ANALOGDEVICES fAX-ON-DEMAND HOTLINE
-
Page
6
N
I
W
DEVICES
ANALOG
LowPower14-B-it,
15Bit & 16-Bit
Sampling
Analog-to-Digital
Converters
DAS1157 /DAS1158/DAS 1159
I
OBS
APPUCA T1ONS
FEATURES
Complete with High Accuracy Semple/Hold and
AIDConverter
Low Power Conaumption: 850mW mu. v. = :t:15V
Rated Pedormence:
25"'<:o + BS"'<:
t
Low Nonlinearity (DAS1158and DAS1159)
Differential: :t:0.0015% FSR max
Integral: :0.003% FSR max
Dlff8r8ntial T.C.: %1ppmrc me.
High Throughput Rete: 18kHz min
Byte-Selectable Tri-State Buffered Outputs
Internel Geln . Offset Potentiometers
Improved Second Source to
AlD/A/M434
end
AlD/AJM.&35
Modules
FUNCTIONAL BLOCK DIAGRAM
.., our
... 'N"'U
"NA~DO
-
'
TAl.
SU'E
IUFFE~S
"""'T .
{
.
...SO
"'$1
II'.
lIT.
IIr I
liT'
I,r
1
fOIl0""""
liT'
I
(lIT
'" fL$&1
,$It< 'NPU'
LO .NAllE
liT .
liT.
S/H CONT.Ol
IIr '.
lIT 11
liT t2
lIT "
lIT " 1LS8
lIT to ILS8
.SV
DIGITAL"""
Seismic Date Acquisition
Portable ReId Instrumentation
Automated Test Equipment
Proceu Control Date Acquisition
Medical Instrumentation
GENERAL DESCRIPTION
The DASllS7/DASllS8/DASl1S9 are 1+/lS-/16-bit sampling
aualog-to-disital converters. They are ideally suited for use in
portable and remote data acquisition equipment where low
power consumption (6SOmWmuimum) and wide temperature
range (
2S"C
to +
85"C rated perfOrmaDcc) are required.
-
DASllS7IDASl1S8IDASllS9 provide guaranteed high accuracy
and high stability system pcrfOrmaDCC
essential to medical,
analytical and process control equipment: differential nonlinearity
of :O.OOIS% max and integral Donlincarity of :0.003% max
(DASllS8 and DASllS9); DOmissing codes guaranteed; pin
T.C. of :8ppmf'C max. zero T.C. of :80Jl.VIOC IOU and
differential nonlinearity T.C. of : IppmI"C max.
The wide dynamic range will enhancc the pcrfOrmaDCC critical
of
mcuurc:mentS in au and liquid chromatography, blood aualyzcrs,
distributed data acquisitioD in factory automatioD and power
sencrating equipment, and in automatic test equipment.
OLE
TE
"N.&I.OG
"NO
-ISV
. ..v
DAS"."
0"""..,
+'SV
"'NAlOG . OIGrr aNOS
AMO
..:~~~
!!!!".!!AlL:!
.",NuT
..-
"_ANAlOO
~O
II
ullO
"""
The DASllS7IDASllS8/DASllS9 make use of Analog Devices'
proprietary CMOS technology to acb.ieve low power operation,
while utilizing the latest integrated circuit and thin-film compo-
nentS to achieve the highest level of pcrfOrmaDCC reliability.
and
As shown in Figure 1, each device CODtains precision samplclhold
a
amplifier, high accuracy
l+1IS-/l6-bit
analog-to-digital converter,
precision referencc. CMOS tri-state output buffen (for direct 8.
bit or 16-bit bus interface), user accessible pin and offset adjust
potentiometers, and power supply bypass capac:iton, all in a
compact low profile 2~x"" x
0.37S"
metal casc paclcagc.No
additional componenu are required for operation.
I
~
ANALOGDEVICES fAX-ON-DEMAND HOTLINE
- Page 7
DAS1157
/DAS1158/DAS1159
-SPECIFICATIONS
(typical
MODEL
RESOLUTION
OYNAMICP5RfORMANCE
!"hroughput Ra'e
Co.""nion
Time
S H Acqo..Iuon Time
S HApertutCDc!:ay
S H Apertore UncertainlY
F«dthlOUlih Re;«lion'
Droop Ral.
DICI.",I, Abs<>rp<ion Error
,~CCt:RACY
10'CiI"'1 Noohnearuy'
DIII.reoti,1
Nonhnan,y'
NoMIS,ingCod'"
:JO'Noi..,SiHplu'ND\
:3<YNOIse(NDJ
STABILITY
D,ICerential Nonlinearity
Ga,nT.C,
ZeroT,C,
Conver..onTimcT,C,
Po",er Supply Senslti..ty
Warm.Up Time
T.c.
