Overview
The AD9740ARU, produced by Analog Devices Inc., is a 10-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 and offers exceptional AC and DC performance. It supports update rates up to 210 MSPS, making it suitable for high-speed applications. The AD9740ARU is designed to be power-efficient, with low power dissipation that can be further reduced to 60 mW by lowering the full-scale current output, and a power-down mode that reduces standby power dissipation to approximately 15 mW.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Maximum Output Update Rate (fCLOCK) | - | - | 210 | MSPS |
| Output Settling Time (tST) (to 0.1%) | - | - | 11 | ns |
| Output Propagation Delay (tPD) | - | - | 1 | ns |
| Glitch Impulse | - | - | 5 | pV-s |
| Output Rise Time (10% to 90%) | - | - | 2.5 | ns |
| Output Fall Time (10% to 90%) | - | - | 2.5 | ns |
| Output Noise (IOUTFS = 20 mA) | - | - | 50 | pA/√Hz |
| Power Supply Range (AVDD, DVDD, CLKVDD) | 2.7 | - | 3.6 | V |
| Full-Scale Output Current Range | 2 | - | 20 | mA |
| Standby Power Dissipation (Power-Down Mode) | - | - | 15 | mW |
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.
- Digital inputs support 3 V CMOS logic families.
- Separate power supply inputs for analog and digital sections, operating independently over a 2.7 V to 3.6 V range.
- Power-down mode reduces standby power dissipation to approximately 15 mW.
- High output impedance (>100 kΩ).
- Pin-compatible with other members of the TxDAC family, allowing for easy component selection based on performance, resolution, and cost.
Applications
- Wideband communication transmit channels.
- Direct IF base stations.
- Wireless local loops.
- Digital radio links.
- Direct digital synthesis (DDS).
- Instrumentation.
Q & A
- What is the maximum output update rate of the AD9740ARU?
The maximum output update rate of the AD9740ARU is 210 MSPS.
- What is the output settling time of the AD9740ARU?
The output settling time (to 0.1%) of the AD9740ARU is 11 ns.
- What is the power dissipation of the AD9740ARU in power-down mode?
The power dissipation in power-down mode is approximately 15 mW.
- What is the range of the full-scale output current of the AD9740ARU?
The full-scale output current range is from 2 mA to 20 mA.
- What type of logic does the digital input of the AD9740ARU support?
The digital inputs support 3 V CMOS logic families.
- What is the output noise of the AD9740ARU when the full-scale output current is set to 20 mA?
The output noise is 50 pA/√Hz when the full-scale output current is set to 20 mA.
- Can the analog and digital sections of the AD9740ARU operate independently?
Yes, the analog and digital sections have separate power supply inputs that can operate independently over a 2.7 V to 3.6 V range.
- What is the typical output rise and fall time of the AD9740ARU?
The typical output rise and fall time is 2.5 ns each.
- What are some common applications of the AD9740ARU?
Common applications include wideband communication transmit channels, direct IF base stations, wireless local loops, digital radio links, and instrumentation.
- Is the AD9740ARU pin-compatible with other members of the TxDAC family?
Yes, the AD9740ARU is pin-compatible with other members of the TxDAC family, allowing for easy component selection based on performance, resolution, and cost.
