Ultra-Small, Low-Power, 16-Bit ADC with Internal Reference

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ADS1115 ADS1113
ADS1115 ADS1114
ADS1115
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Ultra-Small, Low-Power, 16-Bit
Analog-to-Digital Converter with Internal Reference
CheckforSamples:ADS1113ADS1114ADS1115
FEATURES DESCRIPTION
1
• ULTRA-SMALLQFN PACKAGE: The ADS1113, ADS1114, and ADS1115 are
23
2mm×1,5mm × 0,4mm precision analog-to-digital converters (ADCs) with 16
• WIDESUPPLY RANGE:2.0Vto5.5V bits of resolution offered in an ultra-small, leadless
QFN-10 package or an MSOP-10 package. The
• LOWCURRENT CONSUMPTION:
ADS1113/4/5aredesignedwithprecision, power, and
ContinuousMode:Only150μA
ease of implementation in mind. The ADS1113/4/5
Single-Shot Mode:Auto Shut-Down
feature an onboard reference and oscillator. Data are
• PROGRAMMABLEDATARATE: transferred via an I2C-compatible serial interface; four
8SPSto860SPS I2C slave addresses can be selected. The
ADS1113/4/5 operate from a single power supply
• INTERNALLOW-DRIFT
rangingfrom2.0Vto5.5V.
VOLTAGEREFERENCE
• INTERNALOSCILLATOR The ADS1113/4/5 can perform conversions at rates
up to 860 samples per second (SPS). An onboard
• INTERNALPGA
PGA is available on the ADS1114 and ADS1115 that
• I2C™INTERFACE:Pin-SelectableAddresses offers input ranges from the supply to as low as
• FOURSINGLE-ENDEDORTWO ±256mV, allowing both large and small signals to be
DIFFERENTIALINPUTS(ADS1115) measured with high resolution. The ADS1115 also
features an input multiplexer (MUX) that provides two
• PROGRAMMABLECOMPARATOR
differentialorfour single-endedinputs.
(ADS1114and ADS1115)
The ADS1113/4/5 operate either in continuous
APPLICATIONS conversion mode or a single-shot mode that
automatically powers down after a conversion and
• PORTABLEINSTRUMENTATION
greatly reduces current consumption during idle
• CONSUMERGOODS
periods. The ADS1113/4/5 are specified from –40°C
• BATTERYMONITORING to+125°C.
• TEMPERATURE MEASUREMENT
• FACTORYAUTOMATIONANDPROCESS
CONTROLS
VDD VDD
Voltage ADS1113 AADDSS11111154 Voltage Comparator
Reference Reference ALERT/RDY
AIN0
AIN0 ADDR AIN1 ADDR
AIN1 16A-BDitCDS InteI2rCface SCL AAIINN23 MUX PGA 16A-BDitCDS InteI2rCface SCL
SDA ADS1115 SDA
Only
Oscillator Oscillator
GND GND
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas
Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
I2CisatrademarkofNXPSemiconductors.
2
Allothertrademarksarethepropertyoftheirrespectiveowners.
3
PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2009,TexasInstrumentsIncorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarilyincludetestingofallparameters.
ADS1113
ADS1114
ADS1115
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This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore
susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this
document,orseetheTI websiteatwww.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
ADS1113,ADS1114,ADS1115 UNIT
VDDtoGND –0.3to+5.5 V
Analoginputcurrent 100,momentary mA
Analoginputcurrent 10,continuous mA
AnaloginputvoltagetoGND –0.3toVDD+0.3 V
SDA,SCL,ADDR,ALERT/RDYvoltagetoGND –0.5to+5.5 V
Maximumjunctiontemperature +150 °C
Storagetemperaturerange –60to+150 °C
(1) StressesabovethoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Exposuretoabsolute
maximumconditionsforextendedperiodsmayaffectdevicereliability.
