ADS7841资料.pdf

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ADS7841 ADS7841 ADS7841 SBAS084B – JULY 2001 12-Bit, 4-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER FEATURES G SINGLE SUPPLY: 2.7V to 5V G 4-CHANNEL SINGLE-ENDED OR 2-CHANNEL DIFFERENTIAL INPUT G UP TO 200kHz CONVERSION RATE G ±1LSB MAX INL AND DNL G NO MISSING CODES G 72dB SINAD G SERIAL INTERFACE G DIP-16 OR SSOP-16 PACKAGE G ALTERNATE SOURCE FOR MAX1247 G ADS7841ES: +125°C Version APPLICATIONS G DATA ACQUISITION G TEST AND MEASUREMENT G INDUSTRIAL PROCESS CONTROL G PERSONAL DIGITAL ASSISTANTS G BATTERY-POWERED SYSTEMS DESCRIPTION The ADS7841 is a 4-channel, 12-bit sampling Analog-to- Digital Converter (ADC) with a synchronous serial inter- face. The resolution is programmable to either 8 bits or 12 bits. Typical power dissipation is 2mW at a 200kHz through- put rate and a +5V supply. The reference voltage (VREF) can be varied between 100mV and VCC, providing a correspond- ing input voltage range of 0V to VREF. The device includes a shutdown mode which reduces power dissipation to under 15µW. The ADS7841 is tested down to 2.7V operation. Low power, high speed, and on-board multiplexer make the ADS7841 ideal for battery-operated systems such as per- sonal digital assistants, portable multi-channel data loggers, and measurement equipment. The serial interface also pro- vides low-cost isolation for remote data acquisition. The ADS7841 is available in a DIP-16 or a SSOP-16 package and is specified over the –40°C to +125°C(1) temperature range. NOTE: (1) ES grade only. Four Channel Multiplexer CDAC CH0 CH1 CH2 CH3 COM VREF SAR Comparator DCLK CS SHDN DIN DOUT MODE BUSY Serial Interface and Control 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. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. www.ti.com Copyright © 2000, Texas Instruments Incorporated

ABSOLUTE MAXIMUM RATINGS(1) +VCC to GND ........................................................................ –0.3V to +6V Analog Inputs to GND ............................................ –0.3V to +VCC + 0.3V Digital Inputs to GND ........................................................... –0.3V to +6V Power Dissipation .......................................................................... 250mW Maximum Junction Temperature ................................................... +150°C Operating Temperature Range .................................. –40°C to +125°C(2) Storage Temperature Range ......................................... –65°C to +150°C Lead Temperature (soldering, 10s) ............................................... +300°C NOTES: (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. (2) ADS7841ES 0nly. All other grades are: –40°C to +85°C. PACKAGE/ORDERING INFORMATION MINIMUM RELATIVE ACCURACY PRODUCT (LSB) MAXIMUM GAIN ERROR (LSB) ADS7841E " ADS7841P ADS7841EB " ADS7841PB ADS7841ES ±2 " ±2 ±1 " ±1 ±2 ±4 " " ±3 " " ±4 SPECIFICATION TEMPERATURE RANGE –40°C to +85°C " –40°C to +85°C –40°C to +85°C " –40°C to +85°C –40°C to +125°C ELECTROSTATIC DISCHARGE SENSITIVITY This integrated circuit can be damaged by ESD. Texas Instru- ments 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. PACKAGE DESIGNATOR PACKAGE DRAWING NUMBER DBQ " N DBQ " N DBQ 322 " 180 322 " 180 322 ORDERING NUMBER(1) TRANSPORT MEDIA ADS7841E Rails ADS7841E/2K5 Tape and Reel ADS7841P ADS7841EB Rails Rails ADS7841EB/2K5 Tape and Reel ADS7841PB Rails ADS7841ES/2K5 Tape and Reel PACKAGE SSOP-16 " DIP-16 SSOP-16 " DIP-16 SSOP-16 NOTES: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “ADS7841E/2K5” will get a single 2500-piece Tape and Reel. PIN CONFIGURATIONS Top View DIP +VCC CH0 CH1 CH2 CH3 COM SHDN VREF 1 2 3 4 5 6 7 8 ADS7841 16 DCLK 15 CS 14 DIN 13 BUSY 12 DOUT 11 MODE 10 GND 9 +VCC PIN DESCRIPTIONS PIN NAME DESCRIPTION SSOP ADS7841 16 DCLK 15 CS 14 DIN 13 BUSY 12 DOUT 11 MODE 10 GND 9 +VCC +VCC CH0 CH1 CH2 CH3 COM SHDN VREF 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 2 +VCC CH0 CH1 CH2 CH3 COM SHDN VREF +VCC GND MODE DOUT BUSY DIN CS DCLK Power Supply, 2.7V to 5V Analog Input Channel 0 Analog Input Channel 1 Analog Input Channel 2 Analog Input Channel 3 Ground Reference for Analog Inputs. Sets zero code voltage in single-ended mode. Connect this pin to ground or ground reference point. Shutdown. When LOW, the device enters a very low power shutdown mode. Voltage Reference Input Power Supply, 2.7V to 5V Ground Conversion Mode. When LOW, the device always performs a 12-bit conversion. When HIGH, the resolution is set by the MODE bit in the CONTROL byte. Serial Data Output. Data is shifted on the falling edge of DCLK. This output is high impedance when CS is HIGH. Busy Output. This output is high impedance when CS is HIGH. Serial Data Input. If CS is LOW, data is latched on rising edge of DCLK. Chip Select Input. Controls conversion timing and enables the serial input/output register. External Clock Input. This clock runs the SAR conversion process and synchronizes serial data I/O. ADS7841 SBAS084B

