Overview
The DAC8831ICDRG4, produced by Texas Instruments, is a 16-bit, single-channel, serial-input, voltage-output digital-to-analog converter (DAC). This device operates on a single power supply ranging from 2.7 V to 5.5 V and is known for its ultra-low power consumption, typically around 5 μA. The DAC8831 is designed with a power-on reset function, ensuring a known power-up state, and it supports both unipolar and bipolar output modes when connected to an external buffer.
The device features a segmented DAC architecture, consisting of two matched DAC sections, and uses a 12-bit R-2R ladder network along with 15 equal segments driven by the four most significant bits of the 16-bit data word. The digital interface is compatible with SPI, QSPI, Microwire, and TI DSP interfaces, operating at speeds up to 50 M-bits/sec.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Resolution | 16 | bits | |||
| Linearity Error | ±0.5 | ±2 | LSB | ||
| Differential Linearity Error | ±0.5 | ±1 | LSB | ||
| Gain Error | TA = +25°C | ±1 | ±5 | LSB | |
| Gain Drift | TA = +25°C | ±0.1 | ±0.25 | ppm/°C | |
| Zero Code Error | TA = +25°C | ±1 | ±2 | LSB | |
| Output Impedance | 6.25 | kΩ | |||
| Settling Time | To 1/2 LSB of FS, CL = 10 pF | 1 | μs | ||
| Slew Rate | CL = 10 pF | 25 | V/μs | ||
| Power-Supply Voltage | 2.7 | 5.5 | V | ||
| Power-Supply Current | VDD = 3 V | 5 | 20 | μA | |
| Operating Temperature Range | –40 | +85 | °C |
Key Features
- Ultra-Low Power Consumption: Typically 5 μA, making it suitable for battery-powered devices.
- High Resolution: 16-bit resolution for precise analog output.
- Single-Supply Operation: Operates from 2.7 V to 5.5 V.
- Unipolar and Bipolar Output Modes: The DAC8831 supports both unipolar (0 V to +VREF) and bipolar (±VREF) output modes with an external buffer.
- Fast Interface: Compatible with SPI, QSPI, Microwire, and TI DSP interfaces, operating at speeds up to 50 M-bits/sec.
- Low Output Impedance: 6.25 kΩ output impedance.
- Fast Settling Time: Settles to 1/2 LSB of full scale in 1 μs with a 10 pF load.
- Power-On Reset: Ensures a known power-up state, resetting to zero code or –VREF in bipolar mode.
- LDAC Pin for Asynchronous Update: Allows the DAC latch to be updated asynchronously.
Applications
- Industrial Control Systems: For precise analog output in control systems.
- Medical Devices: Suitable for medical equipment requiring low power and high precision.
- Aerospace and Defense: Used in various military and aerospace applications due to its reliability and performance.
- Automotive Systems: For automotive control systems that require low power consumption and high accuracy.
- Portable Electronics: Ideal for battery-powered devices such as handheld instruments and portable medical devices.
Q & A
- What is the resolution of the DAC8831ICDRG4?
The DAC8831ICDRG4 has a 16-bit resolution.
- What is the operating voltage range of the DAC8831ICDRG4?
The device operates on a single power supply ranging from 2.7 V to 5.5 V.
- What are the output modes supported by the DAC8831ICDRG4?
The DAC8831ICDRG4 supports both unipolar (0 V to +VREF) and bipolar (±VREF) output modes.
- How does the DAC8831ICDRG4 handle power-on reset?
The device ensures a known power-up state by resetting to zero code or –VREF in bipolar mode.
- What is the typical power consumption of the DAC8831ICDRG4?
The device typically consumes around 5 μA.
- What is the settling time of the DAC8831ICDRG4?
The settling time is 1 μs to 1/2 LSB of full scale with a 10 pF load.
- What is the slew rate of the DAC8831ICDRG4?
The slew rate is 25 V/μs with a 10 pF load.
- Is the DAC8831ICDRG4 compatible with any specific digital interfaces?
Yes, it is compatible with SPI, QSPI, Microwire, and TI DSP interfaces.
- What is the output impedance of the DAC8831ICDRG4?
The output impedance is 6.25 kΩ.
- What is the operating temperature range of the DAC8831ICDRG4?
The operating temperature range is from –40°C to +85°C.
