Overview
The AD9778BSVZ, produced by Analog Devices Inc., is a dual, 14-bit, high dynamic range digital-to-analog converter (DAC) designed for high-performance applications. It operates at a sample rate of 1 GSPS, enabling multicarrier generation up to the Nyquist frequency. This DAC is optimized for direct conversion transmit applications, including complex digital modulation and gain and offset compensation. The device is manufactured on an advanced 0.18 μm CMOS process and operates from 1.8 V and 3.3 V supplies, making it suitable for a wide range of wireless and communication systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 14 | 14 | 14 | Bits |
| Differential Nonlinearity (DNL) | ±0.65 | ±0.65 | ±2.1 | LSB |
| Integral Nonlinearity (INL) | ±1 | ±1 | ±3.7 | LSB |
| Main DAC Output Offset Error | -0.001 | 0 | +0.001 | % FSR |
| Main DAC Output Gain Error (with Internal Reference) | ±2 | ±2 | ±2 | % FSR |
| Full-Scale Output Current | 8.66 | 20.2 | 31.66 | mA |
| Output Compliance Range | -1.0 | 0 | +1.0 | V |
| Output Resistance | 10 | 10 | 10 | MΩ |
| Analog Supply Voltages (AVDD33) | 3.13 | 3.3 | 3.47 | V |
| Digital Supply Voltages (DVDD33) | 3.13 | 3.3 | 3.47 | V |
| Power Consumption (1× Mode, fDAC = 100 MSPS) | 250 | 300 | 300 | mW |
Key Features
- High dynamic range with 14-bit resolution and sample rates up to 1 GSPS.
- Novel 2×, 4×, and 8× interpolator/coarse complex modulator for flexible carrier placement.
- Auxiliary DACs for control of external VGA and offset.
- Multiple chip synchronization interface for synchronized operation.
- High-performance, low-noise PLL clock multiplier.
- Digital inverse sinc filter.
- 100-lead, exposed paddle TQFP package.
- Programmable full-scale output current (10 mA to 30 mA).
- Serial peripheral interface (SPI) for programming and readback of internal parameters.
Applications
- Wireless infrastructure: WCDMA, CDMA2000, TD-SCDMA, WiMax, GSM.
- Digital high or low IF synthesis.
- Internal digital upconversion capability.
- Transmit diversity.
- Wideband communications: LMDS/MMDS, point-to-point wireless.
- Multicarrier systems.
Q & A
- What is the resolution of the AD9778BSVZ DAC?
The AD9778BSVZ has a resolution of 14 bits.
- What is the maximum sample rate of the AD9778BSVZ?
The maximum sample rate is 1 GSPS.
- What are the typical operating supply voltages for the AD9778BSVZ?
The typical operating supply voltages are 3.3 V for AVDD33 and DVDD33, and 1.8 V for DVDD18 and CVDD18.
- What is the range of the full-scale output current for the AD9778BSVZ?
The full-scale output current can be programmed over a range of 10 mA to 30 mA.
- What types of modulation does the AD9778BSVZ support?
The AD9778BSVZ supports complex digital modulation and includes features for gain and offset compensation.
- What is the package type of the AD9778BSVZ?
The AD9778BSVZ is packaged in a 100-lead, exposed paddle TQFP package.
- What are some of the key applications for the AD9778BSVZ?
Key applications include wireless infrastructure, digital high or low IF synthesis, internal digital upconversion, transmit diversity, and wideband communications.
- How does the AD9778BSVZ handle multiple chip synchronization?
The AD9778BSVZ includes a multiple chip synchronization interface for synchronized operation.
- What interface is used for programming and readback of internal parameters?
A serial peripheral interface (SPI) is used for programming and readback of internal parameters.
- What is the power consumption of the AD9778BSVZ in 1× mode at 100 MSPS?
The power consumption in 1× mode at 100 MSPS is typically 300 mW.
