ADS1220 - 24-Bit Low-Power ADC with PGA | Texas Instruments
MPN: ADS1220 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.62 | $5.62 |
| 10 | $5.06 | $50.60 |
| 100 | $4.12 | $412.00 |
| 500 | $3.42 | $1,710.00 |
| 1,000 | $2.89 | $2,890.00 |
ADS1220 Overview
An analog-to-digital converter (ADC) is an electronic component that converts continuous analog signals into discrete digital values, enabling microcontrollers and digital processors to interpret real-world physical quantities such as temperature, pressure, and strain. The ADS1220 belongs to the family of delta-sigma ADCs, which use oversampling and noise shaping to achieve high resolution (24 bits) and excellent noise performance. Within the signal chain hierarchy, the ADS1220 sits between the sensor and the digital host, often following a signal conditioning stage and preceding a microcontroller or DSP. Its integrated PGA and reference eliminate the need for external precision components, simplifying the design and improving overall accuracy.
Key features of the ADS1220 include a programmable gain from 1 V/V to 128 V/V, programmable data rates up to 2 kSPS, and up to 20 bits of effective resolution. It supports two differential or four single-ended inputs, and includes a 2.048 V reference with low drift. The device also provides simultaneous 50-Hz and 60-Hz rejection, which is critical for industrial applications where power-line noise is prevalent. The integrated temperature sensor and current sources enable direct RTD and thermocouple measurements without additional circuitry.
Technically, the ADS1220 uses a delta-sigma modulator followed by a digital filter, achieving high accuracy with minimal external components. The PGA allows small sensor signals to be amplified before conversion, improving signal-to-noise ratio. The device communicates via a 4-wire SPI interface, and includes a data-ready (DRDY) pin for synchronization. The low-power architecture, combined with a wide supply range, makes it versatile for both portable and industrial designs.
Typical applications include temperature measurement with RTDs and thermocouples, pressure and load-cell sensing, 4-20 mA loop-powered transmitters, and portable instrumentation. The ADS1220's low power consumption and integrated features make it particularly well-suited for field transmitters and battery-operated devices where power efficiency is critical.
When designing with the ADS1220, ensure proper decoupling of the AVDD and DVDD supplies, and place the reference bypass capacitor close to the REFP/REFN pins. The PGA gain and data rate settings should be chosen to balance resolution and speed for the specific sensor bandwidth. For best noise performance, use a low-noise reference and minimize digital switching noise near the analog inputs.
Drop-in alternatives for ADS1220 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADS1220 (same form factor and footprint) — differing in Resolution, Current Consumption, Effective Resolution, Input Channels, Integrated Reference.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS1220IPWR
✅ Drop-In✓ In Stock
$1.91 / Unit
View Datasheet →ADS1220IRVAT
✅ Drop-In📋 Reference alternative (not in catalog)
ADS124S08
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCT1220
✅ Drop-In📋 Reference alternative (not in catalog)
AD7793BRUZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.25 / Unit
View Datasheet →ADS1220 Maximum Ratings & Electrical Characteristics
| Resolution | 24 bits |
| Input Channels | 2 differential or 4 single-ended |
| Data Rate | Up to 2 kSPS |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Current Consumption | 120 μA (typ) in duty-cycle mode |
| Programmable Gain | 1 V/V to 128 V/V |
| Effective Resolution | Up to 20 bits |
| 50/60 Hz Rejection | Simultaneous |
| Integrated Reference | 2.048 V |
| Interface | SPI |
| Package Options | VQFN-16, TSSOP-16 |
| Operating Temperature Range | -40°C to +125°C |
| Integrated Features | PGA, voltage reference, current sources, temperature sensor |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
ADS1220 Pin Configuration
| Pin 1 | AVDD — Analog power supply |
| Pin 2 | AIN0 — Analog input 0 |
| Pin 3 | AIN1 — Analog input 1 |
| Pin 4 | AIN2 — Analog input 2 |
| Pin 5 | AIN3 — Analog input 3 |
| Pin 6 | AVSS — Analog ground |
| Pin 7 | REFP — Positive reference input |
| Pin 8 | REFN — Negative reference input |
| Pin 9 | DVDD — Digital power supply |
| Pin 10 | GND — Digital ground |
| Pin 11 | DRDY — Data ready output |
| Pin 12 | CS — Chip select input |
| Pin 13 | CLK — Serial clock input |
| Pin 14 | DIN — Serial data input |
| Pin 15 | DOUT — Serial data output |
| Pin 16 | VDD — Supply voltage |
Typical Applications
ADS1220 is suitable for 6 applications: Temperature Measurement (RTD), Load Cell and Pressure Sensing, 4-20 mA Loop-Powered Transmitters, Portable Instrumentation, Thermocouple Measurement, Weigh Scale and Force Sensing.
Temperature Measurement (RTD)
The ADS1220 is ideal for RTD temperature measurement due to its integrated current sources and PGA. It can directly excite the RTD and measure the voltage drop with high resolution. The device's low power consumption and 50/60 Hz rejection make it suitable for industrial temperature transmitters. With a 24-bit resolution and programmable gain up to 128 V/V, it can resolve small temperature changes accurately. The integrated reference enables ratiometric measurements, reducing errors from supply variations. This makes the ADS1220 a cost-effective solution for precision temperature sensing in process control and HVAC systems.
