14-Bit, 40 MSPS/65 MSPS
Analog-to-Digital Converter
AD6644
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.
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
Pin compatible to AD6645
Twos complement digital output format
3.3 V CMOS compatible
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.
Data-ready for output latching
APPLICATIONS
Multichannel, multimode receivers
AMPS, IS-136, CDMA, GSM, WCDMA
Single channel digital receivers
Antenna array processing
Communications instrumentation
Radar, infrared imaging
Instrumentation
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.
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
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).
1. Guaranteed sample rate is 65 MSPS.
2. Fully differential analog input stage.
3. Digital outputs can 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-lead LQFP.
FUNCTIONAL BLOCK DIAGRAM
AV
DV
CC
CC
AIN
AIN
A1
TH1
TH2
A2
TH3
TH4
TH5
ADC3
6
ADC1
DAC1
ADC2
DAC2
AD6644
V
2.4V
REF
5
5
ENCODE
ENCODE
INTERNAL
TIMING
DIGITAL ERROR CORRECTION LOGIC
GND
DMID OVR DRY D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1
(MSB)
D0
(LSB)
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
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2007 Analog Devices, Inc. All rights reserved.
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