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ADS1120IPW
Texas Instruments
IC ADC 16BIT SIGMA-DELTA 16TSSOP
300425 Pcs New Original In Stock
16 Bit Analog to Digital Converter 2, 4 Input 1 Sigma-Delta 16-TSSOP
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5.0 / 5.0
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ADS1120IPW
Product Overview
1381653
DiGi Electronics Part Number
ADS1120IPW-DGManufacturer
Texas Instruments
ADS1120IPW
Description
IC ADC 16BIT SIGMA-DELTA 16TSSOPInventory
300425 Pcs New Original In Stock
16 Bit Analog to Digital Converter 2, 4 Input 1 Sigma-Delta 16-TSSOP
Quantity
Minimum 1
Minimum 1
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ADS1120IPW Technical Specifications
Category
Data Acquisition, Analog to Digital Converters (ADC)
Packaging
Tube
Series
-
Product Status
Active
Number of Bits
16
Sampling Rate (Per Second)
2k
Number of Inputs
2, 4
Input Type
Differential, Single Ended
Data Interface
SPI
Configuration
MUX-PGA-ADC
Ratio - S/H:ADC
-
Number of A/D Converters
1
Architecture
Sigma-Delta
Reference Type
External, Internal, Supply
Voltage - Supply, Analog
2.3V ~ 5.5V
Voltage - Supply, Digital
2.3V ~ 5.5V
Features
PGA, Temperature Sensor
Operating Temperature
-40°C ~ 125°C
Package / Case
16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package
16-TSSOP
Mounting Type
Surface Mount
Base Product Number
ADS1120
Datasheet & Documents
Manufacturer Product Page
ADS1120IPW Specifications
HTML Datasheet
ADS1120IPW-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-39550-5
Standard Package
90
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
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de desembre 02, 2025
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de desembre 02, 2025
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de desembre 02, 2025
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de desembre 02, 2025
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the ADS1120IPW in a noisy industrial environment with long sensor leads?
When integrating the ADS1120IPW in noisy industrial environments with long sensor cables, the primary risks include increased electromagnetic interference (EMI) affecting the low-level analog signals, especially when using the internal PGA. The sigma-delta architecture is sensitive to high-frequency noise due to its oversampling nature. To mitigate this, use shielded twisted-pair cables, implement RC filtering at the ADC inputs (e.g., 10Ω series resistor and 100nF capacitor to ground), and leverage the ADS1120IPW's built-in digital filter with chop mode enabled for drift reduction. Additionally, route digital SPI lines away from analog traces and keep the reference source stable—preferably using an external precision reference if operating near the 16-bit resolution limit.
How does the ADS1120IPW compare to the ADS1115 when selecting for a battery-powered sensor node requiring low power and internal PGA?
The ADS1120IPW offers significant advantages over the ADS1115 in system-level integration and power efficiency for battery-powered applications. While both include an internal PGA, the ADS1120IPW supports lower current consumption in duty-cycled mode (down to 20 µA at 1 SPS) and provides a programmable digital filter, internal temperature sensor, and better noise performance. The ADS1120IPW also features a flexible mux allowing four differential or seven single-ended inputs, compared to the ADS1115’s four single-ended/four differential inputs. However, the ADS1115 uses a smaller 10-MSOP package. For space-constrained designs where minimal external components are critical, the ADS1120IPW's SPI interface requires more GPIOs than the ADS1115’s I2C, but offers faster throughput and better noise immunity—making the ADS1120IPW a superior choice when reliability and precision are prioritized over pin count.
Can the internal reference of the ADS1120IPW be used reliably in a wide temperature range without sacrificing accuracy?
The internal reference of the ADS1120IPW has a typical drift of 10 ppm/°C and is suitable for many precision applications across the full industrial temperature range (-40°C to 125°C). However, for designs demanding stable absolute measurements—such as strain gauge or RTD sensing—using the internal reference may introduce gain errors over temperature due to combined drift with the PGA. To ensure long-term accuracy, especially in outdoor or uncontrolled environments, pair the ADS1120IPW with an external ultra-low-drift reference like the REF5025 (2.5V, 3 ppm/°C). Alternatively, use ratiometric sensing where the sensor excitation and ADC reference share the same source (e.g., AVDD), minimizing drift impact. This is particularly effective in load cell or bridge sensor applications.
What are the implications of using a single 3.3V supply for both analog and digital domains of the ADS1120IPW in a mixed-signal PCB layout?
Using a shared 3.3V supply for both analog and digital domains of the ADS1120IPW can lead to degraded signal integrity due to digital switching noise coupling into the analog section, especially in high-precision measurements. To mitigate this risk, use a ferrite bead or small LC filter to separate the AVDD and DVDD pins, even when sourced from the same regulator. Additionally, ensure a solid ground plane with minimized splits and place 100nF ceramic capacitors close to each supply pin (AVDD, DVDD, and REFPx). Avoid routing digital SPI lines under the ADS1120IPW package to prevent coupling. For noise-sensitive applications like thermocouple or ECG front-ends, consider using a separate LDO for AVDD to enhance PSRR and maintain the 16-bit performance of the sigma-delta ADC.
Is the ADS1120IPW a viable drop-in replacement for the LTC2485 in a high-resolution weigh scale design, and what layout and firmware changes are required?
The ADS1120IPW can serve as a functional alternative to the LTC2485 in high-resolution weigh scale applications, but it is not a direct drop-in replacement due to interface and configuration differences. The LTC2485 uses a proprietary 2-wire DACK/SDA interface, while the ADS1120IPW relies on standard SPI, requiring firmware redesign for command sequencing and data retrieval. Additionally, the ADS1120IPW offers programmable gain up to 128V/V and integrated multiplexing, enabling multi-load cell support, which the LTC2485 lacks. However, the LTC2485 has better inherent noise performance (0.6µV RMS) vs. ~0.8µV RMS typical for ADS1120IPW at gain 128. To maintain accuracy, update the PCB layout to accommodate the 16-TSSOP footprint, ensure tight thermal coupling between the ADS1120IPW and load cell amplifier, and implement SPI clock gating during active measurement phases to minimize digital crosstalk. Enable the ADS1120IPW's internal temperature sensor for drift compensation algorithms in software.
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ADS1120IPW CAD Models
Texas Instruments ADS1120IPW PCB symbols & footprints
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