ADS125H02 ADC Datasheet

ADS125H02 Datasheet, PDF, Equivalent


Part Number

ADS125H02

Description

Delta-Sigma ADC

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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ADS125H02
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ADS125H02
SBAS790C – OCTOBER 2018 – REVISED JUNE 2019
ADS125H02 ±20-V Input, 2-Channel, 40-kSPS, 24-Bit, Delta-Sigma ADC
With PGA and Voltage Reference
1 Features
1 ±20-V input, 24-bit delta-sigma ADC
• Programmable data rate: 2.5 SPS to 40 kSPS
• High-voltage, high-impedance PGA:
– Differential input range: up to ±20 V
– Programmable gain: 0.125 to 128
– Common-mode input voltage: up to ±15.5 V
– Input impedance: 1 GΩ (minimum)
• High-performance ADC:
– Input noise: 45 nVRMS (20 SPS)
– CMRR: 105 dB
– Normal-mode rejection at 50 Hz, 60 Hz: 95 dB
– Offset drift: 5 nV/°C
– Gain drift: 1 ppm/°C
– INL: 2 ppm
• Integrated features and diagnostics:
– 2.5-V reference: 3 ppm/°C drift
– Clock oscillator: 2.5% error (maximum)
– Excitation current sources
– GPIO to drive external mux
– Signal and reference voltage monitors
– Cyclic redundancy check (CRC)
• Power supplies:
– AVDD: 4.75 V to 5.25 V
– DVDD: 2.7 V to 5.25 V
– HVDD: ±5 V to ±18 V
• Operating temperature: –40°C to +125°C
• 5-mm × 5-mm VQFN package
2 Applications
• PLC analog input modules:
– Voltage (such as ±10 V or 0 V to 5 V)
– Current (such as 4 mA to 20 mA with shunt)
– Temperature (such as RTDs, thermocouples)
• Test and measurement:
– High common-mode voltage inputs
– Battery testing
– High-side current measurement
3 Description
The ADS125H02 is a ±20-V input, 24-bit, delta-sigma
(ΔΣ) analog-to-digital converter (ADC). The ADC
features a low-noise programmable gain amplifier
(PGA), an internal reference, clock oscillator, and
signal or reference out-of-range monitors.
The integration of a wide input range, ±18-V PGA and
an ADC into a single package reduces board area up
to 50% compared to discrete solutions.
Programmable gain of 0.125 to 128 (corresponding to
an equivalent input range from ±20 V to ±20 mV)
eliminates the need for an external attenuator or
external gain stages. 1-GΩ minimum input impedance
reduces error caused by sensor loading. Additionally,
the low noise and low drift performance allow direct
connections to bridge, resistance temperature
detector (RTD), and thermocouple sensors.
The digital filter attenuates 50-Hz and 60-Hz line
cycle noise for data rates 50 SPS or 60 SPS to
reduce measurement error. The filter also provides
no-latency conversion data for high data throughput
during channel sequencing.
The ADS125H02 is housed in a 5-mm × 5-mm VQFN
package and is fully specified over the –40°C to
+125°C temperature range.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS125H02
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Functional Block Diagram
15 V
REFP1/GPIO0
REFN1/GPIO1
GPIO2
GPIO3
IDAC1
IDAC2
AIN0
AIN1
AINCOM
GPIO
(5 V)
5V
Supply
Read
Temp
Sensor
Input
MUX
REFP0 REFN0 REFOUT
5 V (A)
2.5-V
Ref
ADS125H02
5 V (D)
PGA
Ref
MUX
Control
BUF
Monitor
24-Bit
û ADC
Digital
Filter
Serial
Interface
(CRC)
START
RESET
DRDY
CS1
CS2
DIN
DOUT/DRDY
SCLK
Monitor
Internal
Oscillator
Clock
Mux
CLKIN
-15 V
(A) (D)
1
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.

