ANALOGDEVICES fAX-ON-DEMAND HOTLINE
N
W
-
6
Page
ANALOG
DEVICES
LowPower14-B-it,15Bit & 16-Bit
SamplingAnalog-to-Digital
Converters
DAS1157 /DAS1158/DAS 1159
I
FEATURES
Complete with High Accuracy Semple/Hold and
AIDConverter
Low Power Conaumption: 850mW mu. v. = :t:15V
Rated Pedormence:
25"'<:to + BS"'<:
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.&35Modules
.., our
-
OBS
APPUCA T1ONS
Seismic Date Acquisition
Portable ReId Instrumentation
Automated Test Equipment
Proceu Control Date Acquisition
Medical Instrumentation
-
... 'N"'U
"NA~DO
'
...SO
"'$1
"""'T .
{.
TAl.
SU'E
IUFFE~S
DASllS7IDASl1S8IDASllS9 provide guaranteed high accuracy
and high stability system pcrfOrmaDCCessential to medical,
analytical and process control equipment: differential nonlinearity
of :O.OOIS% max and integral Donlincarity of :0.003% max
(DASllS8 and DASllS9); DOmissing codes guaranteed; pin
T.C. of :8ppmf'C max. zero T.C. of :80Jl.VIOC IOU and
differential nonlinearity T.C. of : IppmI"C max.
The wide dynamic range will enhancc the pcrfOrmaDCCof critical
mcuurc:mentS in au and liquid chromatography, blood aualyzcrs,
distributed data acquisitioD in factory automatioD and power
sencrating equipment, and in automatic test equipment.
I
(lIT
'" fL$&1
I,r 1 fOIl0""""
liT'
II'.
lIT.
IIr I
liT'
LO .NAllE
,$It< 'NPU'
liT .
liT.
IIr '.
S/H CONT.Ol
. ..v
lIT 11
liT t2
lIT "
lIT " 1LS8
lIT to ILS8
.SV
+'SV
OLE
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.
I
FUNCTIONAL BLOCK DIAGRAM
"N.&I.OG
"NO
"'NAlOG . OIGrr aNOS
AMO
..:~~~
!!!!".!!AlL:!
DAS"."
0"""..,
DIGITAL"""
-ISV
.",NuT
..-
"_ANAlOO
~O
II ullO"""
TE
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 componentS to achieve the highest level of pcrfOrmaDCCand reliability.
I
As shown in Figure 1, each device CODtainsa precision samplclhold
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.
~
ANALOGDEVICES fAX-ON-DEMAND HOTLINE
- Page 7
DAS1157
/DAS1158/DAS1159
-SPECIFICATIONS
(typical
@ +25°C,Vs= ::t15V,Yo= +5Y unless otherwise specified)
~
158i..
RESOLUTION
~57
148111
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
18kHzmin
SO""......
S".mu
2SOn,
I..
-9Od8min
O,DS,.VI,.,.O.I"VI",.mu
: 0,005%oflnpuIVoltagcChani<
MODEL
~S9
1681..
,~CCt:RACY
10'CiI"'1 Noohnearuy'
DIII.reoti,1 Nonhnan,y'
NoMIS,ingCod'"
:JO'Noi..,SiHplu'ND\
:3<YNOIse(NDJ
r""""""""""""
~I
:0,003% FSR'"""
"O.OOI~%FSR'mul
:0 005% FSR'mu
= D.OOJ% FSR'maa
Guarante<d
DIGITAL INPUTS
AiD Trill«..'
lope Level'
SIHConllol
Low Enable. High Enabl.'
...
",
...
'"
"'
OUlpul Dri.e
POWER REQUIREMENTS
Rated Voltaps
Ope..u..
Voltavcs'"
SupplyCortenlDrain
'" ISV
+5V
To<alpo...,('_..mp,Ion.
Ys.
"'- ISV
TEMPERATURE
RANGE
RI,ed P.rformance
dV. :: JOV
010+SV.O,o+10V
UkH
S1<O
10k/J
IOOMO!5pl"
.
;
.u
,J .f++-;~~
'
,
i:j:
::t:
I
'M
~~'
'°..,""" ,
::..."':]
" 0""
';";..;..j
-iI-""""'*'
;'
!
ASSIUO1.Y INSI'aUCJ1ONS
OLE
+ IOV, ,,0,3%
ZmA......
