AD9284 Datasheet PDF - Analog Devices

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AD9284
Analog Devices

Part Number AD9284
Description 1.8 V Dual Analog-to-Digital Converter (ADC)
Page 25 Pages


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Data Sheet
8-Bit, 250 MSPS, 1.8 V Dual
Analog-to-Digital Converter (ADC)
AD9284
FEATURES
GENERAL DESCRIPTION
Single 1.8 V supply operation
SNR: 49.3 dBFS at 200 MHz input at 250 MSPS
SFDR: 65 dBc at 200 MHz input at 250 MSPS
Low power: 314 mW at 250 MSPS
On-chip reference and track-and-hold
1.2 V p-p analog input range for each channel
Differential input with 500 MHz bandwidth
LVDS-compliant digital output
DNL: ±0.2 LSB
Serial port control options
Offset binary, Gray code, or twos complement data format
Optional clock duty cycle stabilizer
Built-in selectable digital test pattern generation
Pin-programmable power-down function
Available in 48-lead LFCSP
APPLICATIONS
Communications
Diversity radio systems
I/Q demodulation systems
Battery-powered instruments
Handheld scope meters
Low cost digital oscilloscopes
OTS: video over fiber
The AD9284 is a dual 8-bit, monolithic sampling, analog-to-digital
converter (ADC) that supports simultaneous operation and is
optimized for low cost, low power, and ease of use. Each ADC
operates at up to a 250 MSPS conversion rate with outstanding
dynamic performance.
The ADC requires a single 1.8 V supply and an encode clock for
full performance operation. No external reference components
are required for many applications. The digital outputs are LVDS
compatible.
The AD9284 is available in a Pb-free, 48-lead LFCSP that is
specified over the industrial temperature range of −40°C to +85°C.
PRODUCT HIGHLIGHTS
1. Integrated Dual 8-Bit, 250 MSPS ADC.
2. Single 1.8 V Supply Operation with LVDS Outputs.
3. Power-Down Option Controlled via a Pin-Programmable
Setting.
FUNCTIONAL BLOCK DIAGRAM
SDIO/
PWDN CSB SCLK
OE
CLK+
CLK–
VIN+A
VIN–A
VCM
VREF
1.0V
VREF
SPI
ADC
D7+ (MSB), D7– (MSB)
D0+ (LSB), D0– (LSB)
(CHANNEL A)
REF
SELECT
×1.5
CLOCK
MANAGEMENT
DCO
GENERATION
DCO+
DCO–
VIN–B
VIN+B
ADC
D7+ (MSB), D7– (MSB)
D0+ (LSB), D0– (LSB)
(CHANNEL B)
AD9284
RBIAS
AGND
AVDD DRVDD DRGND
Figure 1.
Rev. A
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Tel: 781.329.4700 ©2011–2013 Analog Devices, Inc. All rights reserved.
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AD9284* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
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Evaluation Kits
• AD9284 Evaluation Board
Documentation
Application Notes
• AN-1142: Techniques for High Speed ADC PCB Layout
• AN-282: Fundamentals of Sampled Data Systems
• AN-345: Grounding for Low-and-High-Frequency Circuits
• AN-501: Aperture Uncertainty and ADC System
Performance
• AN-586: LVDS Outputs for High Speed A/D Converters
• AN-715: A First Approach to IBIS Models: What They Are
and How They Are Generated
• AN-737: How ADIsimADC Models an ADC
• AN-742: Frequency Domain Response of Switched-
Capacitor ADCs
• AN-756: Sampled Systems and the Effects of Clock Phase
Noise and Jitter
• AN-827: A Resonant Approach to Interfacing Amplifiers to
Switched-Capacitor ADCs
• AN-835: Understanding High Speed ADC Testing and
Evaluation
• AN-851: A WiMax Double Downconversion IF Sampling
Receiver Design
• AN-878: High Speed ADC SPI Control Software
• AN-905: Visual Analog Converter Evaluation Tool Version
1.0 User Manual
• AN-935: Designing an ADC Transformer-Coupled Front
End
Data Sheet
• AD9284: 8-Bit, 250 MSPS, 1.8 V Dual Analog-to-Digital
Converter (ADC) Data Sheet
User Guides
• UG-178: Evaluating the AD9284 Analog-to-Digital
Converter
Tools and Simulations
• Visual Analog
• AD9284 IBIS Model
Reference Materials
Technical Articles
• MS-2210: Designing Power Supplies for High Speed ADC
Design Resources
• ad9284 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
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Sample and Buy
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Technical Support
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AD9284
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
DC Specifications ......................................................................... 3
AC Specifications.......................................................................... 4
Digital Specifications ................................................................... 5
Switching Specifications .............................................................. 6
SPI Timing Specifications ........................................................... 6
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ........................................... 10
Equivalent Circuits ......................................................................... 12
Theory of Operation ...................................................................... 13
ADC Architecture ...................................................................... 13
Analog Input Considerations.................................................... 13
REVISION HISTORY
6/13—Rev. 0 to Rev. A
Changes to Clock Input Parameters, Table 4 .................................6
1/11—Revision 0: Initial Version
Data Sheet
Voltage Reference ....................................................................... 13
RBIAS........................................................................................... 13
Clock Input Considerations...................................................... 14
Digital Outputs ........................................................................... 14
Built-In Self-Test (BIST) and Output Test .................................. 15
Built-In Self-Test (BIST)............................................................ 15
Output Test Modes..................................................................... 15
Serial Port Interface (SPI).............................................................. 16
Configuration Using the SPI..................................................... 16
Hardware Interface..................................................................... 17
Configuration Without the SPI ................................................ 17
SPI Accessible Features.............................................................. 17
Memory Map .................................................................................. 18
Reading the Memory Map Register Table............................... 18
Memory Map Register Table..................................................... 19
Memory Map Register Descriptions........................................ 21
Applications Information .............................................................. 22
Design Guidelines ...................................................................... 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
Rev. A | Page 2 of 24



