AD9257 반도체 회로 부품 판매점
1.8V ANALOG-TO-DIGITAL CONVERTER
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 Analog Devices |
Data Sheet
Octal, 14-Bit, 40/65 MSPS, Serial LVDS,
1.8 V Analog-to-Digital Converter
AD9257
FEATURES
Low power: 55 mW per channel at 65 MSPS with scalable
power options
SNR = 75.5 dB (to Nyquist)
SFDR = 91.6 dBc (to Nyquist)
DNL = ±0.6 LSB (typical), INL = ±1.1 LSB (typical)
Serial LVDS (ANSI-644, default)
Low power, reduced signal option (similar to IEEE 1596.3)
Data and frame clock outputs
650 MHz full power analog bandwidth
2 V p-p input voltage range
1.8 V supply operation
Serial port control
Full chip and individual channel power-down modes
Flexible bit orientation
Built-in and custom digital test pattern generation
Programmable clock and data alignment
Programmable output resolution
Standby mode
APPLICATIONS
Medical imaging and nondestructive ultrasound
Portable ultrasound and digital beam-forming systems
Quadrature radio receivers
Diversity radio receivers
Optical networking
Test equipment
GENERAL DESCRIPTION
The AD9257 is an octal, 14-bit, 40 MSPS and 65 MSPS analog-
to-digital converter (ADC) with an on-chip sample-and-hold
circuit designed for low cost, low power, small size, and ease of
use. The product operates at a conversion rate of up to 65 MSPS
and is optimized for outstanding dynamic performance and low
power in applications where a small package size is critical.
The ADC requires a single 1.8 V power supply and LVPECL-/
CMOS-/LVDS-compatible sample rate clock for full performance
operation. No external reference or driver components are
required for many applications.
The ADC automatically multiplies the sample rate clock for the
appropriate LVDS serial data rate. A data clock output (DCO) for
capturing data on the output and a frame clock output (FCO) for
signaling a new output byte are provided. Individual channel
power-down is supported and typically consumes less than
2 mW when all channels are disabled.
The ADC contains several features designed to maximize flexibility
and minimize system cost, such as programmable clock and data
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
AVDD
PDWN
DRVDD
VIN+ A
VIN– A
AD9257
14
ADC
SERIAL
LVDS
D+ A
D– A
VIN+ B
VIN– B
14
ADC
SERIAL
LVDS
D+ B
D– B
VIN+ C
VIN– C
14
ADC
SERIAL
LVDS
D+ C
D– C
VIN+ D
VIN– D
14
ADC
SERIAL
LVDS
D+ D
D– D
VIN+ E
VIN– E
14
ADC
SERIAL
LVDS
D+ E
D– E
VIN+ F
VIN– F
14
ADC
SERIAL
LVDS
D+ F
D– F
VIN+ G
VIN– G
14
ADC
SERIAL
LVDS
D+ G
D– G
VIN+ H
VIN– H
14
ADC
SERIAL
LVDS
D+ H
D– H
www.DataSheet.net/
VREF
SENSE
VCM
SYNC
REF
SELECT
1.0V
SERIAL PORT
INTERFACE
DATA
RATE
MULTIPLIER
FCO+
FCO–
DCO+
DCO–
RBIAS
AGND
CSB SDIO/ SCLK/
DFS DTP
Figure 1.
CLK+ CLK–
alignment and programmable digital test pattern generation. The
available digital test patterns include built-in deterministic and
pseudorandom patterns, along with custom user-defined test
patterns entered via the serial port interface (SPI).
The AD9257 is available in an RoHS-compliant, 64-lead LFCSP.
It is specified over the industrial temperature range of −40°C
to +85°C. This product is protected by a U.S. patent.
PRODUCT HIGHLIGHTS
1. Small Footprint. Eight ADCs are contained in a small,
space-saving package.
2. Low Power of 55 mW/Channel at 65 MSPS with Scalable
Power Options.
3. Ease of Use. A data clock output (DCO) is provided that
operates at frequencies of up to 455 MHz and supports
double data rate (DDR) operation.
4. User Flexibility. The SPI control offers a wide range of
flexible features to meet specific system requirements.
5. Pin Compatible with the AD9637 (12-Bit Octal ADC).
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
Datasheet pdf - http://www.DataSheet4U.co.kr/
AD9257
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights ........................................................................... 1
Table of Contents .............................................................................. 2
Revision History ............................................................................... 2
Specifications..................................................................................... 3
DC Specifications ......................................................................... 3
AC Specifications.......................................................................... 4
Digital Specifications ................................................................... 5
Switching Specifications .............................................................. 6
Timing Specifications .................................................................. 6
Absolute Maximum Ratings............................................................ 8
Thermal Characteristics .............................................................. 8
ESD Caution.................................................................................. 8
Pin Configuration and Function Descriptions............................. 9
Typical Performance Characteristics ........................................... 11
AD9257-65 .................................................................................. 11
AD9257-40 .................................................................................. 14
Equivalent Circuits ......................................................................... 17
Theory of Operation ...................................................................... 18
Analog Input Considerations.................................................... 18
Voltage Reference ....................................................................... 19
REVISION HISTORY
10/11—Revision 0: Initial Version
Data Sheet
Clock Input Considerations...................................................... 20
Power Dissipation and Power-Down Mode ........................... 22
Digital Outputs and Timing ..................................................... 23
Built-In Output Test Modes .......................................................... 27
Output Test Modes..................................................................... 27
Serial Port Interface (SPI).............................................................. 28
Configuration Using the SPI..................................................... 28
Hardware Interface..................................................................... 29
Configuration Without the SPI ................................................ 29
SPI Accessible Features.............................................................. 29
Memory Map .................................................................................. 30
Reading the Memory Map Register Table............................... 30
Memory Map Register Table..................................................... 31
Memory Map Register Descriptions........................................ 34
Applications Information .............................................................. 36
Design Guidelines ...................................................................... 36
Power and Ground Recommendations ................................... 36
Exposed Pad Thermal Heat Slug Recommendations............ 36
VCM............................................................................................. 36
Referencewww.DataSheet.net/ Decoupling................................................................ 36
SPI Port ........................................................................................ 36
Outline Dimensions ....................................................................... 37
Ordering Guide .......................................................................... 37
Rev. 0 | Page 2 of 40
Datasheet pdf - http://www.DataSheet4U.co.kr/
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AD9257 converter
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