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Analog Devices Semiconductor Electronic Components Datasheet

AD1175K Datasheet

22-Bit Integrating A/D Converter

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~ ANALOG
~ DEVICES
HighAccuracy2,2-Bit
IntegratingAIDConverter
FEATURES
High Resolution: 22 Bits
Wide Dynamic Range: 133dB
Low Nonlinearity:
Integral: :t 0.5ppm max
Differential: :t 0.5LSB max
High Stability:
Gain: :!:1ppm/oC max
Zero: :to.5J.lVrC max
INL: :to.01ppmrC
DNL: :!:O.OO25ppm/oC
OHigh Throughput Rate: 20 Conversions/Second
Microprocessor Compatible Interface
BCompact Modular Package
SAPPLICATIONS
Data Acquisition Systems
OScientific Instruments
Medical Instruments
LWeighing Systems
EAutomatic Test Equipment
TETest and Measurement Equipment
Several modes of operation are available and allow writing to
one of several addressable locations to program gain and offset,
or to initiate a conversion.
The AD 1175 requires no external components and operates
from:!: l5V de and + 5V de power. All digital inputs and outputs
GENERAL DESCRIPTION
are LSTTL compatible. The 3.7" x 5.2" x 0.53" metal case package
The AD 1175 is a very high resolution integrating A/D converter
provides excellent electrostatic and electromagnetic shielding.
intended for applications that require the highest possible accuracy
without sacrificing conversion speed, board space or modest
PRODUCT HIGHLIGHTS
pricing. This converter provides the performance of large bench top
I. The unparalleled dynamic range, accuracy, linearity and
or rack mount instruments in a compact, modular package.
stability of the AD 1175 represent a breakthrough for an A/D
The AD 1175 utilizes an auto-zeroed, multislope, integrating
principle that features 22-bit resolution with extremely low
converter offering small size and modest cost. Only large,
expensive bench top meters offer similar performance.
nonlinearity (Integral: :!:O.5ppm max and Differential: :!:O.5LSB
max). Temperature stability is specified at :!:O.5ppmrC maximum
2. The AD1l75 converts approximately ten times as fast as
digital meters with like performance.
for gain (exclusive of reference), :!:0.5ILV/oC maximum for zero,
:!:O.OlppmrC for integral nonlinearity, and:!: 0.0025ppm/oC for
differential nonlinearity.
The integration time is user selectable for maximum, line frequency
noise rejection at either 60Hz or 50Hz. The conversion rate is
20 or 16 per second respectively, which is many times faster
than benchtop instruments of similar performance.
The nominal full-scale input range is :!:5V; however, rated
accuracy is specified for inputs up to 10% over nominal, yielding
a total dynamic range of greater than 4.6 million to I. The
analog input is a high impedance, high CMRR, true differential
input pair. The input low operates within:!: 100m V of analog
ground and is used to sense signal low (at the source) to minimize
ground loop problems.
The output of the AD 1175 consists of four addressable 8-bit
bytes (STATUS and 3 DATA) presented at an 8-bit tri-stated
3. The microprocessor interface of the AD1175 provides for
straightforward operation, but with the features required for
optimum system performance. Simple commands control
offset adjust, gain adjust, external offset null and initiate
conversions. The output bytes indicate input polarity, off-scale
condition and a variety of additional status information.
4. The AD 1175 is a complete A/D converter including a precision
internal reference, clock and integration capacitor. Offset and
coarse gain adjust are bus controlled, while user accessible
trim potentiometers allow fine gain adjust and:!: full-scale
balance adjust.
5. Conversions may be made using either the offset and coarse
gain settings stored in internal nonvolatile memory, or new
settings made via the bus. The nonvolatile memory may be
updated on command with the new settings.
port with standard chip select.
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 implica-
tion 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
Twx: 710/394-6577
Telex: 924491
Cables: ANALOGNORWOODMASS


Analog Devices Semiconductor Electronic Components Datasheet

AD1175K Datasheet

22-Bit Integrating A/D Converter

No Preview Available !

