Overview
The AD7808BR is a high-performance digital-to-analog converter (DAC) produced by Analog Devices Inc. This octal 10-bit DAC is part of the AD7804/AD7805/AD7808/AD7809 family, known for its serial load capabilities and robust performance. The AD7808BR operates from a +3.3 V to +5 V power supply and includes an on-chip reference, making it suitable for a variety of precision analog applications.
Key Specifications
| Parameter | Units | Comments |
|---|---|---|
| Resolution | 10 Bits | |
| Relative Accuracy | ±4 LSB max | |
| Gain Error | ±3 % FSR max | |
| Bias Offset Error | ±60 mV max | DAC Code = 0.5 Full Scale |
| Zero-Scale Error | ±35 mV max | DAC Code = 000H for Offset Binary |
| Minimum Load Resistance | 2 kΩ min | |
| Sub DAC Resolution | 8 Bits | |
| Differential Nonlinearity | ±0.125 LSB typ, ±0.5 LSB max | Refers to an LSB of the Main DAC |
| Output Voltage Range | VBIAS ± 15/16 × VBIAS | |
| Input Leakage Current | ±10 µA max | |
| Input Capacitance | 8 pF max | |
| VDD (AVDD and DVDD) | 3 V to 5.5 V | |
| IDD (AIDD Plus DIDD) | 18 mA max (Normal Mode), 250 µA max (System Standby), 1 µA max (Power-Down) | Excluding Load Currents |
| Operating Temperature | -40°C to +85°C | |
| Package/Case | 24-SOIC (0.295", 7.50mm Width) | |
| Number of D/A Converters | 8 | |
| Data Interface | SPI | |
| Settling Time | 4 µs |
Key Features
- On-Chip Reference: The AD7808BR includes an on-chip reference, simplifying the design and reducing the need for external components.
- Serial Load Capabilities: The DAC supports serial data loading, which is useful for applications requiring multiple DACs to be controlled from a single serial interface.
- Double Buffered Data Inputs: All analog outputs can be simultaneously updated using the asynchronous LDAC input, ensuring synchronized output changes.
- System and Channel Control Registers: The device features system control and channel control registers, allowing for comprehensive control over all DACs in the package and individual DACs respectively.
- Power-Down and Standby Modes: The AD7808BR offers power-down and system standby modes to reduce power consumption when not in active use.
- High Accuracy and Linearity: The DAC provides high relative accuracy and low differential nonlinearity, ensuring precise analog output signals.
Applications
- Optical Disk Drives: The AD7808BR is suitable for precision voltage control in optical disk drives.
- Instrumentation and Communication Systems: Its high accuracy and linearity make it ideal for various instrumentation and communication systems.
- Process Control and Voltage Setpoint Control: The DAC can be used in process control systems and for setting precise voltage levels.
- Trim Potentiometer Replacement: It can replace trim potentiometers in many applications, offering digital control over analog outputs.
- Automatic Calibration: The AD7808BR can be used in systems that require automatic calibration due to its precision and programmability.
Q & A
- What is the resolution of the AD7808BR DAC?
The AD7808BR has a resolution of 10 bits.
- What is the operating voltage range of the AD7808BR?
The AD7808BR operates from a +3.3 V to +5 V power supply.
- Does the AD7808BR have an on-chip reference?
Yes, the AD7808BR includes an on-chip reference.
- What is the data interface of the AD7808BR?
The AD7808BR uses a Serial Peripheral Interface (SPI) for data loading.
- What is the settling time of the AD7808BR?
The settling time of the AD7808BR is 4 µs.
- Can the AD7808BR be used in power-down mode?
Yes, the AD7808BR has a power-down mode that reduces current consumption to 1 µA at +25°C.
- What are the typical applications of the AD7808BR?
The AD7808BR is typically used in optical disk drives, instrumentation and communication systems, process control, and as a replacement for trim potentiometers.
- What is the package type of the AD7808BR?
The AD7808BR is available in a 24-SOIC package.
- What is the operating temperature range of the AD7808BR?
The AD7808BR operates from -40°C to +85°C.
- Does the AD7808BR support simultaneous output updates?
Yes, the AD7808BR supports simultaneous output updates using the asynchronous LDAC input.
