Overview
The AD9748ACP from Analog Devices Inc. is an 8-bit resolution, wideband, third-generation member of the TxDAC series of high-performance, low-power CMOS digital-to-analog converters (DACs). This device is specifically optimized for the transmit signal path of communication systems, offering exceptional AC and DC performance while supporting update rates up to 210 MSPS. The AD9748 is part of a pin-compatible family that includes 8-, 10-, 12-, and 14-bit DACs, allowing for flexible component selection based on performance, resolution, and cost.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 8 bits |
| Update Rate | Up to 210 MSPS |
| Power Supply | 2.7 V to 3.6 V (AVDD and DVDD) |
| Power Dissipation | 135 mW (typical), 60 mW (reduced performance), 15 mW (power-down mode) |
| Full-Scale Output Current | 2 mA to 20 mA (adjustable via external resistor) |
| Package | 32-Lead LFCSP (5mm x 5mm with EP) |
| Digital Input Logic | 3 V CMOS |
| Clock Input | Differential or single-ended (LVPECL or CMOS) |
| Data Coding | Twos complement or straight binary |
Key Features
- Segmented current source architecture combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance.
- Edge-triggered input latches and a 1.2 V temperature-compensated band gap reference for a complete monolithic DAC solution.
- Low power operation with the ability to reduce full-scale output current for lower power dissipation.
- Power-down mode to reduce standby power dissipation to approximately 15 mW.
- Support for differential or single-ended clock input (LVPECL or CMOS).
- Flexible output configurations including transformer coupled, resistor terminated, and single and differential outputs.
Applications
The AD9748 is optimized for the transmit signal path of communication systems, making it suitable for various high-speed and high-resolution applications such as:
- Wireless communication systems.
- Baseband and IF signal processing.
- Portable and low-power communication devices.
- High-speed data acquisition and signal generation.
Q & A
- What is the resolution of the AD9748?
The AD9748 has an 8-bit resolution.
- What is the maximum update rate of the AD9748?
The AD9748 supports update rates up to 210 MSPS.
- What is the power supply range for the AD9748?
The AD9748 operates from a 2.7 V to 3.6 V single supply (AVDD and DVDD).
- How can the power dissipation of the AD9748 be reduced?
The power dissipation can be reduced by lowering the full-scale output current or by using the power-down mode, which reduces standby power to approximately 15 mW.
- What types of clock inputs does the AD9748 support?
The AD9748 supports differential or single-ended clock inputs (LVPECL or CMOS).
- What data coding formats does the AD9748 support?
The AD9748 supports twos complement or straight binary data coding.
- What is the package type of the AD9748?
The AD9748 is available in a 32-Lead LFCSP (5mm x 5mm with EP) package.
- What is the purpose of the segmented current source architecture in the AD9748?
The segmented current source architecture, combined with a proprietary switching technique, reduces spurious components and enhances dynamic performance.
- Does the AD9748 have an integrated voltage reference?
Yes, the AD9748 includes a 1.2 V temperature-compensated band gap voltage reference.
- What are some typical applications of the AD9748?
The AD9748 is typically used in wireless communication systems, baseband and IF signal processing, portable and low-power communication devices, and high-speed data acquisition and signal generation.
