Overview
The AD9745 is a high-performance, dual 12-bit digital-to-analog converter (DAC) from Analog Devices Inc. It is designed for demanding applications, particularly in the transmit signal path of communication systems. The device features a high sample rate of up to 250 MSPS, making it suitable for a wide range of high-speed conversion needs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 12 | Bits | ||
| Sampling Rate | 250 | MSPS | ||
| Number of Channels | 2 | |||
| Integral Linearity Error (INL) | -2.5 | ±0.5 | +2.5 | LSB |
| Differential Nonlinearity (DNL) | -1.3 | ±0.4 | +1.3 | LSB |
| Full-Scale Output Current | 2 | 20 | mA | |
| Output Compliance Range | -1 | +1.25 | V | |
| Output Resistance | 100 | kΩ | ||
| Output Capacitance | 5 | pF | ||
| Minimum Operating Temperature | -40 | °C | ||
| Maximum Operating Temperature | +85 | °C | ||
| Package | 72-Lead LFCSP (10mm x 10mm w/ EP) |
Key Features
- High dynamic range and high sample rate of up to 250 MSPS.
- Proprietary dynamic output architecture to synthesize analog outputs above Nyquist by shifting energy away from the fundamental and into the image frequency.
- Gain and offset compensation for direct conversion transmit applications.
- Seamless interface with analog quadrature modulators such as the ADL5370.
- Serial peripheral interface (SPI) port for full programmability and pin-programmable features for applications without a controller.
- Segmented current source architecture combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance.
Applications
- Transmit signal path of communication systems.
- Direct conversion transmit applications.
- High-speed data acquisition and signal processing systems.
- Wireless communication systems, including base stations and handheld devices.
- Radar and military communication systems.
Q & A
- What is the resolution of the AD9745 DAC?
The AD9745 has a resolution of 12 bits. - What is the maximum sampling rate of the AD9745?
The maximum sampling rate is up to 250 MSPS. - How many channels does the AD9745 support?
The AD9745 supports dual channels. - What is the typical full-scale output current of the AD9745?
The typical full-scale output current is 20 mA. - What is the operating temperature range of the AD9745?
The operating temperature range is from -40°C to +85°C. - What type of interface does the AD9745 use?
The AD9745 uses a serial peripheral interface (SPI) port for full programmability. - Can the AD9745 be used in direct conversion transmit applications?
Yes, the AD9745 includes specific features for direct conversion transmit applications. - What is the package type of the AD9745?
The AD9745 comes in a 72-Lead LFCSP (10mm x 10mm w/ EP) package. - Does the AD9745 support pin-programmable features?
Yes, the AD9745 offers pin-programmable features for applications without a controller. - What is the power dissipation of the AD9745?
The power dissipation details can vary, but it is generally optimized for low power consumption.