@ +25°C,Vs= ::t15V,
Yo= +5Y
unless otherwise specified)
~57
148111
18kHzmin
SO""......
S".mu
2SOn,
I..
-9Od8min
O,DS,.VI,.,.O.I"VI",.mu
: 0,005%oflnpuI oltagcChani<
V
:0 005% FSR'mu
= D.OOJ% FSR'maa
Guarante<d
0,0022%!>,p(7~",V
rm,)
0.OOI5%!>,p(SO...Vrm.)
~
158i..
~S9
1681..
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm),
r""""""""""""
~
I
:0,003% FSR'"""
"O.OOI~%FSR'mul
..
= Ippmi"Cmu
N'
01'
:.::},::O::
-II
L
c
""
:.-.1
.......
00'.""".',,"'0_'
'_o..~
IT-
~""..-
~T
T
'M
~~'
I
OBS
ANALOGIN'I'UT
Voltage Rani<
8ipolar
Unipolar'
IlDe Inpul Impe<J&nce Qto + ~V
0,o+IDV.=5V
",-IOV
S;H Inpu,lmpcdanco
:: lppmf'Cmu
:0: ppmf'Cmu
8
:3Oi;Y,'Ctyp, "'-SO...VI"Cmax
:O.O~%I"C
:O,OOI%FSR'!%V.
I._lhen I Minu,e
..-
II'
.u
...
",
...
'"
"'
-
::+
1!jL':""
...",....-
.
..'
~,:~:~
t, t, 4-;-++i
"""...~-...
....
"'" ""
coo
.
;
c+',
'
,
, """""
::::::
..",",
::..."':]
" 0""
,
,
J
.f++-; ~
~
..,"""
'°
,
dV. :: JOV
010+SV.O,o+10V
UkH
S1<O
10k/J
IOOMO!5pl"
"".....
, ""."".."..,
,...""",
"'-"""""""."",""'" ,
ASSIUO1.Y INSI'aUCJ1ONS
i:j:
::t:
';";..;..j
;'
-iI-""""'*'
!
DIGITAL INPUTS
AiD Trill«..'
lope Level'
SIHConllol
Low Enable. High Enabl.'
DIGITAL OUTPUTS
P,rallel Data 0011'0"
Unipolar
8ipow
OUlPOI Dri..
EndoCConvenion
OUlpul Dri.e
Politi.. Pulse, Ncg, Ed.. Tri".rcd
SVCMOSeompatible
SAMPLE. Logi. I. TIL Compatible
ENABLE- l.os1cO. CMOSrrrt. Compatible I-
8inary
Off... BillllY, 2', Complemen,
2TIL Looa,
U>gic"I" DurinJCon..nion
2TIL Looa.
+ IOV, ,,0,3%
ZmA......
INTERNAL REFERE."ICE VOLTAGE
E..emal Looa Cor"",' (R.ud Pfflormln<t)
POWER REQUIREMENTS
Rated Voltaps
Voltavcs'"
Ope..u..
SupplyCortenlDrain
'" ISV
+5V
To<alpo...,('_..mp,Ion.
TEMPERATURE
RANGE
RI,ed P.rformance
Ys.
"'- ISV
:ISV(:o:3%},+5V(:S%)
"'-lZVto:!: 17V, .4.75Vto + S.2SV
:!:15mA
IOmA
SOOmWtyp,6SOmWmu
OLE
TE
CAtmON:
- ~.-IoG.
poriormaDot ~
Thia
modWe
-
- -.Id
d.izecz
00III8CI
.nmfiwliqllida
or
npon. ED
,. of""'-
may
"""". ~
Do aubic<. ",,-, .. --1rIIb
-
10
ODd
~,
WoaII aI\Iot
ia
- aDaraIJeddod
.-mbIy
azo4
II
.., -
-
ODd 0GIy doaa
-
ttpOt bybuod.
SeeNo.. 7
SeeN"'e 7
Oper..,..
5'°""
llel..ivcHumidiry
Shielding
SIZE
-ZS'l:to +8S'I:
-25'1:10 +8~'I:
- 40'1: 10 + 100'1:
Moo.. MIL.STD.2DZE, MC1hod1038
Elec"o...,;. (RFI)6 Sid..
Electromagnelic (EM!) 5Sid..
Z-,
4"' 0,37S"MctalP..kagc
NOTES
'S"",."."