ELECTRICAL CHARACTERISTICS: +5V At TA = TMIN to TMAX, +VCC = +5V, VREF = +5V, fSAMPLE = 200kHz, and fCLK = 16 • fSAMPLE = 3.2MHz, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS ADS7841E, P ADS7841EB, PB ADS7841ES ANALOG INPUT Full-Scale Input Span Absolute Input Range Positive Input - Negative Input Positive Input Negative Input Capacitance Leakage Current SYSTEM PERFORMANCE Resolution No Missing Codes Integral Linearity Error Differential Linearity Error Offset Error Offset Error Match Gain Error Gain Error Match Noise Power-Supply Rejection SAMPLING DYNAMICS Conversion Time Acquisition Time Throughput Rate Multiplexer Settling Time Aperture Delay Aperture Jitter DYNAMIC CHARACTERISTICS Total Harmonic Distortion(2) VIN = 5Vp-p at 10kHz Signal-to-(Noise + Distortion) VIN = 5Vp-p at 10kHz Spurious-Free Dynamic Range VIN = 5Vp-p at 10kHz Channel-to-Channel Isolation VIN = 5Vp-p at 50kHz REFERENCE INPUT Range Resistance Input Current DCLK Static fSAMPLE = 12.5kHz DCLK Static 0 –0.2 –0.2 12 3 68 72 0.1 DIGITAL INPUT/OUTPUT Logic Family Logic Levels VIH VIL VOH VOL Data Format PWR SUPPLY REQUIREMENTS +VCC Quiescent Current | IIH | ≤ +5µA | IIL | ≤ +5µA IOH = –250µA IOL = 250µA 3.0 –0.3 3.5 Specified Performance 4.75 Power Dissipation TEMPERATURE RANGE Specified Performance fSAMPLE = 12.5kHz Power-Down Mode(3), CS = +VCC –40 Same specifications as ADS7841E, P. VREF +VCC +0.2 +1.25 200 ±2 ±3 1.0 ±4 1.0 12 200 –72 25 12 ±0.8 0.15 0.1 30 70 500 30 100 –78 71 79 120 +VCC 100 3 5 40 2.5 0.001 CMOS Straight Binary 550 300 5.5 +0.8 0.4 5.25 900 3 4.5 +85 12 ±0.5 200 ±1 ±1 ±3 11 ±0.8 200 2 ±4 V V V pF nA Bits Bits LSB(1) LSB LSB LSB LSB LSB µVrms dB Clk Cycles Clk Cycles 70 76 –80 72 81 –76 68 72 –72 –78 71 79 120 +125 kHz ns ns ps dB dB dB dB V GΩ µA µA µA V V V V V µA µA µA mW °C NOTE: (1) LSB means Least Significant Bit. With VREF equal to +5.0V, one LSB is 1.22mV. (2) First five harmonics of the test frequency. (3) Auto power-down mode (PD1 = PD0 = 0) active or SHDN = GND. ADS7841 SBAS084B 3 ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻

ELECTRICAL CHARACTERISTICS: +2.7V At TA = –40°C to +85°C, +VCC = +2.7V, VREF = +2.5V, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted. PARAMETER ANALOG INPUT Full-Scale Input Span Absolute Input Range Capacitance Leakage Current SYSTEM PERFORMANCE Resolution No Missing Codes Integral Linearity Error Differential Linearity Error Offset Error Offset Error Match Gain Error Gain Error Match Noise Power-Supply Rejection SAMPLING DYNAMICS Conversion Time Acquisition Time Throughput Rate Multiplexer Settling Time Aperture Delay Aperture Jitter DYNAMIC CHARACTERISTICS Total Harmonic Distortion(2) Signal-to-(Noise + Distortion) Spurious-Free Dynamic Range Channel-to-Channel Isolation REFERENCE INPUT Range Resistance Input Current DIGITAL INPUT/OUTPUT Logic Family Logic Levels VIH VIL VOH VOL Data Format POWER SUPPLY REQUIREMENTS +VCC Quiescent Current Power Dissipation TEMPERATURE RANGE Specified Performance Same specifications as ADS7841E, P. CONDITIONS MIN TYP MAX MIN TYP MAX UNITS ADS7841E, P ADS7841EB, PB Positive Input - Negative Input Positive Input Negative Input VIN = 2.5Vp-p at 10kHz VIN = 2.5Vp-p at 10kHz VIN = 2.5Vp-p at 10kHz VIN = 2.5Vp-p at 50kHz DCLK Static fSAMPLE = 12.5kHz DCLK Static | IIH | ≤ +5µA | IIL | ≤ +5µA IOH = –250µA IOL = 250µA 0 –0.2 –0.2 12 3 68 72 0.1 +VCC • 0.7 –0.3 +VCC • 0.8 25 ±1 12 ±0.8 0.15 0.1 30 70 500 30 100 –77 71 78 100 5 13 2.5 0.001 CMOS Straight Binary 280 220 Specified Performance 2.7 fSAMPLE = 12.5kHz Power-Down Mode(3), CS = +VCC –40 +VCC +0.2 VREF +0.2 12 ±0.5 ±1 ±1 ±3 70 76 –79 72 80 –76 ±2 ±3 1.0 ±4 1.0 12 125 –72 +VCC 40 3 5.5 +0.8 0.4 3.6 650 3 1.8 +85 V V V pF µA Bits Bits LSB(1) LSB LSB LSB LSB LSB µVrms dB Clk Cycles Clk Cycles kHz ns ns ps dB dB dB dB V GΩ µA µA µA V V V V V µA µA µA mW °C NOTE: (1) LSB means Least Significant Bit. With VREF equal to +2.5V, one LSB is 610mV. (2) First five harmonics of the test frequency. (3) Auto power-down mode (PD1 = PD0 = 0) active or SHDN = GND. 4 ADS7841 SBAS084B ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻ ✻

TYPICAL CHARACTERISTICS: +5V At TA = +25°C, +VCC = +5V, VREF = +5V, fSAMPLE = 200kHz, and fCLK = 16 • fSAMPLE = 3.2MHz, unless otherwise noted. FREQUENCY SPECTRUM (4096 Point FFT; fIN = 1,123Hz, –0.2dB) FREQUENCY SPECTRUM (4096 Point FFT; fIN = 10.3kHz, –0.2dB) 0 –20 –40 –60 –80 –100 –120 ) B d ( e d u t i l p m A ) B d ( e d u t i l p m A 0 –20 –40 –60 –80 –100 –120 ) B d ( I D A N S d n a R N S 0 25 50 75 100 0 25 50 75 100 Frequency (kHz) Frequency (kHz) SIGNAL-TO-NOISE RATIO AND SIGNAL-TO- (NOISE+DISTORTION) vs INPUT FREQUENCY SPURIOUS-FREE DYNAMIC RANGE AND TOTAL HARMONIC DISTORTION vs INPUT FREQUENCY SNR SINAD 74 73 72 71 70 69 68 ) B d ( R D F S 85 80 75 70 65 SFDR THD 1 10 100 1 10 Input Frequency (kHz) Input Frequency (kHz) –85 –80 –75 –70 ) B d ( D H T –65 100 EFFECTIVE NUMBER OF BITS vs INPUT FREQUENCY CHANGE IN SIGNAL-TO-(NOISE+DISTORTION) vs TEMPERATURE 12.0 11.8 11.6 11.4 s t i B f o r e b m u N e v i t c e f f E 11.2 11.0 1 ADS7841 SBAS084B 0.6 0.4 0.2 0.0 –0.2 –0.4 –0.6 ) B d ( C ° 5 2 + m o r f a t l e D fIN = 10kHz, –0.2dB 10 Input Frequency (kHz) 100 –40 –20 0 20 40 60 80 100 Temperature (°C) 5

