Overview
The DAC7678SRGER is a low-power, voltage-output, octal-channel 12-bit digital-to-analog converter (DAC) produced by Texas Instruments. This device is designed for high accuracy and low power consumption, making it ideal for portable, battery-operated equipment. It features an internal 2.5V reference voltage, which can be disabled, and provides a full-scale output voltage range of up to 5V. The DAC7678 is monotonic, ensuring good linearity and minimizing code-to-code transient voltages (glitch). It operates over a wide power-supply range from +2.7V to +5.5V and supports a 2-wire serial interface compatible with I2C, allowing multiple devices to share the same bus.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12 | Bits |
| Relative Accuracy | ±0.3 to ±1 | LSB |
| Differential Nonlinearity | ±0.1 to ±0.25 | LSB |
| Offset Error | 0.5 to ±4 | mV |
| Full-Scale Error | ±0.03 to ±0.2 | % of FSR |
| Output Voltage Range | 0 to AVDD | V |
| Output Voltage Settling Time | 7 to 12 | μs |
| Slew Rate | 0.75 | V/μs |
| Power Consumption (per channel) | 0.13mA (at 5V without internal reference) | mA |
| Operating Temperature Range | –40 to +125 | °C |
| Package Types | TSSOP-16, QFN-24 |
Key Features
- Internal 2.5V reference voltage with ±5mV initial accuracy and 5ppm/°C temperature drift (typical).
- Ultra-low power operation: 0.13mA per channel at 5V (without internal reference current).
- Wide power-supply range: +2.7V to +5.5V.
- 2-wire serial interface (I2C-compatible) with clock rates up to 3.4MHz.
- On-chip output buffer amplifier with rail-to-rail operation.
- Power-on reset to zero scale or mid-scale.
- Programmable attenuation and power-down feature reducing current consumption to 0.42μA at 5V.
Applications
- Portable Instrumentation
- Closed-Loop Servo-Control
- Process Control
- Data Acquisition Systems
- PC Peripherals
Q & A
- What is the resolution of the DAC7678? The DAC7678 has a resolution of 12 bits.
- What is the typical temperature drift of the internal reference voltage? The internal reference voltage has a typical temperature drift of 5ppm/°C.
- What is the power consumption per channel at 5V without the internal reference? The power consumption per channel is 0.13mA at 5V without the internal reference.
- What is the operating temperature range of the DAC7678? The operating temperature range is –40°C to +125°C.
- What types of packages are available for the DAC7678? The DAC7678 is available in TSSOP-16 and QFN-24 packages.
- What is the maximum clock rate for the serial interface? The serial interface supports clock rates up to 3.4MHz.
- Does the DAC7678 have a power-down feature? Yes, the DAC7678 has a power-down feature that reduces current consumption to 0.42μA at 5V.
- What is the output voltage settling time for the DAC7678? The output voltage settling time is 7 to 12 μs.
- Is the DAC7678 monotonic? Yes, the DAC7678 is monotonic, ensuring good linearity and minimizing code-to-code transient voltages (glitch).
- What are some typical applications of the DAC7678? Typical applications include portable instrumentation, closed-loop servo-control, process control, data acquisition systems, and PC peripherals.
