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Texas Instruments - ADS7844 Data Sheet Handbook User Guide

Summary

This highly efficient, 8-channel, 12-bit Analog-to-Digital Converter (ADC) features a synchronous serial interface and high-speed performance up to 200kHz. The comprehensive manual details system specifications, operational parameters for both single-ended and differential inputs, ensuring stable measurements from -40°C to +85°C. It is the ideal solution for battery-powered devices, digital assistants, portable data loggers, and industrial monitoring systems requiring low-power, high-accuracy remote data acquisition.

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ADS7844 ADS7844

ADS7844

SBAS100A – JANUARY 1998 – REVISED OCTOBER 2003

12-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER

FEATURES DESCRIPTION

SINGLE SUPPLY: 2.7V to 5V

The ADS7844 is an 8-channel, 12-bit sampling analog-to- 8-CHANNEL SINGLE-ENDED OR digital converter (ADC) with a synchronous serial interface. 4-CHANNEL DIFFERENTIAL INPUT Typical power dissipation is 3m W at a 200k Hz throughput rate and a +5V supply. The reference voltage (VREF) can be

UP TO 200k Hz CONVERSION RATE

varied between 100m V and VCC, providing a corresponding

±1 LSB MAX INL AND DNL

input voltage range of 0V to VREF. The device includes a NO MISSING CODES shutdown mode that reduces power dissipation to under 1µW. The ADS7844 is ensured down to 2.7V operation.

72d B SINAD

SERIAL INTERFACE Low power, high speed, and onboard multiplexer make the ADS7844 ideal for battery-operated systems such as personal

20-LEAD QSOP AND

digital assistants, portable multichannel data loggers, and

20-LEAD SSOP PACKAGES

measurement equipment. The serial interface also provides

ALTERNATE SOURCE FOR MAX147

low-cost isolation for remote data acquisition. The ADS7844 is available in a 20-lead QSOP package and the MAX147 APPLICATIONS equivalent 20-lead SSOP package and is ensured over the –40°C to +85°C temperature range.

DATA ACQUISITION TEST AND MEASUREMENT INDUSTRIAL PROCESS CONTROL PERSONAL DIGITAL ASSISTANTS BATTERY-POWERED SYSTEMS

CH1 SAR DCLK

Eight

Channel CS

CH4 Multiplexer Comparator

Serial SHDN

Interface

CDAC DIN

CH6 and

Control DOUT

COM BUSY

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.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date. Copyright © 1998-2003, Texas Instruments Incorporated 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

Page Summary Contents For Texas Instruments - ADS7844 Data Sheet Handbook User Guide

Page 1 ADS7844 ADS7844 ADS7844 SBAS100A – JANUARY 1998 – REVISED OCTOBER 2003 12-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER FEATURES DESCRIPTION SINGLE SUPPLY: 2.7V to 5V The ADS7844 i...
Page 2 SPECIFICATION: +5V At TA = –40°C to +85°C, +VCC = +5V, VREF = +5V, f SAMPLE = 200k Hz, and f CLK = 16 • f SAMPLE = 3.2MHz, unless otherwise noted. ADS7844E, N ADS7844EB, NB PARAMETER CONDITIONS MIN TY...
Page 3 SPECIFICATION: +2.7V At TA = –40°C to +85°C, +VCC = +2.7V, VREF = +2.5V, f SAMPLE = 125k Hz, and f CLK = 16 • f SAMPLE = 2MHz, unless otherwise noted. ADS7844E, N ADS7844EB, NB PARAMETER CONDITIONS MI...
Page 4 PACKAGE/ORDERING INFORMATION(1) MINIMUM RELATIVE MAXIMUM SPECIFIED ACCURACY GAIN ERROR TEMPERATURE PACKAGE ORDERING TRANSPORT PRODUCT (LSB) (LSB) RANGE PACKAGE-LEAD DESIGNATOR NUMBER MEDIA, QUANTITY A...
Page 5 TYPICAL PERFORMANCE CURVES:+5V At TA = +25°C, +VCC = +5V, VREF = +5V, f SAMPLE = 200k Hz, and f CLK = 16 • f SAMPLE = 3.2MHz, unless otherwise noted. pl itu de d B ffe ct iv um be of its FREQUENCY SPE...
Page 6 TYPICAL PERFORMANCE CURVES:+2.7V ffe ct iv um be of its pl itu de d B At TA = +25°C, +VCC = +2.7V, VREF = +2.5V, f SAMPLE = 125k Hz, and f CLK = 16 • f SAMPLE = 2MHz, unless otherwise noted. nd IN d B...
Page 7 TYPICAL PERFORMANCE CURVES:+2.7V (CONT) At TA = +25°C, +VCC = +2.7V, VREF = +2.5V, f SAMPLE = 125k Hz, and f CLK = 16 • f SAMPLE = 2MHz, unless otherwise noted. el ta fr om ˚C LS IL LS up pl ur re nt ...
Page 8 TYPICAL PERFORMANCE CURVES (CONT) up pl ur re nt µA At TA = +25°C, +VCC = +2.7V, VREF = +2.5V, f SAMPLE = 125k Hz, and f CLK = 16 • f SAMPLE = 2MHz, unless otherwise noted. ef er en ce ur re nt µA REF...
Page 9 ANALOG INPUT THEORY OF OPERATION Figure 2 shows a block diagram of the input multiplexer on The ADS7844 is a classic successive approximation register the ADS7844. The differential input of the conver...
Page 10 Likewise, the noise or uncertainty of the digitized output will A2-A0 increase with lower LSB size. With a reference voltage of (shown 000B)(1) 100m V, the LSB size is 24µV. This level is below the CH...
Page 11 Bit 7 Bit 0 The SGL/DIF bit controls the multiplexer input mode: either (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 (LSB) single-ended (HIGH) or differential (LOW). In single-ended A2 A1 A0 SGL/DIF PD1 ...
Page 12 PD1 PD0 Description SYMBOL DESCRIPTION MIN TYP MAX UNITS Power-down between conversions. When each t ACQ Acquisition Time 1.5 µs conversion is finished, the converter enters a low t DS DIN Valid Prior...
Page 13 Data Format The ADS7844 output data is in straight binary format as shown in Figure 7. This figure shows the ideal output code f CLK = 16 • f SAMPLE for the given input voltage and does not include th...
Page 14 high power devices. The degree of error in the digital output The ADS7844 architecture offers no inherent rejection of depends on the reference voltage, layout, and the exact noise or voltage variatio...
Page 15 PACKAGE OPTION ADDENDUM www.ti.com 18-Jul-2006 PACKAGING INFORMATION Orderable Device Status Package Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Type Drawing Qty ADS7844E ACTIVE SSOP/...
Page 16 PACKAGE OPTION ADDENDUM www.ti.com 18-Jul-2006 (3) MSL, Peak Temp. The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Importan...
Page 18 MECHANICAL DATA MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001 DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE 28 PINS SHOWN Gage Plane Seating Plane 2,00 MAX 0,05 MIN 0,10 PINS ** DIM A MAX 6,506,50 7,50 8,50...
Page 19 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and servic...

Manual Details

Brand Texas Instruments
Pages 19
File Size 394.40 KB
Published July 22, 2026
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