ADS1263 Converter Datasheet

ADS1263 Datasheet PDF, Equivalent


Part Number

ADS1263

Description

Analog-to-Digital Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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ADS1263
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ADS1262, ADS1263
SBAS661B – FEBRUARY 2015 – REVISED JULY 2015
ADS126x 32-Bit, Precision, 38-kSPS, Analog-to-Digital Converter (ADC)
with Programmable Gain Amplifier (PGA) and Voltage Reference
1 Features
1 Precision, 32-bit, ΔΣ ADC
• Auxiliary 24-Bit, ΔΣ ADC (ADS1263)
• Data Rates: 2.5 SPS to 38400 SPS
• Differential Input, CMOS PGA
• 11 Multifunction Analog Inputs
• High-Accuracy Architecture
– Offset Drift: 1 nV/°C
– Gain Drift: 0.5 ppm/°C
– Noise: 7 nVRMS (2.5 SPS, Gain = 32)
– Linearity: 3 ppm
• 2.5-V Internal Voltage Reference
– Temperature Drift: 2 ppm/°C
• 50-Hz and 60-Hz Rejection
• Single-Cycle Settled Conversions
• Dual Sensor Excitation Current Sources
• Internal Fault Monitors
• Internal ADC Test Signal
• 8 General-Purpose Input/Outputs
3 Description
The ADS1262 and ADS1263 are low-noise, low-drift,
38.4-kSPS, delta-sigma (ΔΣ) ADCs with an integrated
PGA, reference, and internal fault monitors. The
ADS1263 integrates an auxiliary, 24-bit, ΔΣ ADC
intended for background measurements. The sensor-
ready ADCs provide complete, high-accuracy, one-
chip measurement solutions for the most-demanding
sensor applications, including weigh scales, strain-
gauge sensors, thermocouples, and resistance
temperature devices (RTD).
The ADCs are comprised of a low-noise, CMOS PGA
(gains 1 to 32), a ΔΣ modulator, followed by a
programmable digital filter. The flexible analog front-
end (AFE) incorporates two sensor-excitation current
sources suitable for direct RTD measurement.
A single-cycle settling digital filter maximizes multiple-
input conversion throughput, while providing 130-dB
rejection of 50-Hz and 60-Hz line cycle interference.
The ADS1262 and ADS1263 are pin and functional
compatible. These devices are available in a 28-pin
TSSOP package and are fully specified over the
–40°C to +125°C temperature range.
2 Applications
• High-Resolution PLCs
• Temperature, Pressure Measurement
• Weigh Scales and Strain-Gauge Digitizers
• Panel Meters, Chart Recorders
• Analytical Instrumentation
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS1262
ADS1263
TSSOP (28)
9.70 mm × 4.40 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
Temperature Compensated Bridge Measurement
Bridge
Pt 100
REFOUT
2.5-V Ref
+Exc
+Sen
+Sig
±Sig
±Sen
±Exc
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
AINCOM
GPIO
Level Shift
Temp Sensor
Test V
+5 V
AVDD
+3.3 V
DVDD
Ref ADS1262
Mux ADS1263
Dual Sensor
Excitation
Buf
Sensor Test
Ref
Alarm
Input
Mux
PGA
32-Bit
ûADC
Digital
Filter
Signal
Alarm
Serial
Interface
and
Control
PGA
24-Bit
ûADC
Digital
Filter
ADS1263 Only
AVSS
Internal
Oscillator
Clock
Mux
DGND
START
RESET/PWDN
CS
DIN
DOUT/DRDY
SCLK
DRDY
XTAL2
XTAL1/CLKIN
1
ADC Conversion Noise
0.25
0.2
0.15
Input Range = H78 mV
Data Rate = 20 SPS
Noise = 0.16 2VP-P
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
-0.25
01234567
Time (s)
8
9 10
D017
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.

