Part A
ADS1230IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2859 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1230IPW and ADS1243IPWRG4 are not drop-in replacements for one another. The ADS1230IPW is a dedicated 20-bit single-channel bridge sensor ADC in a TSSOP-16 package, while the ADS1243IPWRG4 is a 24-bit multi-channel delta-sigma ADC with an integrated PGA and SPI interface in a TSSOP-28 package. Their differences in resolution, channel count, package footprint, and digital interface make them unsuitable for direct substitution without a full redesign.
Different resolution
Different channel count
Different footprint
Different digital interface
Parts at a glance
Part B
ADS1243IPWRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 6536 PCS
- Package
- TSSOP-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS1243IPWRG4 | 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) | 8 (differential/4 single-ended) | More channels enable multi-sensor designs without adding external multiplexers, affecting system architecture and cost. |
| Input type | Differential | Differential / Single-ended | Single-ended capability broadens sensor compatibility, while differential-only designs offer better noise rejection. |
| Data rate (SPS) | 10 or 80 | Up to 15 (programmable) | Data rate determines how fast measurements can be taken and trades off against noise performance. |
| PGA gain settings | 1, 2, 64, 128 | 1 to 128 (programmable) | Programmable gain allows direct amplification of small sensor signals, improving effective resolution for low-level inputs. |
| Supply voltage | 2.7 V to 5.3 V | 2.7 V to 5.25 V | Supply range affects compatibility with system power rails and low-voltage operation. |
| Interface | SPI (2-wire, read-only) | SPI (full-duplex) | Interface type determines microcontroller compatibility and whether configuration registers can be written. |
| Package | 16-TSSOP | 20-TSSOP | Package footprint affects PCB layout and whether a drop-in replacement is possible. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Temperature range confirms suitability for industrial and harsh-environment applications. |
| Internal oscillator | Yes | No (external clock required) | An internal oscillator simplifies design and reduces external component count, while external clocking offers flexibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1230IPW | ADS1243IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 20 | 24 |
| Sampling Rate(Per Second) | 80 | 15 |
| Number of Inputs | 1 | 8 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | PGA-ADC | MUX-PGA-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 ~ 3.3V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.3V | 2.7V ~ 5.25V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary functional differences between the ADS1230IPW and ADS1243IPWRG4?
The ADS1230IPW is a 20-bit delta-sigma ADC optimized for weigh scales and bridge sensors, featuring a fixed gain of 128 and a maximum data rate of 80 SPS. The ADS1243IPWRG4 is a 24-bit delta-sigma ADC with a programmable gain amplifier (PGA) offering gains from 1 to 128, an SPI-compatible interface, and a maximum data rate of 15 SPS in its highest-resolution mode. The ADS1243IPWRG4 provides higher resolution and gain flexibility, while the ADS1230IPW offers a simpler, higher-speed signal chain for bridge applications.
Are the ADS1230IPW and ADS1243IPWRG4 pin-compatible?
No. The ADS1230IPW is supplied in a 16-pin TSSOP (PW) package, while the ADS1243IPWRG4 is supplied in a 20-pin TSSOP (PW) package. The differing pin counts and pin functions prevent direct PCB drop-in replacement without layout changes.
What are the resolution and data rate specifications for each device?
The ADS1230IPW provides 20-bit resolution with a data rate of 10 SPS or 80 SPS (selectable). The ADS1243IPWRG4 provides 24-bit resolution with programmable data rates up to 15 SPS in its highest-resolution configuration. The ADS1243IPWRG4 delivers higher resolution at lower throughput, whereas the ADS1230IPW targets faster, lower-resolution bridge measurements.
How do the input gain configurations differ between the two ADCs?
The ADS1230IPW has a fixed internal gain of 128, intended for direct connection to low-level bridge sensors. The ADS1243IPWRG4 integrates a programmable gain amplifier with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128, allowing it to interface with a wider range of sensor signal amplitudes.
Do both devices support the same digital communication interface?
No. The ADS1230IPW uses a simple two-wire serial interface (data and clock) for output data retrieval. The ADS1243IPWRG4 uses an SPI-compatible interface with additional control and status registers, enabling configuration of gain, data rate, and other settings. The interface architectures are not interchangeable.
What are the supply voltage requirements for the ADS1230IPW and ADS1243IPWRG4?
Both devices operate from a single analog supply of 2.7 V to 5.5 V. The ADS1230IPW also requires a digital supply in the same range, while the ADS1243IPWRG4 includes an internal reference and operates with a single supply in the same range. Designers should verify the specific supply and reference configuration against the respective manufacturer datasheets.
Which device is better suited for high-resolution, low-speed sensor measurement?
The ADS1243IPWRG4 is better suited for high-resolution, low-speed measurements because it provides 24-bit resolution, a programmable gain amplifier, and a lower maximum data rate that supports higher effective resolution. The ADS1230IPW is optimized for faster bridge measurements at 20-bit resolution and fixed gain.