-
AD6642: Dual IF Receiver Data Sheet (Rev. A)11/18/2010PDF1147 kB
Overview
Features and Benefits
- 11-bit, 200 MSPS output data rate per channel
- Integrated noise shaping requantizer (NSR)
- Performance with NSR enabled
SNR: 75.5 dBFS in 40 MHz band to 70 MHz @ 185 MSPS
SNR: 73.7 dBFS in 60 MHz band to 70 MHz @ 185 MSPS - Performance with NSR disabled
SNR: 66.5 dBFS to 70 MHz @ 185 MSPS
SFDR: 83 dBc to 70 MHz @ 185 MSPS
- Low power: 0.62 W @ 185 MSPS
- 1.8 V analog supply operation
- 1.8 V LVDS (ANSI-644 levels) output
- 1-to-8 integer clock divider
- Internal ADC voltage reference
- 1.75 V p-p analog input range
(programmable to 2.0 Vp-p) - Differential analog inputs with 800 MHz bandwidth
- See data sheet for additional features
Product Details
The AD6642 is an 11-bit, 200 MSPS, dual-channel intermediate frequency (IF) receiver specifically designed to support multi-antenna systems in telecommunication applications where high dynamic range performance, low power, and small size are desired.
The device consists of two high performance analog-to-digital converters (ADCs) and noise shaping requantizer (NSR) digital blocks. Each ADC consists of a multistage, differential pipelined architecture with integrated output error correction logic. The ADC features a wide bandwidth switched-capacitor sampling network within the first stage of the differential pipeline. An integrated voltage reference eases design considerations. A duty cycle stabilizer (DCS) compensates for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance.
Each ADC output is connected internally to an NSR block. The integrated NSR circuitry allows for improved SNR performance in a smaller frequency band within the Nyquist bandwidth. The device supports two different output modes selectable via the external MODE pin or the SPI.
With the NSR feature enabled, the outputs of the ADCs are processed such that the AD6642 supports enhanced SNR performance within a limited portion of the Nyquist bandwidth while maintaining an 11-bit output resolution. The NSR block can be programmed to provide a bandwidth of either 22% or 33% of the sample clock. For example, with a sample clock rate of 185 MSPS, the AD6642 can achieve up to 75.5 dBFS SNR for a 40 MHz bandwidth in the 22% mode and up to 73.7 dBFS SNR for a 60 MHz bandwidth in the 33% mode.
With the NSR block disabled, the ADC data is provided directly to the output with a resolution of 11 bits. The AD6642 can achieve up to 66.5 dBFS SNR for the entire Nyquist bandwidth when operated in this mode. This allows the AD6642 to be used in telecommunication applications such as a digital predistortion observation path where wider bandwidths are desired.
After digital signal processing, multiplexed output data is routed into two 11-bit output ports such that the maximum data rate is 400 Mbps (DDR). These outputs are set at 1.8 V LVDS and support ANSI-644 levels.
The AD6642 receiver digitizes a wide spectrum of IF frequencies. Each receiver is designed for simultaneous reception of a separate antenna. This IF sampling architecture greatly reduces component cost and complexity compared with traditional analog techniques or less integrated digital methods.
Flexible power-down options allow significant power savings. Programming for device setup and control is accomplished using a 3-wire SPI-compatible serial interface with numerous modes to support board-level system testing.
The AD6642 is available in a Pb-free/RoHS compliant, 144-ball, 10 mm × 10 mm chip scale package ball grid array (CSP_BGA) and is specified over the industrial temperature range of −40°C to +85°C.
APPLICATIONS
- Communications
- Diversity radio and smart antenna (MIMO) systems
- Multimode digital receivers (3G)
- WCDMA, LTE, CDMA2000
- WiMAX, TD-SCDMA
- I/Q demodulation systems
- General-purpose software radios
PRODUCT HIGHLIGHTS
- Two ADCs are contained in a small, space-saving, 10 mm × 10 mm × 1.4 mm, 144-ball CSP_BGA package.
- Pin selectable noise shaping requantizer (NSR) function that allows for improved SNR within a reduced bandwidth of up to 60 MHz at 185 MSPS.
- LVDS digital output interface configured for low cost FPGA families.
- 120 mW per ADC core power consumption.
- Operation from a single 1.8 V supply.
- Standard serial port interface (SPI) that supports various product features and functions, such as data formatting (offset binary or twos complement), NSR, power-down, test modes, and voltage reference mode.
- On-chip integer 1-to-8 input clock divider and multichip sync function to support a wide range of clocking schemes and multichannel subsystems.
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
-
AN-905: VisualAnalog™ Converter Evaluation Tool Version 1.0 User Manual8/18/2020
-
AN-878: High Speed ADC SPI Control Software (Rev. A)3/20/2018PDF585 kB
-
AN-835: Understanding High Speed ADC Testing and Evaluation (Rev. B)5/12/2015PDF985 kB
-
AN-501: Aperture Uncertainty and ADC System Performance (Rev. A)2/14/2015PDF227 K
-
AN-282: Fundamentals of Sampled Data Systems2/14/2015PDF2131 kB
-
AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter (Rev. 0)2/14/2015PDF291K
-
AN-827: A Resonant Approach to Interfacing Amplifiers to Switched-Capacitor ADCs (Rev. 0)2/14/2015PDF203 kB
-
AN-935: Designing an ADC Transformer-Coupled Front End (Rev. 0)2/14/2015PDF363 kB
-
AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. C)2/14/2015PDF427 K
-
AN-345: Grounding for Low-and-High-Frequency Circuits2/14/2015PDF455 kB
-
AN-586: LVDS Outputs for High Speed A/D Converters (Rev. 0)2/14/2015PDF207 kB
-
AN-1142: Techniques for High Speed ADC PCB Layout (Rev. 0)2/2/2012PDF392 kB
-
AN-737: How ADIsimADC Models an ADC (Rev. B)11/9/2007PDF373 kB
-
AN-807: Multicarrier WCDMA Feasibility (Rev. 0)11/9/2007PDF969 kB
-
AN-808: Multicarrier CDMA2000 Feasibility (Rev. 0)11/9/2007PDF1535 kB
-
AN-851: A WiMax Double Downconversion IF Sampling Receiver Design (Rev. 0)7/26/2006PDF262 kB
-
AN-741: Little Known Characteristics of Phase Noise (Rev. 0)11/29/2004PDF1679 kB
-
UG-232: Evaluating the AD6642/AD6657 Analog-to-Digital Converters12/9/2010PDF2466 kB
-
Differential Interfaces Improve Performance in RF Transceiver Designs7/1/2011 Analog Dialogue
Tools & Simulations
Design Tools
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.
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.View our quality and reliability program and certifications for more information.
Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
---|---|---|---|---|
AD6642BBCZ | Material Declaration | Reliability Data | 144-Ball CSPBGA (10mm x 10mm x 1.4mm) | |
Wafer Fabrication Data |
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.