AD9484 Datasheet, PDF (1/24 Pages) Analog Devices – 8-Bit, 500 MSPS, 1.8 V Analog-to-Digital Converter Excellent linearity

8-Bit, 500 MSPS,
1.8 V Analog-to-Digital Converter
AD9484
FEATURES
SNR = 47 dBFS at fIN up to 250 MHz at 500 MSPS
ENOB of 7.5 bits at fIN up to 250 MHz at 500 MSPS (−1.0 dBFS)
SFDR = 79 dBc at fIN up to 250 MHz at 500 MSPS (−1.0 dBFS)
Integrated input buffer
Excellent linearity
DNL = ±0.1 LSB typical
INL = ±0.1 LSB typical
LVDS at 500 MSPS (ANSI-644 levels)
1 GHz full power analog bandwidth
On-chip reference, no external decoupling required
Low power dissipation
670 mW at 500 MSPS—LVDS SDR output
Programmable (nominal) input voltage range
1.18 V p-p to 1.6 V p-p, 1.5 V p-p nominal
1.8 V analog and digital supply operation
Selectable output data format (offset binary, twos
complement, Gray code)
Clock duty cycle stabilizer
Integrated data capture clock
APPLICATIONS
Wireless and wired broadband communications
Cable reverse path
Communications test equipment
Low cost digital oscilloscopes
Satellite subsystems
Power amplifier linearization
GENERAL DESCRIPTION
The AD9484 is an 8-bit, monolithic, sampling analog-to-digital
converter (ADC) optimized for high performance, low power,
and ease of use. The part operates at up to a 500 MSPS conver-
sion rate and is optimized for outstanding dynamic performance
in wideband carrier and broadband systems. All necessary
functions, including a sample-and-hold and voltage reference,
are included on the chip to provide a complete signal conversion
solution. The VREF pin can be used to monitor the internal
reference or provide an external voltage reference (external
reference mode must be enabled through the SPI port).
The ADC requires a 1.8 V analog voltage supply and a differen-
tial clock for full performance operation. The digital outputs are
LVDS (ANSI-644) compatible and support twos complement,
offset binary format, or Gray code. A data clock output is available
for proper output data timing.
FUNCTIONAL BLOCK DIAGRAM
VREF PWDN
AGND
AVDD
CML
VIN+
VIN–
CLK+
CLK–
REFERENCE
AD9484
TRACK-AND-HOLD
CLOCK
MANAGEMENT
ADC 8
CORE
SERIAL PORT
OUTPUT 8
STAGING
LVDS
SCLK/DFS SDIO CSB
Figure 1.
DRVDD
DRGND
D7± TO D0±
OR+
OR–
DCO+
DCO–
Fabricated on an advanced BiCMOS process, the AD9484 is availa-
ble in a 56-lead LFCSP, and is specified over the industrial
temperature range (−40°C to +85°C). This product is protected
by a U.S. patent.
PRODUCT HIGHLIGHTS
1. High Performance.
Maintains 47 dBFS SNR at 500 MSPS with a 250 MHz input.
2. Ease of Use.
LVDS 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.
3. Serial Port Control.
Standard serial port interface supports various product
functions, such as data formatting, power-down, gain
adjust, and output test pattern generation.
Rev. A
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 registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone]
©2011 Analog Devices, Inc. All rights reserved.