OASIII7
"s""'"""""""'"
OASII5a
'M_.m! ,. 0<>44 I.p'" lOVpk." (" 'OkH..
',",""'-UM ,.nun.- 0/ SIHUIdAiD_Io_ity ,non.
'FSR
FuJIS<ak""""
-!..owE- ... ,
By"
II
By,e
£
pi.
... MSB.
Msa.. Bi,16...
ai" 2,""'" 1.
'OAStaO
...,.."" 'odBoo
;,
,.. IIIOdifn"'" f
"
InB.. ,-
a
II,H-
,
'[);ff"""..,
"'
oO.OOJ'"
.yp""fa< OAS1I51.
'..
OASta
OM"'o,
"""". ""'_"0' ,heT~ ... ,...SIH
""""" ...........
0_""'. ""...be ."". Oft."
be"",,-
C
51H
""p""" ..",qu,...heinpu.
'",he..."""
,. ""
(
moo'. '0, ,<,,0
It
"'.,.."", ooIy uood,
"
,...T"- ".J.. 'Old..
,
b<I., mm F
,...
J},
my,. ... 0,. . IV
,
-
~'
'_,"'51H
-7V).
'1l
(MS
m... b<in
\---~
only. MMSB
1
_.
.. ,"'-
loc
_Ii.. .......-.-,..
-V",..,
,
,
V" .I2Vdt
,
..,..,..
-
,
'"","_.
ole """
""'"
"
"
.10...
"""""..
'
s"..,r~t
w """" 5"""1' A.wo, Doviots 041' 92J,
"
~
ANALOGDEVICES FAX-ON-DEMANDHOTLINE
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Page
B
[
OPERATION
For operation, the only connections necessary to the DASl1S71
DASllS8IDASllS9 are the :t:15V and +
SV
power supplies,
analog input signal, trigger pulse, and the HI-ENABLElLO-
ENABLE tn-state controls. Analog input and digital. output
p~
are user selectable via external jumper
connections.
Input voltaiC ranges arc selectable via user pin programming: 0
to +5V,Oto +lOV, :t:SVand :t:lOV. Unipolar coding is provided
in trUe binary format with bipolar coding displayed in offset
binary and tWo'Scomplement (DASI lS7and DAS1l58). DAS1159
unipolar coding is provided in a modified binary format (MSB
complement) while bipolar coding is tWo's complement only.
ANALOG INPUT SECTION
The analog input can be applied to just the AID converter or to
the internal samplelhold ampliflCt"ahead of the AID converter.
When using just the AID converter, apply the analog input per
the voltap: ranae pin programming shown in Table I. When
using the samplelhold amplifier in conjunction with AID con-
verter, apply the analog input to the SIH INPUT terminal and
connect the SIH OUTPUT terminal to the appropriate AID
converter analog input.
Ana1o&
Voitap
Applying DAS1157/DAS1158/DAS1159
the
Errors due to source loading are eliminated since the samplClhold
amplifier is a high-impedance unity-gain amplifier. High feed-
through rejection is provided for either single-channc1or multi.
channel applications. Feedthrough rejection can be optimized,
in multiclwmc1 applications, by changing channels at the rising
or falling edge of the 8tH control pulse.
TIMING D IAGRAM
The timing diagram for the DASIlS7/DA51l58/DA81159 is
illustrated in Figure 3. This figure also includes the samplClhold
amplifier acquisition time.
If the samplelhold amplifier is required, the TRIGGER input
and 5tH CONTROL terminal can be tied together providing
only one conversion control signal. When the trigger pulse goes
high, it places the samplelbold amplifier in the sample mode
allowing it to acquire the present input signal. The trigger pulse
must remain high for a minimum of 5..,.sto insure accuracy. If
the samplelhold amplifier is not used, the trigger pulse needs to
be Iv-s (minimum) in length to satisfy the AID converter trigger
requirements. At the fa1.Lingdge of the trigger pulse, the sample!
e
hold amplifier is placed in the hold mode, all internal logic is
reset and the AID conversion begins. The conversion process
can be retriggc:red at any time, including duno, conversion.
