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ADS1118 PDF资料 ,可以用于测量电压,内部含有可编程增益放大器,灵活使用于各种电压测量场合
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SPI
Interface
Oscillator
Voltage
Reference
High Accuracy
Temp Sensor
MUX
PGA
16-bit Ȉǻ
ADC
GND
2V
500ȍ
500ȍ
0.1 F
1 F
0.1 F
GND
1Mȍ
1Mȍ
GND
2V
500ȍ
500ȍ
1 F
0.1 F
GND
1Mȍ
GND
2V
0.1 F
0.1 F
GND
AIN0
AIN1
AIN2
AIN3
SCLK
CS
VDD
GND
DOUT/DRDY
DIN
ADS1118
1Mȍ
GND
GND
ADS1118
www.ti.com
SBAS457A –OCTOBER 2010–REVISED JULY 2011
Ultra-Small, Low-Power, SPI™-Compatible, 16-Bit
Analog-to-Digital Converter and Temperature Sensor with Internal Reference
Check for Samples: ADS1118
1
FEATURES
DESCRIPTION
The ADS1118 is a precision analog-to-digital
23
• Ultra-Small QFN Package:
converter (ADC) with 16 bits of resolution offered in
2mm × 1,5mm × 0,4mm
an ultra-small, leadless QFN-10 package or an
• Wide Supply Range: 2.0V to 5.5V
MSOP-10 package. The ADS1118 is designed with
• Low Current Consumption:
precision, power, and ease of implementation in
– Continuous Mode: Only 150μA
mind. The ADS1118 features an onboard reference
and oscillator. Data are transferred via a serial
– Single-Shot Mode: Auto Shutdown
peripheral interface (SPI). The ADS1118 operates
• Programmable Data Rate:
from a single power supply ranging from 2V to 5.5V.
8SPS to 860SPS
• Single-Cycle Settling
The ADS1118 can perform conversions at rates up to
860 samples per second (SPS). An onboard
• Internal Low-Drift Voltage Reference
programmable gain amplifier (PGA) is available on
• Internal Temperature Sensor:
the ADS1118 that offers input ranges from the supply
– 0.5°C Max Error
to as low as ±256mV. This range allows both large
• Internal Oscillator
and small signals to be measured with high
resolution. The ADS1118 also features an input
• Internal PGA
multiplexer (MUX) that provides two differential or
• Four Single-Ended or Two Differential Inputs
four single-ended inputs. The ADS1118 can also
function as a high-accuracy temperature sensor. This
APPLICATIONS
temperature sensor can be used for system-level
• Temperature Measurement:
temperature monitoring or cold junction compensation
for thermocouples.
– Thermocouple Measurement
– Cold Junction Compensation
The ADS1118 operates either in continuous
– Thermistor Measurement
conversion mode or a single-shot mode that
automatically powers down after a conversion.
• Portable Instrumentation
Single-shot mode significantly reduces current
• Factory Automation and Process Controls
consumption during idle periods. The ADS1118 is
specified from –40°C to +125°C.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2SPI is a trademark of Motorola.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2010–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
ADS1118
SBAS457A –OCTOBER 2010– REVISED JULY 2011
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this
document, or visit the device product folder on www.ti.com.
ABSOLUTE MAXIMUM RATINGS
(1)
ADS1118 UNIT
VDD to GND –0.3 to +5.5 V
Analog input current 100, momentary mA
Analog input current 10, continuous mA
Analog input voltage to GND –0.3 to VDD + 0.3 V
DIN, DOUT/DRDY, SCLK, CS voltage to GND –0.3 to +5.5 V
Human body model (HBM)
±4000 V
JEDEC standard 22, test method A114-C.01, all pins
ESD ratings
Charged device model (CDM)
±1000 V
JEDEC standard 22, test method C101, all pins
Operating temperature range –40 to +125 °C
Maximum junction temperature +150 °C
Storage temperature range –60 to +150 °C
(1) Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to absolute
maximum conditions for extended periods may affect device reliability.
PRODUCT FAMILY
INPUT CHANNELS
RESOLUTION MAXIMUM SAMPLE SPECIAL (Differential/
DEVICE (Bits) RATE (SPS) FEATURES PGA INTERFACE Single-Ended)
ADS1118 16 860 Temperature sensor Yes SPI 2/4
ADS1018 12 3300 Temperature sensor Yes SPI 2/4
ADS1115 16 860 Comparator Yes I
2
C 2/4
ADS1114 16 860 Comparator Yes I
2
C 1/1
ADS1113 16 860 None No I
2
C 1/1
ADS1015 12 3300 Comparator Yes I
2
C 2/4
ADS1014 12 3300 Comparator Yes I
2
C 1/1
ADS1013 12 3300 None No I
2
C 1/1
2 Copyright © 2010–2011, Texas Instruments Incorporated
ADS1118
www.ti.com
SBAS457A –OCTOBER 2010–REVISED JULY 2011
ELECTRICAL CHARACTERISTICS
Maximum/minimum specifications at –40°C to +125°C, VDD = 3.3V, data rate = 8SPS, and full-scale (FS) = ±2.048V, unless
otherwise noted. Typical values are at +25°C, VDD = 3.3V, data rate = 8SPS, and full-scale (FS) = ±2.048V, unless otherwise
noted.
