LCD Display Inverter

Display Inverter / VGA Board / LCD Controller

MaximMAX521414 Digital-to-Analog Conversion Solution

/a>Process Control” title=”Process Control”>Process Control” title=”Process Control”>Process Control and Servo Loops, Handheld Instruments, Power Amplifier Control, Programmable Voltage and Current Sources. This article introduces the main MAX5214/MAX5216 Features, functional block diagram, typical application circuit diagram, and main features of the evaluation kit MAX5214DACLite, circuit diagram and bill of materials, and PCB component layout.

The MAX5214/MAX5216 are pin-compatible, 14-bit and 16-bit digital-to-analog converters (DACs). The MAX5214/MAX5216 are single-channel, low-power, buff-ered voltage-output DACs. The devices use a precision external reference applied through the high resistance input for rail-to-rail operation and low system power consumption. The MAX5214/MAX5216 accept a wide 2.7V to 5.25V supply voltage range. Power consump-tion is extremely low to accommodate most low -power and low-voltage applications. These devices feature a 3-wire SPIK-/QSPIK-/MICROWIREK-/DSP-compatible serial interface to save board space and to reduce the complexity in isolated applications. The MAX5214/ MAX5216 minimize the digital noise feedthrough from input to output with SCLK and DIN input buffers pow-ered down after completion of each serial input frame. On power-up, the MAX5214/MAX5216 reset the DAC output to zero, providing additional safety for applica-tions that drive valves or other transducers that need to be off on p ower-up. The DAC output is buffered resulting in a low supply current of 80FA (max) and a low offset error of Q0.25mV. A 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 are available in an ultra-small (3mm x 3mm), 8-pin FMAX® package and are specified over the -40NC to +105NC extended temperature range.

MAX5214/MAX5216 main features:

Low-Power Consumption (80μA max)

14-/16-Bit Resolution in a 3mm x 3mm, 8-Pin μMAX Package

Relative Accuracy ±0.25 LSB INL (MAX5214, 14-Bit) ±1.0 LSB INL (MAX5216, 16-Bit)

Guaranteed Monotonic Over All Operating Ranges

Low Gain and Offset Error

Wide 2.7V to 5.25V Supply Range

Rail-to-Rail Buffered Output Operation

Safe Power-On Reset (POR) to Zero DAC Output

Fast 50MHz, 3-Wire, SPI/QSPI/MICROWIRE-Compatible Serial Interface

Schmitt-Trigger Inputs for Direct Optocoupler Interface

Asynchronous CLR Clears DAC Output to Code 0

High Reference Input Resistance for Power Reduction

Buffered Voltage Output Directly Drives 10kI Loads

MAX5214/MAX5216 applications:

2-Wire Sensors

Communication Systems

Automatic Tuning

Gain and Offset Adjustment

Power Amplifier Control

Process Control and Servo Loops

Portable Instrumentation

Programmable Voltage and Current Sources

Automatic Test Equipment

Figure 1. MAX5214/MAX5216 functional block diagram

Figure 2. Typical application circuit diagram of the MAX5214/MAX5216

Evaluation Kit MAX5214DACLite

The MAX5214DACLite evaluation kit (EV kit) enables evaluation of the MAX5214 single-channel, low-power, buffered-output, 3-wire SPI interface 14-bit DAC. The EV kit also includes Windows XPM-, Windows VistaM-, and WindowsM 7-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC.

Key features of the EV kit MAX5214DACLite:

USB Powered, No Additional Supply Needed* (Cable Not Included)

3.3V Fixed VDD from On-Board LDO (MAX8510)

3.000V On-Board Precise Voltage Reference (MAX6133)

Direct USB Communication through the MAXQ622 Microcontroller

Windows XP-, Windows Vista-, and Windows 7 (32-bit)-Compatible Software

SPI Interface Terminals

Proven PCB Layout

Fully Assembled and Tested

Figure 3. Evaluation Kit MAX5214DACLite Outline Drawing

Figure 4. Evaluation Kit MAX5214DACLite Circuit Diagram

Bill of Materials for the EV kit MAX5214DACLite:

Figure 5. Evaluation Kit MAX5214DACLite Component Layout (Top Layer)

Figure 6. Evaluation Kit MAX5214DACLite Component Layout (Bottom Layer)
For details, see: