Overview
The DAC81404RHBR, produced by Texas Instruments, is a quad-channel, 16-bit, high-voltage-output digital-to-analog converter (DAC) with a precision internal reference. This device is part of the DACx1404 family, which includes the 12-bit DAC61404, and is known for its high linearity and reliability features. The DAC81404 is specified monotonic and provides a low-drift, 2.5-V internal reference, eliminating the need for an external precision reference in most applications. It features per channel sense pins to mitigate IR drops and sense up to ±12 V of ground bounce. The device is packaged in a 32-pin VQFN (RHB) package and operates over a temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16-bit |
| Number of Channels | Quad-channel |
| Output Voltage Range | ±20 V, ±10 V, ±5 V (bipolar); 40 V, 20 V, 10 V, 5 V (unipolar) |
| Output Buffer Drive Capability | ±15 mA |
| Integral Nonlinearity (INL) | ±1 LSB maximum |
| Total Unadjusted Error (TUE) | ±0.05% FSR, maximum |
| Internal Reference Voltage | 2.5 V |
| Reference Accuracy | ±2.5 mV, maximum |
| Reference Drift | 10 ppm/°C, maximum |
| Operating Temperature Range | –40°C to +125°C |
| Package Type | 32-pin VQFN (RHB) |
| Serial Interface | 4-wire SPI-compatible, 1.7 V to 5.5 V operation |
Key Features
- High Linearity and Accuracy: Specified monotonic with ±1 LSB INL and ±0.05% FSR TUE.
- Integrated Output Buffers: Capable of sinking or sourcing up to ±15 mA, reducing the need for additional operational amplifiers.
- Low-Drift Internal Reference: 2.5-V precision reference with ±2.5 mV initial accuracy and 10 ppm/°C drift.
- Per Channel Sense Pins: Eliminate IR drops and sense up to ±12 V of ground bounce.
- User-Selectable Output Configuration: Full-scale bipolar and unipolar output voltages independently programmable for each channel.
- Reliability Features: CRC error check, short-circuit protection, and thermal alarm.
- Power-On Reset: DAC outputs connected to ground at power-up until properly configured.
- Serial Interface: 4-wire SPI-compatible interface operating from 1.7 V to 5.5 V.
Applications
The DAC81404RHBR is suitable for various applications requiring high precision and reliability, such as:
- Industrial Automation: Control systems, process control, and instrumentation.
- Medical Devices: Diagnostic equipment, patient monitoring systems, and medical imaging.
- Aerospace and Defense: High-reliability systems requiring precise analog output.
- Test and Measurement: Calibration equipment, data acquisition systems, and automated test equipment.
- Automotive Systems: Advanced driver-assistance systems (ADAS), infotainment, and control systems.
Q & A
- What is the resolution of the DAC81404RHBR?
The DAC81404RHBR has a resolution of 16 bits.
- How many channels does the DAC81404RHBR have?
The DAC81404RHBR is a quad-channel DAC.
- What are the available output voltage ranges for the DAC81404RHBR?
The device supports full-scale bipolar output voltages of ±20 V, ±10 V, and ±5 V, and full-scale unipolar output voltages of 40 V, 20 V, 10 V, and 5 V.
- What is the drive capability of the integrated output buffers?
The integrated output buffers can sink or source up to ±15 mA.
- What is the operating temperature range of the DAC81404RHBR?
The operating temperature range is –40°C to +125°C.
- What type of serial interface does the DAC81404RHBR use?
The device uses a 4-wire SPI-compatible serial interface operating from 1.7 V to 5.5 V.
- Does the DAC81404RHBR have built-in reliability features?
Yes, it includes features such as CRC error check, short-circuit protection, and a thermal alarm.
- What is the purpose of the per channel sense pins?
The per channel sense pins eliminate IR drops and sense up to ±12 V of ground bounce.
- Is the DAC81404RHBR specified monotonic?
Yes, the DAC81404RHBR is specified monotonic.
- What is the initial accuracy of the internal reference?
The initial accuracy of the internal reference is ±2.5 mV.
