Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsData collecting ICsData acquisition IC - AD converter (ADC) External , Internal TSSOP 16

SAR

2.5V V

REF

Serial

Interface

SDA

Comparator

S/H Amp

REF /REF

IN OUT

SCL

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

COM

CDAC

8-Channel

MUX

Buffer

ADS7830

www.ti.com

SBAS302C –DECEMBER 2003–REVISED OCTOBER 2012

8-Bit, 8-Channel Sampling

ANALOG-TO-DIGITAL CONVERTER

with I

C™ Interface

Check for Samples: ADS7830

FEATURES

APPLICATIONS

• 70kHz SAMPLING RATE

• VOLTAGE-SUPPLY MONITORING

• ±0.5LSB INL/DNL • ISOLATED DATA ACQUISITION

• 8 BITS NO MISSING CODES • TRANSDUCER INTERFACE

• 4 DIFFERENTIAL/8 SINGLE-ENDED INPUTS • BATTERY-OPERATED SYSTEMS

• 2.7V TO 5V OPERATION • REMOTE DATA ACQUISITION

• BUILT-IN 2.5V REFERENCE/BUFFER

DESCRIPTION

• SUPPORTS ALL THREE I

C MODES:

The ADS7830 is a single-supply, low-power, 8-bit

Standard, Fast, and High-Speed

data acquisition device that features a serial I

• LOW POWER:

interface and an 8-channel multiplexer. The Analog-

180μW (Standard Mode)

to-Digital (A/D) converter features a sample-and-hold

300μW (Fast Mode)

amplifier and internal, asynchronous clock. The

675μW (High-Speed Mode)

combination of an I

C serial, 2-wire interface and

micropower consumption makes the ADS7830 ideal

• DIRECT PIN COMPATIBLE WITH ADS7828

for applications requiring the A/D converter to be

• TSSOP-16 PACKAGE

close to the input source in remote locations and for

applications requiring isolation. The ADS7830 is

available in a TSSOP-16 package.

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.

C is a trademark of NXP Semiconductors.

3All 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.

Summary of content (26 pages)

