microPower Sampling

Burr Brown Products from Texas Instruments ADS8326 SBAS343 – MAY 2007 16-Bit, High-Speed, 2.7V to 5.5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER FEATURES • • • 16 Bits No Missing Codes (Full-Supply Range, High or Low Grade) Very Low Noise: 3LSBPP Excellent Linearity: ±1LSB typ, ±1.5LSB max INL ±0.6LSB typ, ±1LSB max DNL ±1mV max Offset ±12LSB typ Gain Error microPower: 10mW at 5V, 250kHz 4mW at 2.7V, 200kHz 2mW at 2.7V, 100kHz 0.2mW at 2.7V, 10kHz MSOP-8 Package (SON-8 package available Q4, 2007; package size same as 3x3 QFN) 16-Bit Upgrade to the 12-Bit ADS7816 and ADS7822 Pin-Compatible with the ADS7816, ADS7822, ADS7826, ADS7827, ADS7829, ADS8320, and ADS8325 Serial (SPI™/SSI) Interface APPLICATIONS • • • • • • • Battery-Operated Systems Remote Data Acquisition Isolated Data Acquisition Simultaneous Sampling, Multichannel Systems Industrial Controls Robotics Vibration Analysis • DESCRIPTION The ADS8326 is a 16-bit, sampling, analog-to-digital (A/D) converter specified for a supply voltage range from 2.7V to 5.5V. It requires very little power, even when operating at the full data rate. At lower data rates, the high speed of the device enables it to spend most of its time in the power-down mode. For example, the average power dissipation is less than 0.2mW at a 10kHz data rate. The ADS8326 offers excellent linearity and very low noise and distortion. It also features a synchronous serial (SPI/SSI-compatible) interface and a differential input. The reference voltage can be set to any level within the range of 0.1V to VDD. Low power and small size make the ADS8326 ideal for portable and battery-operated systems. It is also a perfect fit for remote data-acquisition modules, simultaneous multichannel systems, and isolated data acquisition. The ADS8326 is available in an MSOP-8 package. • • • • SAR REF ADS8326 DOUT +IN CDAC -IN S/H Amp Comparator CS/SHDN Serial Interface DCLOCK 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. SPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2007, Texas Instruments Incorporated www. ADS8326 www.ti.com SBAS343 – MAY 2007 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 (1) MAXIMUM INTEGRAL LINEARITY ERROR (LSB) (2) NO MISSING CODES ERROR (LSB) SPECIFIED TEMPERATURE RANGE TRANSPORT MEDIA, QUANTITY Tape and Reel, 250 Tape and Reel, 2500 Tape and Reel, 250 Tape and Reel, 2500 Tape and Reel, 250 Tape and Reel, 2500 Tape and Reel, 250 Tape and Reel, 2500 PRODUCT PACKAGELEAD PACKAGE DESIGNATOR PACKAGE MARKING ORDERING NUMBER ADS8326IDGKT ADS8326I ±3 16 MSOP-8 DGK –40°C to +85°C D26 ADS8326IDGKR ADS8326IBDGKT ADS8326IB ±1.5 16 MSOP-8 DGK –40°C to +85°C D26 ADS8326IBDGKR ADS8326IDRBT ADS8326I (3) ±3 16 SON-8 (3) DRB –40°C to +85°C D26 ADS8326IDRBR ADS8326IBDRBT ADS8326IB (3) ±1.5 16 SON-8 (3) DRB –40°C to +85°C D26 ADS8326IBDRBR (1) (2) (3) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet, or see the TI website at www.ti.com. Maximum Integral Linearity Error specifies a 5V power supply and reference voltage. DRB (SON-8) package available Q4, 2007. ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) ADS8326 Supply voltage, VDD to GND Analog input voltage (2) Reference input voltage (2) Digital input voltage (2) Input current to any pin except supply Power dissipation Operating virtual junction temperature range, TJ Operating free-air temperature range, TA Storage temperature range, TSTG Lead Temperature 1.6mm (1/16 inch) from case for 10sec (1) (2) –0.3 to +7 –0.3 to VDD + 0.3 –0.3 to VDD + 0.3 –0.3 to VDD + 0.3 –20 to +20 See Dissipation Ratings Table –40 to +150 –40 to +85 –65 to +150 +260 °C °C °C °C UNIT V V V V mA Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum rated conditions for extended periods may affect device reliability. All voltage values are with respect to ground terminal. 