SPECIFICATIONS(tyPica'@+25°C, - + 5V unlessothelWise
-M-o-d-el-----
RESOLUTION
22-bits + 10%Overrange
(4,600,000 Counts) min
DYNAMIC RANGE
133dB
ACCURACY
Integral Nonlinearity'
Differential Nonlinearity (~l 22 Bits)
Total Noise (Ref to Input, 95% Confidence)
STABILITY
Gain T.e. (Excluding Reference)
ZeroT.e.
Integral Nonlinearity T.e.
Differential Nonlinearity T.e.
POWER SUPPLY REJECTION RATIO(", I5V)
WARMUP TIME
Relative Accuracy (for Rated Performance)
Full Rated Performance
'" 0.5ppm F.S.R.', max
'" O.5LSB,max
5fLVp-pmax
'" IppmRDG/oC,max
"'O.5fLVrC,max
"'O.OlppmF.S.R.'/oC
'" 0.0025ppmF.S.R.'/oC
'" 5ppmF.S.R'iV
IS Minutes
45 Minutes
NOTES
'Integtal Nonhnmity is specified ove< the enti" input span (NOMINAL FULL-SCALE + '0% Ove",nge).
It is specified using the "End Point" definition, whm the moo is mm",ed afteo "moving the ofr." moo and
thc gain mo," at plm and minus full "ale.
'FSR means Full Soak Range which = 10 vol".
'Single ended, g<ound "fe",d.
'Avmge t"nd hne.
'Adiu"ment is penocmed v~ u"o a"",ible IO-tum "im potentiom"eo
'Integoation Time is selwable to eith" 1/30", foc 60H, "iwion. 00 1/25 "c foe SOH, "jwion.
'Thc Nominal Analog Input Voltagc Rangc is "V, but thc ADI175 may be eahbtated foe input voltag" f<om
,4.7V to,5.6V and maint.;n specified a"",,,y ove< thc cnti" tango. induding a 10% on-"ak ovmangc.
Th"cfo", input voltag" of up to ,6.16V will be a"",ately convened whcn eahboated foe ,5.6V Nominal input.
'Conv"", "ction GAIN is digitally adiu"abk. via thc data bus. in "eps of 0.009% f<om <4.7 to >5.6V FS
A um a"",iblc 10-tum "im potentiom"" is also p<ovidcd foe rmc GAIN adiu" (, 0.006% ..ngc).
Alluni" acefactoryeahb..ted foc '5V NominalFull Scalcto within' 50eV
'Input Bandwid!h specifications a" foc tcuc integcation without""hpping.
Specifications subiw to changc without notice.
REFERENCE
External Reference In
OUTLINE DIMENSIONS
For Rated Performance
Maximum Input (Operating Only)
Reference Output
Voltage
'-IOutput Resistance
Temperature Coefficient
Drift with Time'
1st IS Days Operating
After IS Days Operation
ONoise, 0.01 to JOHz (95% Confidence)
User Reference Output
BGain (Referred to Reference In)
Current
Stability: Temperature Coefficient
STHROUGHPUTRATE6
O<!"Integrate Time of 1/30 sec (60Hz)
(wIntegrate Time of 1/25 sec(50Hz)
ANALOG INPUT CHARACTERISTICS
LVoltage Range7.,
Max VINH (at Input Hi, Without Damage)
EMax V'NL (at Input Lo, Without Damage)
Max V'NLR (Input Lo, for Rated Performance)
TInput Resistance (Input Hi, or Input Lo)
EInput BiasCurrent, Input Hi or Input Lo
+6.95V"'2%3
+9.6V
+6.95 "'Z%
Z500
'" OAppm/'C ('" 0.8ppmrC, max)
'" Ippm/Day
'" Z5ppmlv'1000hrs., max
Ippmp-p,max
