MAX5442BEUB

Reference Type:	External
Base Part Number:	MAX5442
Supplier Device Package:	10-uMAX
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Operating Temperature:	-40°C ~ 85°C
Architecture:	R-2R
INL/DNL (LSB):	±0.5, ±0.5
Voltage - Supply, Digital:	5V
Voltage - Supply, Analog:	5V
Series:	--
Data Interface:	SPI
Differential Output:	No
Output Type:	Voltage - Unbuffered
Settling Time:	1µs (Typ)
Number of D/A Converters:	1
Number of Bits:	16
Part Status:	Obsolete
Packaging:	Tube

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Introduction to the MAX5442BEUB The MAX5442BEUB is a low-cost, 8-bit digital-to-analog converter (DAC) with a temperature coefficient of 500ppm/°C. This highly integrated device provides an output range of 0V to Vref(max), and features a wide supply voltage range of ±4.0V to ±12.0V making it suitable for a variety of applications. The device offers accurate and simple digital control in consumer, industrial, and automotive applications needing analog output control. This application notes to helps users understand the working principle of the MAX5444BEUB and how to use it in their applications.Application FieldThe MAX5442BEUB is an excellent choice for consumer and industrial applications that require an accurate and simple digital-to-analog interface. A few of these applications include automotive instrumentation and displays, industrial process control systems, consumer audio knobs and sliders, medical pulse generation, LED dimmer switches, and handheld instrumentation.Working PrincipleThe MAX5442BEUB DAC contains a voltage divider architecture with an 8-bit resolution between 0V and Vref(max). It uses a precision 2.5V, 3.3V or 5V reference (‘Vref’) and can provide an output voltage range of up to VrefMax. The DAC accepts 8-bit input digital data which is decoded and then applied to the voltage divider network. The voltage divider section is controlled by the 8-bit data and further adjusted by the coarse and fine digital controls. Depending on the digital input, the divider will adjust the output voltage from 0V to Vref(max).The device consumes only 5.3mA of quiescent supply current when enabled, and the high-drive output buffers deliver up to 30mA of peak current.ClockingThe MAX5442BEUB features an internal 1.4µs Latch/Update Pulse Generator (or ‘clocker’) with logic inputs for both Latch/Update and Reset. This internal circuit generates the necessary clock pulses to latch the 8-bit data inputs, update the analog output, and reset the DAC to zero. It is possible to override the internal clock by using an external clock source.ReferenceThe MAX5442BEUB contains an integrated, low-noise voltage reference input buffer. The device includes an external 2.5V (or 3.3V and 5V) reference input.Output BufferThe MAX5442BEUB also features an integrated high-drive buffer with capability to deliver up to 30mA of peak output current for applications requiring high output drive current.Power-down ModeThe MAX5442BEUB supports a power-down mode which reduces supply current to typically 3µA. This allows the device to operate using minimal quiescent power while allowing the user to maintain the full range of 8-bit resolution.ConclusionThe MAX5442BEUB digital-to-analog converter is a cost-effective and accurate solution for applications which require a reliable digital-to-analog interface. The device offers an excellent combination of features including an 8-bit resolution with an input range of 0V to Vref(max), an internal latch/update pulse generator, and a high-drive output buffer with capability to deliver up to 30mA of peak output current. The low-noise integrated reference input buffer and the power-down mode further enhance the user experience. The device is suitable for a variety of applications in both consumer and industrial applications.

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