AD6644AST40 Analog Devices, AD6644AST40 Datasheet

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AD6644AST40

Manufacturer Part Number
AD6644AST40
Description
TQFP52
Manufacturer
Analog Devices
Datasheet

Specifications of AD6644AST40

Date_code
05+
a
REV. C
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
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 on-
chip to provide a complete conversion solution. The AD6644
provides CMOS compatible digital outputs. It is the third genera-
tion in a wideband ADC family, preceded by the AD9042 (12-bit
41 MSPS) and the AD6640 (12-bit 65 MSPS, IF sampling).
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
APPLICATIONS
Multichannel, Multimode Receivers
AMPS, IS-136, CDMA, GSM, Third Generation
Single Channel Digital Receivers
Antenna Array Processing
Communications Instrumentation
Radar, Infrared Imaging
Instrumentation
Twos Complement Format
3.3 V CMOS Compatible
Data Ready for Output Latching
ENCODE
ENCODE
V
AIN
AIN
REF
2.4V
INTERNAL
AV
A1
TIMING
GND
CC
TH1
DV
CC
DMID
ADC1
OVR
DRY
FUNCTIONAL BLOCK DIAGRAM
TH2
5
D13
DAC1
MSB
D12
D11
DIGITAL ERROR CORRECTION LOGIC
A2
D10
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 de-
signed 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 tradi-
tional analog filters with predictable digital components, modern
receivers can be built using fewer RF components, resulting in de-
creased manufacturing costs, higher manufacturing yields, and
improved reliability.
The AD6644 is built on Analog Devices’ high speed complemen-
tary bipolar process (XFCB) and uses an innovative, multipass
circuit architecture. Units are packaged in a 52-lead Plastic Low
Profile Quad Flat Pack (LQFP) specified from –25°C to +85°C.
PRODUCT HIGHLIGHTS
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
4. Complete solution: reference and track-and-hold.
5. Packaged in small, surface-mount, plastic, 52-lead LQFP.
TH3
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
D9
to digital ASICs.
D8
ADC2
D7
14-Bit, 40 MSPS/65 MSPS
D6
TH4
5
D5
© 2003 Analog Devices, Inc. All rights reserved.
DAC2
D4
D3
TH5
D2
AD6644
A/D Converter
D1
ADC3
D0
LSB
AD6644
6
www.analog.com

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