Maxim’s max5214 / max5216 is a 14 bit / 16 bit single channel low voltage input digital to analog converter (DAC). The operating voltage is 2.7v-5.25v, and the relative accuracy of max5214 is high ± Relative accuracy of 0.25 LSB inl, max5216 ± 1.0 LSB inl, with 50MHz, 3-wire SPI / QSPI / microwire compatible interface, mainly used for 2-wire sensor, communication system, process control and servo loop, portable instrument, power amplifier control. This paper introduces the main features, function block diagram, application word circuit diagram and evaluation board max5214daclite, circuit diagram, product adverbial clause: Bill of materials, PCB component layout.

The max5214 / max5216 are pin compatible 14 bit and 16 bit analog to digital converters (DAC). Max5214 / max5216 is a single channel, low power, gain amplified voltage output DAC. The device uses a precise external reference applied through a high resistance input to achieve rail to rail operation and reduce system power consumption. The max5214 / max5216 can accept a wide supply voltage range of 2.7V to 5.25V. The power consumption is very low, so it can not adapt to most low-power and low-voltage applications. These devices have 3-wire spik – / qspik – / microwire – / DSP compatible serial interfaces to save board space and reduce the complexity of isolated applications. After the completion of each serial input frame, the max5214 / max5216 minimizes the digital noise feedthrough from input to output by reducing the SCLK and din input buffers. When powered on, the max5214 / max5216 resets the DAC output to zero, providing additional security for applications that drive valves or other sensors that need to be closed when powered on. The DAC output is buffered, resulting in low power supply current of 80fa (maximum) and low offset error of q0.25mv. The zero level applied to the CLR pin asynchronously clears the contents of the input and DAC registers, and sets the DAC output to zero, independent of the serial interface. The max5214 / max5216 has an ultra small size (3mm x 3mm),

Main features of max5214 / max5216: 3mm x 3mm, 8 pins μ Max packaged

Low power consumption (up to 80) μ A)

14 / 16 bit resolution

Relative accuracy ± 0.25 LSB inl (max5214, 14 bit) ± 1.0 LSB inl (max5216, 16 bit)

Monotonicity is guaranteed in all working ranges;

Low gain and offset error;

Wide input voltage: 2.7V to 5.25V;

Rail to rail buffer output;

Safe power on reset (POR); Zero DAC output;

Fast 50MHz; 3 wired, SPI / QSPI / microwire compatible serial interface,

Schmidt trigger input for direct optical coupler interface

The asynchronous CLR clears the DAC output to code 0

High reference input resistance to reduce power consumption

Buffer voltage output directly drives 10ki load

Max5214 / max5216 applications:

2-wire sensor

communication system

Auto tuning

Gain and offset adjustment

Power amplifier control

Process control and servo loop

Portable instrument

Programmable voltage and current source

Automatic test equipment

Main characteristics and application range of max5214 / 16 digital to analog converter with single low voltage input

Figure 1. Functional block diagram of max5214 / max5216

Figure 2. Typical application circuit diagram of max5214 / max5216

Evaluation board max5214daclite

Max5214 daclite evaluation board (EV Kit) can evaluate max5214 single channel, low power, buffered output, 3-wire SPI interface, 14 bit DAC. The evaluation board also includes software compatible with windows XPM, windows vistam and windows M7, which can provide a simple graphical user interface (GUI) to perform IC functions.

The main features of max5214daclite are as follows:

USB power supply without additional power * (excluding cable)

3.3V fixed VDD of onboard LDO (max8510)

3.000v onboard precision reference (max6133)

Direct USB communication through maxq622 microcontroller

Windows XP -, Windows Vista – and windows 7 (32-bit) – compatible software

SPI interface terminal,

The verified PCB layout has been verified

Fully assembled and tested

Figure 3. Outline drawing of evaluation board max5214daclite

Figure 4. Circuit diagram of max5214daclite

Material list of evaluation board max5214daclite:

Figure 5. Component layout of evaluation board max5214daclite

Figure 6. Component layout of evaluation board max5214daclite

Editor in charge: GT

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