TYPICAL CHARACTERISTICS: +2.7V At TA = +25°C, +VCC = +2.7V, VREF = +2.5V, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted. FREQUENCY SPECTRUM (4096 Point FFT; fIN = 1,129Hz, –0.2dB) FREQUENCY SPECTRUM (4096 Point FFT; fIN = 10.6kHz, –0.2dB) 0 –20 –40 –60 –80 –100 –120 ) B d ( e d u t i l p m A ) B d ( e d u t i l p m A 0 –20 –40 –60 –80 –100 –120 0 15.6 31.3 46.9 62.5 0 15.6 31.3 46.9 62.5 Frequency (kHz) Frequency (kHz) 78 74 70 66 62 58 54 ) B d ( I D A N S d n a R N S 1 1 s t i B f o r e b m u N e v i t c e f f E 12.0 11.5 11.0 10.5 10.0 9.5 9.0 6 SIGNAL-TO-NOISE RATIO AND SIGNAL-TO- (NOISE+DISTORTION) vs INPUT FREQUENCY SPURIOUS-FREE DYNAMIC RANGE AND TOTAL HARMONIC DISTORTION vs INPUT FREQUENCY SNR SINAD ) B d ( R D F S 90 85 80 75 70 65 60 55 50 SFDR THD –90 –85 –80 –75 –70 –65 –60 –55 –50 ) B d ( D H T 10 Input Frequency (kHz) 100 1 10 100 Input Frequency (kHz) EFFECTIVE NUMBER OF BITS vs INPUT FREQUENCY CHANGE IN SIGNAL-TO-(NOISE+DISTORTION) vs TEMPERATURE fIN = 10kHz, –0.2dB 0.4 0.2 0.0 –0.2 –0.4 –0.6 –0.8 ) B d ( C ° 5 2 + m o r f a t l e D 10 Input Frequency (kHz) 100 –40 –20 0 20 40 60 80 100 Temperature (˚C) ADS7841 SBAS084B

TYPICAL CHARACTERISTICS: +2.7V (Cont.) At TA = +25°C, +VCC = +2.7V, VREF = +2.5V, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted. SUPPLY CURRENT vs TEMPERATURE POWER DOWN SUPPLY CURRENT vs TEMPERATURE ) A n ( t n e r r u C y p p u S l 140 120 100 80 60 40 20 –40 –20 0 20 40 60 80 100 –40 –20 0 20 40 60 80 100 Temperature (˚C) Temperature (˚C) INTEGRAL LINEARITY ERROR vs CODE DIFFERENTIAL LINEARITY ERROR vs CODE ) A µ ( t n e r r u C y p p u S l 400 350 300 250 200 150 100 ) B S L ( E L I 1.00 0.75 0.50 0.25 0.00 –0.25 –0.50 –0.75 –1.00 ) B S L ( E L D 1.00 0.75 0.50 0.25 0.00 –0.25 –0.50 –0.75 –1.00 000H 800H Output Code FFFH 000H 800H Output Code FFFH ) B S L ( C ˚ 5 2 + m o r f a t l e D 0.15 0.10 0.05 0.00 –0.05 –0.10 –0.15 CHANGE IN GAIN vs TEMPERATURE CHANGE IN OFFSET vs TEMPERATURE ) B S L ( C ˚ 5 2 + m o r f a t l e D 0.6 0.4 0.2 0.0 –0.2 –0.4 –0.6 –40 –20 0 20 40 60 80 100 –40 –20 0 20 40 60 80 100 Temperature (˚C) Temperature (˚C) ADS7841 SBAS084B 7

TYPICAL CHARACTERISTICS: +2.7V (Cont.) At TA = +25°C, +VCC = +2.7V, VREF = +2.5V, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted. REFERENCE CURRENT vs SAMPLE RATE REFERENCE CURRENT vs TEMPERATURE ) A µ ( t n e r r u C e c n e r e f e R 14 12 10 8 6 4 2 0 ) A µ ( t n e r r u C y p p u S l 320 300 280 260 240 220 200 180 8 ) A µ ( t n e r r u C e c n e r e f e R 18 16 14 12 10 8 6 0 25 50 75 100 125 –40 –20 0 20 40 60 80 100 Sample Rate (kHz) Temperature (˚C) SUPPLY CURRENT vs +VCC MAXIMUM SAMPLE RATE vs +VCC fSAMPLE = 12.5kHz VREF = +VCC 1M 100k ) z H ( e t l a R e p m a S 10k 1k VREF = +VCC 2 2.5 3 3.5 4 4.5 5 2 2.5 3 3.5 4 4.5 5 +VCC (V) +VCC (V) ADS7841 SBAS084B

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