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PDF ( 数据手册 , 数据表 ) AD9016

零件编号 AD9016
描述 A/D Converter
制造商 Analog Devices
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AD9016 数据手册, 描述, 功能
ANALOG DEVICES FAX-ON-DEMANDHOTLINE - Page 16
,. ANALOG
W DEVICES
HighSpeed6-Bit
AIDConverters
I AD9006/AD9016I
FEATURES
FUNCTIONAL BLOCK DIAGRAM
500MSPS Encode Rate
Very Low Input Capacitance: 8pF
3OdBSNR @ 200M Hz Analog Input
MIL-STD-883 Available
Bipolar Input Range (:t1V)
Demultiplexed Outputs (AD9016)
Mll-STD-883-Compliant Versions Available
DD ., Dol 'NVERT
.
MS. !NVERT "
~A~~~Z~1
to
..09016
OUTI'tJT
LATCHES
'8) OVERFLOW A
BAN' A
APPLICATIONS
Radar Warning Receivers
Electronic Countermeasures
Transient Recorders
"Smart" Munitions
Digital Oscilloscopes
OBSGENERAL DESCRIPTION
The AD9006 and AD9016 are 6-bit, ultrahigh speed analog-ro-
Odigital converters. Both are fabricated in an advanced bipolar
process, assuring exceptionally wide analog input bandwidth,
Land encode rates up to SOOMSPS.Functionally, the AD9006
Eand AD9016 use "flash" architecture; the outputs of 64 parallel
comparator stages are decoded to drive a bank of ECL output
TElatches.
""
:,,,, I
I
I
I
I
L
~----
(Dotted Area Not Included in AD9006)
The AD9006 and AD9016 are available as commercial tempera-
ture range devices: 0 to + 70°C; and military temperatUre range
The AD9006 features a bipolar analog input range (:t IV). Out-
devices: - 55°C to + 125°c. Both versions are offered in a ce-
put data is provided in a single 6-bit data bank; the data is ECL
compatible and also includes complementary Data Ready signals
and an overflow bit. ECL-Ievel control pins allow the user to
ramic 68-pin LCC, and a ceramic 68-pin leaded package.
The AD9006/AD9016 are available in versions compliant with
invert the MSB and/or LSBs. The AD9006 exhibits excellent
SNR performance (30dB SNR Ca.2:00MHz input), and requires
less than two watts of power.
MIL-STD-883. Refer to the Analog Devices Military Products
Databook or current AD9006/AD9016/883B data sheet for de-
tailed specifications
In the AD9016, the performance and features of the AD9006
are combined with on-board demultiplexing circuits. Output
data of the AD9016 are demultiplexed to two 6-bit data banks,
each of which includes a Data Ready signal and overflow bit.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106. Norwood. MA 02062.9106. U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
Twx: 710/394-6577
Telex: 924491
Cable: ANALOG NORWOODMASS







AD9016 pdf, 数据表
ANALOG DEVICES fAX-ON-DEMAND HOTLINE - Pag" 23
AD9006/AD9016
APPL YING THE AD9006/AD9016
Setting Reference Levels
One method of nulling the offset errors is shown in Figure 1-
Th~ AD9006/AD9016 requires that the user provide two voltage
ret~rc:n..:es:+ Y REFand -- VREF' These two voltages are applied
across th~ internal resistor ladder (nominally 8011)and deter-
mine the analog input range of the converter.
Care should ~ taken to assure that these references are driven
The Analog Devices ADI403 voltage reference supplies a
stable 2.5V reference for the circuit, and RI.1MITdetermines
the range over which the reference can be adjusted. RI adjusts
the voltage at the top of the internal reference ladder through
the AD64lflN3904 combination. Feedback from the + VSENSE
from stable..low impedance sources. Reference connections
line causes the op amp to compensate for offset which appears at
should ~ capacitively coupled to ground to reduce interference
the top comparator threshold. The transistor limits the amount
generated by noise and/or digital switching.
of current drawn directly from the up amp; resistors at the base
Resistance between the reference connections and the point at
and emilter of the transistor stabilize its operation.
which the first comparator threshold is connected causes offset
Voltage at the bottom of the reference ladder is controlled in
errors. These errors, called "top and bottom of the ladder
offsets," can be nulled oUt using the + VSENSEand ---VSENSE
connections. These sense lines are intended for connection only
to high impedance (low current) nodes such as the input of an
op amp.
Applying a voltage greater than l.IV across the internal resistor
ladder will cause current densities to exceed rated values and
Omay cause permanent damage to the AD9006lAD9016.The
amount of current available at the reference connections must be
Blimited.
essentially the same way, using Rz to adjust the reference ladder
voltage; and using feedback from the - VSENSEconnection to
null any offset between the reference and the threshold of the
bottom comparator.
The midpoint of the comparator reference ladder (MIDSCALE
VREF)is shown tied to ground in Figure I. This allows the user
[0 adjust the voltage reference for minimum integral nonlinear-
ity. This featUre becomes important in applications with reduced
analog input ranges because integral nonlinearity increases under
these conditions.
SOLAD1403
VO~TAGE
EREFERENCE
TEVooT=2.SV
Ru....
R,
1011
1010
+SV
2NJ904
10
AD9006! AD9016
+vR..
+v......
MIDSCALE v....
R. -v......
10
-v...,
2NJ906
Figure 1. Reference Circuit
Driving the Analog Input
Careful design and layout of the AD9006/AD9016 have resulted
in a typical input capacitance oC8pF (9.5pF max). This is low
in comparison to most flash converters, but it is still a signifi-
cant load at high input frequencies and must be taken into ac-
count when choosing a drive amplifier.
DC-coupled applications require the performance characteristics
of a wide bandwidth, low distortion op amp such as the Analog
Devices AD96 I 1. AC-coupled applications at high frequencies
may be better served by using a low distortion gain block for
the driver.
Figure 2 illustrates possible connections for both approaches.
Regardless of which driving circuit is selected Corthe applica-
tion, the overall dynamic performance of the amplifier is en-
hanced by inserting a small series resistor between the output of
the amplifier and the analog input of the converter.
ANALOG
SOURCE
RMATCH
R..
AD9006/
R.
AD9016
ANA~OG
INPUT
ANALOG
SOURCE
15001
AD9006/
AD9016
ANA~OG
INPUT
REV.A
+v.
8.
-v.
Figure 2. Analpg Input Circuits
-9-
b.














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