Part A
ADS1242IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 5745 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1242IPWR and ADS1202IPWRG4 are not functionally interchangeable. The ADS1242IPWR is a 24-bit delta-sigma ADC with an SPI interface and integrated PGA, while the ADS1202IPWRG4 is a 16-bit delta-sigma modulator with a single-bit output stream. They differ in resolution, output type, interface, and channel count, so the ADS1202IPWRG4 cannot directly replace the ADS1242IPWR in existing designs.
Different output type
Different resolution
Different interface
Different channel count
Parts at a glance
Part B
ADS1202IPWRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4745 PCS
- Package
- TSSOP-8
- Series
- Acquisition de données - ADC DAC - dédié
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1242IPWR | ADS1202IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 24-bit delta-sigma converter offers far finer resolution than a 16-bit device, affecting measurement precision. |
| Architecture | Delta-Sigma (with PGA) | Delta-Sigma modulator | The ADS1242 integrates a programmable gain amplifier and digital filter for direct sensor interfacing, while the ADS1202 is a modulator-only device requiring external digital filtering, changing system design complexity. |
| Number of input channels | 4 (differential) | 1 (differential) | Channel count determines how many signals can be measured; the ADS1242 supports multi-channel multiplexed measurements while the ADS1202 handles a single differential input. |
| Output interface | SPI (serial) | Serial bit-stream (modulator output) | The output format dictates how the host processor receives data; the ADS1242 provides standard SPI digital words, whereas the ADS1202 outputs a 1-bit modulator stream needing external decimation. |
| Programmable gain amplifier (PGA) | Yes (gain 1 to 128) | No | An integrated PGA allows small sensor signals to be amplified before conversion, improving effective resolution; its absence in the ADS1202 requires external amplification. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 4.5 V to 5.5 V | Supply range affects compatibility with low-voltage logic and battery-powered systems; the ADS1242 operates over a wider, lower-voltage range than the ADS1202. |
| Package | TSSOP-16 | TSSOP-8 | Package footprint and pin count affect PCB layout and board space; the two devices are not pin-compatible, so substitution requires layout changes. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range indicates environmental suitability; both parts share the same industrial range, so this parameter does not differentiate them. |
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 | ADS1242IPWR | ADS1202IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | 15 | 40k |
| Data Interface | SPI | Serial |
| Voltage Supply Source | - | Single Supply |
| Voltage - Supply | - | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 24 | - |
| Number of Inputs | 4 | - |
| Input Type | Differential, Single Ended | - |
| Configuration | MUX-PGA-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 3.3V, 5V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
| Features | PGA | - |
Frequently asked questions
Are the ADS1242IPWR and ADS1202IPWRG4 functionally interchangeable?
No. The ADS1242IPWR is a 24-bit delta-sigma analog-to-digital converter with an on-chip PGA and SPI interface, while the ADS1202IPWRG4 is a 16-bit delta-sigma modulator that outputs a 1-bit data stream. They differ in resolution, output format, and intended signal-chain role, so they are not direct substitutes.
What are the resolution and architecture differences between the ADS1242IPWR and ADS1202IPWRG4?
The ADS1242IPWR provides 24-bit resolution with a delta-sigma ADC architecture and integrated programmable gain amplifier. The ADS1202IPWRG4 is a 16-bit delta-sigma modulator delivering a 1-bit serial bitstream for external digital filtering, rather than a fully integrated ADC output word.
Do both devices use the same digital interface?
No. The ADS1242IPWR communicates via an SPI-compatible serial interface for reading conversion results and configuring registers. The ADS1202IPWRG4 outputs a 1-bit modulated data stream (MDO) plus a clock output, requiring an external digital filter or FPGA/DSP to reconstruct the conversion result.
Are the ADS1242IPWR and ADS1202IPWRG4 available in the same package?
Both devices are offered in TSSOP packages, but the pinouts and pin functions differ because of their different architectures and interfaces. PCB layout and pin assignment must be verified against each device's respective datasheet before any board-level substitution is considered.
Which device is better suited for direct sensor measurement with an integrated signal chain?
The ADS1242IPWR is better suited for direct low-level sensor measurement because it integrates a PGA and provides complete 24-bit conversion results over SPI. The ADS1202IPWRG4 is intended for applications where the modulation bitstream is processed by an external digital filter, such as isolated measurement or motor control systems.
Can the ADS1202IPWRG4 replace the ADS1242IPWR in an existing SPI-based design?
No, not without redesign. The ADS1202IPWRG4 does not provide SPI register access or a parallel conversion result word; it outputs a 1-bit modulator stream. Replacing an ADS1242IPWR would require adding an external digital filter and reworking the interface and firmware.
Do both parts share the same supply voltage requirements?
Both devices operate from a single 5 V analog supply in their standard configurations, but the ADS1242IPWR also supports a separate digital supply for the interface. Exact supply ranges and recommended operating conditions should be confirmed in each device's official datasheet before design commit.