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AD664580/PCB 数据手册 - ADI（亚德诺）
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AD664580/PCB数据手册
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AD6645
14-Bit, 80/105 MSPS
A/D Converter
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.
REV. B
FEATURES
SNR = 75 dB, f
IN
15 MHz up to 105 MSPS
SNR = 72 dB, f
IN
200 MHz up to 105 MSPS
SFDR = 89 dBc, f
IN
70 MHz up to 105 MSPS
100 dB Multitone SFDR
IF Sampling to 200 MHz
Sampling Jitter 0.1 ps
1.5 W Power Dissipation
Differential Analog Inputs
Pin Compatible to AD6644
Twos Complement Digital Output Format
3.3 V CMOS Compatible
DataReady for Output Latching
APPLICATIONS
Multichannel, Multimode Receivers
Base Station Infrastructure
AMPS, IS-136, CDMA, GSM, WCDMA
Single Channel Digital Receivers
Antenna Array Processing
Communications Instrumentation
Radar, Infrared Imaging
Instrumentation
PRODUCT DESCRIPTION
The AD6645 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 the chip to
provide a complete conversion solution. The AD6645 provides
CMOS compatible digital outputs. It is the fourth generation in a
wideband ADC family, preceded by the AD9042 (12-bit, 41 MSPS),
the AD6640 (12-bit, 65 MSPS, IF sampling), and the AD6644
(14-bit, 40 MSPS/65 MSPS).
Designed for multichannel, multimode receivers, the AD6645
is part of Analog Devices’ SoftCell
®
transceiver chipset. The
AD6645 maintains 100 dB multitone, spurious-free dynamic
range (SFDR) through the second Nyquist band. This break-
through performance eases the burden placed on multimode
digital receivers (software radios) that are typically limited by the
ADC. Noise performance is exceptional; typical signal-to-noise
ratio is 74.5 dB through the first Nyquist band.
The AD6645 is built on Analog Devices’ high speed complemen-
tary bipolar process (XFCB) and uses an innovative, multipass
circuit architecture. Units are available in a thermally enhanced
52-lead PowerQuad 4
®
(LQFP_PQ4) specified from –40°C to
+85°C at 80 MSPS and –10°C to +85°C at 105 MSPS.
PRODUCT HIGHLIGHTS
1. IF Sampling
The AD6645 maintains outstanding ac performance up to
input frequencies of 200 MHz, suitable for multicarrier 3G
wideband cellular IF sampling receivers.
2. Pin Compatibility
The ADC has the same footprint and pin layout as the
AD6644, 14-Bit 40 MSPS/65 MSPS ADC.
3. SFDR Performance and Oversampling
Multitone SFDR performance of –100 dBc can reduce the
requirements of high end RF components and allows the
use of receive signal processors such as the AD6620 or
AD6624/AD6624A.
FUNCTIONAL BLOCK DIAGRAM
5
A1 TH2 A2 TH4 ADC3TH5TH3TH1
DAC1 ADC2 DAC2
ADC1
6
AIN
AIN
VREF
ENCODE
ENCODE
AV
CC
DV
CC
GND DMID OVR DRY D13
MSB
D12 D11 D10 D9D8D7D6D5D4D3D2D1D0
LSB
INTERNAL
TIMING
5
DIGITAL ERROR CORRECTION LOGIC
AD6645
2.4V
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