Overview
The DAC7678SPWR, produced by Texas Instruments, is a low-power, voltage-output, octal-channel 12-bit digital-to-analog converter (DAC). This device is designed for high accuracy and low power consumption, making it ideal for portable, battery-operated equipment. The DAC7678 includes a 2.5V internal reference (disabled by default) and features a versatile 2-wire serial interface that is I2C-compatible, operating at clock rates up to 3.4MHz.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Resolution | 12 | Bits | |
| Relative Accuracy | ±0.3 to ±1 | LSB | Measured by the line passing through codes 30 and 4050 |
| Differential Nonlinearity | ±0.1 to ±0.25 | LSB | 12-bit monotonic |
| Offset Error | 0.5 to ±4 | mV | Extrapolated from two-point line, unloaded |
| Full-Scale Output Voltage Range | 0 to AVDD | V | |
| Output Voltage Settling Time | 7 to 12 | μs | RL = 1MΩ, CL = 470 pF |
| Slew Rate | 0.75 | V/μs | RL = ∞ |
| Power Supply Range | +2.7V to +5.5V | V | |
| Temperature Range | –40°C to +125°C | °C | |
| Internal Reference Voltage | 2.495 to 2.505 | V | TA = +25°C |
| Internal Reference Temperature Drift | 5 to 25 | ppm/°C | |
| Power Consumption (typical) | 0.13mA/Channel at 5V (without internal reference current) | mA | |
| Power-Down Current (typical) | 0.42μA at 5V | μA |
Key Features
- Low power operation: 0.13mA per channel at 5V (without internal reference current)
- Internal 2.5V reference with ±5mV initial accuracy and 5ppm/°C temperature drift (typical)
- Monotonic and very good linearity with minimal code-to-code transient voltages (glitch energy: 0.15nV-s)
- 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
- Available in TSSOP-16 and QFN-24 packages
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 power consumption of the DAC7678 per channel?
The typical power consumption is 0.13mA per channel at 5V (without internal reference current).
- What is the temperature range of the DAC7678?
The device operates over a temperature range of –40°C to +125°C.
- Does the DAC7678 have an internal reference voltage?
Yes, it includes a 2.5V internal reference (disabled by default).
- What is the settling time for the output voltage of the DAC7678?
The output voltage settling time is 7 to 12 μs (RL = 1MΩ, CL = 470 pF).
- Is the DAC7678 compatible with other DAC models from Texas Instruments?
Yes, it is pin- and function-compatible with DAC5578, DAC6578, and DAC7578.
- What is the slew rate of the DAC7678?
The slew rate is 0.75 V/μs (RL = ∞).
- How does the DAC7678 handle power-on reset?
The device has a power-on reset circuit that ensures the DAC output powers up to either zero-scale or mid-scale until a valid code is written to the device.
- What is the maximum current that the DAC7678 can source or sink?
The device can source or sink up to 20mA.
- What are the package options for the DAC7678?
The DAC7678 is available in TSSOP-16 and QFN-24 packages.
