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 is a functional upgrade candidate for the ADS1230IPW, offering a higher-resolution 24-bit delta-sigma ADC with an integrated PGA, dual matched current sources, and an SPI interface in the same TSSOP-16 footprint. While the core ADC architecture and supply domain align, designers must validate the digital interface timing, register configuration, and analog front-end settings, since the ADS1220 is register-programmable rather than pin-strapped like the ADS1230.
Resolution and ADC Architecture
High match
Package and Pin Footprint
High match
Digital Interface and Configuration
Validation required
Analog Front-End and Input Range
Validation required
Parts at a glance
Part B
ADS1230IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2859 Stückzahl
- Package
- TSSOP-16
- 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 | ADS1230IPW | ADS1220IPW | Why it matters |
|---|---|---|---|
| Resolution (bits) | 20 | 24 | Higher resolution enables finer measurement of small signal changes, which is critical for precision sensor and bridge applications. |
| Number of input channels | 1 (differential) | 4 (2 differential / 4 single-ended) | More channels allow multiplexing of multiple sensors without external switching hardware, reducing system complexity. |
| Input type | Differential only | Differential or single-ended | Single-ended support broadens compatibility with sensors referenced to ground, while differential improves noise rejection. |
| Programmable gain amplifier (PGA) | Fixed gain of 128 | Programmable gain 1 to 128 | A programmable PGA lets the same part handle a wide range of sensor signal amplitudes without external amplification. |
| Data rate (SPS) | 10 or 80 | Up to 2000 | Higher maximum sample rates support faster-responding control loops and dynamic measurements. |
| Digital interface | SPI-compatible (read-only) | SPI (read/write, configurable) | A read/write configurable interface allows runtime reconfiguration of gain, rate, and channel selection. |
| Internal oscillator | Yes (on-chip) | Yes (on-chip) | An internal oscillator eliminates the need for external clock components, simplifying the design. |
| Supply voltage range | 2.7 V to 5.3 V | 2.3 V to 5.5 V | A wider supply range offers more flexibility with battery-powered and low-voltage systems. |
| Package | 16-pin TSSOP | 16-pin TSSOP | Identical package and pin count can simplify board layout changes, though pinout must still be verified. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +125 °C | A wider temperature range supports industrial and harsh-environment applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1220IPW | ADS1230IPW |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 20 |
| Sampling Rate(Per Second) | 2k | 80 |
| Number of Inputs | 2, 4 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | PGA-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 ~ 5.3V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 2.7V ~ 5.3V |
| Features | PGA, Temperature Sensor | PGA |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary functional differences between the ADS1230IPW and ADS1220IPW?
The ADS1230IPW is a 20-bit delta-sigma ADC designed primarily for weigh-scale and bridge-sensor applications, offering a fixed gain of 64 or 128 and a maximum data rate of 80 SPS. The ADS1220IPW is a 24-bit delta-sigma ADC with a flexible input multiplexer (4 single-ended or 2 differential inputs), a programmable gain amplifier (gain 1 to 128), and programmable data rates from 5 SPS to 2000 SPS, making it suitable for a broader range of sensor measurement applications.
Are the ADS1230IPW and ADS1220IPW pin-compatible?
No. Both devices are offered in a 16-pin TSSOP (PW) package, but their pin functions and internal signal routing differ. The ADS1230IPW provides a dedicated differential input pair with fixed gain settings, while the ADS1220IPW exposes a multiplexer, external reference inputs, and SPI-configurable registers on its pins. A direct drop-in replacement is not possible without PCB and firmware changes.
How do the resolution and data rates of the ADS1230IPW and ADS1220IPW compare?
The ADS1230IPW provides 20-bit resolution with a fixed 10 SPS or 80 SPS output data rate (selectable). The ADS1220IPW provides 24-bit resolution with programmable data rates of 5, 20, 45, 90, 175, 330, 600, 1000, and 2000 SPS. The ADS1220IPW therefore offers higher resolution and a wider, more flexible range of output data rates.
Do both devices support SPI communication?
No. The ADS1230IPW uses a simple two-wire serial interface (SCLK and DOUT/DRDY) for data retrieval and does not support register configuration over SPI. The ADS1220IPW uses a full SPI-compatible interface (CS, SCLK, DIN, DOUT/DRDY) that allows read and write access to configuration registers, including PGA gain, data rate, input multiplexer, and reference selection.
What are the supply voltage requirements for the ADS1230IPW and ADS1220IPW?
Both devices operate from a single analog supply (AVDD) in the range of 2.7 V to 5.5 V and a digital supply (DVDD) in the range of 2.7 V to 5.5 V, per their respective manufacturer datasheets. The ADS1220IPW additionally supports an internal reference and has specified performance characteristics across this supply range for its PGA and multiplexer functions.
Can the ADS1220IPW be used as a replacement for the ADS1230IPW in an existing weigh-scale design?
Not as a direct drop-in replacement. While both are delta-sigma ADCs suitable for bridge sensors, the ADS1220IPW requires firmware changes to configure its SPI registers (gain, data rate, multiplexer, reference) and PCB changes to accommodate its different pin functions. The ADS1230IPW's fixed-gain, two-wire interface design is simpler, whereas the ADS1220IPW offers greater flexibility at the cost of additional configuration complexity.
What reference options are available on the ADS1230IPW and ADS1220IPW?
The ADS1230IPW uses an external differential reference input (REFP/REFN) and does not include an internal reference. The ADS1220IPW supports selectable reference sources including an internal 2.048 V reference, an external reference, and the analog supply (AVDD) as reference, configurable via its SPI registers.