Part A
ADS1230IPW
Техасские инструменты
- Lifecycle
- Active
- Stock
- 2859 ПКС
- Package
- TSSOP-16
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1230IPW and ADS1222IPWRG4 are not drop-in replacements for each other. Although both are 24-bit delta-sigma analog-to-digital converters in TSSOP packages, they differ in resolution architecture, input channel configuration, interface timing, and reference/supply requirements, so a direct board-level substitution is not feasible without design validation.
Different input channel configuration
Different data interface timing
Different reference architecture
Different supply and gain setup
Parts at a glance
Part B
ADS1222IPWRG4
Техасские инструменты
- Lifecycle
- Active
- Stock
- 4722 ПКС
- Package
- TSSOP-14
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS1222IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 20 | 24 | Higher resolution allows detection of smaller signal changes, which is critical for precision measurement applications. |
| Number of input channels | 1 (differential) | 2 (differential) | More channels allow multiple sensors to be interfaced without external multiplexing, affecting system complexity and cost. |
| Interface type | SPI (2-wire, read-only) | SPI (4-wire) | Interface compatibility determines whether the part can drop into an existing digital bus design without firmware or wiring changes. |
| Data rate (SPS) | 10 or 80 | Up to 105 | Data rate affects measurement throughput and noise trade-off; different rates may not meet timing requirements of the target system. |
| Supply voltage range | 2.7 V to 5.3 V | 2.7 V to 5.5 V | Supply range must cover the system rail; a narrower range may limit operation at higher supply voltages. |
| Package | 16-TSSOP | 16-TSSOP | Package footprint and pinout determine PCB layout compatibility for direct substitution. |
| Internal PGA gain | 128 (fixed) | 1 to 128 (programmable) | Programmable gain allows adaptation to different sensor signal amplitudes, while a fixed gain restricts input range flexibility. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +105 °C | Wider temperature range supports use in harsher environments and provides margin in industrial applications. |
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 | ADS1230IPW | ADS1222IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 20 | 24 |
| Sampling Rate(Per Second) | 80 | 240 |
| Number of Inputs | 1 | 2 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | PGA-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.3V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.3V | 2.7V ~ 5.5V |
| Features | PGA | Temperature Sensor |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary functional differences between the ADS1230IPW and ADS1222IPWRG4?
The ADS1230IPW is a 20-bit delta-sigma analog-to-digital converter designed specifically for weigh scales and bridge sensors, featuring a low-noise PGA with gains of 1, 2, 64, and 128. The ADS1222IPWRG4 is a 24-bit delta-sigma ADC with a flexible input multiplexer, internal oscillator, and programmable gain amplifier, intended for general-purpose precision measurement applications. The ADS1230 integrates a dedicated bridge excitation switch and is optimized for direct thermocouple and load-cell interfacing, while the ADS1222 offers higher resolution and a wider input multiplexer configuration.
Are the ADS1230IPW and ADS1222IPWRG4 pin-compatible?
No. The ADS1230IPW is supplied in a 16-pin TSSOP package, while the ADS1222IPWRG4 is supplied in a 16-pin TSSOP package as well, but the pin functions and internal signal routing differ between the two devices. The ADS1230IPW pinout is dedicated to bridge sensor applications with fixed PGA settings and a specific clock/data interface, whereas the ADS1222IPWRG4 assigns pins to a multiplexer, external reference inputs, and a different digital interface. Direct PCB substitution is not possible without layout and firmware changes.
Which device offers higher resolution, and what is the effective resolution in bits?
The ADS1222IPWRG4 provides 24-bit resolution, while the ADS1230IPW provides 20-bit resolution. The ADS1230IPW achieves approximately 19.5 effective bits at a gain of 128 with a 10 SPS data rate, whereas the ADS1222IPWRG4 delivers up to 24 bits with programmable data rates and gain settings. The higher nominal resolution of the ADS1222IPWRG4 makes it suitable for applications requiring finer measurement granularity, while the ADS1230IPW is optimized for low-noise bridge measurements at lower resolution.
What are the maximum data rates supported by each converter?
The ADS1230IPW supports selectable data rates of 10 SPS and 80 SPS. The ADS1222IPWRG4 supports programmable data rates up to 2 kSPS depending on configuration and filter settings. The ADS1230IPW is intentionally limited to low data rates to achieve low noise for weigh-scale applications, while the ADS1222IPWRG4 offers higher throughput for general-purpose precision sensing.
Do both devices include an internal oscillator?
Yes. The ADS1230IPW includes an internal oscillator that provides the clock for the modulator and digital filter, eliminating the need for an external clock source in most applications. The ADS1222IPWRG4 also integrates an internal oscillator, with the option to use an external clock if required by the system design. Both devices can operate without an external crystal or oscillator in typical configurations.
What are the supply voltage and power consumption specifications for each device?
The ADS1230IPW operates from a single analog supply of 2.7 V to 5.3 V and a digital supply of 2.7 V to 5.3 V, with typical power consumption of approximately 1.5 mW at 3 V in normal mode and significantly lower in power-down mode. The ADS1222IPWRG4 operates from a single supply of 2.7 V to 5.5 V, with typical power consumption around 1.2 mW at 3 V depending on data rate and configuration. Both devices are suitable for low-power portable instrumentation, though exact consumption depends on selected gain, data rate, and supply voltage.
Which device is better suited for weigh-scale and bridge-sensor applications?
The ADS1230IPW is specifically designed for weigh-scale and bridge-sensor applications. It integrates a low-noise PGA with gain settings of 1, 2, 64, and 128, a dedicated bridge excitation switch, and a fixed 10 SPS or 80 SPS data rate optimized for low-noise load-cell measurements. The ADS1222IPWRG4 is a more general-purpose 24-bit ADC with a flexible multiplexer and programmable gain, which can be used in bridge applications but lacks the dedicated bridge-excitation control and fixed low-noise gain architecture of the ADS1230IPW. For direct load-cell interfacing with minimal external components, the ADS1230IPW is the more application-specific choice.
Can the ADS1222IPWRG4 replace the ADS1230IPW in an existing design without firmware changes?
No. The two devices use different digital interfaces and register maps. The ADS1230IPW uses a simple two-wire interface with a dedicated data-ready signal and fixed gain/rate settings selected by pin strapping. The ADS1222IPWRG4 uses a serial peripheral interface with command-based register configuration for gain, data rate, multiplexer selection, and operating mode. Replacing one with the other requires firmware modification, PCB layout changes, and revalidation of the analog front-end performance.