Maker : Analog Devices
Part No. : AD6644PCB

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Product Information

a FEATURES 65 MSPS Guaranteed Sample Rate 40 MSPS Version Available Sampling Jitter < 300 fs 100 dB Multitone SFDR 1.3 W Power Dissipation Differential Analog Inputs Digital Outputs Two’s Complement Format 3.3 V CMOS-Compatible Data Ready for Output Latching APPLICATIONS Multichannel, Multimode Receivers AMPS, IS-136, CDMA, GSM, Third Generation Single Channel Digital Receivers Antenna Array Processing Communications Instrumentation Radar, Infrared Imaging Instrumentation 14-Bit, 40 MSPS/65 MSPS A/D Converter AD6644 Designed for multichannel, multimode receivers, the AD6644 is part of ADI’s new SoftCell™ transceiver chipset. The AD6644 achieves 100 dB multitone, spurious-free dynamic range (SFDR) through the Nyquist band. This breakthrough 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, W-CDMA). 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 Analog Devices’ high-speed complementary bipolar process (XFCB) and uses an innovative, multipass circuit architecture. Units are packaged in a 52-terminal LowProfile Quad Plastic Flatpack (LQFP) specified from –25°C to +85°C. PRODUCT HIGHLIGHTS PRODUCT DESCRIPTION The AD6644 is a high-speed, high-performance, monolithic 14-bit analog-to-digital converter. All necessary functions, including track-and-hold (T/H) and reference, are included onchip 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.) 1. Guaranteed sample rate is 65 MSPS. 2. Fully differential analog input stage. 3. Digital outputs may be run on 3.3 V supply for easy interface to digital ASICs. 4. Complete Solution: reference and track-and-hold. 5. Packaged in small, surface-mount, plastic, 52-terminal LQFP. FUNCTIONAL BLOCK DIAGRAM AVCC DVCC AIN A1 AIN TH1 TH2 A2 TH3 TH4 TH5 ADC3 VREF 2.4V ADC1 5 DAC1 ADC2 5 DAC2 6 AD6644 ENCODE ENCODE INTERNAL TIMING MSB GND DMID OVR DRY D13 D12 DIGITAL ERROR CORRECTION LOGIC LSB D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SoftCell is a trademark of Analog Devices, Inc. REV. 0 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 rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 AD6644–SPECIFICATIONS DC SPECIFICATIONS (AV Parameter RESOLUTION ACCURACY No Missing Codes Offset Error Gain Error Differential Nonlinearity (DNL) Integral Nonlinearity (INL) TEMPERATURE DRIFT Offset Error Gain Error POWER SUPPLY REJECTION (PSRR) REFERENCE OUT (VREF) ANALOG INPUTS (AIN, AIN) Differential Input Voltage Range Differential Input Resistance Differential Input Capacitance POWER SUPPLY Supply Voltage AVCC1 DVCC Supply Current IAVCC (AVCC = 5.0 V) IDVCC (DVCC = 3.3 V) POWER CONSUMPTION Full Full Full Full Full Full Full Full Full Full Full 25°C II II II II V V V V V V V V CC = 5 V, DVC...

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