PRODUCTFAMILY
PACKAGE INPUTCHANNELS
DESIGNATOR RESOLUTION MAXIMUMSAMPLE (Differential/
DEVICE MSOP/QFN (Bits) RATE(SPS) COMPARATOR PGA Single-Ended)
ADS1113 BROI/N6J 16 860 No No 1/1
ADS1114 BRNI/N5J 16 860 Yes Yes 1/1
ADS1115 BOGI/N4J 16 860 Yes Yes 2/4
ADS1013 BRMI/N9J 12 3300 No No 1/1
ADS1014 BRQI/N8J 12 3300 Yes Yes 1/1
ADS1015 BRPI/N7J 12 3300 Yes Yes 2/4
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ELECTRICAL CHARACTERISTICS
Allspecificationsat–40°Cto+125°C,VDD=3.3V,andFull-Scale(FS)=±2.048V,unlessotherwisenoted.
Typicalvaluesareat+25°C.
ADS1113,ADS1114,ADS1115
PARAMETER TESTCONDITIONS MIN TYP MAX UNIT
ANALOGINPUT
Full-scaleinputvoltage(1) V =(AIN )–(AIN ) ±4.096/PGA V
IN P N
Analoginputvoltage AIN orAIN toGND GND VDD V
P N
Differentialinputimpedance SeeTable2
FS=±6.144V(1) 10 MΩ
FS=±4.096V(1),±2.048V 6 MΩ
Common-modeinputimpedance
FS=±1.024V 3 MΩ
FS=±0.512V,±0.256V 100 MΩ
SYSTEMPERFORMANCE
Resolution Nomissingcodes 16 Bits
8,16,32,
64,128,
Datarate(DR) SPS
250,475,
860
Dataratevariation Alldatarates –10 10 %
Outputnoise SeeTypicalCharacteristics
Integralnonlinearity DR=8SPS,FS=±2.048V,bestfit(2) 1 LSB
FS=±2.048V,differentialinputs ±1 ±3 LSB
Offseterror
FS=±2.048V,single-endedinputs ±3 LSB
Offsetdrift FS=±2.048V 0.005 LSB/°C
Offsetpower-supplyrejection FS=±2.048V 1 LSB/V
Gainerror(3) FS=±2.048Vat25°C 0.01 0.15 %
FS=±0.256V 7 ppm/°C
Gaindrift(3) FS=±2.048V 5 40 ppm/°C
FS=±6.144V(1) 5 ppm/°C
Gainpower-supplyrejection 80 ppm/V
PGAgainmatch(3) MatchbetweenanytwoPGAgains 0.02 0.1 %
Gainmatch Matchbetweenanytwoinputs 0.05 0.1 %
Offsetmatch Matchbetweenanytwoinputs 3 LSB
AtdcandFS=±0.256V 105 dB
AtdcandFS=±2.048V 100 dB
Common-moderejection AtdcandFS=±6.144V(1) 90 dB
f =60Hz,DR=8SPS 105 dB
CM
f =50Hz,DR=8SPS 105 dB
CM
DIGITALINPUT/OUTPUT
Logiclevel
V 0.7VDD 5.5 V
IH
V GND–0.5 0.3VDD V
IL
V I =3mA GND 0.15 0.4 V
OL OL
Inputleakage
I V =5.5V 10 μA
H IH
I V =GND 10 μA
L IL
(1) Thisparameterexpressesthefull-scalerangeoftheADCscaling.InnoeventshouldmorethanVDD+0.3Vbeappliedtothisdevice.
(2) 99%offull-scale.
(3) IncludesallerrorsfromonboardPGAandreference.
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ELECTRICAL CHARACTERISTICS (continued)
Allspecificationsat–40°Cto+125°C,VDD=3.3V,andFull-Scale(FS)=±2.048V,unlessotherwisenoted.
Typicalvaluesareat+25°C.
