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AD9288 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD9288
Beschreibung Dual A/D Converter
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 25 Seiten
AD9288 Datasheet, Funktion
FEATURES
Dual 8-bit, 40 MSPS, 80 MSPS, and 100 MSPS ADC
Low power: 90 mW at 100 MSPS per channel
On-chip reference and track-and-hold
475 MHz analog bandwidth each channel
SNR = 47 dB @ 41 MHz
1 V p-p analog input range each channel
Single 3.0 V supply operation (2.7 V to 3.6 V)
Standby mode for single-channel operation
Twos complement or offset binary output mode
Output data alignment mode
Pin-compatible 10-bit upgrade available
APPLICATIONS
Battery-powered instruments
Hand-held scopemeters
Low cost digital oscilloscopes
I and Q communications
GENERAL DESCRIPTION
The AD9288 is a dual 8-bit monolithic sampling analog-to-
digital converter with on-chip track-and-hold circuits. It is
optimized for low cost, low power, small size, and ease of use.
The product operates at a 100 MSPS conversion rate with
outstanding dynamic performance over its full operating range.
Each channel can be operated independently.
The ADC requires only a single 3.0 V (2.7 V to 3.6 V) power
supply and an Encode clock for full-performance operation. No
external reference or driver components are required for many
applications. The digital outputs are TTL/CMOS-compatible,
and a separate output power supply pin supports interfacing
with 3.3 V or 2.5 V logic.
8-Bit, 40/80/100 MSPS
Dual A/D Converter
AD9288
FUNCTIONAL BLOCK DIAGRAM
VDD
ENCA
AINA
AINA
REFINA
REFOUT
REFINB
AINB
AINB
ENCB
TIMING
AD9288
8
T/H ADC
REF
T/H
TIMING
8
ADC
8
D7A–D0A
SELECT 1
SELECT 2
DATA FORMAT
SELECT
8
D7B–D0B
VD GND
Figure 1.
VDD
The Encode input is TTL/CMOS-compatible, and the 8-bit
digital outputs can be operated from 3.0 V (2.5 V to 3.6 V)
supplies. User-selectable options offer a combination of standby
modes, digital data formats, and digital data timing schemes. In
standby mode, the digital outputs are driven to a high
impedance state.
Fabricated on an advanced CMOS process, the AD9288 is
available in a 48-lead surface-mount plastic package (7 mm ×
7 mm, 1.4 mm LQFP) specified over the industrial temperature
range (–40°C to +85°C). The AD9288 is pin-compatible with
the 10-bit AD9218, facilitating future system migrations.
Rev. C
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: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.






AD9288 Datasheet, Funktion
TIMING DIAGRAMS
AD9288
SAMPLE N
SAMPLE N + 1
SAMPLE N + 5
AINA, AINB
tA
ENCODE A, B
tEH tEL
1/fs
SAMPLE N + 2 SAMPLE N + 3
SAMPLE N + 4
D7A–D0A
DATA N – 4
DATA N – 3
DATA N – 2
tPD
DATA N – 1
DATA N
tV
DATA N + 1
D7B–D0B
DATA N – 4
DATA N – 3
DATA N – 2
DATA N – 1
DATA N
Figure 2. Normal Operation, Same Clock (S1 = 1, S2 = 0) Channel Timing
DATA N + 1
SAMPLE SAMPLE SAMPLE SAMPLE SAMPLE
N
N+1
N+2
N+3
N+4
AINA, AINB
tA
tEH tEL
ENCODE A
1/fs
ENCODE B
tPD
tV
D7A–D0A
D7B–D0B
DATA N – 8
DATA N – 6
DATA N – 4
DATA N – 2
DATA N
DATA N + 2
DATA N – 7
DATA N – 5
DATA N – 3
DATA N – 1
DATA N + 1 DATA N + 3
Figure 3. Normal Operation with Two Clock Sources (S1 = 1, S2 = 0) Channel Timing
Rev. C | Page 5 of 24

6 Page









AD9288 pdf, datenblatt
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
CODE
Figure 18. Integral Nonlinearity
CODE
Figure 19. Differential Nonlinearity
AD9288
1.3
ENCODE = 100MSPS
1.2
VD
TA
=
=
3.0V
25°C
1.1
1.0
0.9
0.8
0.7
0
0.25 0.50 0.75 1.00 1.25 1.50
LOAD (mA)
Figure 20. Voltage Reference Out vs. Current Load
1.75
Rev. C | Page 11 of 24

12 Page





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