Recommended
Load Cell and Pressure Sensing
The ADS1220 is well-suited for load cell and pressure sensor applications. Its integrated PGA amplifies the small differential output from a Wheatstone bridge, and the 24-bit resolution provides high measurement accuracy. The device supports ratiometric measurements using the bridge excitation as the reference, eliminating the need for a separate reference. With data rates up to 2 kSPS, it can handle dynamic measurements. The low power consumption is beneficial for battery-powered scales and portable pressure gauges. The ADS1220's small package and integrated features reduce board space and component count, making it a popular choice for industrial weighing and pressure monitoring systems.
Recommended
4-20 mA Loop-Powered Transmitters
The ADS1220 is specifically designed for 4-20 mA loop-powered field transmitters. Its ultra-low power consumption (120 μA in duty-cycle mode) allows it to operate from the loop current without exceeding the 4 mA budget. The integrated PGA and reference enable direct connection to sensors like thermocouples and RTDs. The device's small package and wide supply range (2.3 V to 5.5 V) make it easy to integrate into loop-powered designs. The simultaneous 50/60 Hz rejection ensures accurate measurements in industrial environments with power-line noise. This makes the ADS1220 a preferred choice for smart transmitters in process automation.
Recommended
Portable Instrumentation
The ADS1220 is ideal for portable instrumentation due to its low power consumption and small footprint. It can be used in handheld multimeters, data loggers, and portable medical devices. The device operates from a single 3.3 V battery and consumes only 120 μA in duty-cycle mode, extending battery life. The integrated PGA and reference reduce external component count, saving board space. With a 24-bit resolution, it provides high accuracy for measuring small signals from sensors. The SPI interface allows easy connection to microcontrollers. The wide operating temperature range (-40°C to +125°C) makes it suitable for outdoor and industrial portable equipment.
Recommended
Thermocouple Measurement
The ADS1220 is well-suited for thermocouple measurement due to its integrated PGA and cold-junction compensation capability. The device can amplify the small thermocouple voltage (typically microvolts) with gains up to 128 V/V. The integrated temperature sensor can be used for cold-junction compensation, eliminating the need for an external sensor. The 24-bit resolution ensures accurate temperature readings over a wide range. The low power consumption is beneficial for battery-powered thermocouple readers. The device's SPI interface and small package make it easy to integrate into portable and industrial thermocouple instruments.
Recommended
Weigh Scale and Force Sensing
The ADS1220 is commonly used in weigh scales and force sensing applications. Its high resolution (24-bit) and integrated PGA allow precise measurement of load cell outputs. The device supports ratiometric measurements, using the excitation voltage as the reference, which simplifies the design and improves accuracy. With data rates up to 2 kSPS, it can handle dynamic weighing applications. The low power consumption is ideal for battery-operated scales. The small package and integrated features reduce the overall system cost. The ADS1220 is a reliable choice for industrial and consumer weighing systems.
Recommended
Recommended Products Summary
Engineering reference data for ADS1220 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS1220IPWR | ADS1220IRVAT | ADS124S08 | MCT1220 | AD7793BRUZ |
|---|---|---|---|---|---|---|
| Package | VQFN-16 or TSSOP-16 | TSSOP-16 | VQFN-16 | TSSOP-16 | TSSOP-16 | TSSOP-16 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Nanjing Modu Zhixin | Analog Devices |
| Resolution | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits | 24 bits |
| Data Rate | Up to 2 kSPS | Up to 2 kSPS | Up to 2 kSPS | Up to 4 kSPS | Up to 2 kSPS | Up to 470 SPS |
| Supply Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.7 V to 5.25 V |
| Current Consumption | 120 μA (typ) | 120 μA (typ) | 120 μA (typ) | 400 μA (typ) | 120 μA (typ) | 350 μA (typ) |
| Integrated PGA | Yes (1 to 128 V/V) | Yes (1 to 128 V/V) | Yes (1 to 128 V/V) | Yes (1 to 128 V/V) | Yes (1 to 128 V/V) | Yes (1 to 128 V/V) |
| 50/60 Hz Rejection | Simultaneous | Simultaneous | Simultaneous | Simultaneous | Simultaneous | Simultaneous |
Key Differentiators
- Ultra-low power consumption (vs AD7793BRUZ)
- Higher data rate (vs AD7793BRUZ)
- Smaller package options (vs ADS124S08)
Design Notes
The ADS1220 operates from 2.3 V to 5.5 V. Use separate analog and digital supplies (AVDD and DVDD) to minimize digital noise coupling into the analog section. Place 0.1 μF and 10 μF decoupling capacitors close to each supply pin. For best performance, use a low-noise LDO for AVDD.
For optimal noise performance, use a solid ground plane and separate analog and digital ground planes if possible. Keep analog input traces short and shielded. Place the reference bypass capacitor (0.1 μF) close to the REFP and REFN pins. Avoid routing digital signals near the analog inputs.
Ensure the input common-mode voltage is within the specified range for the selected PGA gain. For ratiometric measurements, use the same reference for the sensor excitation and the ADC reference to avoid errors. Do not exceed the absolute maximum ratings on any pin. For thermocouple measurements, use the internal temperature sensor for cold-junction compensation.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified.