OBS
laplat
IWIJe
Coan.ct
V1N S/H Out
or
To
ANA IN I,
ANA IN 2,
ANA IN 3
010 + SV
Ground
010 + IOV
5V
lOV
'NOCOlUlCC:lion
Connect
AnaJos Common
To
ANA IN 2
ANAIN3
ANA IN 1
ANAIN3
Ground
ANA IN J
Ground,
ANAIN3
Ground,
ANA IN 1
OLE
TE
CoaDect
ltefOuI
To
NC"
NC"
ANAIN2
ANA IN 2
Table
I. Analog Input Pin Programming
GAIN
ADJUST
With this negative edge of the trigger pulse, the MSB is set
high with the I"f'mainingdigital.outputs set to logic low state,
and the end of conversion is set high and remains high through
the full conversion cycle. During conversion each bit, starting
with the MSB, is sequentially switched high at the rising edge
of the internal clock. The DAC output is then compared to the
analog input and the bit decision is made. Each comparison
lasts onc clock cycle with the complete 14-/15./16-bit conversion
taking SOIoUl
maximum. At this time, the end of conversion line
goes low signjfying that the conversion is complete. For micro-
processor bus applications, the digital output can now be applied
to the data bus by enabling the tri-state buffers. For muimum
data throughpUt, the digital output data should be read while
the samplelhold amplifier is acquiring the new analog input
signal.
,
TAlGGfRi
SII4 COHTROl
I
,
,
CONNECT
I
I
I
,
REf OUT
.n
:
,
I
fOR
IJPOLAII
INl'UT
+fS
0fI£IIA
TION
ANAIH1
ANAIN Z
,..,IN S
SII4 OUTPUT
SIGNAL
0
--r
-FS -,'
I
L- ----
+fS
'4-111-111-
BIT
AIO
CONVEInaI
SIH OUTP\JT
-FS
0
E
-
~
-,
,
,
:
,
NOns
0
roc
---1--50... .!1x----
SlH IHI'UT
'AI
1. Output o.ta V.Iid.
SII4 CONTfIOl
Z. IfSlHContra' .nd Tri11'II'" -n.d T--.
M.
PuIM_1ft Mutt lie 5... Min'0 Allow,to.
SIH~
to Acquln _In,
Sign". If
tll. ADCia Only UMd. 1ft. Trig"" PuIM_t
lie 1". MIn.
Figure
2.
Analog Input Block Diagram
Figure
3.
DAS 1157/DAS 1158/DAS
1159
Timing Diagram
.J
ANALOGDEVICES FAX-ON-DEHAND HOTLINE
- Page 9
DAS1157IDAS1158IDAS1159
GAIN AND OFFSET ADJUSTMENT
The DASII 57/DAS1158/DAS1159 contain internal gain and
offset adjusanent potentiometers. Each potentiometer bas ample
adjustment range so that pin and offset errors can be trimmed
to zero.
Offset calibration is not affected by changes in pin calibration,
and should be performed prior to gain calibration. Proper gain
and offset calibration requires great care and the use of atremdy
The
sensitive and accurate reference instrUmCD.ts. voltage standard
used as a signal source must be very stable and be capable of
being set to within ~ l/lOLSB of the desired value at any point
within its range.
OFFSET CALIBRATION
For a 0 to + 10V unipolar range, set the input voltage precisely
to + 305fJ. for the DASllS7, + IS3fJ. for the DAS 1158 and
V
V
+ 76fJ.Vfor the DAS1l59. For a 0 to +5V unipolar range, set
the input to + 153fJ.V the DAS1l57, + 76fJ.Vfor the DAS1158
for
and + 38fJ.Vfor the DAS1159. Then adjust the zero potentiometer
until the converter is just on the verge of switching from
000
000 to 000
001 (DAS1157/DASI158) or from
100
000 to 100
001 (DAS1159).
For the ~ 5V bipolar range, set the input voltage precisely to
V
+ 305fJ. for the DAS1l57,
+
153fJ. for the DAS1l58 and
V
+ 76fJ.Vfor the DASIl59. For a ~ lOV bipolar range, set the
input voltage precisely to +610fJ.Y for the DASllS7, +305fJ.V
for the DAS1l58 and + 153fJ.Vfor the DAS1I59. Adjust the
zero potentiometer until the offset binary coded units are jUSt
on the verge of switching from 000
000 to 000
001
and the tWo'Scomplement coded units are just on the verge of
switching from 100
000 to 100
001.
