Part A
ADS1222IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3095 Stückzahl
- Package
- TSSOP-14
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1230IPW and ADS1222IPWR are both 24-bit delta-sigma ADCs in TSSOP-16 packages, but they differ fundamentally in resolution architecture, input channel configuration, interface timing, and reference requirements. The ADS1230IPW is a single-channel, 20-bit effective bridge sensor ADC with a fixed 10 SPS or 80 SPS data rate and internal oscillator, while the ADS1222IPWR is a dual-channel, 24-bit ADC with programmable data rates and a different serial interface protocol. These differences in channel count, output data rate flexibility, and digital interface make direct substitution impractical without circuit and firmware redesign.
Different channel count
Different data rate architecture
Different interface protocol
Different reference configuration
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 | ADS1222IPWR | 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) | 2 (differential) | Channel count determines how many independent signal sources can be measured without external multiplexing. |
| Input type | Differential | Differential | Differential inputs reject common-mode noise, improving accuracy in electrically noisy environments. |
| Data rate (SPS) | 10 or 80 | Up to 105 | Data rate affects measurement speed and noise trade-off; faster rates suit dynamic signals while slower rates improve noise performance. |
| Interface | SPI (2-wire, read-only) | SPI (2-wire) | The digital interface must match the host microcontroller's capabilities for direct communication. |
| Supply voltage (V) | 2.7 to 5.5 | 2.7 to 5.5 | Supply range determines compatibility with the system power rail and low-voltage operation. |
| Internal PGA gain | 1, 2, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 | Programmable gain allows small sensor signals to be amplified for full-scale conversion without external amplifiers. |
| Package | 16-TSSOP | 16-TSSOP | Package footprint and pinout must match for board-level drop-in compatibility. |
| Operating temperature range (°C) | -40 to 85 | -40 to 85 | Temperature range confirms suitability for industrial and extended-environment applications. |
| Internal oscillator | Yes | Yes | An internal oscillator simplifies design by eliminating external clock components. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1222IPWR | ADS1230IPW |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 20 |
| Sampling Rate(Per Second) | 240 | 80 |
| Number of Inputs | 2 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-ADC | PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 2.7V ~ 5.3V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.3V |
| Features | Temperature Sensor | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary functional differences between the ADS1230IPW and ADS1222IPWR?
The ADS1230IPW is a 20-bit delta-sigma analog-to-digital converter designed specifically for weigh scales and bridge sensors, featuring a fixed gain of 128 and a low-noise PGA. The ADS1222IPWR is a 24-bit delta-sigma ADC with a flexible input multiplexer, internal oscillator, and programmable gain amplifier, intended for general-purpose precision sensor measurement. The ADS1230 offers 20-bit resolution with a fixed gain stage, while the ADS1222 provides 24-bit resolution with configurable input and gain settings.
Are the ADS1230IPW and ADS1222IPWR pin-to-pin compatible?
No. The ADS1230IPW is supplied in a 16-pin TSSOP package, while the ADS1222IPWR is supplied in a 16-pin TSSOP package as well, but the pin functions and internal architecture differ between the two devices. The pinouts are not interchangeable, and each device must be designed into its own PCB land pattern according to its respective datasheet.
What are the resolution and data rate specifications for each device?
The ADS1230IPW provides 20-bit resolution with a selectable output data rate of 10 SPS or 80 SPS. The ADS1222IPWR provides 24-bit resolution with a programmable output data rate ranging from 20 SPS to 2 kSPS depending on configuration. The ADS1222 offers higher resolution and a wider data rate range, while the ADS1230 is optimized for low-speed, high-accuracy weigh-scale applications.
How do the input configurations differ between the ADS1230IPW and ADS1222IPWR?
The ADS1230IPW features a differential input with a fixed gain of 128, designed for direct connection to bridge sensors and load cells. The ADS1222IPWR includes a 4-channel input multiplexer supporting differential or single-ended inputs, with a programmable gain amplifier offering gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1222 provides greater input flexibility, while the ADS1230 is purpose-built for bridge sensor interfacing.
What are the supply voltage and power consumption characteristics of these ADCs?
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. The ADS1222IPWR operates from a single supply of 2.7 V to 5.5 V and typically consumes about 1.2 mW in normal mode, with a power-down mode available. Both devices are suitable for low-power portable instrumentation, though exact consumption depends on configuration and data rate.
Which device is more suitable for weigh-scale or bridge-sensor applications?
The ADS1230IPW is specifically designed for weigh-scale and bridge-sensor applications, featuring a fixed gain of 128, low noise, and a 20-bit resolution optimized for load-cell signal conditioning. The ADS1222IPWR is a more general-purpose 24-bit ADC with a flexible multiplexer and PGA, suitable for a broader range of sensor types. For dedicated weigh-scale designs, the ADS1230IPW is the more application-specific choice, while the ADS1222IPWR offers greater versatility for multi-sensor systems.
Do both devices support an internal oscillator, and how does clocking differ?
The ADS1230IPW requires an external clock source and does not include an internal oscillator. The ADS1222IPWR includes an internal oscillator, which can be used to simplify system design and reduce external component count. This difference affects board layout and bill-of-materials requirements, with the ADS1222 offering a more integrated clocking solution.
What are the operating temperature ranges for the ADS1230IPW and ADS1222IPWR?
Both the ADS1230IPW and ADS1222IPWR are specified for an operating temperature range of -40°C to +85°C, making them suitable for industrial and commercial applications. Designers should verify the specific grade and package thermal characteristics in the respective manufacturer datasheets for their target operating conditions.