Overview
The AD7839AS, produced by Analog Devices Inc., is an octal 13-bit, parallel input, voltage-output Digital-to-Analog Converter (DAC). This integrated circuit is designed to provide high precision and versatility in various analog output applications. The AD7839AS features eight independent DAC channels, each capable of producing output voltages with a full-scale range of ±10 V from reference voltages of ±5 V. This device is particularly useful in systems requiring multiple analog outputs with precise control and high resolution.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Number of DACs | Eight independent DAC channels | 8 |
| Resolution | 13-bit | 13 bits |
| Output Voltage Range | Full-scale range | ±10 V |
| Reference Voltage Range | Reference voltages for DACs | ±5 V |
| Logic Power Supply | VCC | +5 V ± 5% |
| Analog Power Supplies | VDD and VSS | +15 V ± 5%, -15 V ± 5% |
| Package Type | 44-lead MQFP | 44-MQFP |
| Data Input | Parallel input, 13-bit wide word | DB0 to DB12 |
| Address Inputs | A0, A1, A2 for selecting input registers | A0, A1, A2 |
| Load DAC Input | LDAC (active low) | Active low |
| Clear Input | CLR (asynchronous, active low) | Active low |
Key Features
- High Resolution: Each DAC channel has a 13-bit resolution, providing precise analog output control.
- Multiple Channels: Eight independent DAC channels allow for simultaneous control of multiple analog outputs.
- Buffered Outputs: Each DAC output is buffered with a gain-of-two amplifier, enabling external DAC offset voltage insertion.
- Flexible Power Supplies: The device operates with both positive and negative analog power supplies (+15 V and -15 V) and a +5 V logic power supply.
- Parallel Data Input: Accepts straight 13-bit parallel words for data loading.
- Addressable Registers: Uses address inputs (A0, A1, A2) to select one of the eight input registers for data transfer.
- Clear Functionality: Asynchronous clear input (CLR) allows switching all analog outputs to an externally set potential.
Applications
- Industrial Control Systems: Suitable for applications requiring multiple precise analog outputs, such as in process control and automation.
- Medical Devices: Can be used in medical equipment that needs high-resolution analog outputs for various diagnostic and therapeutic purposes.
- Aerospace and Defense: Applicable in systems requiring high reliability and precision in analog output control.
- Test and Measurement Equipment: Ideal for instruments that need to generate multiple precise analog signals.
- Automotive Systems: Used in automotive control systems that require multiple analog outputs for various functions.
Q & A
- What is the resolution of each DAC channel in the AD7839AS?
Each DAC channel in the AD7839AS has a 13-bit resolution.
- How many independent DAC channels does the AD7839AS have?
The AD7839AS features eight independent DAC channels.
- What is the output voltage range of the AD7839AS?
The output voltage range is ±10 V from reference voltages of ±5 V.
- What type of package does the AD7839AS come in?
The AD7839AS is available in a 44-lead MQFP package.
- How does the AD7839AS accept data?
The AD7839AS accepts data through parallel input, using a 13-bit wide word.
- What is the purpose of the LDAC input?
The LDAC input is used to transfer the contents of the input registers to the DAC registers when taken low.
- What is the function of the CLR input?
The CLR input, when taken low, switches all analog outputs to the externally set potential on the relevant DUTGND pin.
- What are the power supply requirements for the AD7839AS?
The device requires a +5 V logic power supply (VCC), and +15 V and -15 V analog power supplies (VDD and VSS).
- How are the DAC outputs updated?
The DAC outputs are updated on reception of new data into the DAC registers, and all outputs can be updated simultaneously by taking the LDAC input low.
- What is the significance of the address inputs (A0, A1, A2)?
The address inputs (A0, A1, A2) are used to select one of the eight input registers for data transfer.