ADS1113,ADS1114,ADS1115
PARAMETER TESTCONDITIONS MIN TYP MAX UNIT
POWER-SUPPLYREQUIREMENTS
Power-supplyvoltage 2 5.5 V
Power-downcurrentat25°C 0.5 2 μA
Power-downcurrentupto125°C 5 μA
Supplycurrent
Operatingcurrentat25°C 150 200 μA
Operatingcurrentupto125°C 300 μA
VDD=5.0V 0.9 mW
Powerdissipation VDD=3.3V 0.5 mW
VDD=2.0V 0.3 mW
TEMPERATURE
Storagetemperature –60 +150 °C
Specifiedtemperature –40 +125 °C
PIN CONFIGURATIONS
RUG PACKAGE
QFN-10 DGS PACKAGE
(TOP VIEW) MSOP-10
SCL (TOP VIEW)
10
ADDR 1 10 SCL
ADDR 1 9 SDA
ALERT/RDY(ADS1114/5 Only) 2 9 SDA
ALERT/RDY (ADS1114/5 Only) 2 ADS1113 8 VDD ADS1113
ADS1114 GND 3 ADS1114 8 VDD
GND 3 ADS1115 7 AIN3(ADS1115 Only) ADS1115
AIN0 4 7 AIN3(ADS1115 Only)
AIN0 4 6 AIN2(ADS1115 Only)
AIN1 5 6 AIN2(ADS1115 Only)
5
AIN1
PINDESCRIPTIONS
DEVICE ANALOG/
DIGITAL
INPUT/
PIN# ADS1113 ADS1114 ADS1115 OUTPUT DESCRIPTION
1 ADDR ADDR ADDR DigitalInput I2Cslaveaddressselect
2 NC(1) ALERT/RDY ALERT/RDY DigitalOutput Digitalcomparatoroutputorconversionready(NCforADS1113)
3 GND GND GND Analog Ground
4 AIN0 AIN0 AIN0 AnalogInput Differentialchannel1:Positiveinputorsingle-endedchannel1input
5 AIN1 AIN1 AIN1 AnalogInput Differentialchannel1:Negativeinputorsingle-endedchannel2input
6 NC NC AIN2 AnalogInput Differentialchannel2:Positiveinputorsingle-endedchannel3input(NCforADS1113/4)
Differentialchannel2:Negativeinputorsingle-endedchannel4input
7 NC NC AIN3 AnalogInput
(NCforADS1113/4)
8 VDD VDD VDD Analog Powersupply:2.0Vto5.5V
9 SDA SDA SDA DigitalI/O Serialdata:Transmitsandreceivesdata
10 SCL SCL SCL DigitalInput Serialclockinput:ClocksdataonSDA
(1) NCpinsmaybeleftfloatingortiedtoground.
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TIMING REQUIREMENTS
t
LOW t t t
R F HDSTA
SCL
tHDSTA tHIGH tSUSTA tSUSTO
t t
HDDAT SUDAT
SDA
t
BUF
P S S P
Figure1. I2CTimingDiagram
Table1.I2CTimingDefinitions
FASTMODE HIGH-SPEEDMODE
PARAMETER MIN MAX MIN MAX UNIT
SCLoperatingfrequency f 0.01 0.4 0.01 3.4 MHz
SCL
BusfreetimebetweenSTARTandSTOP
t 600 160 ns
condition BUF
HoldtimeafterrepeatedSTARTcondition.
t 600 160 ns
Afterthisperiod,thefirstclockisgenerated. HDSTA
RepeatedSTARTconditionsetuptime t 600 160 ns
SUSTA
Stopconditionsetuptime t 600 160 ns
SUSTO
Dataholdtime t 0 0 ns
HDDAT
Datasetuptime t 100 10 ns
SUDAT
SCLclocklowperiod t 1300 160 ns
LOW
SCLclockhighperiod t 600 60 ns
HIGH
Clock/datafalltime t 300 160 ns
F
Clock/datarisetime t 300 160 ns
R
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TYPICAL CHARACTERISTICS
AtT =+25°CandVDD=3.3V,unlessotherwisenoted.
A
OPERATINGCURRENTvsTEMPERATURE SHUTDOWNCURRENTvsTEMPERATURE
300 5.0
4.5
250
4.0
A) VDD= 5V A)
m m 3.5
ent ( 200 ent ( 3.0
Curr 150 Curr 2.5
g VDD= 3.3V n
Operatin 100 VDD= 2V Shutdow 21..05 VDD= 3.3V VDD= 5V
1.0
50
0.5
VDD= 2V
0 0
-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140
Temperature (°C) Temperature (°C)
Figure2. Figure3.
