AV D
中国包揽乒乓球女单冠亚军D DVDD
AIN0P
shithole什么意思
AIN1N
AIN0N
AIN1P
PDEN
SCLK
SDO
CS
REFGND
REF
CH SEL
AV D
D DVDD
AIN0
AIN1GND
AIN0GND
AIN1
PDEN
SCLK
SDO
CS
REFGND
REF
CH SEL
ADS7945
ADS7946
SBAS539B–JUNE2011–REVISED SEPTEMBER2011 14-Bit,2MSPS,Dual-Channel,Differential/Single-Ended,
Ultralow-Power Analog-to-Digital Converters
Check for Samples:ADS7945,ADS7946
FEATURES DESCRIPTION
The ADS7945/6are14-bit,2MSPS analog-to-digital •Sample Rate:2MSPS
converters(ADCs),with differential and single-ended •14-Bit,Pin-Compatible with8/10/12-bit inputs,respectively.The devices operate at a2 ADS7947/8/9Family(ADS7946)MSPS sample rate with a standard16-clock data •Outstanding Performance:frame.The devices feature both outstanding dc
precision and excellent dynamic performance;the –SNR:84dB(ADS7945)
stationarityADS7946is pin-compatible with the8/10/12-bit –No Missing Codes ADS7947/8/9devices.The devices include a
–INL:1.5LSB(max)(ADS7945)two-channel input multiplexer and a low-power
successive approximation register(SAR)ADC with •Low Power:
an inherent sample-and-hold(S/H)input stage.
–11.6mW at2MSPS Operation
The ADS7945/6support a wide analog supply range –Auto Power-Down at Lower Speeds:
that allows the full-scale input range to extend to±5V –7.2mW at500kSPS differential or5V single-ended.A simple SPI™,with
– 1.4mW at100kSPS a digital supply that can operate as low as1.65V,
allows for easy interfacing to a wide variety of digital –0.3mW at20kSPS
controllers.Automatic power-down can be enabled •Wide Supply Range:
when operating at slower speeds to dramatically –Analog:2.7V to5.25V reduce power consumption.
–Digital:1.65V to AVDD Offered in a tiny3mm×3mm QFN package,the •Simple Serial Interface(SPI)ADS7945/6are fully specified over the extended
temperature range of–40°C to+125°C and are •Fully Specified from–40°C to+125°C
suitable for a wide variety of data acquisition •Tiny Footprint:3mm×3mm QFN
applications where high performance,low power,and
small package size are key.
新东方招聘APPLICATIONS
•Optical Networking
•Medical Instrumentation
•Battery-Powered Equipment
•Data Acquisition Systems
Plea be aware that an important notice concerning availability,standard warranty,and u in critical applications of Texas苇塘
Instruments miconductor products and disclaimers thereto appears at the end of this data sheet.
a trademark of Motorola.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.Copyright©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.
ADS7945
ADS7946
SBAS539B–JUNE2011–REVISED
The devices have limited built-in ESD protection.The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
FAMILY AND ORDERING INFORMATION(1)
PRODUCT RESOLUTION(Bits)INPUT
ADS794514Unipolar,differential
ADS794614Unipolar,single-ended
ADS794712Unipolar,single-ended
are
ADS794810Unipolar,single-ended
ADS79498Unipolar,single-ended
(1)For the most current package and ordering information,e the Package Option Addendum at the end of this document,or visit the
device product folder at
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range,unless otherwi noted.
