The MAX5174/MAX5176 low-power, serial, voltage-output, 12-bit digital-to-analog converters (DACs) feature a precision output amplifier in a space-saving 16-pin QSOP package. The MAX5174 operates from a single +5V supply, and the MAX5176 operates from a single +3V supply. Both devices draw only 280µA of supply current, which reduces to 1µA in shutdown. In addition, the programmable power-up reset feature allows for a user-selectable output voltage state of either 0 or midscale.
The 3-wire, digital, serial interface is compatible with SPI™/QSPI™, and MICROWIRE™ standards. An input register followed by a DAC register provides a double-buffered input, allowing the input and DAC registers to be updated independently or simultaneously with a 16-bit serial word. Additional features include software and hardware shutdown, shutdown lockout, a hardware clear pin, and a reference input capable of accepting DC and offset AC signals. These devices provide a programmable digital output pin for added functionality and a serial-data output pin for daisy-chaining. All logic inputs are TTL/CMOS compatible and are internally buffered with Schmitt triggers to allow direct interfacing to optocouplers.
The MAX5174/MAX5176 incorporate a proprietary on-chip circuit that keeps the output voltage virtually "glitch free," limiting the glitches to a few millivolts during power-up.
Both devices are available in 16-pin QSOP packages and are specified for the extended (-40°C to +85°C) temperature range. The MAX5170/MAX5172 are pin-compatible 14-bit upgrades to the MAX5174/MAX5176. For 100% pin-compatible DACs with internal reference, see the 13-bit MAX5130/MAX5131 and the 12-bit MAX5120/MAX5121 data sheets.
주요기능
애플리케이션/용도
±1 LSB INL
1µA Shutdown Current
"Glitch Free" Output Voltage at Power-Up
Single-Supply Operation
+5V (MAX5174)
+3V (MAX5176)
Full-Scale Output Range
+2.048V (MAX5176, VREF = +1.25V)
+4.096V (MAX5174, VREF = +2.5V )
Rail-to-Rail Output Amplifier
Adjustable Output Offset
Low THD (-80dB) in Multiplying Operation
SPI/QSPI/MICROWIRE-Compatible 3-Wire Serial Interface
Programmable Shutdown Mode and Power-Up Reset
Buffered Output Capable of Driving 5kΩ || 100pF Loads
User-Programmable Digital Output Pin Allows Serial Control of External Components
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