18-Bit, High-Accuracy Voltage Output DAC with Digital Gain, Offset Control, and SPI Interface

The MAX5318 is a high-accuracy, 18-bit, serial SPI input, buffered voltage output digital-to-analog converter (DAC) in a 4.4mm x 7.8mm, 24-lead TSSOP package. The device features ±2 LSB INL (max) accuracy and a ±1 LSB DNL (max) accuracy over the full temperature range of -40°C to +105°C.

The DAC voltage output is buffered resulting in a fast settling time of 3µs and a low offset and gain drift of ±0.5ppm/°C of FSR (typ). The force-sense output (OUT) maintains accuracy while driving loads with long lead lengths. Additionally, a separate AVSS supply, allows the output amplifier to go to 0V (GND) while maintaining full linearity performance.

The MAX5318 includes user-programmable digital gain and offset correction to enable easy system calibration.

At power-up, the device resets its outputs to zero or midscale. The wide 2.7V to 5.5V supply voltage range and integrated low-drift, low-noise reference buffer amplifier make for ease of use.

The MAX5318 features a 50MHz, 3-wire, SPI interface. The MAX5318 is available in a 24-lead TSSOP package and operates over the -40°C to +105°C temperature range.

Applications

* Automatic Test Equipment * Automatic Tuning and Calibration * Communication Systems * Data-Acquisition Systems * Gain and Offset Adjustment * Medical Imaging * Process Control and Servo Loops * Programmable Voltage and Current Sources * Test and Measurement Equipment

* Ideal for ATE and High-Precision Instruments

* INL Accuracy Guaranteed with ±2 LSB (max) Over Temperature

* Fast Settling Time (3µs) with 10kΩ || 100pF Load

* Safe Power-Up-Reset to Zero or Midscale DAC Output (Pin-Selectable)

* Predetermined Output Device State in Power-Up and Reset in System Design

* Negative Supply (AVSS) Option Allows Full INL and DNL Performance to 0V

* SPI Interface Compatible with 1.8V to 5.5V Logic

* High Integration Reduces Development Time and PCB Area

* Buffered Voltage Output Directly Drives 2kΩ Load Rail-to-Rail

* Integrated Reference Buffer

* No External Amplifiers Required

* Small 4.4mm × 7.8mm, 24-Pin TSSOP Package