPI-/QSPI-/MICROWIRE-/DSP-Compatible Serial Interface
  • CMOS-Compatible Inputs with Hysteresis
  • Low-Power Consumption (ISHDN = 2µA max)
Applications
  • Automatic Test Equipment
  • Automatic Tuning
  • Communication Systems
  • Data Acquisition
  • Gain and Offset Adjustment
  • Portable Instrumentation
  • Power-Amplifier Control
  • Process Control and Servo Loops
  • Programmable Voltage and Current Sources
Operating Circuit
Operating Circuit

MAX6126 Ultra-Low-Noise, Series Voltage Reference

Maxim MAX6126 Ultra-High-Precision, Ultra-Low-Noise, Series Voltage Reference is an ultra-low-noise, high-precision, low-dropout voltage reference. This family of voltage references feature curvature-correction circuitry and high-stability, laser-trimmed, thin-film resistors that result in 3ppm/°C (max) temperature coefficients and an excellent ±0.02% (max) initial accuracy. The proprietary low-noise reference architecture produces a low flicker noise of 1.3µVP-P and wideband noise as low as 60nV/√Hz (2.048V output) without the increased supply current usually found in low-noise references. Improve wideband noise to 35nV/√Hz and AC power-supply rejection by adding a 0.1µF capacitor at the noise reduction pin. Maxim MAX6126 series mode reference operates from a wide 2.7V to 12.6V supply voltage range and load-regulation specifications are guaranteed to be less than 0.025Ω for sink and source currents up to 10mA. These devices are available over the automotive temperature range of -40°C to +125°C.

Maxim MAX6126 Ultra-High-Precision, Ultra-Low-Noise, Series Voltage Reference

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Additional Resources
Datasheet Datasheet
Features
  • Ultra-Low 1.3µVP-P Noise (0.1Hz to 10Hz, 2.048V Output)
  • Ultra-Low 3ppm/°C (max) Temperature Coefficient
  • ±0.02% (max) Initial Accuracy
  • Wide (VOUT + 200mV) to 12.6V Supply Voltage Range
  • Low 200mV (max) Dropout Voltage
  • 380µA Quiescent Supply Current
  • 10mA Sink/Source-Current Capability
  • Stable with CLOAD = 0.1µF to 10µF
  • Low 20ppm/1000hr Long-Term Stability
  • 0.025Ω (max) Load Regulation
  • 20µV/V (max) Line Regulation
  • Force and Sense Outputs for Remote Sensing
Applications
  • Automated Test Equipment (ATE)
  • Digital Voltmeters
  • High-Accuracy Industrial and Process Control
  • High-Accuracy Reference Standard
  • High-Resolution A/D and D/A Converters
  • Precision Current Sources
Block Diagram
Block Diagram

MAX14850 Six-Channel Digital Isolator

Maxim's MAX14850 Six-Channel Digital Isolator utilizes Maxim's proprietary process technology, whose monolithic design provides a compact and low-cost transfer of digital signals between circuits with different power domains. The technology enables low power consumption and stable high-temperature performance. The four unidirectional channels are each capable of DC to 50Mbps, with two of the four channels passing data across the isolation barrier in each direction. The two bidirectional channels are open drain and each is capable of data rates from DC to 2Mbps. Independent 3.0V to 5.5V supplies on each side of the isolator also make it suitable for use as a level translator. The MAX14850 can be used for isolating SPI busses, I2C busses with clock stretching, RS-232, RS-485/RS-422 busses, and general-purpose isolation. When used as a bus isolator, extra channels are available for power monitoring and reset signals.

Maxim MAX14850 Six-Channel Digital Isolator
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Additional Resources
Datasheet Datasheet
Features
  • Protection from High-Voltage Environments
  • 600VRMS Isolation for 60 Seconds
  • Short-Circuit Protection on Unidirectional Outputs
  • Complete Digital Isolation Solution
  • Four Unidirectional Signal Paths: 2-In/2-Out
  • Two Bidirectional Open-Drain Signal Paths
  • 50Mbps (max) Unidirectional Data Rate
  • 2Mbps (max) Bidirectional Data Rate
  • Compatible with Many Interface Standards
  • I2C With Clock Stretching
  • SPI
  • RS-232, RS-422/RS-485
  • SMBus, PMBus Interfaces
Applications
  • Battery Management
  • I2C, SPI, SMBus, PMBus™ Interfaces
  • Industrial Control Systems
  • Isolated RS-232, RS-485/RS-422
  • Medical Systems
  • Telecommunication Systems
Operating Circuit Operating Circuit

MAX15500 Analog Current/Voltage Output Conditioners

Maxim MAX15500 Analog Current/Voltage Output Conditioners provide a programmable current up to ±24mA, or a voltage up to ±12V proportional to a control voltage signal. The control voltage is typically supplied by an external DAC with an output voltage range of 0 to 4.096V for the MAX15500. The output current and voltage are selectable as either unipolar or bipolar. In the unipolar configuration, a control voltage of 5% full-scale (FS) produces a nominal output of 0A or 0V to achieve underrange capability. A control voltage of 100%FS produces one of two programmable levels (105%FS or 120%FS) to achieve overrange capability. The outputs of the MAX15500 are protected against overcurrent conditions and a short to ground or supply voltages up to ±35V. The devices also monitor for overtemperature and supply brownout conditions. The supply brownout threshold is programmable.

Maxim MAX15500 Analog Current/Voltage Output Conditioners
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Additional Resources
Datasheet Datasheet
Features
  • Supply Voltage Up to ±32.5V
  • Output Protected Up to ±35V
  • Programmable Output (Plus Overrange)
    • ±10V
    • 0 to 10V
    • 0 to 5V
    • ±20mA
    • 0 to 20mA
    • 4 to 20mA
  • Current Output Drives 0 to 1kΩ
  • Voltage Output Drives Loads Down to 1kΩ
  • HART Compliant
  • 2ppm Gain Error Drift Over Temperature
  • SPI Interface, with Daisy-Chain Capability
  • Supports +4.096V (MAX15500)

  • Extensive Error Reporting
    • Short-Circuit and Overcurrent Protection
    • Open-Circuit Detection
    • Brownout Detection
    • Overtemperature Protection
  • Fast, 40µs Settling Time

Applications
  • Distributed I/Os
  • Embedded Systems
  • Industrial Control and Automation
  • Programmable Logic Controllers (PLCs)
Block Diagram
Block Diagram

MAX17498B AC-DC & DC-DC Peak-Current-Mode Converters

Maxim's MAX17498B AC-DC & DC-DC Peak-Current-Mode Converters are current-mode fixed-frequency flyback/boost converters with a minimum number of external components. They contain all the control circuitry required to design wide input voltage isolated and nonisolated power supplies. It supports UVLO thresholds suitable to low-voltage DC-DC applications. The switching frequency is 500kHz. This frequency allows the use of tiny magnetic and filter components, resulting in compact, cost-effective power supplies. An EN/UVLO input allows the user to start the power supply precisely at the desired input voltage, while also functioning as an on/off pin. The OVI pin enables implementation of an input overvoltage-protection scheme that ensures that the converter shuts down when the DC input voltage exceeds the desired maximum value. The devices incorporate a flexible error amplifier and an accurate reference voltage (REF) to enable the end user to regulate both positive and negative outputs. Programmable current limit allows proper sizing and protection of the primary switching FET. The device supports a maximum duty cycle greater than 92% and provides programmable slope compensation to allow optimization of control loop performance. Hiccup-mode overcurrent protection and thermal shutdown are provided to minimize dissipation under overcurrent and overtemperature fault conditions.

Maxim MAX17498B AC-DC & DC-DC Peak-Current-Mode Converters
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Additional Resources
DatasheetDatasheet
Features
  • Peak Current-Mode Converter
  • Current-Mode Control Provides Excellent Transient Response
  • Fixed Switching Frequency: 500kHz
  • Flexible Error Amplifier to Regulate Both Positive and Negative Outputs
  • Programmable Soft-Start to Reduce Input Inrush Current
  • Programmable Voltage or Current Soft-Start
  • Power-Good Signal (PGOOD)
  • Reduced Power Dissipation Under Fault
    • Overcurrent Protection
    • Thermal Shutdown with Hysteresis
  • Robust Protection Features
    • Programmable Current Limit
    • Input Overvoltage Protection
  • Optimized Loop Performance
    • Programmable Slope Compensation

  • High Efficiency
    • Low RDSON, 175mΩ, 65V Rated Internal n-Channel MOSFET
    • No Current-Sense Resistor
    • Optional Spread Spectrum
  • Space-Saving, 16-Pin (3mm x 3mm) TQFN Package

  • Applications
    • Front-End AC/DC Power Supplies for Industrial Applications (Isolated and Nonisolated)
    • Telecom Power Supplies
    • Wide Input Range DC Input Flyback/Boost Industrial Power Supplies
Block DiagramBlock Diagram
eNews
View More About Maxim MAX1659 Low-Dropout Linear RegulatorView More About Maxim MAX5134 16-Bit Quad Digital-to-Analog Converter (DAC)View More About Maxim MAX6126 Ultra-Low-Noise, Series Voltage ReferenceView More About Maxim MAX14850 Six-Channel Digital IsolatorView More About Maxim MAX15500 Analog Current/Voltage Output ConditionersView More About Maxim MAX15500 Analog Current/Voltage Output ConditionersView More About Maxim MAX15500 Analog Current/Voltage Output ConditionersView More About Maxim MAX15500 Analog Current/Voltage Output ConditionersView More About Maxim MAX17498B AC-DC & DC-DC Peak-Current-Mode Converters
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