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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 8-Bit, 8-Channel Sampling ANALOG-TO-DIGITAL CONVERTER with I2C™ Interface Check for Samples: ADS7830 FEATURES APPLICATIONS • • • • • • • • • • • • 1 23 • • • 70kHz SAMPLING RATE ±0.5LSB INL/DNL 8 BITS NO MISSING CODES 4 DIFFERENTIAL/8 SINGLE-ENDED INPUTS 2.7V TO 5V OPERATION BUILT-IN 2.
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ADS7830 SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 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.
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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 ELECTRICAL CHARACTERISTICS: +2.7V At TA = –40°C to +125°C, +VDD = +2.7V, VREF = +2.5V, and SCL Clock Frequency = 3.4MHz (High-Speed Mode), unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG INPUT Full-Scale Input Scan Absolute Input Range Positive Input – Negative Input 0 VREF V Positive Input –0.2 +VDD + 0.2 V Negative Input –0.2 +0.
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ADS7830 SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 www.ti.com ELECTRICAL CHARACTERISTICS: +2.7V (continued) At TA = –40°C to +125°C, +VDD = +2.7V, VREF = +2.5V, and SCL Clock Frequency = 3.4MHz (High-Speed Mode), unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT DIGITAL INPUT/OUTPUT Logic Family Logic Levels CMOS VIH +VDD × 0.7 +VDD + 0.5 V VIL –0.3 +VDD × 0.3 V 0.4 V 10 µA VOL Input Leakage Minimum 3mA Sink Current IIH VIH = +VDD + 0.5V IIL VIL = –0.
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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 ELECTRICAL CHARACTERISTICS: +5V At TA = –40°C to +125°C, +VDD = +5.0V, VREF = External +5.0V, and SCL Clock Frequency = 3.4MHz (High-Speed Mode), unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG INPUT Full-Scale Input Scan Absolute Input Range Positive Input – Negative Input 0 VREF V Positive Input –0.2 +VDD + 0.2 V Negative Input –0.2 +0.
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ADS7830 SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 www.ti.com ELECTRICAL CHARACTERISTICS: +5V (continued) At TA = –40°C to +125°C, +VDD = +5.0V, VREF = External +5.0V, and SCL Clock Frequency = 3.4MHz (High-Speed Mode), unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT DIGITAL INPUT/OUTPUT Logic Family Logic Levels CMOS VIH +VDD × 0.7 +VDD + 0.5 V VIL –0.3 +VDD × 0.3 V 0.4 V 10 µA VOL Input Leakage Minimum 3mA Sink Current IIH VIH = +VDD + 0.5V IIL VIL = –0.
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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 TIMING DIAGRAM SDA tBUF tLOW tF tR tSP tHD; STA SCL tHD; STA tSU; STA tHD; DAT STOP START tHIGH tSU; STO tSU; DAT REPEATED START TIMING CHARACTERISTICS (1) At TA = –40°C to +125°C and +VDD = +2.7V, unless otherwise noted.
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ADS7830 SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 www.ti.com TIMING CHARACTERISTICS(1) (continued) At TA = –40°C to +125°C and +VDD = +2.7V, unless otherwise noted. PARAMETER Data Hold Time SYMBOL tHD; DAT CONDITIONS MIN MAX UNIT Standard Mode 0 3.45 µs Fast Mode 0 0.9 µs High-Speed Mode, CB = 100pF max (3) 0 (4) 70 ns High-Speed Mode, CB = 400pF max (3) 0 (4) 150 ns Standard Mode Rise Time of SCL Signal tRCL 1000 ns Fast Mode 20 + 0.
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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 TYPICAL CHARACTERISTICS At TA = +25°C, VDD = +2.7V, VREF = External +2.5V, and fSAMPLE = 50kHz, unless otherwise noted. INTEGRAL LINEARITY ERROR vs CODE (2.5V Internal Reference) FFT vs FREQUENCY 0.5 0 0.4 0.3 0.2 ILE (LSB) Amplitude (dB) -20 -40 -60 0.1 0 -0.1 -0.2 -0.3 -80 -0.4 -0.5 -100 0 10 20 25 0 64 128 Output Code 192 255 Figure 1. Figure 2. DIFFERENTIAL LINEARITY ERROR vs CODE (2.
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ADS7830 SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VDD = +2.7V, VREF = External +2.5V, and fSAMPLE = 50kHz, unless otherwise noted. CHANGE IN GAIN vs TEMPERATURE INTERNAL REFERENCE vs TEMPERATURE 0.10 2.51875 Internal Reference (V) Delta from 25°C (LSB) 2.51250 0.05 0 -0.05 2.50625 2.50000 2.49375 2.48750 2.48125 -0.10 -50 0 -25 25 50 75 100 -50 0 -25 Temperature (°C) Figure 7.
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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 THEORY OF OPERATION REFERENCE The ADS7830 is a classic Successive Approximation Register (SAR) A/D converter. The architecture is based on capacitive redistribution which inherently includes a sampleand- hold function. The converter is fabricated on a 0.6µ CMOS process. The ADS7830 can operate with an internal 2.5V reference or an external reference.
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ADS7830 SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 www.ti.com DIGITAL INTERFACE The ADS7830 supports the I2C serial bus and data transmission protocol, in all three defined modes: standard, fast, and high-speed. A device that sends data onto the bus is defined as a transmitter, and a device receiving data as a receiver. The device that controls the message is called a “master.” The devices that are controlled by the master are “slaves.
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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 SDA MSB Slave Address R/W Direction Bit Acknowledgement Signal from Receiver Acknowledgement Signal from Receiver 1 SCL 2 6 7 8 9 1 2 3-8 8 9 ACK ACK START Condition STOP Condition or Repeated START Condition Repeated If More Bytes Are Transferred Figure 14.
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ADS7830 SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 www.ti.com Table 2.
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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 READING IN F/S MODE At the end of reading conversion data the ADS7830 can be issued a repeated START condition by the master to secure bus operation for subsequent conversions of the A/D converter. This would be the most efficient way to perform continuous conversions. Figure 15 describes the interaction between the master and the slave ADS7830 in Fast or Standard (F/S) mode.
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ADS7830 SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 www.ti.com READING IN HS MODE See Figure 16 for a typical read sequence for HS mode. Included in the read sequence is the shift from F/S to HS modes. It may be desirable to remain in HS mode after reading a conversion; to do this, issue a repeated START instead of a STOP at the end of the read sequence, since a STOP causes the part to return to F/S mode. High Speed (HS) mode is fast enough that codes can be read out one at a time.
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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 READING WITH REFERENCE ON/OFF The internal reference defaults to off when the ADS7830 power is on. To turn the internal reference on or off, see Table 1. If the reference (internal or external) is constantly turned on and off, a proper amount of settling time must be added before a normal conversion cycle can be started. The exact amount of settling time needed varies depending on the configuration.
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ADS7830 SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 www.ti.
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ADS7830 www.ti.com SBAS302C – DECEMBER 2003 – REVISED OCTOBER 2012 REVISION HISTORY Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision B (April 2008) to Revision C Page • Extended specified temperature range from –40°C to +85°C to –40°C to +125°C throughout document .......................... 1 • Changed operating temperature range maxmimum value in Absolute Maximum Ratings table .........................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 17-Oct-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant ADS7830IPWR TSSOP PW 16 2500 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 ADS7830IPWT TSSOP PW 16 250 180.0 12.4 6.9 5.6 1.6 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 17-Oct-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) ADS7830IPWR TSSOP PW 16 2500 367.0 367.0 35.0 ADS7830IPWT TSSOP PW 16 250 210.0 185.0 35.
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