Part A
ADS1220IPW
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 4062 PCS
- Package
- TSSOP-16
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1222IPWRG4 is a functionally compatible replacement candidate for the ADS1220IPW, sharing the same 24-bit delta-sigma ADC architecture, TSSOP-16 footprint, and SPI interface, though the ADS1220IPW offers a wider supply range, higher programmable gain settings, and an integrated PGA that the ADS1222IPWRG4 does not provide. Designers should validate supply voltage, gain configuration, and input signal conditioning requirements before substituting.
Resolution and ADC Architecture
High match
Package Type
High match
Supply Voltage Range
Validation required
Programmable Gain Amplifier
Not compatible
Parts at a glance
Part B
ADS1222IPWRG4
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 4722 PCS
- Package
- TSSOP-14
- Series
- 데이터 수집 - 아날로그 변환기(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 | ADS1222IPWRG4 | 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 (2 differential) | Channel count determines how many sensors or signal pairs can be measured; the ADS1220 supports more inputs than the ADS1222. |
| Interface | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible between the two parts. |
| PGA / gain stage | Integrated PGA (gain 1 to 128) | No integrated PGA | An integrated PGA allows direct amplification of small sensor signals; the ADS1222 lacks this, requiring external amplification for low-level inputs. |
| Internal reference | Yes (2.048 V) | No (external reference required) | An internal reference simplifies design and reduces external components; the ADS1222 needs an external voltage reference. |
| Data rate (SPS) | Up to 2000 SPS | Up to 105 SPS | Higher sample rates enable faster signal acquisition; the ADS1220 is significantly faster than the ADS1222. |
| Supply voltage range | 2.7 V to 5.5 V (analog), 2.3 V to 5.5 V (digital) | 2.7 V to 5.5 V | Supply range affects compatibility with system rails; both operate over similar ranges but the ADS1220 specifies separate analog and digital rails. |
| Package | TSSOP-16 | TSSOP-16 | Identical package and pin count allow potential board-level drop-in compatibility, though pin functions must be verified. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | The wider temperature range of the ADS1220 suits harsher environments, while the ADS1222 is limited to standard industrial ranges. |
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 | ADS1222IPWRG4 |
|---|---|---|
| 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 ADS1222IPWRG4?
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, housed in a 16-pin TSSOP (PW) package. The ADS1222IPWRG4 is a 24-bit, 2-channel, delta-sigma ADC with a fixed gain of 1 to 128, an internal oscillator, and a two-wire serial interface, supplied in a 16-pin TSSOP (PW) package in tape-and-reel form with a Green (G4) designation. The ADS1220 integrates a PGA and reference, while the ADS1222 relies on external gain and reference configuration.
Are the ADS1220IPW and ADS1222IPWRG4 pin-compatible and directly interchangeable?
No. Although both devices are offered in a 16-pin TSSOP (PW) package, their pin functions and internal architectures differ. The ADS1220IPW provides a 4-channel input multiplexer, PGA, and SPI interface, whereas the ADS1222IPWRG4 provides a 2-channel input and a two-wire serial interface. Pin assignments and external component requirements are not identical, so a direct drop-in substitution is not supported without schematic and layout verification against the respective datasheets.
How do the input channel counts and PGA capabilities compare?
The ADS1220IPW offers a 4-channel input multiplexer with a low-noise PGA supporting gains from 1 to 128, suitable for direct sensor interfacing. The ADS1222IPWRG4 provides a 2-channel input with selectable gain of 1 to 128 but does not include an integrated PGA in the same configuration as the ADS1220. Designs requiring four differential or single-ended inputs should select the ADS1220IPW, while two-channel applications may consider the ADS1222IPWRG4.
What are the differences in reference and oscillator requirements?
The ADS1220IPW includes an internal 2.048-V reference and an internal oscillator, reducing external component count. The ADS1222IPWRG4 also integrates an internal oscillator but requires an external reference voltage for ratiometric or absolute measurements. Designs migrating between the two devices must account for reference source changes and associated noise and drift performance.
How do the digital interfaces differ between the ADS1220IPW and ADS1222IPWRG4?
The ADS1220IPW uses a four-wire SPI-compatible interface (CS, SCLK, DIN, DOUT/DRDY), supporting daisy-chain and multiple device configurations. The ADS1222IPWRG4 uses a two-wire serial interface for data output and control. Firmware and host microcontroller interface code are therefore not interchangeable and must be rewritten when switching between the two devices.
What are the package and ordering differences between ADS1220IPW and ADS1222IPWRG4?
Both devices are supplied in a 16-pin TSSOP (PW) package. The ADS1220IPW is typically ordered in tube form, while the ADS1222IPWRG4 suffix indicates tape-and-reel packaging (R) and a Green/RoHS-compliant (G4) designation. PCB land patterns are similar due to the shared package family, but pin functions differ, so layout reuse requires verification.
Which device is better suited for multi-channel precision sensor applications?
The ADS1220IPW is generally preferred for multi-channel precision sensor applications because it integrates a 4-channel input multiplexer, PGA, internal reference, and SPI interface in a single device, reducing board space and external components. The ADS1222IPWRG4 is better suited to simpler two-channel designs where an external reference is acceptable and a two-wire interface is sufficient.
Can the ADS1222IPWRG4 replace the ADS1220IPW in an existing design without firmware changes?
No. The differing channel count, interface protocol, and reference architecture mean that firmware, schematic, and layout changes are required. The ADS1220IPW's SPI interface and integrated reference are not directly compatible with the ADS1222IPWRG4's two-wire interface and external reference requirement. Replacement should only be attempted after full validation against both manufacturer datasheets.