Overview
The DAC1220EG4, produced by Texas Instruments, is a 20-bit delta-sigma digital-to-analog converter (DAC) designed for applications requiring high precision and low power consumption. This device offers 20-bit monotonic performance over the industrial temperature range of -40°C to +85°C. It features an onboard self-calibration system that significantly reduces offset and gain errors, making it ideal for closed-loop control and high-resolution applications in various markets, including industrial process control, test and measurement, and remote or battery-powered instruments.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Resolution | 16/20 bits | ||||
| Linearity Error | ±0.0015% (20-bit mode) | % of FSR | |||
| Settling Time | 16-bit mode | 1.8 ms | 2 ms | ms | |
| Settling Time | 20-bit mode | 15 ms | ms | ||
| Output Voltage Range | 0 | 2 × VREF | V | ||
| Output Current | 0.5 mA | mA | |||
| Power Supply Voltage | 4.75 V | 5 V | 5.25 V | V | |
| Supply Current (Analog) | 16-bit mode | 360 μA | μA | ||
| Supply Current (Analog) | 20-bit mode | 460 μA | μA | ||
| Supply Current (Digital) | 140 μA | μA | |||
| Power Dissipation | Normal mode | 2.5 mW | 3.0 mW | 3.5 mW | mW |
| Power Dissipation | Sleep mode | 0.45 mW | mW |
Key Features
- Onboard Self-Calibration: The DAC1220EG4 features an onboard self-calibration system that reduces offset and gain errors, ensuring high accuracy.
- High Resolution: Offers 20-bit monotonic performance, with the option to operate in 16-bit mode for faster settling times.
- Low Power Consumption: Designed for low power consumption, with a sleep mode that reduces power dissipation to approximately 0.45 mW.
- Synchronous Serial Interface: Uses a synchronous serial interface that can be operated with two or three wires, allowing for low-cost isolation.
- Flexible Operation: Supports both unipolar and bipolar output configurations, with an output voltage range of 0 to 2 × VREF.
- High Accuracy: Achieves linearity errors as low as ±0.0015% in 20-bit mode and settling times of 15 ms for 20-bit resolution.
Applications
- Industrial Process Control: Ideal for closed-loop control applications due to its high precision and low power consumption.
- Test and Measurement: Suitable for high-resolution applications in the test and measurement market.
- Remote and Battery-Powered Instruments: Perfect for use in remote or battery-powered instruments due to its low power requirements.
- Portable Instruments: Used in portable instruments where high accuracy and low power are critical.
- Smart Transmitters: Employed in smart transmitter applications requiring precise analog output.
Q & A
- What is the resolution of the DAC1220EG4?
The DAC1220EG4 offers 20-bit resolution, with the option to operate in 16-bit mode for faster settling times.
- What is the typical linearity error of the DAC1220EG4 in 20-bit mode?
The typical linearity error is ±0.0015% of the full-scale range (FSR) in 20-bit mode.
- How long does the self-calibration process take?
The self-calibration process takes between 300ms and 500ms at a clock frequency of 2.5MHz.
- What is the output voltage range of the DAC1220EG4?
The output voltage range is nominally 0V to 2 × VREF.
- What is the maximum output current of the DAC1220EG4?
The maximum output current is 0.5 mA.
- What are the power supply requirements for the DAC1220EG4?
The device requires a power supply voltage of 4.75V to 5.25V for both analog and digital supplies.
- How much power does the DAC1220EG4 consume in sleep mode?
In sleep mode, the power dissipation is approximately 0.45 mW.
- What type of interface does the DAC1220EG4 use?
The DAC1220EG4 uses a synchronous serial interface that can be operated with two or three wires.
- What are some common applications of the DAC1220EG4?
Common applications include industrial process control, test and measurement, remote and battery-powered instruments, and smart transmitters.
- What is the operating temperature range of the DAC1220EG4?
The specified performance temperature range is -40°C to +85°C.
