12-Bit, 170 MSPS/210 MSPS/250 MSPS,
1.8 V Analog-to-Digital Converter
AD9634
FUNCTIONAL BLOCK DIAGRAM
FEATURES
AVDD
AGND
DRVDD
SNR = 69.7 dBFS at 185 MHz AIN and 250 MSPS
SFDR = 87 dBc at 185 MHz AIN and 250 MSPS
−150.6 dBFS/Hz input noise at 185 MHz, −1 dBFS AIN and
250 MSPS
Total power consumption: 360 mW at 250 MSPS
1.8 V supply voltages
VIN+
PIPELINE
12-BIT
ADC
12
D0±/D1±
.
.
.
VIN–
VCM
PARALLEL
DDR LVDS
AND
AD9634
D10±/D11±
DRIVERS
LVDS (ANSI-644 levels) outputs
Integer 1-to-8 input clock divider (625 MHz maximum input)
Sample rates of up to 250 MSPS
IF sampling frequencies of up to 350 MHz
Internal ADC voltage reference
REFERENCE
DCO±
OR±
1-TO-8
CLOCK DIVIDER
SERIAL PORT
Flexible analog input range
SCLK SDIO
CSB
CLK+
CLK–
1.4 V p-p to 2.0 V p-p (1.75 V p-p nominal)
ADC clock duty cycle stabilizer
Figure 1.
Serial port control
Energy-saving power-down modes
User-configurable, built-in self test (BIST) capability
APPLICATIONS
Communications
Diversity radio systems
Multimode digital receivers (3G)
TD-SCDMA, WiMAX, W-CDMA, CDMA2000, GSM, EDGE, LTE
I/Q demodulation systems
Smart antenna systems
General-purpose software radios
Ultrasound equipment
Broadband data applications
GENERAL DESCRIPTION
The AD9634 is a 12-bit, analog-to-digital converter (ADC) with
sampling speeds of up to 250 MSPS. The AD9634 is designed to
support communications applications where low cost, small size,
wide bandwidth, and versatility are desired.
Programming for setup and control is accomplished using a
3-wire, SPI-compatible serial interface.
The AD9634 is available in a 32-lead LFCSP and is specified over
the industrial temperature range of −40°C to +85°C. This product
is protected by a U.S. patent.
The ADC core features a multistage, differential pipelined
architecture with integrated output error correction logic. The
ADC features wide bandwidth inputs that can support a variety
of user-selectable input ranges. An integrated voltage reference
eases design considerations. A duty cycle stabilizer (DCS) is
provided to compensate for variations in the ADC clock duty cycle,
allowing the converter to maintain excellent performance.
PRODUCT HIGHLIGHTS
1. Integrated 12-bit, 170 MSPS/210 MSPS/250 MSPS ADC.
2. Fast overrange and threshold detect.
3. Proprietary differential input maintains excellent SNR
performance for input frequencies of up to 350 MHz.
4. 3-pin, 1.8 V SPI port for register programming and readback.
5. Pin compatibility with the AD9642, allowing a simple
migration up to 14 bits, and with the AD6672.
The ADC output data are routed directly to the external 12-bit
LVDS output port.
Flexible power-down options allow significant power savings,
when desired.
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 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
©2011 Analog Devices, Inc. All rights reserved.
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