SINGLE-ENDEDOFFSETERRORvsTEMPERATURE(1) DIFFERENTIALOFFSETvsTEMPERATURE
150 60
FS =±4.096V(1) FS =±1.024V
100 50
FS =±2.048V FS =±0.512V
VDD= 5V
50
40
V) 0 VDD = 2V mV)
Error (m -50 oltage ( 3200 VDD= 4V
Offset --110500 Offset V 10 VDD= 3V
0
-200 VDD= 2V
VDD = 5V
-250 -10
-300 -20
-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140
Temperature (°C) Temperature (°C)
Figure4. Figure5.
GAINERRORvsTEMPERATURE GAINERRORvsSUPPLY
0.05 0.15
FS =±0.256V
0.04
0.10
0.03
FS =±0.512V
%) 0.02 %) 0.05 FS =±256mV
or ( 0.01 or (
ain Err 0 ±4F.S0 9=6±V1(1.)0, 2a4nVd,±±62..104448VV,(1) ain Err 0 FS =±2.048V
G -0.01 G -0.05
-0.02
-0.10
-0.03
-0.04 -0.15
-40 -20 0 20 40 60 80 100 120 140 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Temperature (°C) Supply Voltage (V)
Figure6. Figure7.
(1) Thisparameterexpressesthefull-scalerangeoftheADCscaling.InnoeventshouldmorethanVDD+0.3Vbeappliedtothisdevice.
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TYPICAL CHARACTERISTICS (continued)
AtT =+25°CandVDD=3.3V,unlessotherwisenoted.
A
INLvsSUPPLYVOLTAGE(2) INLvsINPUTSIGNAL
60 60
FS =±2.048V
VDD = 3.3V
50 40
DR = 8SPS
mV) mV) Best Fit +125°C
y ( 40 y ( 20
earit FS =±6.144V(1) earit -40°C
n n
nli 30 nli 0
al No 20 FS =±2.048V FS =±0.512,±0.256V al No -20
gr gr
e e +25°C
nt nt
I 10 I -40
0 -60
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0
Supply Voltage (V) Input Signal (V)
Figure8. Figure9.
INLvsINPUTSIGNAL INLvsINPUTSIGNAL
60 60
FS =±0.512V FS =±2.048V
VDD = 3.3V VDD = 5V
mV) 40 DBeRs =t F 8itSPS +125°C mV) 40 DBeRs =t F 8itSPS
y ( 20 y ( 20
arit -40°C arit TA=-40°C
e e
n n
nli 0 nli 0
o o
al N -20 +25°C al N -20 TA= +125°C TA= +25°C
gr gr
e e
nt nt
I -40 I -40
-60 -60
-0.5 -0.375-0.250-0.125 0 0.125 0.250 0.375 0.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0
Input Signal (V) Input Voltage (V)
Figure10. Figure11.
INLvsINPUTSIGNAL INLvsTEMPERATURE
60 140
FS =±0.512V DR = 8SPS
VDD = 5V
40 DR = 8SPS 120
mearity (V) 20 Best FitTA=-40°C TA= +25°C mearity (V) 10800
nlin 0 nlin VDD= 2V
al No -20 TA= +125°C al No 60 VDD= 5V
egr egr 40
nt nt
I -40 I
20
VDD= 3.3V
-60 0
-0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -60 -40 -20 0 20 40 60 80 100 120 140
Input Voltage (V) Temperature (°C)
Figure12. Figure13.
(2) Thisparameterexpressesthefull-scalerangeoftheADCscaling.InnoeventshouldmorethanVDD+0.3Vbeappliedtothisdevice.
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TYPICAL CHARACTERISTICS (continued)
AtT =+25°CandVDD=3.3V,unlessotherwisenoted.
A
NOISEvsINPUTSIGNAL NOISEvsSUPPLYVOLTAGE
12 35
FS =±0.512V
FS =±2.048V
10 30
860SPS
25
V) 8 V)
m DR = 860SPS m
S Noise ( 6 DR = 128SPS S Noise ( 2105
RM 4 DR = 8SPS RM 10 128SPS
2
5
8SPS
0 0
-0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V) Supply Voltage(V)
Figure14. Figure15.