ADS125H02
ADS125H02
SBAS790C – OCTOBER 2018 – REVISED JUNE 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 6
7.4 Thermal Information .................................................. 6
7.5 Electrical Characteristics........................................... 7
7.6 Timing Requirements ................................................ 9
7.7 Switching Characteristics ........................................ 10
7.8 Typical Characteristics ............................................ 12
8 Parameter Measurement Information ................ 20
8.1 Noise Performance ................................................. 20
9 Detailed Description ............................................ 24
9.1 Overview ................................................................. 24
9.2 Functional Block Diagram ....................................... 25
9.3 Feature Description................................................. 26
9.4 Device Functional Modes........................................ 39
9.5 Programming........................................................... 45
9.6 Register Map........................................................... 53
10 Application and Implementation........................ 68
10.1 Application Information.......................................... 68
10.2 Typical Applications .............................................. 69
10.3 Initialization Setup ................................................. 73
11 Power Supply Recommendations ..................... 74
11.1 Power-Supply Decoupling..................................... 74
11.2 Analog Power-Supply Clamp ................................ 74
11.3 Power-Supply Sequencing.................................... 74
11.4 5-V to ±15-V DC-DC Converter ............................ 74
12 Layout................................................................... 75
12.1 Layout Guidelines ................................................. 75
12.2 Layout Example .................................................... 76
13 Device and Documentation Support ................. 77
13.1 Documentation Support ........................................ 77
13.2 Receiving Notification of Documentation Updates 77
13.3 Community Resources.......................................... 77
13.4 Trademarks ........................................................... 77
13.5 Electrostatic Discharge Caution ............................ 77
13.6 Glossary ................................................................ 77
14 Mechanical, Packaging, and Orderable
Information ........................................................... 77
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (April 2019) to Revision C
Page
• Deleted ADS125H01 from document ..................................................................................................................................... 1
• Changed Device Comparison Table....................................................................................................................................... 3
• Added Effective resolution parameter to Electrical Characteristics table ............................................................................... 7
• Added Offset Voltage Long-Term Drift curves to Typical Characteristics ........................................................................... 15
• Added Gain Long-Term Drift curves to Typical Characteristics .......................................................................................... 16
• Added Internal Reference Voltage Long-Term Drift curve to Typical Characteristics.......................................................... 17
• Added Oscillator Frequency Long-Term Drift curve to Typical Characteristics.................................................................... 19
• Changed Noise Performance section................................................................................................................................... 20
• Added effective resolution and noise-free resolution data in Noise Performance .............................................................. 23
• Changed sinc1, sinc3, sinc4, and sinc5 values and footnote in Conversion Latency Time table........................................ 40
• Changed start-conversion delay value from 0 µs to 50 µs in the Start-Conversion Delay section ...................................... 40
• Changed sinc mode values in Calibration Time table .......................................................................................................... 44
• Changed address 00h default value from xxh to 6xh in Register Map Summary table ....................................................... 53
• Changed reset value from xxh to 6xh in Device Identification (ID) Register........................................................................ 54
Changes from Revision A (January 2019) to Revision B
Page
• Changed status of ADS125H02 from Advance Information to Production Data .................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: ADS125H02
Copyright © 2018–2019, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity ADS125H02 SBAS790C – OCTOBER 2018 – REVISED JUNE 2019 ADS125H02 ± 20-V Input, 2-Channel, 40-kSPS, 24-Bit, Delta-Sigma ADC With PGA and Voltage R eference 1 Features •1 ±20-V input, 24-bit delta-sigma ADC • Programmabl e data rate: 2.5 SPS to 40 kSPS • Hig h-voltage, high-impedance PGA: – Diff erential input range: up to ±20 V – Programmable gain: 0.125 to 128 – Com mon-mode input voltage: up to ±15.5 V – Input impedance: 1 GΩ (minimum) High-performance ADC: – Input noise : 45 nVRMS (20 SPS) – CMRR: 105 dB Normal-mode rejection at 50 Hz, 60 Hz : 95 dB – Offset drift: 5 nV/°C – Gain drift: 1 ppm/°C – INL: 2 ppm Integrated features and diagnostics: – 2.5-V reference: 3 ppm/°C drift Clock oscillator: 2.5% error (maximum ) – Excitation current sources – GP IO to drive external mux – Signal and reference voltage monitors – Cyclic redundancy check (CRC) • Power supplies: – AVDD: 4.75 V to 5.25 V – DVDD: 2.7 .
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