Part A
ADS1243IPWR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 2763 ПКС
- Package
- TSSOP-20
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1243IPWR and ADS1202IPWRG4 are not drop-in replacements for one another. The ADS1243IPWR is a 24-bit delta-sigma ADC with an integrated PGA and SPI interface, while the ADS1202IPWRG4 is a 16-bit delta-sigma modulator with a single-bit output stream. They differ in resolution, output interface, channel configuration, and package pinout, so direct substitution is not feasible without a full system redesign.
Different output interface
Different resolution
Different channel configuration
Different package pinout
Parts at a glance
Part B
ADS1202IPWRG4
Техасские инструменты
- Lifecycle
- Active
- Stock
- 4745 ПКС
- Package
- TSSOP-8
- Series
- Сбор данных - ADC-DAC - Специальное назначение
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1243IPWR | ADS1202IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the converter can distinguish; a 24-bit ADC offers far finer measurement granularity than a 16-bit device. |
| Architecture | Delta-Sigma (ADC) | Delta-Sigma Modulator | The ADS1243 is a complete ADC with digital filter and interface, while the ADS1202 is a modulator-only device requiring external digital filtering, so they are not drop-in substitutes. |
| Number of Input Channels | 8 (differential/ single-ended) | 1 (differential) | Channel count defines how many signals can be measured; the multi-channel ADS1243 suits multi-sensor systems, whereas the single-channel ADS1202 suits one isolated measurement path. |
| Output Interface | SPI | Serial bit-stream (modulator output) | Interface compatibility determines whether the part can connect directly to a host microcontroller; the ADS1202 outputs a raw 1-bit stream needing an external digital filter. |
| Supply Voltage (analog) | 2.7 V to 5.25 V | 4.5 V to 5.5 V | Supply range affects compatibility with low-voltage systems; the ADS1243 operates down to 2.7 V while the ADS1202 requires a nominal 5 V rail. |
| Package | TSSOP-20 | TSSOP-8 | Package footprint and pin count must match the PCB layout; the different pin counts mean the two parts are not physically interchangeable. |
| Internal PGA | Yes (gain 1 to 128) | No | An integrated programmable gain amplifier allows direct connection of low-level sensors without external amplification; the ADS1202 lacks this, requiring external front-end gain. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range indicates environmental robustness; both parts share the same industrial range, so this is not a differentiator. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1243IPWR | 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 | 8 | - |
| 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 ~ 5.25V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
| Features | PGA | - |
Frequently asked questions
What are the primary functional differences between the ADS1243IPWR and ADS1202IPWRG4?
The ADS1243IPWR is a 24-bit delta-sigma analog-to-digital converter (ADC) with a built-in PGA and SPI interface, designed for precision low-frequency measurement. The ADS1202IPWRG4 is a 16-bit delta-sigma modulator that outputs a 1-bit data stream for isolated or high-speed signal conversion, requiring an external digital filter or FPGA for decimation. They serve different signal-chain roles and are not functionally equivalent.
Do the ADS1243IPWR and ADS1202IPWRG4 have the same package and pinout?
No. The ADS1243IPWR is supplied in a 20-pin TSSOP (PW) package, while the ADS1202IPWRG4 is supplied in a 16-pin TSSOP (PW) package. Pin counts and pin functions differ, so PCB land patterns and routing are not interchangeable.
Can the ADS1202IPWRG4 directly replace the ADS1243IPWR in an existing design?
No. The ADS1243IPWR integrates a complete ADC with digital filter and SPI output, whereas the ADS1202IPWRG4 provides only a modulator output stream. A direct replacement would require adding an external digital decimation filter, changing the digital interface, and redesigning the PCB for the different package and pinout.
What are the resolution and output data format differences between these two devices?
The ADS1243IPWR provides 24-bit resolution with a serial SPI output of converted codes. The ADS1202IPWRG4 is a 16-bit modulator that outputs a 1-bit oversampled data stream; effective resolution depends on the external digital filter and decimation ratio selected by the system designer.
Are the supply voltage requirements of the ADS1243IPWR and ADS1202IPWRG4 the same?
No. The ADS1243IPWR operates from a single 2.7 V to 5.25 V analog supply (with a separate digital supply range) per its datasheet. The ADS1202IPWRG4 operates from a 5 V analog supply with a 3 V to 5.5 V digital supply. Designers must verify exact rails against the respective manufacturer datasheets before substitution.
Which device is better suited for isolated signal measurement?
The ADS1202IPWRG4 is typically preferred for isolated measurement because its 1-bit modulator output can be passed through a digital isolator and decimated on the isolated or non-isolated side. The ADS1243IPWR, with its integrated SPI ADC, is intended for non-isolated precision measurement systems.
Do both parts support the same digital interface?
No. The ADS1243IPWR uses a standard SPI-compatible serial interface for reading conversion results and configuring the device. The ADS1202IPWRG4 outputs a single-bit modulated data stream plus a clock, which must be processed by an external digital filter; it does not provide an SPI register interface.
Are the ADS1243IPWR and ADS1202IPWRG4 interchangeable in terms of accuracy specifications?
No. The ADS1243IPWR specifies 24-bit no-missing-code performance and low-noise PGA characteristics for precision DC measurement. The ADS1202IPWRG4 specifies modulator performance (e.g., 16-bit resolution) that is realized only after appropriate external filtering. Accuracy depends on different external conditions, so the specifications are not directly interchangeable.