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 ADS1203IPWR are not functionally interchangeable despite sharing a TSSOP-16 package and similar supply voltage ranges. The ADS1242IPWR is a 24-bit delta-sigma ADC with an integrated PGA and SPI interface intended for precision sensor measurement, while the ADS1203IPWR is a 16-bit delta-sigma modulator with a single-bit output stream designed for isolated current-shunt and motor-control feedback. Their resolution, output format, input architecture, and interface requirements differ fundamentally, so substituting one for the other would require a complete redesign of the signal chain and digital interface.
Different output type
Different resolution
Different input architecture
Different digital interface
Parts at a glance
Part B
ADS1203IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 3345 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 | ADS1203IPWR | 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. |
| Architecture | Delta-Sigma (low-speed, high-resolution) | Delta-Sigma modulator (current-shunt, isolated) | The converter architecture dictates noise performance, speed, and typical application; the ADS1203 is a modulator intended for isolated current sensing, while the ADS1242 is a general-purpose precision ADC. |
| Number of input channels | 4 (differential) | 1 (differential) | Channel count determines how many signals can be measured without external multiplexing; the ADS1242 supports multi-channel sensing while the ADS1203 handles a single channel. |
| Output interface | SPI (serial) | Digital bit-stream (modulator output) | The output format must match the host controller; the ADS1242 provides a standard SPI interface, whereas the ADS1203 outputs a raw modulator bit-stream requiring external filtering/decimation. |
| 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 rails; the ADS1242 operates over a wider low-voltage range, while the ADS1203 requires a nominal 5 V supply. |
| Package | TSSOP-16 | TSSOP-8 | Package footprint and pin count affect PCB layout and drop-in compatibility; the two devices are not pin-compatible. |
| Typical data rate / output rate | Up to ~15 SPS (programmable) | Up to 40 kSPS (modulator clock dependent) | Data rate defines measurement bandwidth; the ADS1203 modulator supports much higher sampling rates for fast current-loop control, while the ADS1242 targets slow precision measurements. |
| Primary application focus | Precision sensor/industrial measurement | Isolated current-shunt / motor control sensing | Intended application indicates functional substitutability; the parts target different use cases and are generally not interchangeable in a given design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1242IPWR | ADS1203IPWR |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| 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 ADS1203IPWR?
The ADS1242IPWR is a 24-bit delta-sigma analog-to-digital converter (ADC) with a built-in PGA and SPI interface, designed for low-frequency precision measurement. The ADS1203IPWR is a 16-bit delta-sigma modulator that outputs a 1-bit data stream, intended for isolated current sensing and motor control applications requiring high common-mode transient immunity.
Do the ADS1242IPWR and ADS1203IPWR share the same package and pinout?
No. The ADS1242IPWR is supplied in a 20-pin TSSOP package, while the ADS1203IPWR is supplied in an 8-pin TSSOP package. Pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
What are the resolution and output data format differences between these two devices?
The ADS1242IPWR provides 24-bit resolution with a parallel or SPI-compatible digital output word. The ADS1203IPWR provides 16-bit resolution via a 1-bit delta-sigma modulated serial bitstream, which must be digitally filtered by an external FPGA, DSP, or microcontroller.
Which device is better suited for isolated current-sense applications?
The ADS1203IPWR is specifically designed for isolated current sensing, as its 1-bit modulator output can be transmitted across an isolation barrier and digitally filtered on the controller side. The ADS1242IPWR is a general-purpose precision ADC and is not optimized for isolated modulator applications.
How do the supply voltage and interface requirements compare?
The ADS1242IPWR operates from a single 2.7 V to 5.25 V analog supply with a separate digital supply, and uses an SPI-compatible serial interface. The ADS1203IPWR operates from a 5 V analog supply and a 3 V to 5.5 V digital supply, outputting a 1-bit modulated data stream rather than a standard SPI word.
Can the ADS1203IPWR be used as a direct substitute for the ADS1242IPWR in an existing design?
No. The devices differ in package, pinout, resolution, output format, and intended application. A direct substitution would require redesign of the PCB, digital filtering, and interface logic, and must be validated against the respective manufacturer datasheets.
What are the typical target applications for each device?
The ADS1242IPWR is typically used in precision sensor measurement, weigh scales, temperature sensing, and industrial process control. The ADS1203IPWR is typically used in motor control, isolated current sensing, power inverters, and industrial drives requiring galvanic isolation.