Overview
The AD9781BCPZ, produced by Analog Devices Inc., is a high-performance, dual digital-to-analog converter (DAC) designed for demanding applications requiring high dynamic range and precision. This device is part of the AD9780/AD9781/AD9783 family, which offers pin-compatible DACs with 12-, 14-, or 16-bit resolutions. The AD9781 specifically features 14-bit resolution and supports sample rates up to 500 MSPS. It is optimized for direct conversion transmit applications and integrates seamlessly with analog quadrature modulators like the ADL5370.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | - | 14 bits | - | - |
| Sample Rate | - | - | 500 MSPS | - |
| Analog Supply Voltage (AVDD33) | 3.13 V | 3.3 V | 3.47 V | V |
| Digital Supply Voltage (DVDD33) | 3.13 V | 3.3 V | 3.47 V | V |
| Digital Supply Voltage (DVDD18) | 1.7 V | 1.8 V | 1.9 V | V |
| Power Dissipation | - | - | 315 mW | mW |
| Operating Temperature | -40°C | - | 85°C | °C |
| Package Type | - | - | 72-Lead LFCSP | - |
Key Features
- High dynamic range, dual digital-to-analog converters with 14-bit resolution and sample rates up to 500 MSPS.
- LVDS inputs with dual-port or optional interleaved single-port operation.
- Differential analog current outputs programmable from 8.6 mA to 31.7 mA full scale.
- Auxiliary 10-bit current DACs with source/sink capability for external offset nulling.
- Internal 1.2 V precision reference voltage source.
- Full programmability through a serial peripheral interface (SPI) port.
- Pin-programmable features for applications without a controller.
- Proprietary dynamic output architecture for synthesizing analog outputs above Nyquist frequency.
- Seamless interface with analog quadrature modulators such as the ADL5370.
Applications
- Wireless infrastructure: W-CDMA, CDMA2000, TD-SCDMA, WiMAX.
- Wideband communications: LMDS/MMDS, point-to-point RF signal generators, arbitrary waveform generators.
- Direct conversion transmit applications.
Q & A
- What is the resolution of the AD9781BCPZ DAC?
The AD9781BCPZ has a 14-bit resolution.
- What is the maximum sample rate of the AD9781BCPZ?
The maximum sample rate is up to 500 MSPS.
- What type of interface does the AD9781BCPZ use for data input?
The AD9781BCPZ uses LVDS (Low-Voltage Differential Signaling) inputs.
- What is the power dissipation of the AD9781BCPZ?
The power dissipation is approximately 315 mW.
- What is the operating temperature range of the AD9781BCPZ?
The operating temperature range is from -40°C to 85°C.
- What package type is the AD9781BCPZ available in?
The AD9781BCPZ is available in a 72-Lead LFCSP (Lead Frame Chip Scale Package) package.
- Does the AD9781BCPZ support external offset nulling?
Yes, it supports external offset nulling through auxiliary 10-bit current DACs with source/sink capability.
- How is the AD9781BCPZ programmed?
The AD9781BCPZ is fully programmable through a serial peripheral interface (SPI) port and also offers some pin-programmable features.
- What is the purpose of the proprietary dynamic output architecture in the AD9781BCPZ?
The proprietary dynamic output architecture allows for the synthesis of analog outputs even above the Nyquist frequency by shifting energy away from the fundamental and into the image frequency.
- Can the AD9781BCPZ be used with analog quadrature modulators?
Yes, it interfaces seamlessly with analog quadrature modulators such as the ADL5370.
