ADS1235 ADC Datasheet

ADS1235 Datasheet, PDF, Equivalent


Part Number

ADS1235

Description

24-Bit Delta-Sigma ADC

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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ADS1235
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ADS1235
SBAS824 – OCTOBER 2018
ADS1235 Precision, 3-Channel, Differential-Input, 7200-SPS, 24-Bit
Delta-Sigma ADC for Bridge Sensors
1 Features
1 24-Bit, High-Precision ADC
– 120,000 Noise-Free Counts
(10-mV Input, 10 SPS)
– Offset Drift: 1 nV/°C
– Gain Drift: 0.5 ppm/°C
• Three Differential or Five Single-Ended Inputs
• Two Reference Inputs
• Wide Input Voltage Range: ±7 mV to ±5 V
• Low-Noise PGA, Gain: 1, 64, and 128
• Data Rate: 2.5 SPS to 7200 SPS
• AC- or DC-Bridge Excitation Option
• Chop Mode for Zero Drift Operation
• Simultaneous 50-Hz and 60-Hz Rejection Mode
• Single-Cycle Settling Mode
• Missing Reference Input Monitor
• Signal Overrange Monitor
• Temperature Sensor
• Cyclic Redundancy Check (CRC)
• 5-V or ±2.5-V Power Supply
2 Applications
• Weigh Scales and Strain-Gauge Digitizers
• Dynamic Weigh Systems
• Pressure Measurement
• Process Analytics
3 Description
The ADS1235 is a precision, 7200-SPS, delta-sigma
(ΔΣ) analog-to-digital converter (ADC) with an
integrated programmable gain amplifier (PGA). This
device also includes diagnostic features such as PGA
overrange and reference monitors. The ADC provides
high-accuracy, zero-drift conversion data for high-
precision equipment, including weigh scales, strain
gauges, and resistive pressure sensors.
The ADC has signal and reference multiplexers that
support three differential signal inputs and two
reference inputs. The ADC also includes a low-noise
PGA that provides gains of 1, 64, and 128. The ADC
also has a 24-bit ΔΣ modulator and programmable
digital filter.
The high-impedance inputs (1 GΩ) of the PGA
reduce measurement error that is caused by sensor
loading.
The ADC supports ac-bridge excitation to remove the
drift errors from the sensor wiring. The ADC provides
the clock control signals for the ac-excitation
operation.
The flexible digital filter is programmable for single-
cycle settled conversions, and provides 50-Hz and
60-Hz line cycle rejection at the same time.
The ADS1235 is available in a 5-mm × 5-mm QFN
package, and is specified across the –40°C to
+125°C temperature range.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS1235
VQFN (32)
5.0 mm × 5.0 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
REFP0
REFN0
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
GPIO
AC-Exc
Block Diagram
5 V (A)
3 V ± 5 V (D)
Ref
Mux
Input
Mux
ADS1235
Temp
Sensor
Buf
Internal
Oscillator
Ref
Monitor
PGA
24-Bit
û ADC
Digital
Filter
PGA
Monitor
Clock
Mux
Serial
Interface
and
Control
CLKIN
START
RESET
PWDN
CS
DIN
DOUT/DRDY
SCLK
DRDY
(A) (D)
1
ADC Conversion Noise
10009.65
10009.6
10 SPS
VIN = 10 mV
VN = 0.084 PV P-P
10009.55
10009.5
10009.45
10009.4
10009.35
0
10 20 30 40
Time (s)
50
60
D109
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

ADS1235
ADS1235
SBAS824 – OCTOBER 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 6
6.6 Timing Requirements ................................................ 8
6.7 Switching Characteristics .......................................... 9
6.8 Typical Characteristics ............................................ 12
7 Parameter Measurement Information ................ 17
7.1 Noise Performance ................................................. 17
8 Detailed Description ............................................ 19
8.1 Overview ................................................................. 19
8.2 Functional Block Diagram ....................................... 20
8.3 Feature Description................................................. 21
8.4 Device Functional Modes........................................ 32
8.5 Programming........................................................... 39
8.6 Register Map........................................................... 48
9 Application and Implementation ........................ 59
9.1 Application Information............................................ 59
9.2 Typical Application .................................................. 63
9.3 Initialization Setup ................................................... 65
10 Power Supply Recommendations ..................... 66
10.1 Power-Supply Decoupling..................................... 66
10.2 Analog Power-Supply Clamp ................................ 66
10.3 Power-Supply Sequencing.................................... 66
11 Layout................................................................... 67
11.1 Layout Guidelines ................................................. 67
11.2 Layout Example .................................................... 67
12 Device and Documentation Support ................. 68
12.1 Documentation Support ........................................ 68
12.2 Receiving Notification of Documentation Updates 68
12.3 Community Resources.......................................... 68
12.4 Trademarks ........................................................... 68
12.5 Electrostatic Discharge Caution ............................ 68
12.6 Glossary ................................................................ 68
13 Mechanical, Packaging, and Orderable
Information ........................................................... 68
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE
October 2018
REVISION
*
NOTES
Initial release.
2 Submit Documentation Feedback
Product Folder Links: ADS1235
Copyright © 2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity ADS1235 SBAS824 – OCTOBER 201 8 ADS1235 Precision, 3-Channel, Differe ntial-Input, 7200-SPS, 24-Bit Delta-Sig ma ADC for Bridge Sensors 1 Features 1 24-Bit, High-Precision ADC – 120, 000 Noise-Free Counts (10-mV Input, 10 SPS) – Offset Drift: 1 nV/°C – Gai n Drift: 0.5 ppm/°C • Three Differen tial or Five Single-Ended Inputs • Tw o Reference Inputs • Wide Input Volta ge Range: ±7 mV to ±5 V • Low-Noise PGA, Gain: 1, 64, and 128 • Data Rat e: 2.5 SPS to 7200 SPS • AC- or DC-Br idge Excitation Option • Chop Mode fo r Zero Drift Operation • Simultaneous 50-Hz and 60-Hz Rejection Mode • Sin gle-Cycle Settling Mode • Missing Ref erence Input Monitor • Signal Overran ge Monitor • Temperature Sensor • C yclic Redundancy Check (CRC) • 5-V or ±2.5-V Power Supply 2 Applications Weigh Scales and Strain-Gauge Digitiz ers • Dynamic Weigh Systems • Pressure Measurement • Process Analytics 3 Description The ADS1235 is a preci.
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