Overview
The AD9786BSVZ from Analog Devices Inc. is a high-performance, 16-bit digital-to-analog converter (DAC) designed specifically for multicarrier communications architectures. It is part of the TxDAC+® product family and is renowned for its exceptional linearity, noise performance, and intermodulation distortion characteristics. This DAC operates with a 16-bit resolution and supports input data rates up to 200 MSPS, making it ideal for synthesizing multicarrier transmit signals at intermediate frequencies (IFs) of 100 to 300 MHz and beyond. This capability allows system designers to eliminate the need for an up-conversion stage, thereby reducing the overall parts count and total system cost.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 16 bits | |||
| Input Data Rate | 200 MSPS | |||
| Analog Supply Voltage (AVDD) | 3.1 | 3.3 | 3.5 | V |
| Digital Supply Voltage (DRVDD) | 2.5 V | |||
| Digital Supply Voltage (DVDD) | 2.5 V | |||
| Full-Scale Current (IOUTFS) | 10 | 20 | mA | |
| Intermodulation Distortion (IMD) | 90 dBc @ 10 MHz | |||
| Noise Spectral Density (NSD) | -164 dBm/Hz @ 10 MHz | |||
| WCDMA ACLR | 80 dBc @ 40 MHz | |||
| Differential Nonlinearity (DNL) | ±0.3 LSB | |||
| Integral Nonlinearity (INL) | ±0.6 LSB | |||
Key Features
- Selectable Interpolation Filters: 2×, 4×, and 8× interpolation filters to simplify interfacing with various input data rates and to leverage oversampling performance gains.
- Modulation Modes: Allows convenient bandwidth placement and selectable sideband suppression.
- Flexible Clock Interface: Accepts a variety of input types such as 1 V p-p sine wave, CMOS, and LVPECL in single-ended or differential mode.
- Differential Current Output: Supports single-ended or differential applications with a nominal full-scale current from 10 mA to 20 mA.
- On-Chip Voltage Reference: Includes a 1.20 V temperature-compensated band gap voltage reference.
- Multichip Synchronization: Multiple AD9786 DACs can be synchronized to a single master AD9786 for optimized timing and image reject transmit performance.
- Low Power Operation: The DAC full-scale current can be reduced, and a sleep mode is provided for low power idle periods.
Applications
The AD9786BSVZ is specifically designed for multicarrier communications architectures, making it highly suitable for:
- Third-Generation Base Stations: Meets the demanding performance requirements for these systems.
- Intermediate Frequency (IF) Signal Synthesis: Capable of synthesizing multicarrier transmit signals at IFs of 100 to 300 MHz and beyond.
- Wireless Communication Systems: Ideal for systems requiring high linearity, low noise, and minimal intermodulation distortion.
Q & A
- What is the resolution of the AD9786BSVZ DAC?
The AD9786BSVZ has a 16-bit resolution.
- What is the maximum input data rate of the AD9786BSVZ?
The maximum input data rate is 200 MSPS.
- What are the supply voltage ranges for the AD9786BSVZ?
The analog supply voltage (AVDD) ranges from 3.1 V to 3.5 V, and the digital supply voltage (DRVDD and DVDD) is 2.5 V.
- What is the full-scale current range of the AD9786BSVZ?
The full-scale current ranges from 10 mA to 20 mA.
- Does the AD9786BSVZ support multichip synchronization?
Yes, multiple AD9786 DACs can be synchronized to a single master AD9786.
- What types of clock inputs does the AD9786BSVZ support?
The AD9786BSVZ supports clock inputs such as 1 V p-p sine wave, CMOS, and LVPECL in single-ended or differential mode.
- What is the noise spectral density (NSD) of the AD9786BSVZ?
The noise spectral density is -164 dBm/Hz at 10 MHz.
- What is the WCDMA ACLR performance of the AD9786BSVZ?
The WCDMA ACLR is 80 dBc at 40 MHz.
- Does the AD9786BSVZ have an on-chip voltage reference?
Yes, it includes a 1.20 V temperature-compensated band gap voltage reference.
- What is the package type of the AD9786BSVZ?
The AD9786BSVZ is available in an 80-lead TQFP (12mm x 12mm) package.
