Overview
The AD9748ACPZRL7 is an 8-bit, high-performance digital-to-analog converter (DAC) from Analog Devices Inc. It is part of the TxDAC family, which is optimized for the transmit signal path of communication systems. This DAC offers exceptional AC and DC performance, supporting update rates up to 210 MSPS. The AD9748 is well-suited for portable and low-power applications due to its low power dissipation, which can be further reduced through adjustable full-scale current output and a power-down mode.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 8-bit |
| Update Rate | Up to 210 MSPS |
| Package Type | 32-Lead LFCSP (5mm x 5mm w/ EP) |
| Supply Voltage | 2.7 V to 3.6 V (single supply) |
| Power Dissipation | 135 mW (typical), 60 mW (reduced performance), 15 mW (power-down mode) |
| Full-Scale Current Output | Up to 20 mA, adjustable via external resistor |
| Input Logic | 3 V CMOS logic families |
| Clock Input | Differential or single-ended (LVPECL or CMOS) |
| Data Coding | Twos complement or straight binary |
| Voltage Reference | 1.2 V temperature-compensated band gap reference |
Key Features
- Segmented current source architecture combined with proprietary switching technique to enhance dynamic performance and reduce spurious components.
- Edge-triggered input latches and integrated 1.2 V temperature-compensated band gap reference for a complete monolithic DAC solution.
- Support for 3 V CMOS logic families.
- Differential or single-ended clock input (LVPECL or CMOS).
- Adjustable full-scale current output via an external resistor.
- Power-down mode for low power idle periods.
- High output impedance (>100 kΩ).
Applications
The AD9748 is specifically optimized for the transmit signal path of communication systems. It is well-suited for various applications including:
- Portable and low-power communication devices.
- Wireless communication systems.
- Baseband and IF signal processing.
- Direct digital synthesis (DDS) systems.
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 package type of the AD9748?
The AD9748 comes in a 32-Lead LFCSP (5mm x 5mm w/ EP) package.
- What is the supply voltage range for the AD9748?
The AD9748 operates on a single supply voltage from 2.7 V to 3.6 V.
- How can the power dissipation of the AD9748 be reduced?
The power dissipation can be reduced by lowering the full-scale current output or by using the power-down mode, which reduces standby power to approximately 15 mW.
- What type of input logic does the AD9748 support?
The AD9748 supports 3 V CMOS logic families.
- What types of clock inputs are supported by the AD9748?
The AD9748 supports differential or single-ended clock inputs (LVPECL or CMOS).
- What data coding formats are supported by the AD9748?
The AD9748 supports twos complement or straight binary data coding.
- Does the AD9748 have an integrated voltage reference?
Yes, the AD9748 includes a 1.2 V temperature-compensated band gap voltage reference.
- What is the typical full-scale current output of the AD9748?
The full-scale current output of the AD9748 is up to 20 mA and is adjustable via an external resistor.
