Overview
The AD7847BR, produced by Analog Devices Inc., is a complete, dual 12-bit multiplying digital-to-analog converter (DAC) with integrated output amplifiers on a monolithic CMOS chip. This device is part of the AD7837/AD7847 series and is known for its high precision and reliability. It is microprocessor compatible, featuring high-speed data latches and interface logic, making it suitable for a variety of applications requiring precise analog output control.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Number of Bits | Resolution of the DAC | 12-bit |
| Number of D/A Converters | Number of independent DACs | 2 |
| Settling Time | Time for the output to settle to within 1/2 LSB of the final value | 5 µs |
| Output Type | Type of analog output | Voltage - Buffered |
| Differential Output | Presence of differential output | No |
| Data Interface | Type of data interface | Parallel |
| Reference Type | Type of reference voltage | External |
| Voltage - Supply, Analog | Analog supply voltage range | ±14.25 V ~ 15.75 V |
| INL/DNL (LSB) | Integral and Differential Non-Linearity | ±0.5 (Max), ±1 (Max) |
| Architecture | DAC architecture | R-2R |
| Operating Temperature | Operating temperature range | -40°C ~ 85°C |
| Package | Package type and dimensions | 24-SOIC (0.295", 7.50mm Width) |
Key Features
- Dual 12-Bit DACs: The AD7847BR features two independent 12-bit DACs, each with its own chip select input and a common write input, allowing for flexible control over the analog outputs.
- High-Speed Data Latches: The device includes high-speed data latches and interface logic, making it compatible with microprocessors and suitable for high-speed applications.
- Output Amplifiers: The integrated output amplifiers are capable of developing ±10 V across a 2 kΩ load and are internally compensated with low input offset voltage due to laser trimming.
- Low Offset Errors: The novel low leakage configuration ensures low offset errors over the specified temperature range.
- External Reference: The device uses an external reference voltage, which can be an AC or DC signal, providing flexibility in application design.
- LC²MOS Technology: Fabricated in Linear Compatible CMOS (LC²MOS), combining precision bipolar circuits with low power CMOS logic.
Applications
- Industrial Control Systems: The AD7847BR is suitable for industrial control systems that require precise analog output control.
- Medical Equipment: Its high precision and reliability make it a good fit for medical equipment where accurate analog signals are crucial.
- Aerospace and Defense: The device's robust specifications and operating temperature range make it suitable for aerospace and defense applications.
- Automotive Systems: It can be used in automotive systems that require high-precision analog output, such as in engine control units or other automotive electronics.
- Test and Measurement Equipment: The AD7847BR is also used in test and measurement equipment where precise analog signals are necessary.
Q & A
- What is the resolution of the AD7847BR DACs?
The AD7847BR features dual 12-bit DACs.
- How many independent DACs does the AD7847BR have?
The device has two independent DACs.
- What is the settling time of the AD7847BR?
The settling time is 5 µs.
- What type of data interface does the AD7847BR use?
The device uses a parallel data interface.
- What is the operating temperature range of the AD7847BR?
The operating temperature range is -40°C to 85°C.
- What is the package type of the AD7847BR?
The device is packaged in a 24-SOIC package.
- Does the AD7847BR require external user trims for full performance?
No, the AD7847BR does not require external user trims to achieve full specified performance.
- What is the maximum output voltage of the AD7847BR?
The output amplifiers can develop ±10 V across a 2 kΩ load.
- Is the AD7847BR microprocessor compatible?
Yes, the AD7847BR is microprocessor compatible with high-speed data latches and interface logic.
- What technology is used in the fabrication of the AD7847BR?
The device is fabricated in Linear Compatible CMOS (LC²MOS) technology.
