Datasheet AD6644 (Analog Devices)

14-Bit, 40 MSPS/65 MSPS Analog-to-Digital Converter AD6644 FEATURES
Designed for multichannel, multimode receivers, the AD6644 is part of the Analog Devices, Inc. new SoftCell® transceiver
65 MSPS guaranteed sample rate 40 MSPS version available
chipset. The AD6644 achieves 100 dB multitone, spurious-free
Sampling jitter < 300 fs
dynamic range (SFDR) through the Nyquist band. This break-
100 dB multitone SFDR
through performance eases the burden placed on multimode
1.3 W power dissipation
digital receivers (software radios) which are typically limited by
Differential analog inputs
the ADC. Noise performance is exceptional; typical signal-to-
Pin compatible to AD6645
noise ratio is 74 dB.
Twos complement digital output format
The AD6644 is also useful in single channel digital receivers
3.3 V CMOS compatible
designed for use in wide-channel bandwidth systems (CDMA,
Data-ready for output latching
WCDMA). With oversampling, harmonics can be placed outside the analysis bandwidth. Oversampling also facilitates the use of decimation receivers (such as the AD6620), allowing
APPLICATIONS
the noise floor in the analysis bandwidth to be reduced. By
Multichannel, multimode receivers
replacing traditional analog filters with predictable digital
AMPS, IS-136, CDMA, GSM, WCDMA
components, modern receivers can be built using fewer RF
Single channel digital receivers
components, resulting in decreased manufacturing costs, higher
Antenna array processing
manufacturing yields, and improved reliability.
Communications instrumentation
The AD6644 is built on the Analog Devices high speed
Radar, infrared imaging
complementary bipolar process (XFCB) and uses an innovative,
Instrumentation
multipass circuit architecture. Units are packaged in a 52-lead plastic low profile quad flat package (LQFP) specified from – 25°C to +85°C.
GENERAL DESCRIPTION
The AD6644 is a high speed, high performance, monolithic 14-bit
PRODUCT HIGHLIGHTS
analog-to-digital converter (ADC). All necessary functions, 1. Guaranteed sample rate is 65 MSPS. including track-and-hold (TH) and reference, are included on- 2. Fully differential analog input stage. chip to provide a complete conversion solution. The AD6644 3. Digital outputs can be run on 3.3 V supply for easy interface provides CMOS-compatible digital outputs. It is the third to digital ASICs. generation in a wideband ADC family, preceded by the AD9042 4. Complete solution: reference and track-and-hold. (12-bit 41 MSPS) and the AD6640 (12-bit 65 MSPS, IF 5. Packaged in small, surface-mount, plastic, 52-lead LQFP. sampling).
FUNCTIONAL BLOCK DIAGRAM AV DV CC CC AIN A1 TH1 TH2 A2 TH3 TH4 TH5 ADC3 AIN 6 ADC1 DAC1 ADC2 DAC2 AD6644 VREF 2.4V 5 5 ENCODE INTERNAL DIGITAL ERROR CORRECTION LOGIC ENCODE TIMING
1
GND DMID OVR DRY D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
-00 71
(MSB) (LSB)
09 0 Figure 1.
Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS DC SPECIFICATIONS DIGITAL SPECIFICATIONS SWITCHING SPECIFICATIONS AC SPECIFICATIONS TIMING DIAGRAM ABSOLUTE MAXIMUM RATINGS EXPLANATION OF TEST LEVELS Test Level THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS EQUIVALENT CIRCUITS TERMINOLOGY THEORY OF OPERATION APPLYING THE AD6644 Encoding the AD6644 Analog Input Power Supplies Digital Outputs Layout Information Jitter Considerations EVALUATION BOARD OUTLINE DIMENSIONS ORDERING GUIDE