ADS1118
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUT
Full-scale input voltage
(1)
V
IN
= (AIN
P
) – (AIN
N
) ±4.096/PGA V
Analog input voltage AIN
P
or AIN
N
to GND GND VDD V
Differential input impedance See Table 1
FS = ±6.144V
(1)
8 MΩ
FS = ±4.096V
(1)
, ±2.048V 6 MΩ
Common-mode input impedance
FS = ±1.024V 3 MΩ
FS = ±0.512V, ±0.256V 100 MΩ
SYSTEM PERFORMANCE
Resolution No missing codes 16 Bits
Data rate (DR) 8, 16, 32, 64, 128, 250, 475, 860 SPS
Data rate variation All data rates –10 10 %
Output noise See Typical Characteristics
Integral nonlinearity DR = 8SPS, FS = ±2.048V, best fit
(2)
1 LSB
FS = ±2.048V, differential inputs ±0.1 ±2 LSB
Offset error
FS = ±2.048V, single-ended inputs ±0.25 LSB
Offset drift FS = ±2.048V 0.002 LSB/°C
Offset power-supply rejection FS = ±2.048V, with dc supply variation 0.2 LSB/V
Gain error
(3)
FS = ±2.048V at +25°C 0.01 0.15 %
FS = ±0.256V 7 ppm/°C
Gain drift
(3)(4)
FS = ±2.048V 5 40 ppm/°C
FS = ±6.144V
(1)
5 ppm/°C
Gain power-supply rejection 10 ppm/V
PGA gain match
(3)
Match between any two PGA gains 0.01 0.1 %
Gain match Match between any two inputs 0.01 0.1 %
Offset match Match between any two inputs 0.6 LSB
At dc and FS = ±0.256V 105 dB
At dc and FS = ±2.048V 100 dB
Common-mode rejection At dc and FS = ±6.144V
(1)
90 dB
f
CM
= 60Hz, DR = 860SPS 105 dB
f
CM
= 50Hz, DR = 860SPS 105 dB
TEMPERATURE SENSOR
Temperature sensor range –40 +125 °C
Temperature sensor resolution 0.03125 °C/LSB
0°C to +70°C 0.2 ±0.5 °C
Temperature sensor accuracy –40°C to +125°C 0.4 ±1 °C
vs supply 0.03125 ±0.25 °C/V
(1) This parameter expresses the full-scale range of the ADC scaling. In no event should more than the smaller of VDD + 0.3V or 5.5V be
applied to this device.
(2) Best fit INL covers 99% of full-scale.
(3) Includes all errors from onboard PGA and reference.
(4) Not production tested; ensured by characterization.
Copyright © 2010–2011, Texas Instruments Incorporated 3
ADS1118
SBAS457A –OCTOBER 2010– REVISED JULY 2011
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Maximum/minimum specifications at –40°C to +125°C, VDD = 3.3V, data rate = 8SPS, and full-scale (FS) = ±2.048V, unless
otherwise noted. Typical values are at +25°C, VDD = 3.3V, data rate = 8SPS, and full-scale (FS) = ±2.048V, unless otherwise
noted.
ADS1118
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
DIGITAL INPUT/OUTPUT
Logic level
V
IH
0.7VDD VDD V
V
IL
GND 0.2VDD V
V
OH
I
OH
= 1mA 0.8VDD V
V
OL
I
OL
= 1mA GND 0.2VDD V
Input leakage
I
H
V
IH
= 5.5V ±10 μA
I
L
V
IL
= GND ±10 μA
POWER-SUPPLY REQUIREMENTS
Power-supply voltage 2 5.5 V
Power-down current at +25°C 0.5 2 μA
Power-down current up to +125°C 5 μA
Supply current
Operating current at +25°C 150 200 μA
Operating current up to +125°C 300 μA
VDD = 5.0V 0.9 mW
Power dissipation VDD = 3.3V 0.5 mW
VDD = 2.0V 0.3 mW
TEMPERATURE
Storage temperature –60 +150 °C
Specified temperature –40 +125 °C
THERMAL INFORMATION
ADS1118
THERMAL METRIC
(1)
DGS UNITS
10 PINS
θ
JA
Junction-to-ambient thermal resistance 186.8
θ
JCtop
Junction-to-case (top) thermal resistance 51.5
θ
JB
Junction-to-board thermal resistance 108.4
°C/W
ψ
JT
Junction-to-top characterization parameter 2.7
ψ
JB
Junction-to-board characterization parameter 106.5
θ
JCbot
Junction-to-case (bottom) thermal resistance n/a
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
4 Copyright © 2010–2011, Texas Instruments Incorporated
1
2
3
4
5
10
9
8
7
6
SCLK
GND
AIN0
AIN1
DIN
VDD
AIN3
AIN2
CS
DOUT/DRDY
5
10
1
2
3
4
SCLK
CS
GND
AIN0
AIN1
DIN
9
8
7
6
DOUT/DRDY
VDD
AIN3
AIN2
ADS1118
www.ti.com
SBAS457A –OCTOBER 2010–REVISED JULY 2011
PIN CONFIGURATIONS
RUG PACKAGE
DGS PACKAGE
QFN-10
MSOP-10
(TOP VIEW)
(TOP VIEW)
PIN DESCRIPTIONS
ANALOG/
DIGITAL
INPUT/
PIN # PIN NAME OUTPUT DESCRIPTION
1 SCLK Digital input Serial clock input
2 CS Digital input Chip select; active low
3 GND Analog Ground
4 AIN0 Analog input Differential channel 1: positive input or single-ended channel 1 input
5 AIN1 Analog input Differential channel 1: negative input or single-ended channel 2 input
6 AIN2 Analog input Differential channel 2: positive input or single-ended channel 3 input
7 AIN3 Analog input Differential channel 2: negative input or single-ended channel 4 input
8 VDD Analog Power supply: 2V to 5.5V
9 DOUT/DRDY Digital output Serial data out combined with data ready; active low
10 DIN Digital input Serial data input
Copyright © 2010–2011, Texas Instruments Incorporated 5
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