Overview

Features and Benefits

  • JESD204B (Subclass 1) coded serial digital outputs
  • 1.65 W total power per channel at 1 GSPS (default settings)
  • SFDR at 1 GSPS = 85 dBFS at 340 MHz, 80 dBFS at 1 GHz
  • SNR at 1 GSPS = 65.3 dBFS at 340 MHz (AIN = −1.0 dBFS),
    • 60.5 dBFS at 1 GHz (AIN = −1.0 dBFS)
  • ENOB = 10.8 bits at 10 MHz
  • DNL = ±0.5 LSB
  • INL = ±2.5 LSB
  • Noise density = −154 dBFS/Hz at 1 GSPS
  • 1.25 V, 2.5 V, and 3.3 V dc supply operation
  • No missing codes
  • Internal ADC voltage reference
  • Flexible input range: 1.46 V p-p to 1.94 V p-p
    • AD9680-1250: 1.58 V p-p nominal
    • AD9680-1000 and AD9680-820: 1.70 V p-p nominal
    • AD9680-500: 1.46 V p-p to 2.06 V p-p (2.06 V p-p nominal)
  • Programmable termination impedance
    • 400 Ω, 200 Ω, 100 Ω, and 50 Ω differential
  • 2 GHz usable analog input full power bandwidth
  • 95 dB channel isolation/crosstalk
  • Amplitude detect bits for efficient AGC implementation
  • 2 integrated wideband digital processors per channel
    • 12-bit NCO, up to 4 half-band filters
  • Differential clock input
  • Integer clock divide by 1, 2, 4, or 8
  • Flexible JESD204B lane configurations
  • Small signal dither 

Product Details

The AD9680 is a dual, 14-bit, 1.25 GSPS/1 GSPS/820 MSPS/ 500 MSPS analog-to-digital converter (ADC). The device has an on-chip buffer and sample-and-hold circuit designed for low power, small size, and ease of use. This device is designed for sampling wide bandwidth analog signals of up to 2 GHz. The AD9680 is optimized for wide input bandwidth, high sampling rate, excellent linearity, and low power in a small package.

The dual ADC cores feature a multistage, differential pipelined architecture with integrated output error correction logic. Each ADC features wide bandwidth inputs supporting a variety of user-selectable input ranges. An integrated voltage reference eases design considerations.

The analog input and clock signals are differential inputs. Each ADC data output is internally connected to two digital downconverters (DDCs). Each DDC consists of up to five cascaded signal processing stages: a 12-bit frequency translator (NCO), and four half-band decimation filters. The DDCs are bypassed by default.

In addition to the DDC blocks, the AD9680 has several functions that simplify the automatic gain control (AGC) function in the communications receiver. The programmable threshold detector allows monitoring of the incoming signal power using the fast detect output bits of the ADC. If the input signal level exceeds the programmable threshold, the fast detect indicator goes high. Because this threshold indicator has low latency, the user can quickly turn down the system gain to avoid an overrange condition at the ADC input.

Users can configure the Subclass 1 JESD204B-based high speed serialized output in a variety of one-, two-, or four-lane configurations, depending on the DDC configuration and the acceptable lane rate of the receiving logic device. Multiple device synchronization is supported through the SYSREF± and SYNCINB± input pins.

The AD9680 has flexible power-down options that allow significant power savings when desired. All of these features can be programmed using a 1.8 V to 3.3 V capable, 3-wire SPI.

The AD9680 is available in a Pb-free, 64-lead LFCSP and is specified over the −40°C to +85°C industrial temperature range. This product is protected by a U.S. patent.

Product Highlights

  1. Wide full power bandwidth supports IF sampling of signals up to 2 GHz.
  2. Buffered inputs with programmable input termination eases filter design and implementation.
  3. Four integrated wideband decimation filters and numerically controlled oscillator (NCO) blocks supporting multiband receivers.
  4. Flexible serial port interface (SPI) controls various product features and functions to meet specific system requirements.
  5. Programmable fast overrange detection.
  6. 9 mm × 9 mm, 64-lead LFCSP.

Applications

  • Communications
  • Diversity multiband, multimode digital receivers 3G/4G, TD-SCDMA, W-CDMA, GSM, LTE
  • General-purpose software radios
  • Ultrawideband satellite receivers
  • Instrumentation
  • Radars
  • Signals intelligence (SIGINT)
  • DOCSIS 3.0 CMTS upstream receive paths
  • HFC digital reverse path receivers

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (4)

Software & Systems Requirements

Evaluation Software

JESD204 Interface Framework

Integrated JESD204 software framework for rapid system-level development and optimization

Tools & Simulations

Virtual Eval - BETA

Virtual Eval is a web application to assist designers in product evaluation of ADCs, DACs, and other ADI products. Using detailed models on Analog’s servers, Virtual Eval simulates crucial part performance characteristics within seconds. Configure operating conditions such as input tones and external jitter, as well as device features like gain or digital down-conversion. Performance characteristics include noise, distortion, and resolution, FFTs, timing diagrams, response plots, and more.

VirtualEval

Design Tools

ADIsimPE Linear and Mixed-Signal Circuit Simulator – Personal Edition

ADIsimPE, which is powered by SIMetrix/SIMPLIS, is a circuit simulation suite optimized for the design and development of analog and mixed signal circuits. SIMetrix mode is ideal for the simulation of general non-switching circuits. It provides full Pspice compatibility for use with industry-standard SPICE models. SIMPLIS (SIMulation Piecewise-Linear System) mode simulates the operation of switching circuits with vastly improved robustness, speed, and accuracy compared to standard SPICE. It is particularly useful for switching power supply, PLLs, and ADC/DAC applications.

Visual Analog

For designers who are selecting or evaluating high speed ADCs, VisualAnalog™ is a software package that combines a powerful set of simulation and data analysis tools with a user-friendly graphical interface.

Product Recommendations

AD9680 Companion Parts

Recommended Differential Driver Amplifiers

  • For a low output noise, RF differential amplifier for driving heavy loads: ADA4961.
  • For ultrahigh dynamic range, low distortion and low noise: ADL5565.

Recommended Power Products

  • For high performance, step-down switching regulators requiring high efficiency and design flexibility: ADP2164, ADP2384.
  • For a low dropout linear regulator,with adjustable output voltage settings: ADP1741.

Recommended Clocking Solutions

  • For high performance, low jitter and low phase noise, for its power and price, performance, or for added fanout: AD9528, HMC7044, HMC7043.

Recommended RF Amplifiers

Reference Materials

Informational (1)

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.