英语下载
VALUE UNIT
AINxP to GND or AINxN to GND(ADS7945)–0.3to AVDD+0.3V
AINx to GND(ADS7946)–0.3to AVDD+0.3V AINxGND to GND(ADS7946)–0.3to+0.3V
AVDD to GND or DVDD to GND–0.3to7V
Digital input voltage to GND–0.3to DVDD+0.3V
Digital output to GND–0.3to DVDD+0.3V Operating temperature range–40to+125°C
Storage temperature range–65to+150°C
Human body model(HBM)2000V
ESD ratings Charged device model(CDM)500V
Machine model(MM)200V
result from(1)Stress beyond tho listed under absolute maximum ratings may cau permanent damage to the device.The are stress ratings保质期英文
only,and functional operation of the device at the or any other conditions beyond tho indicated under electrical characteristics is not implied.Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
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Product Folder Link(s):ADS7945ADS7946
ADS7945
ADS7946 SBAS539B–JUNE2011–REVISED SEPTEMBER2011 ELECTRICAL CHARACTERISTICS:ADS7945(Differential)
Minimum/maximum specifications at T A=–40°C to+125°C,AVDD=2.7V to5.25V,DVDD=1.65V to AVDD,input common-mode=V REF/2±0.2,and f SAMPLE=2MSPS,unless otherwi noted.
Typical specifications at T A=+25°C,AVDD=5V,DVDD=1.8V,input common-mode=V REF/2±0.2,and f SAMPLE=2MSPS.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS ANALOG INPUT
Full-scale input span(1)AINxP–AINxN–V REF V REF V
AIN0P,AIN1P–0.2AVDD+0.2V Absolute input range
AIN0N,AIN1N–0.2AVDD+0.2V Input common-mode range(2)(AINxP+AINxN)/2V REF/2±0.2V Input capacitance(3)32pF Input leakage current At+125°C 1.5nA SYSTEM PERFORMANCE
Resolution14Bits
No missing codes14Bits Integral linearity–1.5±0.8 1.5LSB(4) Differential linearity–1±0.8 1.5LSB Offt error(5)–4±1.54LSB Gain error–4±1.54LSB Transition noi25µV RMS Power-supply rejection With500Hz sine wave on AVDD60dB SAMPLING DYNAMICS
Conversion time16SCLK Acquisition time80ns Maximum sample rate(throughput rate)40MHz SCLK with a16-clock frame2MSPS Aperture delay(6)10ns Aperture jitter(6)10ps Step respon(6)(3)80ns DYNAMIC CHARACTERISTICS
Total harmonic distortion(THD)(7)20kHz,V REF=4.0V–92dB
20kHz,V REF=4.0V8284dB Signal-to-noi ratio(SNR)
100kHz,V REF=4.0V83dB Signal-to-noi and distorion ratio(SINAD)20kHz,V REF=4.0V83.5dB Spurious-free dynamic range(SFDR)20kHz,V REF=4.0V94dB Full-power bandwidth(8)At–3dB15MHz
(1)Ideal input span;does not include gain or offt error.
(2)Refer to the Input Common-Mode Range ction in Application Information.
(3)Refer to Figure76for sampling circuit details.
(4)LSB means least significant bit.
(5)Measured relative to an ideal full-scale input.
(6)Ensured by simulation.
(7)Calculated on the first nine harmonics of the input frequency.
(8)Indicates signal bandwidth for undersampling applications.
Copyright©2011,Texas Instruments Incorporated Submit Documentation Feedback3
Product Folder Link(s):ADS7945ADS7946
ADS7945
ADS7946
SBAS539B–JUNE2011–REVISED ELECTRICAL CHARACTERISTICS:ADS7945(Differential)(continued)
Minimum/maximum specifications at T A=–40°C to+125°C,AVDD=2.7V to5.25V,DVDD=1.65V to AVDD,input common-mode=V REF/2±0.2,and f SAMPLE=2MSPS,unless otherwi noted.