ADS1263
ADS1262, ADS1263
SBAS661B – FEBRUARY 2015 – REVISED JULY 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison ............................................... 4
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 ESD Ratings.............................................................. 6
7.3 Recommended Operating Conditions....................... 7
7.4 Thermal Information .................................................. 7
7.5 Electrical Characteristics........................................... 8
7.6 Timing Requirements: Serial Interface.................... 11
7.7 Switching Characteristics: Serial Interface.............. 12
7.8 Typical Characteristics ............................................ 13
8 Parameter Measurement Information ................ 24
8.1 Offset Temperature Drift Measurement .................. 24
8.2 Gain Temperature Drift Measurement .................... 24
8.3 Common-Mode Rejection Ratio Measurement....... 24
8.4 Power-Supply Rejection Ratio Measurement ......... 24
8.5 Crosstalk Measurement (ADS1263) ....................... 25
8.6 Reference-Voltage Temperature-Drift
Measurement ........................................................... 25
8.7 Reference-Voltage Thermal-Hysteresis
Measurement ........................................................... 25
8.8 Noise Performance ................................................. 26
9 Detailed Description ............................................ 30
9.1 Overview ................................................................. 30
9.2 Functional Block Diagram ....................................... 31
9.3 Feature Description................................................. 32
9.4 Device Functional Modes....................................... 61
9.5 Programming.......................................................... 85
9.6 Register Maps ......................................................... 88
10 Application and Implementation...................... 106
10.1 Application Information........................................ 107
10.2 Typical Applications ............................................ 114
10.3 Dos and Don'ts.................................................... 119
10.4 Initialization Setup ............................................... 120
11 Power-Supply Recommendations ................... 122
11.1 Power-Supply Decoupling................................... 122
11.2 Analog Power-Supply Clamp .............................. 123
11.3 Power-Supply Sequencing.................................. 123
12 Layout................................................................. 124
12.1 Layout Guidelines ............................................... 124
12.2 Layout Example .................................................. 125
13 Device and Documentation Support ............... 126
13.1 Related Links ...................................................... 126
13.2 Community Resources........................................ 126
13.3 Trademarks ......................................................... 126
13.4 Electrostatic Discharge Caution .......................... 126
13.5 Glossary .............................................................. 126
14 Mechanical, Packaging, and Orderable
Information ......................................................... 126
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (May 2015) to Revision B
Page
• Changed ADS1263 from product preview to production data, and added text and specifications throughout data
sheet to include the ADS1263 and ADC2 .............................................................................................................................. 1
• Changed text throughout data sheet for clarity ...................................................................................................................... 1
• Added condition line to Absolute Maximum Ratings table ..................................................................................................... 6
• Added Crosstalk section to Electrical Characteristics table ................................................................................................... 9
• Added Figure 32 ................................................................................................................................................................... 17
• Added Figure 36 ................................................................................................................................................................... 18
• Changed legend in Figure 45 ............................................................................................................................................... 19
• Added missing gain term in FSR definition of Equation 8 .................................................................................................... 26
• Changed text in fourth paragraph of Noise Performance section to clarify conditions to achieve maximum ENOB ........... 26
• Changed bit names from PGAH and PGAL to PGAH_ALM and PGAL_ALM, respectively, in PGA Absolute Output-
Voltage Monitor section ........................................................................................................................................................ 40
• Changed Figure 77 to show correct name of bit 4 ............................................................................................................... 41
• Changed RMUX to RMUXP in second paragraph of ADC Reference Voltage section ....................................................... 41
• Changed text in last paragraph of ADC Reference Voltage section to show correct name of bit 4 .................................... 41
• Changed text in External Reference section to clarify external reference inputs, polarity reversal switch, reference
input current, and external reference buffer ......................................................................................................................... 42
• Changed text in Power-Supply Reference section to clarify use of power-supply reference in critical applications ........... 42
2 Submit Documentation Feedback
Product Folder Links: ADS1262 ADS1263
Copyright © 2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community ADS1262, ADS1263 SBAS661B FEBRUARY 2015 – REVISED JULY 2015 A DS126x 32-Bit, Precision, 38-kSPS, Anal og-to-Digital Converter (ADC) with Prog rammable Gain Amplifier (PGA) and Volta ge Reference 1 Features •1 Precision , 32-bit, ΔΣ ADC • Auxiliary 24-Bit , ΔΣ ADC (ADS1263) • Data Rates: 2. 5 SPS to 38400 SPS • Differential Inp ut, CMOS PGA • 11 Multifunction Analo g Inputs • High-Accuracy Architecture – Offset Drift: 1 nV/°C – Gain Dr ift: 0.5 ppm/°C – Noise: 7 nVRMS (2. 5 SPS, Gain = 32) – Linearity: 3 ppm • 2.5-V Internal Voltage Reference Temperature Drift: 2 ppm/°C • 50-H z and 60-Hz Rejection • Single-Cycle Settled Conversions • Dual Sensor Exc itation Current Sources • Internal Fa ult Monitors • Internal ADC Test Sign al • 8 General-Purpose Input/Outputs 3 Description The ADS1262 and ADS1263 are low-noise, low-drift, 38.4-kSPS, delta-sigma (ΔΣ) ADCs with an integrated PGA, reference, and internal fau.
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