Input Voltap
-
Output
Code Reiatiouhips
Unipolar Input Voltaaa
AAaloSlnput
Oto +SVRange Oto + 10VItaqe
DASI157
+4.99969V
+ 9. 99939V
+
O.OOOOOV
+ O.OOOOOV
Di,itat Output
Binary Code
II 1111 1111 1111
00 0000 0000 0000
Binary Code
III IIII 1111 1111
000 0000 0000 0000
Modified Binary Code
0111 1111 1111 1111
1000 0000 0000 0000
DAS1l58
+4.99985V
+O.OOOOOV
+9.99969V
+O.OOOOOV
DAS1l59
+4.99992V
+O.OOOOOV
+9.99985V
+ O.OOOOOV
OBS
~
Table II. Unipolar Input-Output Relationships
Bipolar"'pat voltaaa
AAaIoI "'put
DIptaJ 00njNt
Oft_IliauyCodo
II 1111
\III 1111
I0 0000 0000 0000
00 0000 0000 0000
T_'.c-pic-Cook
01
1111 1111IIJI
00 0000 0000 0000
I0 0000 0000 0000
GAIN CALIBRATION
Set the input voltage precisely to + 9.99909V (DAS1l57)1
+9.99954V
(DAS1l58)1
+ 9.99977V (DAS1159) for the 0 to
+ lOV units, +4.99954V (DASI157)/ +4.99977V (DASI158)1
+4.99989V (DAS1159) for 0 to + 5V units, +9.998l7V
(DAS 1157)/+ 9.99909V (DAS
11
58)1+
9. 99954V (DAS1159) for
OLE
TE
+9.9987&Y
+O.OOOOOY
- 10.OOOOOY
+ O.OOOOOY
- S.OOOOOY
" SV
DASIIS7
+4.99939Y
" ItV ........
DASI IS&
+4.99969V
+O.OOOOOY
- S.OOOOOY
+9.99939Y
+O.OOOOOY
-
10.OOOOOY
II I 1111 1111 I \II
I00 0000 0000 0000
000 0000 0000 0000
011 1111 1111 1111
000 0000 0000 0000
100 0000 0000 0000
DASIJS9
+4.99985Y
+O.OOOOOY
- S.OOOOOY
+'1.99969V
+O.OOOOOY
10.OOOOOY
-
0111 1111 1111 ]]11
0000 0000 0000 0000
I000 0000 0000 0000
Table III. Bipolar Input-Output Relationships
IOVunits, or + 4.99909V(DASl157)/+ 4.99954V(DASI158)/
TRI-STATE DIGITAL OUTPUT
The ADC digital outputs are provided in parallel format to the
output tri-state buffers. The output infonnation can be applied
to a data bus in either a one-byte or a tWo-byte format by using
the HIGH BYTE ENABLE and LOW BYTE ENABLE tenninals.
If the tn-state feature is not required, normal digital outputs
can be obtained by connecting the enable pins to ground.
POWER SUPPLY AND GROUNDING CONNECTIONS
No power supply decoupling is required since the DAS1l57/
DASI 158/DASI 159 contain high quality tantalum capacitors on
each of the power supply inputs to ground.
The analog and digital grounds are internally connected in the
DAS1l57/DAS1158/DAS1l59. But in many applications, an
external connection betWeen the digital ground pin and analog
ground pin is advisable for optimum performance.
STAR.1'OJfn" F
O
DIGITAL
,
OIlOUNOS
+4.99977V (DAS1l59) for ~5V units. Note that these values
are I 1/2LSBs less than nominal full scale. Adjust the gain
potentiometer until binary and offset binary coded unitS are just
on the verge of switching from 11
10 to 11
11 or modified
binary and tWo's complement coded units are just on the verge
of switching from 011
10 to 011
11.
DAS1157IDASnS8IDAS1159 INPUT/OUTPUT
RELATIONSIUPS
The DAS1l57IDAS1I58 produces a true binary coded output
when configured as a unipolar device. Configured as a bipolar
device, it can produce either offset binary or tWo's complement
outpUt codes. The most significant bit (MSB) is used to obtain
the binary and offset binary codes while (MSB) is used to obtain
two's complement coding. The DAS1159 produces a modified
binary coded output when configured as a unipolar device.
Configured as a bipolar device it can only produce two's com-
plement output codes. The DAS1159 uses MSB to obtain the
modified binary and two's complement output codes; the DASll59
duc~ not have an MSB output. Table II shows the DASllS7/
DAS1158/DAS1l59 unipolar analog input/digital output re-
lauonships. Table HI shows the DAS1l57/DAS1l581DAS1l59
btpolar analog input/digital outpUt relationships.
:.
,
STAR-POINT F
O
ANALOG
GIIOVNDS
DIGITAL
PO_II
SUPPl.V
COMMON
I DlGIT'IL
'IN.f.LOG
I GIIOVND
GROUND
I
I
I
I OAS11S7IOAS11581OA$1159I
I
I
"
)
ANAUXi
'OWER
SVt>l'l.Y
roMMO"
Figure
4.
Tvpical Ground Lavout for DAS1157/DAS1158/
DASl159
J
51mcu
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