Overview
The AD5668BRUZ-2REEL7 is a 16-bit, octal, buffered voltage-output Digital-to-Analog Converter (DAC) produced by Analog Devices Inc. This device is part of the AD5628/AD5648/AD5668 family, known for their low power consumption and high precision. The AD5668 operates from a single 2.7 V to 5.5 V supply and is guaranteed monotonic by design, ensuring accurate and reliable output.
The device features an on-chip reference with an internal gain of 2, allowing for full-scale output ranges of either 2.5 V or 5 V, depending on the reference configuration. The internal reference is off at power-up, enabling the use of an external reference if required. It can be enabled via a software write command.
The AD5668 includes a power-on reset circuit that sets the DAC output to 0 V or midscale at power-up, maintaining this state until a valid write sequence is executed. Additionally, it has a power-down feature that significantly reduces current consumption to 400 nA at 5 V.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Resolution | 16 bits | ||||
| Relative Accuracy | ±8 | ±16 | LSB | See Figure 7 | |
| Differential Nonlinearity | ±1 | ±1 | LSB | Guaranteed monotonic by design | |
| Zero-Code Error | 6 | 19 | mV | All 0s loaded to DAC register | |
| Full-Scale Error | -0.2 | -1 | % FSR | All 1s loaded to DAC register | |
| Gain Error | ±1 | ±1 | % FSR | ||
| Offset Error | ±6 | ±19 | mV | ||
| VDD | 2.7 | 5.5 | V | All digital inputs at 0 or VDD, DAC active, excludes load current | |
| IDD (Normal Mode) | 1.0 | 1.5 | 1.8 | mA | Internal reference off/on, VDD = 2.7 V to 3.6 V |
| IDD (All Power-Down Modes) | 0.2 | 1 | µA | VDD = 2.7 V to 3.6 V | |
| Output Voltage Settling Time | 2.5 | 7 | µs | ¼ to ¾ scale settling to ±2 LSB | |
| Slew Rate | 1.2 | V/µs | |||
Key Features
- On-Chip Reference: Internal reference with an internal gain of 2, providing full-scale output ranges of 2.5 V or 5 V.
- Power-On Reset: Ensures DAC output powers up to 0 V or midscale and remains at this level until a valid write sequence is executed.
- Power-Down Capability: Reduces current consumption to 400 nA at 5 V, with software-selectable output loads.
- Serial Interface: Versatile 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interface standards, operating at clock rates up to 50 MHz.
- Output Amplifier: On-chip precision output amplifier enabling rail-to-rail output swing.
- Simultaneous Update: Outputs of all DACs can be updated simultaneously using the LDAC function, with user-selectable DAC channels.
- Asynchronous CLR: Updates all DACs to a user-programmable code—zero scale, midscale, or full scale.
Applications
The AD5668BRUZ-2REEL7 is suitable for a variety of applications that require high precision and low power consumption, such as:
- Industrial Control Systems: For precise control and monitoring in industrial environments.
- Medical Devices: Where accurate and reliable analog output is crucial.
- Aerospace and Defense: For applications requiring high reliability and precision.
- Automotive Systems: For control and monitoring in automotive electronics.
- Test and Measurement Equipment: For generating precise analog signals.
Q & A
- What is the resolution of the AD5668BRUZ-2REEL7?
The AD5668BRUZ-2REEL7 has a resolution of 16 bits.
- What is the operating voltage range of the AD5668BRUZ-2REEL7?
The device operates from a single 2.7 V to 5.5 V supply.
- What is the full-scale output range of the AD5668BRUZ-2REEL7?
The full-scale output range can be either 2.5 V or 5 V, depending on the reference configuration.
- Does the AD5668BRUZ-2REEL7 have a power-on reset feature?
Yes, the device has a power-on reset circuit that sets the DAC output to 0 V or midscale at power-up.
- What is the current consumption in power-down mode?
The current consumption in power-down mode is typically 400 nA at 5 V.
- What type of serial interface does the AD5668BRUZ-2REEL7 use?
The device uses a versatile 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interface standards.
- Can the outputs of all DACs be updated simultaneously?
Yes, the outputs of all DACs can be updated simultaneously using the LDAC function.
- Is the AD5668BRUZ-2REEL7 guaranteed monotonic by design?
Yes, the device is guaranteed monotonic by design.
- What is the slew rate of the AD5668BRUZ-2REEL7?
The slew rate is 1.2 V/µs.
- What is the output voltage settling time of the AD5668BRUZ-2REEL7?
The output voltage settling time is 2.5 µs to 7 µs for ¼ to ¾ scale settling to ±2 LSB.
