參數(shù)資料
型號: AD6644AST-65
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 14-Bit, 40 MSPS/65 MSPS A/D Converter
中文描述: 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP52
封裝: LOW PROFILE, PLASTIC, MS-026BCC, QFP-52
文件頁數(shù): 1/19頁
文件大?。?/td> 1155K
代理商: AD6644AST-65
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.
a
AD6644
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
14-Bit, 40 MSPS/65 MSPS
A/D Converter
FUNCTIONAL BLOCK DIAGRAM
5
ADC2
DAC2
TH4
TH3
TH5
ADC3
6
A2
5
ADC1
DAC1
TH2
TH1
A1
DIGITAL
ERROR
CORRECTION
LOGIC
2.4V
INTERNAL
TIMING
AV
CC
DV
CC
AIN
AIN
V
REF
ENCODE
ENCODE
GND
D8
D9
D10
D11
D12
D13
DRY
OVR
DMID
D0
D1
D2
D3
D4
D5
D6
D7
MSB
LSB
AD6644
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
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.)
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 out-
side 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 decreased 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-terminal Low-
Profile Quad Plastic Flatpack (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
to digital ASICs.
4. Complete Solution: reference and track-and-hold.
5. Packaged in small, surface-mount, plastic, 52-terminal LQFP.
SoftCell is a trademark of Analog Devices, Inc.
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