2 Submit Documentation Feedback www. ADS8326 www.ti.com SBAS343 – MAY 2007 DISSIPATION RATINGS PACKAGE DGK DRB (1) (1) RθJC +39.1°C/W +5°C/W RθJA +206.3°C/W +45.8°C/W DERATING FACTOR ABOVE TA = +25°C 4.847mW/°C 3.7mW/°C TA ≤ +25°C POWER RATING 606mW 370mW TA = +70°C POWER RATING 388mW 204mW TA = +85°C POWER RATING 315mW 148mW DRB (SON-8) package available Q4, 2007. RECOMMENDED OPERATING CONDITIONS MIN Supply voltage, GND to VDD Supply voltage, GND to VDD Reference input voltage –IN to GND Analog input voltage Operating junction temperature, TJ +IN to GND +IN – (–IN) Low-voltage levels 5V logic levels 2.7 4.5 0.1 –0.3 –0.3 0 –40 0 5.0 TYP MAX 3.6 5.5 VDD 0.5 VDD + 0.2 VREF +125 V °C UNIT V V V V ELECTRICAL CHARACTERISTICS: VDD = +5V At –40°C to +85°C, VREF = +5V, –IN = GND, fSAMPLE = 250kHz, and fDCLOCK = 24 × fSAMPLE, unless otherwise noted. ADS8326I PARAMETER ANALOG INPUT Full-scale range Operating common-mode signal Input resistance Input capacitance Input leakage current Differential input capacitance Full-power bandwidth DC ACCURACY Resolution No missing codes Integral linearity error Differential linearity error Offset error Offset error drift Gain error Gain error drift Noise Power-supply rejection SAMPLING DYNAMICS Conversion time (16 DCLOCKs) Acquisition time (4.5 DCLOCKs) Throughput rate (22 DCLOCKs) Clock frequency fDCLOCK 0.024 tCONV 24kHz ≤ fDCLOCK ≤ 6MHz tAQ fDCLOCK = 6MHz 2.667 0.75 250 6 0.024 666.7 2.667 0.75 250 6 666.7 µs µs kSPS MHz 4.75V ≤ VDD ≤ 5.25V NMC INL DNL VOS TCVOS GERR TCGERR –24 ±0.3 30 0.5 16 16 –3 –1 –1.5 ±2 ±0.5 ±0.75 ±0.2 +24 –12 ±0.3 30 0.5 +3 +2 +1.5 16 16 –1.5 –1 –1 ±1 ±0.4 ±0.5 ±0.2 +12 +1.5 +1 +1 Bits Bits LSB LSB mV ppm/°C LSB ppm/°C µVRMS LSB RON –IN = GND, off –IN = GND, on –IN = GND, during sampling –IN = GND +IN to –IN, during sampling FS sinewave, SINAD = FSBW –60dB FSR +IN – (–IN) 0 –0.3 5 50 48 ±50 20 500 100 VREF 0.5 0 –0.3 5 50 48 ±50 20 500 100 VREF 0.5 V V GΩ Ω pF nA pF kHz TEST CONDITIONS MIN TYP MAX MIN ADS8326IB TYP MAX UNIT Submit Documentation Feedback 3 www. ADS8326 www.ti.com SBAS343 – MAY 2007 ELECTRICAL CHARACTERISTICS: VDD = +5V (continued) At –40°C to +85°C, VREF = +5V, –IN = GND, fSAMPLE = 250kHz, and fDCLOCK = 24 × fSAMPLE, unless otherwise noted. ADS8326I PARAMETER AC ACCURACY Total harmonic distortion Spurious-free dynamic range Signal-to-noise ratio THD 5VPP sinewave at 2kHz 5VPP sinewave at 10kHz 5VPP sinewave at 2kHz 5VPP sinewave at 10kHz 5VPP sinewave at 2kHz 5VPP sinewave at 10kHz 5VPP sinewave at 2kHz 5VPP sinewave at 10kHz 5VPP sinewave at 2kHz 5VPP sinewave at 10kHz 0.1 CS = GND, fSAMPLE = 0Hz CS = VDD fS = 250kHz fS = 200kHz Reference input current fS = 100kHz fS = 10kHz CS = VDD DIGITAL INPUTS (1) Logic family High-level input voltage Low-level input voltage Input current Input capacitance DIGITAL OUTPUTS (1) Logic family High-level output voltage Low-level output voltage High-impedance state output current Output capacitance Load capacitance Data format VOH VDD = 4.5V, IOH = –100µA VOL VDD = 4.5V, IOL = 100µA IOZ CS = VDD, VI = VDD or GND CO CL Straight binary –50 5 30 Straight binary 4.44 0.5 +50 –50 5 30 CMOS 4.44 0.5 +50 CMOS V V nA pF pF VIH VIL IIN VI = VDD or GND CI 0.7 × VDD –0.3 –50 5 CMOS VDD + 0.3 0.3 × VDD +50 0.7 × VDD –0.3 –50 5 CMOS VDD + 0.3 0.3 × VDD +50 V V nA pF 5 5 24 170 140 70 11 0.1 220 180 90 14 –98 –90 102 94 91 91 90 87.5 14.69 14.28 –99 –91 103 95 91.5 91.5 91 88 14.86 14.35 dB dB dB dB dB dB dB dB Bits Bits TEST CONDITIONS MIN TYP MAX MIN ADS8326IB TYP MAX UNIT SFDR SNR Signal-to-noise + distortion SINAD Effective number of bits VOLTAGE REFERENCE INPUT Reference voltage Reference input resistance Reference input capacitance ENOB VDD 0.1 5 5 24 170 140 70 11 0.1 VDD V GΩ GΩ pF µA µA µA µA µA 220 180 90 14 (1) Applies for 5.0V nominal supply: VDD (min) = 4.5V and VDD (max) = 5.5V. 4 Submit Documentation Feedback www. ADS8326 www.ti.com SBAS343 – MAY 2007 ELECTRICAL CHARACTERISTICS: VDD = +2.7V At –40°C to +85°C, VREF = +2.5V, –IN = GND, fSAMPLE = 200kHz, and fDCLOCK = 24 × fSAMPLE, unless otherwise noted. ADS8326I PARAMETER ANALOG INPUT Full-scale range Operating common-mode signal Input resistance Input capacitance Input leakage current Differential input capacitance Full-power bandwidth DC ACCURACY Resolution No missing code Integral linearity error Differential linearity error Offset error Offset error drift Gain error Gain error drift Noise Power-supply rejection SAMPLING DYNAMICS Conversion time (16 DCLOCKs) Acquisition time (4.5 DCLOCKs) Throughput rate (22 DCLOCKs) Clock frequency AC ACCUR