::::::
..",",
, """""
c+',
T
,
CAtmON:
Thia
- ~.-IoG.
modWe
ia
- aDaraIJeddod
.-mbIy
azo4II
Do- aubic<
10. ",,-, .. --1rIIb
- -.Id
d.izecz
00III8CI
.nmfiwliqllida
or
npon. ED
,. of""'may"""". ~
poriormaDot ~
.., -
SeeNo.. 7
SeeN"'e 7
:ISV(:o:3%},+5V(:S%)
"'-lZVto:!: 17V, .4.75Vto + S.2SV
:!:15mA
IOmA
SOOmWtyp,6SOmWmu
-
ODd
~,
WoaII aI\Iot
ODd
- 0GIy
ttpOt
doaabybuod.
TE
-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
Oper..,..
5'°""
llel..ivcHumidiry
Shielding
SIZE
NOTES
'S"",."."
OASIII7
"s""'"""""""'"
OASII5a
'M_.m! ,. 0<>44 I.p'" lOVpk." (" 'OkH..
',",""'-UM ,.nun.- 0/ SIHUIdAiD_Io_ity ,non.
'FSR
FuJIS<ak""""
'[);ff"""..,"'
"""...~-...
"'" ""
coo
"".....
, ""."".."..,
,...""", ,
"'-"""""""."",""'"
8inary
Off... BillllY, 2', Complemen,
2TIL Looa,
U>gic"I" DurinJCon..nion
2TIL Looa.
INTERNAL REFERE."ICE VOLTAGE
E..emal Looa Cor"",' (R.ud Pfflormln<t)
~,:~:~
t, t, 4-;-++i ....
N'
01'
Politi.. Pulse, Ncg, Ed.. Tri".rcd
SVCMOSeompatible
SAMPLE. Logi. I. TIL Compatible
ENABLE- l.os1cO. CMOSrrrt. Compatible I-
DIGITAL OUTPUTS
P,rallel Data 0011'0"
Unipolar
8ipow
OUlPOI Dri..
EndoCConvenion
'_o..~
..II'
= Ippmi"Cmu
OBS
S;H Inpu,lmpcdanco
00'.""".',,"'0_'
IT~""..~T
"" .......
:.-.1
c
-::+
ANALOGIN'I'UT
Voltage Rani<
8ipolar
Unipolar'
IlDe Inpul Impe<J&nce Qto + ~V
0,o+IDV.=5V
",-IOV
L
1!jL':""
:: lppmf'Cmu
:0:8ppmf'Cmu
:3Oi;Y,'Ctyp, "'-SO...VI"Cmax
:O.O~%I"C
:O,OOI%FSR'!%V.
I._lhen I Minu,e
T.c.
:.::},::O::
-II
...",.......'
..
0,0022%!>,p(7~",V
rm,)
0.OOI5%!>,p(SO...Vrm.)
STABILITY
D,ICerential Nonlinearity
Ga,nT.C,
ZeroT,C,
Conver..onTimcT,C,
Po",er Supply Senslti..ty
Warm.Up Time
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm),
my,. ... 0,. . IV,
-
~'
-!..ow
By"
E- ... ,
InB..a,-
(MS
\---~
only.1MMSBm... b<in
_.
loc
II,H-
By,e£
pi.
... MSB.Msa.. Bi,16...
ai" 2,""'" 1.
'OAStaO...,.."" 'odBoo
;,
,.. IIIOdifn
""'" f
II
oO.OOJ'"
.yp""fa<'.. OAS1I51.
OASta
OM"'o,
"""". ""'_"0' ,heT~ ... ,...SIH""""" ...........
0_""'. ""...be ."". Oft."be"",,C
51H
""p""" ..",qu,...heinpu.
'",he..."""
,.(""
moo'.It '0, ,<,,0"'.,.."", ooIy" uood,,...T"- ".J.. 'Old..
,
b<I., mm,... F
J},
'_,"'51H
,
'"","_.
ole """
_Ii..,......,.-.-,..-V",..,,
V" .I2Vdt
-7V).
'1l
s"..,r~t
"""""..
""'" "
" .10...
,
'
w """" 5"""1' A.wo, Doviots"041' 92J,
.. ,"'-
..,..,..
~
ANALOGDEVICES FAX-ON-DEMANDHOTLINE
-
B
Page
[
Applyingthe DAS1157/DAS1158/DAS1159
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-ENABLElLOENABLE 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 converter, apply the analog input to the SIH INPUT terminal and
connect the SIH OUTPUT terminal to the appropriate AID
converter analog input.
