Overview
The DAC1220E/2K5 is a 20-bit digital-to-analog (D/A) converter produced by Texas Instruments. It offers high precision and low power consumption, making it suitable for a variety of applications requiring high-resolution analog output. The device utilizes delta-sigma technology to ensure 20-bit monotonic performance over a temperature range of –40°C to +85°C. It features on-chip calibration circuitry that significantly reduces offset and gain errors, enhancing its accuracy and reliability.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Resolution | 16/20 bits | ||||
| Settling Time | 16-bit mode | 1.8 ms | 2 ms | ms | |
| 20-bit mode | 15 ms | ms | |||
| Linearity Error | ±0.0015% | % | |||
| Output Voltage | 0 | 2 × VREF | V | ||
| Output Current | 0.5 mA | mA | |||
| Power Supply Voltage | 4.75 V | 5.0 V | 5.25 V | V | |
| Supply Current (Analog) | 16-bit mode | 360 µA | µA | ||
| 20-bit mode | 460 µA | µA | |||
| Supply Current (Digital) | 140 µA | µA | |||
| Power Dissipation | 16-bit mode | 2.5 mW | 3.0 mW | mW | |
| 20-bit mode | 3.0 mW | mW | |||
| Sleep mode | 0.45 mW | mW | |||
| Temperature Range | –40°C | +85°C | °C |
Key Features
- 20-Bit Monotonicity: Ensured over the temperature range of –40°C to +85°C.
- Low Power Consumption: Operates at 2.5 mW in normal mode and 0.45 mW in sleep mode.
- Voltage Output: The output range is two times the external reference voltage.
- Settling Time: 2 ms to 0.012% for 16-bit mode and 15 ms to 0.003% for 20-bit mode.
- On-Chip Calibration: Reduces offset and gain errors significantly.
- Synchronous Serial Interface: Can be operated with just two wires for single-converter applications, allowing low-cost isolation.
- Package: Available in an SSOP-16 package.
Applications
- Process Control: Ideal for closed-loop control applications in industrial process control.
- ATE Pin Electronics: Suitable for automated test equipment.
- Closed-Loop Servo Control: Used in servo control systems requiring high precision.
- Smart Transmitters: Employed in smart transmitter applications.
- Portable Instruments: Ideal for battery-powered instruments and isolated systems.
Q & A
- What is the resolution of the DAC1220E/2K5? The resolution can be programmed to either 16 bits or 20 bits.
- What is the settling time for the 20-bit mode? The settling time for the 20-bit mode is typically 15 ms to 0.003%.
- What is the maximum linearity error of the DAC1220E/2K5? The maximum linearity error is ±0.0015%.
- What is the output voltage range of the DAC1220E/2K5? The output voltage range is nominally 0V to 2 × VREF.
- How much power does the DAC1220E/2K5 consume in normal operation? It consumes 2.5 mW in 16-bit mode and 3.0 mW in 20-bit mode.
- What is the temperature range for the specified performance of the DAC1220E/2K5? The specified performance is over the temperature range of –40°C to +85°C.
- What type of interface does the DAC1220E/2K5 use? It uses a synchronous serial interface.
- Can the DAC1220E/2K5 be used in multiple converter applications? Yes, it can be used in multiple converter applications with a CS signal for selection.
- What is the package type of the DAC1220E/2K5? It is available in an SSOP-16 package.
- How does the on-chip calibration of the DAC1220E/2K5 work? The on-chip calibration circuitry measures the DAC output and calculates the appropriate gain and offset calibration constants to reduce errors.