学新娘化妆盘头Typical specifications at T A=+25°C,AVDD=5V,DVDD=1.8V,input common-mode=V REF/2±0.2,and f SAMPLE=2MSPS.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS DIGITAL INPUT/OUTPUT
Logic family CMOS
V IH0.7DVDD V
V IL0.3DVDD V Logic level
V OH SDO load20pF0.8DVDD V
V OL SDO load20pF0.2DVDD V Input leakage current I IH,I IL0<V IN<DVDD±20nA External reference 2.5AVDD V POWER-SUPPLY REQUIREMENTS
AVDD 2.7 3.3 5.25V DVDD 1.65 3.3AVDD V
AVDD=3.3V,f SAMPLE=2MSPS 3.54mA
I DYNAMIC
AVDD=5V,f SAMPLE=2MSPS45mA AVDD supply current
AVDD=3.3V,SCLK off 2.3mA
I STATIC
AVDD=5V,SCLK off 2.53mA
DVDD=3.3V,f SAMPLE=2MSPS,
DVDD supply current(9)750µA
SDO load20pF
I PD-DYNAMIC SCLK=40MHz550µA Power-down state
AVDD supply current I
SCLK off 2.5µA PD-STATIC
Power-up time From power-down state using PDEN pin1µs TEMPERATURE RANGE
Specified performance–40+125°C (9)DVDD consumes only dynamic current.I DVDD=C LOAD×DVDD×number of0→1transitions in SDO×f SAMPLE.
This is a load-dependent current and there is no DVDD current when the output is not toggling.
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Product Folder Link(s):ADS7945ADS7946
ADS7945
ADS7946 SBAS539B–JUNE2011–REVISED SEPTEMBER2011 ELECTRICAL CHARACTERISTICS:ADS7946(Single-Ended)
Minimum/maximum specifications at T A=–40°C to+125°C,AVDD=2.7V to5.25V,DVDD=1.65V to AVDD,
and f SAMPLE=2MSPS,unless otherwi noted.
Typical specifications at T A=+25°C,AVDD=5V,DVDD=1.8V,and f SAMPLE=2MSPS.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS ANALOG INPUT
Full-scale input span(1)AINx–AINxGND0V REF V
AIN0,AIN1–0.2AVDD+0.2V Absolute input range
AIN0GND,AIN1GND–0.20.2V Input capacitance(2)32pF Input leakage current At+125°C 1.5nA SYSTEM PERFORMANCE
Resolution14Bits
No missing codes14Bits Integral linearity–2.5±1.25 2.5LSB(3) Differential linearity–1±0.8 2.0LSB Offt error(4)–4±1.54LSB Gain error–4±1.54LSB Transition noi25µV RMS Power-supply rejection With500Hz sine wave on AVDD60dB SAMPLING DYNAMICS
Conversion time16SCLK Acquisition time80ns Maximum sample rate(throughput rate)40MHz SCLK
with a16-clock frame2MSPS Aperture delay(5)10ns Aperture jitter(5)10ps Step respon(5)(2)80ns DYNAMIC CHARACTERISTICS
Total harmonic distortion(THD)(6)20kHz,V REF=4.0V–85dB
20kHz,V REF=4.0V7982dB Signal-to-noi ratio(SNR)
100kHz,V REF=4.0V80dB Signal-to-noi and distortion ratio(SINAD)20kHz,V REF=4.0V78.8dB Spurious-free dynamic range(SFDR)20kHz,V REF=4.0V86dB Full-power bandwidth(7)At–3dB15MHz DIGITAL INPUT/OUTPUT
Logic family CMOS
V IH0.7DVDD V
V IL0.3DVDD V Logic level
V OH SDO load20pF0.8DVDD V
V OL SDO load20pF0.2DVDD V Input leakage current I IH,I IL0<V IN<DVDD±20nA External reference 2.5AVDD V
(1)Ideal input span;does not include gain or offt error.
(2)Refer to Figure76for sampling circuit details.
(3)LSB means least significant bit.
(4)Measured relative to an ideal full-scale input.
(5)Ensured by simulation.
(6)Calculated on the first nine harmonics of the input frequency.
(7)Indicates signal bandwidth for undersampling applications.
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Product Folder Link(s):ADS7945ADS7946
