Overview
The DAC8728SPAG from Texas Instruments is a low-power, octal, 16-bit digital-to-analog converter (DAC). This device is designed to provide high accuracy and flexibility in various applications. With a 5V reference, the output can be either bipolar (±15V or up to ±16.5V) or unipolar (0V to +30V or up to +33V), depending on the power supply configuration. The DAC8728SPAG operates over a wide temperature range of –40°C to +105°C and is trimmed in manufacturing to ensure very low zero and full-scale errors. User calibration can further enhance the accuracy to ±1 LSB for both bipolar and unipolar supplies.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 16 | - | - | Bits |
| Linearity Error | - | - | ±4 | LSB |
| Differential Linearity Error | - | - | ±1 | LSB |
| Bipolar Zero Error | - | - | ±10 | LSB |
| Output Voltage Range (Bipolar) | -15 | - | +15 | V |
| Output Voltage Range (Unipolar) | 0 | - | +33 | V |
| Output Impedance | - | 0.5 | - | Ω |
| Power Supply (AVDD) | +4.5 | - | +18 | V |
| Power Supply (AVSS) | -18 | - | -4.5 | V |
| Power Consumption (Normal Operation) | - | 4 | 6 | mA |
| Power Consumption (Power Down) | - | 35 | - | μA |
Key Features
- Low-power operation: 13.5mW per channel.
- High-speed 16-bit parallel interface: up to 50MHz, 1.8V, 3V, and 5V logic compatible.
- Double-buffered interface logic with asynchronous load (LDAC) and clear (CLR) inputs.
- Pin-to-pin compatibility with DAC8228 (14-bit) and DAC7728 (12-bit).
- User calibration for zero and gain adjustments to achieve ±1 LSB accuracy.
- Monitor output (VMON) connected to individual analog outputs, offset DAC, and reference buffer outputs through a multiplexer.
- Operating temperature range: –40°C to +105°C.
Applications
- Automatic Test Equipment.
- PLC and Industrial Process Control.
- Communications.
Q & A
- What is the resolution of the DAC8728SPAG?
The DAC8728SPAG has a 16-bit resolution.
- What are the possible output voltage ranges for the DAC8728SPAG?
The output can be either bipolar (±15V or up to ±16.5V) or unipolar (0V to +30V or up to +33V), depending on the power supply configuration.
- What is the maximum speed of the parallel interface?
The parallel interface operates at up to 50MHz.
- Is the DAC8728SPAG compatible with other DAC models?
Yes, it is pin-to-pin compatible with the DAC8228 (14-bit) and the DAC7728 (12-bit).
- What is the power consumption of the DAC8728SPAG in normal operation?
The power consumption is approximately 4-6 mA per channel in normal operation.
- Can the DAC8728SPAG be calibrated for better accuracy?
Yes, user calibration can be performed to achieve ±1 LSB bipolar zero/full-scale error or ±1 LSB zero-code/full-scale error.
- What is the operating temperature range of the DAC8728SPAG?
The operating temperature range is –40°C to +105°C.
- What types of applications is the DAC8728SPAG suitable for?
The DAC8728SPAG is suitable for Automatic Test Equipment, PLC and Industrial Process Control, and Communications).
- How does the asynchronous CLR input function?
The asynchronous CLR input sets the output of all eight DACs to AGND).
- What is the purpose of the VMON pin?
The VMON pin is a monitor output that connects to the individual analog outputs, the offset DAC, and the reference buffer outputs through a multiplexer).