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Data Sheet
AD9284
SPECIFICATIONS
DC SPECIFICATIONS
AVDD = 1.8 V, DRVDD = 1.8 V, 1.0 V internal ADC reference, unless otherwise noted.
Table 1.
Parameter1
RESOLUTION
DC ACCURACY
Differential Nonlinearity
Integral Nonlinearity
No Missing Codes
Offset Error
Gain Error
MATCHING CHARACTERISTICS
Offset Error
Gain Error
TEMPERATURE DRIFT
Offset Error
Gain Error
ANALOG INPUT
Input Span
Input Common-Mode Voltage
Input Resistance (Differential)
Input Capacitance (Differential)
Full Power Bandwidth
VOLTAGE REFERENCE
Internal Reference
Input Resistance
POWER SUPPLIES
Supply Voltage
AVDD
DRVDD
Supply Current
IAVDD
IDRVDD
POWER CONSUMPTION
Sine Wave Input2
Power-Down Power
Temperature
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Min
8
0
0
0
0
0.97
1.7
1.7
Typ Max
±0.2
±0.1
Guaranteed
±0.4
±2.5
±0.5
±0.1
±2
±20
1.2
1.4
16
250
700
0.98
3
±0.4
±0.3
±2.1
±2.8
±2.6
±0.7
0.99
1.8 1.9
1.8 1.9
124 128
51 54
314 330
0.3 1.7
Unit
Bits
LSB
LSB
% FS
% FS
% FS
% FS
ppm/°C
ppm/°C
V p-p
V
fF
MHz
V
V
V
mA
mA
mW
mW
1 See the AN-835 Application Note, Understanding High Speed ADC Testing and Evaluation, for a complete set of definitions and an explanation of how these tests were
completed.
2 Measured with a low frequency, full-scale sine wave, with approximately 5 pF loading on each output bit.
Rev. A | Page 3 of 24



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