Overview
The AD9772A, specifically the AD9772AAST model from Analog Devices Inc., is a single-supply, oversampling, 14-bit digital-to-analog converter (DAC) designed for baseband or IF waveform reconstruction applications. It is optimized for applications requiring exceptional dynamic range and is manufactured on an advanced CMOS process. The device integrates a complete, low distortion 14-bit DAC with a 2× digital interpolation filter and clock multiplier, making it highly versatile for various signal processing tasks.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 14 bits | |||
| Maximum DAC Output Update Rate (fDAC) | 400 | MSPS | ||
| Input Data Rate | 160 | MSPS | ||
| Output Settling Time (tST) (to 0.025%) | 11 | ns | ||
| Bandwidth | 67.5 | MHz | ||
| AVDD Voltage Range | 3.1 | 3.3 | 3.5 | V |
| Analog Supply Current (IAVDD) | 34 | 37 | mA | |
| Digital Supply Current (IDVDD) | 37 | 40 | mA | |
| Operating Temperature Range | -40 | +85 | °C | |
| Package Type | 48-Lead LQFP (7mm x 7mm) | |||
Key Features
- Single-supply operation with a voltage range of 3.1V to 3.5V for AVDD, DVDD, and CLKVDD.
- Integrated 2× digital interpolation filter and clock multiplier, providing low-pass or high-pass response depending on the application.
- Flexible differential clock input for single-ended or differential clock drivers to optimize jitter performance.
- Segmented current source architecture combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance.
- Differential current outputs supporting differential or single-ended applications.
- On-chip band gap reference and control amplifier for maximum accuracy and flexibility.
- Full-scale current adjustable over a 2 mA to 20 mA range for additional gain-ranging capabilities.
- Zero-stuffing option to upsample data by a factor of 2 for direct IF applications.
Applications
The AD9772A is optimized for baseband or IF waveform reconstruction applications requiring exceptional dynamic range. It is particularly suitable for:
- Baseband applications, where the 2× digital interpolation filter provides a low-pass response, reducing the complexity of the analog reconstruction filter.
- Direct IF applications, where the filter can be reconfigured to select the upper in-band image, enhancing signal levels and pass-band flatness.
- Industrial automation and medical devices due to its high precision and reliability.
Q & A
- What is the resolution of the AD9772A DAC?
The AD9772A has a resolution of 14 bits.
- What is the maximum DAC output update rate of the AD9772A?
The maximum DAC output update rate is 400 MSPS.
- What is the input data rate of the AD9772A?
The input data rate is up to 160 MSPS.
- What is the bandwidth capability of the AD9772A?
The AD9772A can reconstruct full-scale waveforms with bandwidths of up to 67.5 MHz.
- What type of clock input does the AD9772A support?
The AD9772A supports a flexible differential clock input for single-ended or differential clock drivers.
- How does the AD9772A enhance dynamic performance?
The AD9772A uses a segmented current source architecture combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance.
- What is the operating temperature range of the AD9772A?
The operating temperature range is from -40°C to +85°C.
- What package type is the AD9772A available in?
The AD9772A is available in a 48-lead LQFP package.
- Can the full-scale current of the AD9772A be adjusted?
Yes, the full-scale current can be adjusted over a range of 2 mA to 20 mA.
- What is the purpose of the zero-stuffing option in the AD9772A?
The zero-stuffing option upsamples the data by a factor of 2 to increase the signal level of higher IF images and their pass-band flatness in direct IF applications.
