Overview
The AD9777BSVZ is a high-performance, 16-bit digital-to-analog converter (DAC) produced by Analog Devices Inc. This device is part of the TxDAC+® family and is designed for high-speed applications, particularly in digital communication systems. It features advanced interpolation capabilities, allowing for 2×, 4×, or 8× interpolation, and supports complex modulation schemes. The AD9777BSVZ is ideal for systems requiring high dynamic range, multicarrier, and multistandard capabilities, such as wideband CDMA, multicarrier CDMA, TDMA, GSM, and high-order QAM modulation schemes.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 16-bit | |
| Maximum Input Data Rate | 160 MSPS (no interpolation) | |
| Maximum DAC Update Rate | 400 MSPS (8x interpolation) | |
| Supply Voltage Range | 3.1 V to 3.5 V | V |
| Power Consumption | 1.2 W (typical) | W |
| Operating Temperature Range | -40°C to +85°C | °C |
| Package Type | 80-Lead TQFP (12mm x 12mm) | |
| Digital Supply Current (IDVDD) | 34 mA to 41 mA | mA |
| Clock Supply Current (ICLKVDD) | 23.5 mA | mA |
| Power Supply Rejection Ratio | ±0.4 % of FSR/V |
Key Features
- Selectable interpolation rates of 2×, 4×, or 8×, allowing for flexible data rate handling.
- Complex modulation capabilities, supporting fS/2, fS/4, and fS/8 digital modulation and image rejection when combined with an analog quadrature modulator.
- Dual high-performance DAC outputs with differential current output programmable over a 2 mA to 20 mA range.
- Flexible clock interface accepting differential or single-ended sine wave or digital logic inputs, with an internal PLL clock multiplier and programmable divider.
- Support for straight binary or two's complement data formats and single-port interleaved or dual-port data input.
- User-accessible gain and offset correction through an SPI interface to improve sideband suppression and LO feedthrough.
- Direct IF mode for synthesizing intermediate frequencies (IFs) above 70 MHz.
- Low power consumption design with a power-down mode to reduce power when not in use.
Applications
- Communications systems, including 3G, multicarrier GSM, TDMA, CDMA, and broadband wireless.
- Analog quadrature modulation architecture.
- Broadband wireless and point-to-point microwave radios.
- Instrumentation and automated test equipment (ATE).
- Test and measurement equipment.
- Medical imaging devices and other high-speed data conversion applications.
Q & A
- What is the resolution of the AD9777BSVZ DAC?
The AD9777BSVZ has a resolution of 16 bits.
- What are the maximum input data rate and DAC update rate of the AD9777BSVZ?
The maximum input data rate is 160 MSPS (no interpolation), and the maximum DAC update rate is 400 MSPS (8x interpolation).
- What is the supply voltage range for the AD9777BSVZ?
The supply voltage range is from 3.1 V to 3.5 V.
- How much power does the AD9777BSVZ typically consume?
The AD9777BSVZ typically consumes 1.2 W of power.
- What is the operating temperature range of the AD9777BSVZ?
The operating temperature range is from -40°C to +85°C.
- What type of package does the AD9777BSVZ come in?
The AD9777BSVZ comes in an 80-Lead TQFP (12mm x 12mm) package.
- What are the key features of the AD9777BSVZ's clock interface?
The clock interface accepts differential or single-ended sine wave or digital logic inputs, includes an internal PLL clock multiplier, and has a programmable divider.
- What modulation capabilities does the AD9777BSVZ support?
The AD9777BSVZ supports fS/2, fS/4, and fS/8 digital modulation and image rejection when combined with an analog quadrature modulator.
- What are some common applications of the AD9777BSVZ?
Common applications include communications systems, broadband wireless, point-to-point microwave radios, instrumentation, and test and measurement equipment.
- How does the AD9777BSVZ improve signal quality in communication systems?
The AD9777BSVZ improves signal quality by providing excellent linearity, low noise, and low distortion outputs, and by supporting complex modulation schemes that reduce the need for additional filtering stages.