l.000to1.0IZ'
"'ZmA,max
"'lfLV/oC,max
ZOconversions/sec
16conversions/sec
'" 5V Bipolar
'" 12V
",3V
'" JOOmV
lOOOMO
Dimensions shown in inches and (mm),
NONCONOUCTIVE LABEL
TAIM.POTENTIOMETEA
ACCESS IFAA SIDEI
'_J
NONCONDUCTtVE
HEADEA
( + JOoCto + 50°C)
'" JOnA, typ; '" 40nA, max
Input Bandwidth 9
Small Signal
Large Signal
CMRR at dc to 60Hz
Z.OMHz
150kHz
80dB, min
NOTE, SEEPAGE8FOAAECOMMENDEDSOCKET
ADJUSTMENTS
Offset (Programmable)
Range
Resolution
Gain-Coarse (Programmable)'
Range
Resolution
Gain-Fine RangeS.'
Gain-Balance ('" Full Scale) RangeS
DIGITAL LEVELS
Inputs
Low
High
Outputs
Low(~14mA)
High«!l JOOfLA)
POWER REQUIREMENTS
Supply Voliages (for Rated Accuracy)
",Vs
+Vo
Supply Current Drain
~! '" I5V
After Warm-Up
During Warm-Up
~l +5V
ENVIRONMENTAL
Rated Performance
Operating
Size
Shielding
Weight
",75mV
I LSB Steps
<4.7Vto>5.6V
0.009% Steps
"'0.006%F.S.
'" 0.005% F.S.
0.8V max
2.0V min
OA5V max
ZAV min
",I5V(",0.3Veach)
+5V(-O.ZVto +OAV)
+ 55mA, - 70mA
I5OmA
175mA
JOOCto + 50°C, 70% RH
Oto+70'C
- Z5°C to + 70°C
3.Tx5.2"xO.53"max
Electrostatic, 6 Sides
Electromagnetic,S Sides
170 grams
ASSEMBLY INSTRUCTIONS
CAUTION: This module is not an embedded assembly and is
not hermetically sealed, Do not subject to a solvent or water-wash
process that would allow dir.ect contact with free liquids or
vapors, Entrapment of contaminants may occur, causing per-
formance degradation and permanent damage, Install after any
clean/wash process and then only spot clean by hand,
PIN DESCRIPTIONS
PIN
4
5
6
7
8
9.10
11-18
19
2D
21
22
23
24
25
48.49
58
59
61
62
63
64
65
66
SIGNAL
CONVCMD
RESET
60Hz/50Hz
DONOTCDNNECT
+5V
DIGGND
DBD-DB7
AD
A1
AD
WA
CS
BUSY
DATARDY
+15VRTN&GND
ANAINLO
ANAINHI
15V
SIGNALRTN
+15V
USERREFOUT
REFIN
REF OUT
DESCRIPTION
External ConvertCommand
Aeset Internal Microcomputer Following Pow eo-Up
When Set Low. Integration Time is 1/25 see
When Set High. Integration Time is 1/30 sec
Used Only for Factooy Test
Digital Poweo Supply
Digital Ground (Both Pins are TiedTogetheolnternally)
Bidirectional Data Bus (LSB-MSBI
Address. Bit leco
Addoess. Bit One
READ
WRITE
CHIP SELECT
BUSY. Respondin9 to a Bus Command
DATA READY
Analog Power Ground and Case (Tied Together Internallyl
Analog Input. Low
Analog Input. High
Negative Analog Power Supply
Signal Rotum (Non.Cucrent Cacrying Groundl
Positive Analog Power Supply
Bulleoed Output of Reference at REF IN
Reference Input. Noomally Connected to AEFOUT
Internal + 6.95V Refeoence Output. Unbulleoed
-2-


Part Number AD1175K
Description 22-Bit Integrating A/D Converter
Maker Analog Devices
Total Page 8 Pages
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