Part A
ADS1242IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 5745 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1242IPWR and ADS1203IPWRG4 are not functionally interchangeable. The ADS1242IPWR is a 24-bit delta-sigma ADC with an integrated PGA and SPI interface, while the ADS1203IPWRG4 is a 16-bit delta-sigma modulator with a single-bit output stream. They differ in resolution, output interface, input architecture, and package pinout, so the ADS1203IPWRG4 cannot directly replace the ADS1242IPWR in existing designs.
Different output interface
Different resolution
Different input architecture
Different package pinout
Parts at a glance
Part B
ADS1203IPWRG4
德州儀器
- Lifecycle
- Active
- Stock
- 4572 件
- Package
- TSSOP-8
- Series
- 資料獲取-ADC DAC-專用
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 | ADS1203IPWRG4 | 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 and dynamic range. |
| Architecture / Output Type | Delta-sigma ADC (parallel/SPI digital output) | Delta-sigma modulator (1-bit bitstream output) | The ADS1242 delivers a complete digitized conversion result, while the ADS1203 outputs a raw 1-bit modulator stream requiring external digital filtering; this fundamentally changes system design and cannot be substituted directly. |
| Number of Input Channels | 4 (differential) | 1 (differential) | Channel count determines how many signals can be measured; a 4-channel device supports multi-sensor designs while a single-channel part requires external multiplexing. |
| Interface | SPI (serial) | 1-bit serial bitstream (modulator output) | The digital interface must match the host controller; SPI provides standard register-based communication, whereas the bitstream output requires dedicated digital filter logic (e.g., in an FPGA or DSP). |
| Supply Voltage | 2.7 V to 5.25 V (analog and digital) | 4.5 V to 5.5 V | Supply range affects compatibility with system power rails; the wider low-voltage range of the ADS1242 suits 3.3 V systems, while the ADS1203 requires a 5 V rail. |
| Package | TSSOP-16 | TSSOP-8 | Package footprint and pin count affect PCB layout and cannot be interchanged without board redesign; the two parts have different pinouts and sizes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +105 °C | The temperature range defines the environments in which the part can reliably operate; the ADS1203 supports a higher upper limit for harsher conditions. |
| Input Type / Signal Conditioning | Integrated PGA and input buffer | No integrated PGA (modulator only) | An integrated PGA allows direct connection of low-level sensors with programmable gain, whereas the ADS1203 requires external signal conditioning, affecting system complexity and accuracy. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1242IPWR | ADS1203IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| 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 ~ 125°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
What are the primary functional differences between the ADS1242IPWR and ADS1203IPWRG4?
The ADS1242IPWR is a 24-bit delta-sigma analog-to-digital converter (ADC) with a low-noise programmable gain amplifier (PGA) and an SPI-compatible serial interface, designed for direct sensor measurement. The ADS1203IPWRG4 is a 16-bit second-order delta-sigma modulator that outputs a high-speed 1-bit data stream, intended for isolated signal conditioning and applications requiring galvanic isolation where the digital filter is implemented externally (e.g., in an FPGA or DSP).
Do the ADS1242IPWR and ADS1203IPWRG4 have the same resolution?
No. The ADS1242IPWR provides 24-bit resolution with an on-chip digital filter, while the ADS1203IPWRG4 is a 16-bit modulator that produces a 1-bit stream; the effective 16-bit resolution of the ADS1203IPWRG4 is realized after external digital filtering of that stream.
Are the ADS1242IPWR and ADS1203IPWRG4 pin-to-pin or package compatible?
No. The ADS1242IPWR is supplied in a 20-pin TSSOP package, and the ADS1203IPWRG4 is supplied in an 8-pin TSSOP package. The pin counts, pin functions, and PCB land patterns differ, so they are not direct drop-in replacements.
Can the ADS1242IPWR and ADS1203IPWRG4 be used in the same application circuit?
Not interchangeably. The ADS1242IPWR integrates the complete ADC signal chain (PGA, modulator, digital filter, SPI interface) for direct microcontroller connection, whereas the ADS1203IPWRG4 requires an external digital filter and typically an isolation barrier, making the surrounding circuitry and interface architecture fundamentally different.
What are the supply voltage requirements for each device?
The ADS1242IPWR operates from a single 2.7 V to 5.25 V analog supply (AVDD) and a 2.7 V to 5.25 V digital supply (DVDD). The ADS1203IPWRG4 operates from a 4.5 V to 5.5 V analog supply (AVDD) and a 2.7 V to 5.5 V digital supply (DVDD). Designers should verify the exact limits in the respective manufacturer datasheets.
Which device is better suited for isolated measurement systems?
The ADS1203IPWRG4 is specifically intended for isolated measurement architectures because its 1-bit modulator output can be passed through a digital isolator and filtered on the isolated or non-isolated side. The ADS1242IPWR, with its integrated digital filter and SPI interface, is intended for non-isolated direct sensor-to-microcontroller designs.
Do both devices support the same digital interface?
No. The ADS1242IPWR uses an SPI-compatible serial interface for reading conversion results and configuring the on-chip PGA and filter. The ADS1203IPWRG4 provides a single-bit modulated data output plus a clock output, with no SPI register interface; filtering and decimation must be performed externally.