OBS
Coan.ct
V1Nor S/H Out
To
Ana1o&Voitap
laplat
IWIJe
010 + SV
Ground
ANA IN 2
ANAIN3
Ground
ANA IN J
5V
ANA IN 1
Ground,
ANAIN3
lOV
ANAIN3
Ground,
ANA IN 1
010 + IOV
'NOCOlUlCC:lion
Table
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.Ling
edge of the trigger pulse, the sample!
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.
OLE
Connect
AnaJos Common
To
ANA IN I,
ANA IN 2,
ANA IN 3
Errors due to source loading are eliminated since the samplClhold
amplifier is a high-impedance unity-gain amplifier. High feedthrough 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.
I. Analog Input Pin Programming
CoaDect
ltefOuI
To
NC"
NC"
ANAIN2
ANA IN 2
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 microprocessor 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.
TE
I
,
,,
I CONNECT
I
I
:,
I
REf OUT
,
TAlGGfRi
SII4 COHTROl
INl'UT
fOR
IJPOLAII
0fI£IIATION
L- ----
GAIN
ADJUST
SIGNAL
ANAIH1
'4-111-111BIT
AIO
CONVEInaI
SIH OUTP\JT -FS
0
Figure 2. Analog Input Block Diagram
:
,
NOns
'AI 1. Output o.ta V.Iid.
0
SII4 CONTfIOl
-,
roc---1--50... .!1x----
SII4 OUTPUT
SlH IHI'UT
E
~-
,,
0 --r
-FS
-,' I
+fS
ANAIN Z
,..,IN S
+fS
.n
Z. IfSlHContra' .nd Tri11'II'"
M. -n.d T--.
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 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
sensitive and accurate reference instrUmCD.ts.The 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.V for the DASllS7, + IS3fJ.V for the DAS 1158 and
+ 76fJ.Vfor the DAS1l59. For a 0 to +5V unipolar range, set
the input to + 153fJ.Vfor the DAS1l57, + 76fJ.Vfor the DAS1158
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).
OBS
Input Voltap
- Output
Code Reiatiouhips
Unipolar Input Voltaaa
AAaloSlnput
Oto +SVRange Oto + 10VItaqe
DASI157
+4.99969V
+ 9. 99939V
+ O.OOOOOV
+ O.OOOOOV
DAS1l58
+4.99985V
+9.99969V
+O.OOOOOV
+O.OOOOOV
DAS1l59
+4.99992V
+9.99985V
+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
Table II. Unipolar Input-Output Relationships
Bipolar"'pat voltaaa
AAaIoI "'put
DIptaJ 00njNt
" SV
DASIIS7
+4.99939Y
" ItV ........
+ O.OOOOOY
+O.OOOOOY
- S.OOOOOY
- 10.OOOOOY
Oft_IliauyCodo
T_'.c-pic-Cook
OLE
For the ~ 5V bipolar range, set the input voltage precisely to
+ 305fJ.V for the DAS1l57, + 153fJ.V for the DAS1l58 and
+ 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.
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 1158)1+ 9. 99954V (DAS1159) for
~
IOVunits, or + 4.99909V(DASl157)/+ 4.99954V(DASI158)/
+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 complement 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 relauonships. Table HI shows the DAS1l57/DAS1l581DAS1l59
btpolar analog input/digital outpUt relationships.
+9.9987&Y
DASI IS&
+4.99969V
+9.99939Y
+O.OOOOOY
+O.OOOOOY
- S.OOOOOY
-
DASIJS9
+4.99985Y
+'1.99969V
10.OOOOOY
+O.OOOOOY
+O.OOOOOY
- S.OOOOOY
-
10.OOOOOY
II 1111 \III 1111
I0 0000 0000 0000
00 0000 0000 0000
01 1111 1111IIJI
00 0000 0000 0000
I0 0000 0000 0000
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
TE
0111 1111 1111 ]]11
0000 0000 0000 0000
I000 0000 0000 0000
Table III. Bipolar Input-Output Relationships
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"OF
DIGITAL
, OIlOUNOS
:.
DIGITAL
PO_II
SUPPl.V
COMMON
,
I DlGIT'IL
'IN.f.LOG
I GIIOVND
GROUND
I
I
I
I OAS11S7IOAS11581OA$1159I
I
I
"
)
STAR-POINT
OF
ANALOGGIIOVNDS
ANAUXi
'OWER
SVt>l'l.Y
roMMO"
Figure 4. Tvpical Ground Lavout for DAS1157/DAS1158/
DASl159
J