Overview
The AD7840ARS is a fast, complete 14-bit voltage output Digital-to-Analog Converter (DAC) produced by Analog Devices Inc. This component is designed to provide high accuracy and versatility in various digital signal processing applications. It features a 14-bit DAC, a 3 V buried Zener reference, a DAC output amplifier, and high-speed control logic. The AD7840ARS is fabricated using linear compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low power CMOS logic.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Bits | 14 | |
| Output Type | Voltage - Buffered | |
| Differential Output | No | |
| Data Interface | Parallel, Serial | |
| Reference Type | External, Internal | |
| Voltage Supply (Analog) | ±5 V | |
| Settling Time | 4 µs | |
| Integral Non-Linearity (INL)/Differential Non-Linearity (DNL) | ±2 (Max), ±0.9 (Max) | LSB |
| Architecture | R-2R | |
| Operating Temperature | -25°C to 85°C | |
| Signal-to-Noise Ratio | 80 dB | |
| Power Consumption | 70 mW (typical) |
Key Features
- Complete 14-Bit D/A Function: The AD7840ARS provides a complete function for creating AC signals and DC voltages to 14-bit accuracy, including an on-chip reference, an output buffer amplifier, and a 14-bit DAC.
- Dynamic Specifications: Fully specified for dynamic performance parameters such as signal-to-noise ratio and harmonic distortion, making it suitable for DSP users.
- Fast and Versatile Interface: Capable of 14-bit parallel and serial interfacing, with data setup times of 21 ns and write pulse widths of 45 ns, making it compatible with modern 16-bit microprocessors and digital signal processors.
- Low Power Consumption: Operates with a typical power consumption of 70 mW.
- High-Speed Data Transfer: In serial mode, the maximum serial data clock rate can be as high as 6 MHz.
Applications
- Digital Signal Processing (DSP): The AD7840ARS is designed to interface with high-speed DSP processors, making it ideal for applications requiring high-speed data conversion.
- Audio and Video Systems: Suitable for generating high-quality audio and video signals due to its high signal-to-noise ratio and low harmonic distortion.
- Industrial Control Systems: Can be used in industrial control systems where precise analog output is required.
- Medical Equipment: Applicable in medical devices that require accurate and reliable analog signal generation.
Q & A
- What is the resolution of the AD7840ARS DAC?
The AD7840ARS has a resolution of 14 bits.
- What are the voltage supply requirements for the AD7840ARS?
The AD7840ARS operates from ±5 V analog voltage supplies.
- What are the interface options for the AD7840ARS?
The AD7840ARS supports both parallel and serial data interfaces.
- What is the settling time of the AD7840ARS?
The settling time of the AD7840ARS is 4 µs.
- What is the signal-to-noise ratio (SNR) of the AD7840ARS?
The signal-to-noise ratio of the AD7840ARS is 80 dB.
- What is the typical power consumption of the AD7840ARS?
The typical power consumption of the AD7840ARS is 70 mW.
- What is the operating temperature range of the AD7840ARS?
The operating temperature range of the AD7840ARS is -25°C to 85°C.
- Can the AD7840ARS be used with high-speed DSP processors?
Yes, the AD7840ARS is designed to interface with high-speed DSP processors.
- What is the maximum serial data clock rate for the AD7840ARS?
The maximum serial data clock rate for the AD7840ARS is 6 MHz.
- Does the AD7840ARS have an on-chip reference?
Yes, the AD7840ARS includes a 3 V buried Zener reference.
