14-Bit, 40 MSPS/65 MSPS Analog-to-Digital Converter
The AD6644 is a high speed, high performance, monolithic 14-bit analog-to-digital converter (ADC). All necessary functions, including track-and-hold (TH) and reference are included on- chip to provide a complete conversion solution. The AD6644 provides CMOS-compatible digital outputs. It is the third generation in a wideband ADC family, preceded by the AD9042 (12-bit 41 MSPS) and the AD6640 (12-bit 65 MSPS, IF sampling).
Designed for multichannel, multimode receivers, the AD6644 is part of the Analog Devices, Inc. new SoftCell® transceiver chipset. The AD6644 achieves 100 dB multitone, spurious-free dynamic range (SFDR) through the Nyquist band. This break- through performance eases the burden placed on multimode digital receivers (software radios) which are typically limited by the ADC. Noise performance is exceptional; typical signal-to- noise ratio is 74 dB.
The AD6644 is also useful in single channel digital receivers designed for use in wide-channel bandwidth systems (CDMA, WCDMA). With oversampling, harmonics can be placed outside the analysis bandwidth. Oversampling also facilitates the use of decimation receivers (such as the AD6620), allowing the noise floor in the analysis bandwidth to be reduced. By replacing traditional analog filters with predictable digital components, modern receivers can be built using fewer RF components, resulting in decreased manufacturing costs, higher manufacturing yields, and improved reliability.
The AD6644 is built on the Analog Devices high speed complementary bipolar process (XFCB) and uses an innovative, multipass circuit architecture. Units are packaged in a 52-lead plastic low profile quad flat package (LQFP) specified from – 25°C to +85°C.
- Guaranteed sample rate is 65 MSPS.
- Fully differential analog input stage.
- Digital outputs can be run on 3.3 V supply for easy interface to digital ASICs.
- Complete solution: reference and track-and-hold.
- Packaged in small, surface-mount, plastic, 52-lead LQFP.
- Multichannel, multimode receivers
- AMPS, IS-136, CDMA, GSM, WCDMA
- Single channel digital receivers
- Antenna array processing
- Communications instrumentation
- Radar, infrared imaging
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.
MS-2210: Designing Power Supplies for High Speed ADC
Buffer Adapts Single-ended Signals for Differential Inputs
by Randall Carver, Analog Devices (EDN Design Idea, 9/2/2004)
Correlating High-Speed ADC Performance to Multicarrier 3G Requirements
by Brad Brannon (Mobile Dev Design, 6/1/2003)
DNL and Some of its Effects on Converter Performance
... by Brad Brannon, Analog Devices, Inc. (Wireless Design & Development, June 2001)
Soft Radio Runs into Hard Standards
by Brad Brannon and Chris Cloninger, Analog Devices Inc.
(EE Times, April 11, 2001)
Redefining the Role of ADCs in Wireless
by Brad Brannon and Chris Cloninger Analog Devices, Inc.
... An update on the performance required for modern...
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.
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.