Part A
ADS1220IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4062 Stückzahl
- Package
- TSSOP-16
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1220IPW and ADS1224IPWTG4 are both 24-bit delta-sigma ADCs in a TSSOP-16 package with an SPI-compatible serial interface, making them a viable functional replacement candidate. However, they differ in channel count, input architecture, and integrated features such as the PGA and internal oscillator, so the replacement is not a direct drop-in and requires validation against the target application's signal chain requirements.
Resolution
High match
Package Type
High match
Channel Count
Validation required
Input Architecture
Not compatible
Parts at a glance
Part B
ADS1224IPWTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4125 Stückzahl
- Package
- TSSOP-20
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1220IPW | ADS1224IPWTG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 4 (2 differential / 4 single-ended) | 2 differential | Channel count determines how many sensors or signal pairs can be measured; the ADS1220 offers more flexible input configurations. |
| Input type | Differential or single-ended | Differential only | Single-ended capability in the ADS1220 allows simpler sensor interfacing, while the ADS1224 requires differential signals. |
| PGA (programmable gain amplifier) | Yes, gain 1 to 128 | No | An integrated PGA enables direct amplification of small sensor signals, improving effective resolution for low-level inputs. |
| Data rate (max SPS) | 2000 SPS | 120 SPS | Higher sample rates support faster-changing signals; the ADS1220 is better suited for higher-speed measurement applications. |
| Interface | SPI | SPI | Both use SPI, so host microcontroller compatibility is similar for either device. |
| Supply voltage (analog) | 2.3 V to 5.5 V | 2.7 V to 5.5 V | The wider analog supply range of the ADS1220 allows operation at lower voltages, which can matter in battery-powered designs. |
| Internal reference | Yes | No (external reference required) | An internal reference simplifies design and reduces external component count; the ADS1224 requires an external reference. |
| Package | TSSOP-16 | TSSOP-20 | Different package pin counts and footprints affect PCB layout and drop-in substitutability. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | The wider temperature range of the ADS1220 supports more demanding industrial environments. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1220IPW | ADS1224IPWTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 2k | 240 |
| Number of Inputs | 2, 4 | 2 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal, Supply | External |
| Voltage - Supply, Analog | 2.3V ~ 5.5V, ±2.5 | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 2.7V ~ 5.5V |
| Features | PGA, Temperature Sensor | Temperature Sensor |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1220IPW and ADS1224IPWTG4?
The ADS1220IPW is a 24-bit, 4-channel, delta-sigma ADC with a programmable gain amplifier (PGA), internal 2.048-V reference, and SPI interface in a 16-pin TSSOP package. The ADS1224IPWTG4 is a 24-bit, 4-channel, delta-sigma ADC with a fixed-gain input buffer, external reference requirement, and SPI interface in a 20-pin TSSOP package. The ADS1220 integrates a PGA and internal reference, while the ADS1224 relies on external signal conditioning and reference.
Are the ADS1220IPW and ADS1224IPWTG4 pin-compatible?
No. The ADS1220IPW is supplied in a 16-pin TSSOP package, while the ADS1224IPWTG4 is supplied in a 20-pin TSSOP package. The different pin counts and pin functions prevent direct PCB footprint compatibility without a layout redesign.
Can the ADS1220IPW and ADS1224IPWTG4 be used interchangeably in an existing design?
No. Beyond package and pin differences, the ADS1220IPW includes an integrated PGA and internal 2.048-V reference, whereas the ADS1224IPWTG4 requires an external reference and provides a fixed-gain input buffer. Firmware, reference circuitry, and analog front-end design must be validated against the respective datasheets before any substitution.
What are the maximum sample rates of the ADS1220IPW and ADS1224IPWTG4?
The ADS1220IPW supports programmable data rates up to 2 kSPS in normal mode. The ADS1224IPWTG4 supports data rates up to 500 SPS. Designers requiring higher throughput should account for this difference when selecting between the two devices.
Do both devices support SPI communication?
Yes. Both the ADS1220IPW and ADS1224IPWTG4 provide an SPI-compatible serial interface for configuration and data readout. However, register maps, command sets, and timing parameters differ between the two devices, so firmware must be adapted accordingly.
What reference voltage options are available for each device?
The ADS1220IPW includes an internal 2.048-V reference and also supports external reference inputs. The ADS1224IPWTG4 requires an external reference voltage to be supplied by the system. Designs migrating between the two must account for this reference architecture difference.
What are the supply voltage requirements for the ADS1220IPW and ADS1224IPWTG4?
Both devices operate from an analog supply (AVDD) of 2.7 V to 5.5 V and a digital supply (DVDD) of 2.7 V to 5.5 V, per their respective manufacturer datasheets. Always confirm the exact supply and decoupling requirements in the latest datasheet revision before finalizing a design.
Which device is better suited for sensor applications requiring programmable gain?
The ADS1220IPW is better suited for applications requiring programmable gain because it integrates a PGA with selectable gains up to 128 V/V. The ADS1224IPWTG4 provides a fixed-gain input buffer and does not offer programmable gain, so external amplification would be required for low-level sensor signals.