Overview
The DAC1220E/2K5G4, produced by Texas Instruments, is a 20-bit digital-to-analog converter (DAC) that utilizes delta-sigma technology to achieve high precision and linearity. This device is designed for applications requiring extremely high resolution and is available in an SSOP-16 package. It operates over an industrial temperature range of -40°C to +85°C and offers low power consumption, making it suitable for battery-powered instruments and isolated systems.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Resolution | 16/20 bits | ||||
| Linearity Error | ±15 ppm of FSR | ||||
| Offset Error | ±60 ppm of FSR | ||||
| Gain Error | ±150 ppm of FSR | ||||
| Power Supply Voltage | 4.75 V | 5.0 V | 5.25 V | V | |
| Power Dissipation | 2.5 mW | 3.5 mW | mW | ||
| Settling Time (20-bit mode) | 15 ms | ms | |||
| Output Voltage Range | 0 V | 2 × VREF | V | ||
| Output Current | 0.5 mA | mA |
Key Features
- High Resolution: 20-bit monotonic performance over the specified temperature range.
- Low Power Consumption: 2.5 mW in normal operation and 0.45 mW in sleep mode.
- On-Chip Calibration: Reduces low offset and gain errors.
- Flexible Operation: Can be operated in 16-bit or 20-bit mode, with adjustable settling time.
- Synchronous Serial Interface: Allows for low-cost isolation and can be operated with just two wires in single-converter applications.
- High Linearity and Accuracy: Maximum linearity error of ±0.0015% typical.
Applications
- Process Control: Ideal for closed-loop control applications in the industrial process control market.
- Test and Measurement: High-resolution applications in the test and measurement market.
- Portable Instruments: Suitable for battery-powered instruments.
- Isolated Systems: Designed for use in isolated systems and remote applications.
- ATE Pin Electronics: Used in automated test equipment.
- Smart Transmitters: Applicable in smart transmitter systems.
Q & A
- What is the resolution of the DAC1220E/2K5G4?
The DAC1220E/2K5G4 has a resolution of 20 bits, but it can also be operated in 16-bit mode for faster settling times.
- What is the operating temperature range of the DAC1220E/2K5G4?
The device operates over an industrial temperature range of -40°C to +85°C.
- How much power does the DAC1220E/2K5G4 consume?
The device consumes 2.5 mW in normal operation and 0.45 mW in sleep mode.
- What is the output voltage range of the DAC1220E/2K5G4?
The output voltage range is nominally 0V to 2 × VREF.
- Does the DAC1220E/2K5G4 have on-chip calibration?
Yes, the DAC1220E/2K5G4 features on-chip calibration to reduce offset and gain errors.
- What type of interface does the DAC1220E/2K5G4 use?
The device uses a synchronous serial interface, which can be operated with just two wires in single-converter applications.
- What are the typical applications of the DAC1220E/2K5G4?
It is used in process control, test and measurement, portable instruments, isolated systems, ATE pin electronics, and smart transmitters.
- How long does the self-calibration process take?
The self-calibration process takes between 300ms and 500ms at a clock frequency of 2.5MHz.
- Can the DAC1220E/2K5G4 be used in battery-powered devices?
Yes, it is suitable for battery-powered instruments due to its low power consumption.
- Is the DAC1220E/2K5G4 still available for purchase?
No, the DAC1220E/2K5G4 is discontinued and no longer carried by Digi-Key, but substitutes are available.