NOISEvsTEMPERATURE GAINERRORHISTOGRAM
10 30
185 Units From a Production Lot
9 FS =±2.048V
25
8
s
e
V) 7 enc 20
e (m 6 curr
ois 5 Oc 15
MS N 4 er of
R 3 mb 10
u
N
2 5
FS =±2.048V
1
Data Rate = 8SPS
0 0
-40 -20 0 20 40 60 80 100 120 140 050505050505050505050
10 011223344556677889
00 000000000000000000
Temperature (°C) 0.0. 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.
--
Gain Error (%)
Figure16. Figure17.
OFFSETHISTOGRAM TOTALERRORvsINPUTSIGNAL
160 4
185 Units From a Includes noise, offset, and gain error.
140 Production Lot 3
FS =±2.048V
es 120 2
c
mber of Occurren 1086000 Total Error (mV) -101
Nu 40 -2
FS =±2.048V
20 -3 Data Rate = 860SPS
Differential Inputs
0 -4
-3 -2 -1 0 1 2 3 -2.048 -1.024 0 1.024 2.048
Offset (LSBs) Input Signal (V)
Figure18. Figure19.
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TYPICAL CHARACTERISTICS (continued)
AtT =+25°CandVDD=3.3V,unlessotherwisenoted.
A
DATARATEvsTEMPERATURE FREQUENCYRESPONSE
4 0
Data Rate = 8SPS
3 -10
VDD= 5V
2 -20
%)
e Error ( 10 VDD= 3.3V n (dB) --3400
at ai
a R -1 G -50
at
D -2 -60
VDD= 2V
-3 -70
-4 -80
-40 -20 0 20 40 60 80 100 120 140 1 10 100 1k 10k
Temperature (°C) Input Frequency (Hz)
Figure20. Figure21.
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OVERVIEW
of a differential, switched-capacitor ΔΣ modulator
The ADS1113/4/5 are very small, low-power, 16-bit,
followed by a digital filter. Input signals are compared
delta-sigma (ΔΣ) analog-to-digital converters (ADCs).
to the internal voltage reference. The digital filter
The ADS1113/4/5 are extremely easy to configure
receives a high-speed bitstream from the modulator
and design into a wide variety of applications, and
andoutputsacodeproportionaltotheinputvoltage.
allow precise measurements to be obtained with very
little effort. Both experienced and novice users of The ADS1113/4/5 have two available conversion
data converters find designing with the ADS1113/4/5 modes: single-shot mode and continuous conversion
familytobeintuitiveandproblem-free. mode. In single-shot mode, the ADC performs one
conversion of the input signal upon request and
The ADS1113/4/5 consist of a ΔΣ analog-to-digital
stores the value to an internal result register. The
(A/D) core with adjustable gain (excludes the
device then enters a low-power shutdown mode. This
ADS1113), an internal voltage reference, a clock
mode is intended to provide significant power savings
oscillator, and an I2C interface. An additional feature
in systems that only require periodic conversions or
availableontheADS1114/5isaprogrammabledigital
when there are long idle periods between
comparator that provides an alert on a dedicated pin.
conversions. In continuous conversion mode, the
All of these features are intended to reduce required
ADC automatically begins a conversion of the input
external circuitry and improve performance. Figure 22
signal as soon as the previous conversion is
showstheADS1115functionalblockdiagram.
completed. The rate of continuous conversion is
The ADS1113/4/5 A/D core measures a differential equal to the programmed data rate. Data can be read
signal, V , that is the difference of AIN and AIN . A at any time and always reflect the most recent
IN P N
MUX is available on the ADS1115. This architecture completedconversion.
results in a very strong attenuation in any
common-mode signals. The converter core consists
VDD
ADS1115
Comparator
Voltage
MUX Reference ALERT/RDY
Gain = 2/3,1,
AIN0
2, 4, 8, or 16
ADDR
AIN1 PGA 16-BitDS I2C SCL
ADC Interface
SDA
AIN2
Oscillator
AIN3
GND
Figure22. ADS1115Functional BlockDiagram
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