Overview
The AD5668ARUZ-6 is a 16-bit, octal, buffered voltage-output Digital-to-Analog Converter (DAC) produced by Analog Devices Inc. This device operates from a single 2.7 V to 5.5 V supply and is known for its low power consumption and high accuracy. The AD5668 is part of the AD5628/AD5648/AD5668 family, which includes devices with 12-bit, 14-bit, and 16-bit resolutions, respectively. The AD5668 is particularly notable for its on-chip reference with an internal gain of 2, allowing for full-scale output ranges of 2.5 V or 5 V depending on the reference configuration.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Conditions/Comments |
|---|---|---|---|---|---|
| Resolution | 16 | - | - | Bits | - |
| Relative Accuracy | ±8 | - | ±32 | LSB | - |
| Differential Nonlinearity | ±1 | - | ±1 | LSB | Guaranteed monotonic by design |
| Zero-Code Error | 1 | - | 9 | 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 | - |
| Gain Temperature Coefficient | ±2.5 | - | ±2.5 | ppm/°C | - |
| Offset Error | ±1 | - | ±9 | mV | - |
| VDD | 2.7 | - | 5.5 | V | All digital inputs at 0 or VDD, DAC active, excludes load current |
| IDD (Normal Mode) | 1.2 | - | 2.6 | mA | Internal reference on/off, 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 |
Key Features
- On-Chip Reference: The AD5668 includes an on-chip reference with an internal gain of 2, providing full-scale output ranges of 2.5 V or 5 V.
- Low Power Consumption: The device operates with low current consumption, typically 1.2 mA to 2.6 mA in normal mode and as low as 400 nA in power-down mode.
- Guaranteed Monotonicity: The DAC is guaranteed monotonic by design, ensuring that the output voltage always increases as the digital input code increases.
- Power-On Reset and Power-Down: The device features a power-on reset circuit that ensures the DAC output powers up to 0 V or midscale and remains at this level until a valid write takes place. It also includes a power-down feature with software-selectable output loads.
- Simultaneous Update: The outputs of all DACs can be updated simultaneously using the LDAC function, with user-selectable DAC channels.
- Rail-to-Rail Operation: The output amplifier has rail-to-rail operation, allowing the output voltage to swing from 0 V to VDD.
Applications
- Process Control: Suitable for precise control in industrial processes.
- Data Acquisition Systems: Used in systems that require accurate analog output from digital signals.
- Portable Battery-Powered Instruments: Ideal for devices that need low power consumption and high accuracy.
- Digital Gain and Offset Adjustment: Useful in applications requiring adjustable gain and offset.
- Programmable Voltage and Current Sources: Can be used to generate precise voltage or current levels.
- Programmable Attenuators: Suitable for applications needing adjustable attenuation.
Q & A
- What is the resolution of the AD5668ARUZ-6?
The AD5668ARUZ-6 has a resolution of 16 bits.
- What is the operating voltage range of the AD5668ARUZ-6?
The device operates from a single 2.7 V to 5.5 V supply.
- What is the typical current consumption of the AD5668ARUZ-6 in normal mode?
The typical current consumption is between 1.2 mA and 2.6 mA, depending on whether the internal reference is on or off.
- Does the AD5668ARUZ-6 have a power-down feature?
Yes, the device has a power-down feature that reduces current consumption to as low as 400 nA at 5 V.
- What is the full-scale output range of the AD5668ARUZ-6?
The full-scale output range can be either 2.5 V or 5 V, depending on the reference configuration.
- Is the AD5668ARUZ-6 guaranteed monotonic?
Yes, the device is guaranteed monotonic by design.
- What is the purpose of the LDAC function in the AD5668ARUZ-6?
The LDAC function allows the outputs of all DACs to be updated simultaneously, with user-selectable DAC channels.
- Can the AD5668ARUZ-6 use an external reference?
Yes, the device allows the use of an external reference, and the on-board reference is off at power-up.
- What is the typical power-up time of the AD5668ARUZ-6 coming out of power-down mode?
The typical power-up time is 4 μs.
- What are some common applications of the AD5668ARUZ-6?
Common applications include process control, data acquisition systems, portable battery-powered instruments, digital gain and offset adjustment, programmable voltage and current sources, and programmable attenuators.
