Overview
The AD9268BCPZRL7-80 is a dual, 16-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is designed to support high-performance communications applications, offering a balance of low cost, small size, and versatility. The AD9268 features a multistage, differential pipelined architecture with integrated output error correction logic. Each ADC includes wide bandwidth, differential sample-and-hold analog input amplifiers that support various user-selectable input ranges. An integrated voltage reference simplifies design considerations, and a duty cycle stabilizer ensures excellent performance by compensating for variations in the ADC clock duty cycle.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (AVDD) | 1.7 | 1.8 | 1.9 | V |
| Supply Voltage (DRVDD) | 1.7 | 1.8 | 1.9 | V |
| Supply Current (IAVDD1) | 234 | 240 | 293 | mA |
| Supply Current (IDRVDD1) - 1.8 V CMOS | 35 | 45 | 55 | mA |
| Supply Current (IDRVDD1) - 1.8 V LVDS | 89 | 89 | 94 | mA |
| Power Consumption - DC Input | 420 | 450 | 565 | mW |
| Power Consumption - Sine Wave Input (CMOS Output) | 485 | 608 | 800 | mW |
| Power Consumption - Sine Wave Input (LVDS Output) | 582 | 685 | mW | |
| Conversion Rate (DCS Enabled) | 20 | 80 | MSPS | |
| Clock Period - Divide-by-1 Mode (tCLK) | 12.5 | ns | ||
| Clock Pulse Width High (tCH) - Divide-by-1 Mode, DCS Enabled | 3.75 | ns |
Key Features
- SNR = 78.2 dBFS @ 70 MHz and 125 MSPS
- SFDR = 88 dBc @ 70 MHz and 125 MSPS
- Low power consumption: up to 750 mW @ 125 MSPS
- 1.8 V analog supply operation
- 1.8 V CMOS or LVDS output supply
- Integer 1-to-8 input clock divider
- IF sampling frequencies up to 300 MHz
- −153.6 dBm/Hz small-signal input noise with 200 Ω input impedance @ 70 MHz and 125 MSPS
- Optional on-chip dither for improved SFDR performance
- Programmable internal ADC voltage reference
- Flexible power-down options for significant power savings
- 3-wire SPI-compatible serial interface for setup and control
- Pin compatibility with AD9258, AD9251, AD9231, and AD9204 family of products
Applications
The AD9268 is designed to support high-performance communications applications, including:
- Wireless infrastructure
- Wireless local area networks (WLAN)
- Cable moderns and set-top boxes
- Radar and electronic warfare systems
- Medical imaging and diagnostics
- High-speed data acquisition systems
The device's versatility and performance make it suitable for a wide range of applications requiring high-speed, high-resolution analog-to-digital conversion.
Q & A
- What is the resolution and sample rate of the AD9268?
The AD9268 is a dual, 16-bit analog-to-digital converter with sample rates of 80 MSPS, 105 MSPS, and 125 MSPS.
- What are the supply voltage requirements for the AD9268?
The AD9268 operates from a 1.8 V analog supply (AVDD) and a separate 1.8 V digital output driver supply (DRVDD).
- What output formats are supported by the AD9268?
The AD9268 supports 1.8 V CMOS or LVDS output formats.
- How is the AD9268 programmed and controlled?
Programming for setup and control is accomplished using a 3-wire SPI-compatible serial interface.
- What is the package type and temperature range of the AD9268?
The AD9268 is available in a 64-lead LFCSP package and is specified over the industrial temperature range of −40°C to +85°C.
- What are some key performance metrics of the AD9268?
The AD9268 features an SNR of 78.2 dBFS and an SFDR of 88 dBc at 70 MHz and 125 MSPS. It also has low power consumption, with up to 750 mW at 125 MSPS.
- Does the AD9268 support any special features for improving performance?
Yes, the AD9268 includes an optional on-chip dither for improved SFDR performance and a duty cycle stabilizer to maintain excellent performance despite variations in the ADC clock duty cycle.
- What are the input impedance and noise specifications of the AD9268?
The AD9268 has a small-signal input noise of −153.6 dBm/Hz with 200 Ω input impedance at 70 MHz and 125 MSPS.
- Is the AD9268 compatible with other Analog Devices products?
Yes, the AD9268 is pin compatible with the AD9258, AD9251, AD9231, and AD9204 family of products, allowing for easy migration between different resolutions and sample rates.
- What tools are available for evaluating the AD9268?
An evaluation board (AD9268-125EBZ) and software tools such as VisualAnalog and SPI Controller are available to support the evaluation and configuration of the AD9268.
