12-Bit, 170 MSPS/210 MSPS/250 MSPS,
1.8 V Analog-to-Digital Converter
AD9626
FEATURES
APPLICATIONS
SNR = 64.8 dBFS @ fIN up to 70 MHz @ 250 MSPS
Wireless and wired broadband communications
ENOB of 10.5 @ fIN up to 70 MHz @ 250 MSPS (−1.0 dBFS)
SFDR = 80 dBc @ fIN up to 70 MHz @ 250 MSPS (−1.0 dBFS)
Excellent linearity
Cable reverse path
Communications test equipment
Radar and satellite subsystems
Power amplifier linearization
DNL = 0.3 LSB typical
INL = 0.7 LSB typical
CMOS outputs
FUNCTIONAL BLOCK DIAGRAM
RBIAS
PWDN
AGND
AVDD (1.8V)
Single data port at up to 250 MHz
Interleaved dual port @ ½ sample rate up to 125 MHz
700 MHz full power analog bandwidth
On-chip reference, no external decoupling required
Integrated input buffer and track-and-hold
Low power dissipation
REFERENCE
AD9626
CML
DRVDD
DRGND
VIN+
VIN–
TRACK-AND-HOLD
12
12
ADC
12-BIT
CORE
OUTPUT
STAGING
LVDS
Dx11 TO Dx0
272 mW @ 170 MSPS
364 mW @ 250 MSPS
Programmable input voltage range
1.0 V to 1.5 V, 1.25 V nominal
CLK+
CLK–
CLOCK
MANAGEMENT
OVRA
OVRB
SERIAL PORT
1.8 V analog and digital supply operation
Selectable output data format (offset binary, twos
complement, Gray code)
DCO+
DCO–
RESET SCLK SDIO CSB
Clock duty cycle stabilizer
Figure 1.
Integrated data capture clock
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The AD9626 is a 12-bit monolithic sampling analog-to-digital
converter optimized for high performance, low power, and ease
of use. The product operates at up to a 250 MSPS conversion
rate and is optimized for outstanding dynamic performance in
wideband carrier and broadband systems. All necessary func-
tions, including a track-and-hold (T/H) and voltage reference,
are included on the chip to provide a complete signal
conversion solution.
1. High Performance—Maintains 64.9 dBFS SNR @ 250 MSPS
with a 70 MHz input.
2. Low Power—Consumes only 364 mW @ 250 MSPS.
3. Ease of Use—CMOS output data and output clock signal
allow interface to current FPGA technology. The on-chip
reference and sample-and-hold provide flexibility in
system design. Use of a single 1.8 V supply simplifies
system power supply design.
The ADC requires a 1.8 V analog voltage supply and a differen-
tial clock for full performance operation. The digital outputs are
CMOS compatible and support either twos complement, offset
binary format, or Gray code. A data clock output is available for
proper output data timing.
4. Serial Port Control—Standard serial port interface supports
various product functions, such as data formatting, clock
duty cycle stabilizer, power-down, gain adjust, and output
test pattern generation.
5. Pin-Compatible Family—10-bit pin-compatible family
offered as the AD9601.
Fabricated on an advanced CMOS process, the AD9626 is
available in a 56-lead LFCSP, specified over the industrial
temperature range (−40°C to +85°C).
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
©2007 Analog Devices, Inc. All rights reserved.