Part A
ADS1282IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4636 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1282IPW and ADS1203IPWR are not functionally interchangeable. The ADS1282IPW is a high-resolution 31-bit delta-sigma ADC with an integrated PGA and dual-channel input multiplexer, while the ADS1203IPWR is a 16-bit isolated delta-sigma modulator with a single-ended input and no integrated PGA. Their resolution, input architecture, output interface, and package footprint differ fundamentally, so the ADS1203IPWR cannot serve as a direct substitute in ADS1282IPW designs without significant redesign.
Different resolution class
Different input architecture
Different output interface
Different package footprint
Parts at a glance
Part B
ADS1203IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3345 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 | ADS1282IPW | ADS1203IPWR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 31 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 31-bit delta-sigma converter offers far finer measurement granularity than a 16-bit device. |
| Architecture | Delta-sigma (2nd order) | Delta-sigma (2nd order) | Both use delta-sigma modulation, but the ADS1282 integrates a full high-resolution ADC while the ADS1203 is a modulator-only device requiring external digital filtering. |
| Output Interface | SPI (serial) | Serial bit-stream modulator output | The ADS1282 delivers digitized samples over SPI, whereas the ADS1203 outputs a raw 1-bit modulator stream that must be processed by an external digital filter, affecting system architecture and firmware. |
| Number of Input Channels | 2 (differential) | 1 (differential) | Channel count determines how many independent signals can be measured; the ADS1282 supports two differential inputs while the ADS1203 supports one. |
| Data Rate / Sample Rate | Up to 4 kSPS | Up to 40 kSPS (modulator clock dependent) | Sample rate sets the maximum signal bandwidth and update rate; the ADS1203 modulator can run at higher clock rates but requires external decimation filtering. |
| Supply Voltage | 5 V analog, 3.3 V digital (dual supply) | 5 V (single supply) | Supply requirements affect board-level power design and level shifting; the ADS1282 needs separate analog and digital rails while the ADS1203 runs from a single 5 V supply. |
| Package | TSSOP-28 | TSSOP-16 | Package footprint and pin count affect PCB layout and cannot be directly substituted without a board redesign. |
| Integrated PGA / Gain Stage | Yes (programmable gain) | No | An integrated PGA allows direct connection of low-level sensors without external amplification; the ADS1203 lacks this, requiring external signal conditioning. |
| Typical Application Focus | High-resolution seismic and energy exploration | Motor control and current sensing | The intended application domain indicates the devices are not functionally interchangeable; the ADS1282 targets precision measurement while the ADS1203 targets isolated current-sense feedback loops. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1282IPW | 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) | 4k | 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 | 31 | - |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Configuration | ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | - |
| Features | PGA | - |
Frequently asked questions
What are the primary functional differences between the ADS1282IPW and ADS1203IPWR?
The ADS1282IPW is a high-resolution, 31-bit delta-sigma analog-to-digital converter (ADC) designed for seismic and energy exploration applications, featuring a programmable gain amplifier (PGA) and multiple filter options. The ADS1203IPWR is a 16-bit, second-order delta-sigma modulator intended for isolated current and voltage sensing in motor control and industrial applications, outputting a digital bitstream rather than parallel data.
Do the ADS1282IPW and ADS1203IPWR have compatible package footprints?
No. The ADS1282IPW is supplied in a 28-pin TSSOP (PW) package, while the ADS1203IPWR is supplied in a 16-pin TSSOP (PW) package. The different pin counts and pin functions prevent a direct drop-in replacement without PCB redesign.
What are the resolution and data output format differences between these two devices?
The ADS1282IPW provides up to 31-bit resolution with a serial peripheral interface (SPI) for reading conversion results. The ADS1203IPWR is a 16-bit modulator that outputs a single-bit delta-sigma bitstream, which must be processed by an external digital filter or FPGA to derive the digital word.
Can the ADS1203IPWR be used as a direct substitute for the ADS1282IPW in seismic data acquisition systems?
No. The ADS1282IPW is specified for high-resolution seismic and energy exploration with integrated PGA and low-noise performance, while the ADS1203IPWR is a 16-bit modulator optimized for isolated current sensing. The resolution, output format, and analog front-end architecture differ, so they are not interchangeable in seismic acquisition designs.
What are the typical supply voltage requirements for the ADS1282IPW and ADS1203IPWR?
The ADS1282IPW operates from a 5 V analog supply and a 1.8 V to 3.3 V digital supply. The ADS1203IPWR operates from a 5 V analog supply and a 3.3 V or 5 V digital supply. Designers should verify exact supply ranges in the respective manufacturer datasheets before layout.
Which device is better suited for isolated current sensing in motor control applications?
The ADS1203IPWR is specifically designed for isolated current and voltage sensing, providing a digital bitstream output that can be galvanically isolated and processed by an external filter. The ADS1282IPW is a high-resolution ADC intended for seismic and energy exploration, not for isolated current-sense signal chains.
Are the ADS1282IPW and ADS1203IPWR pin-compatible or register-compatible?
No. The ADS1282IPW has 28 pins with SPI configuration registers and a PGA, while the ADS1203IPWR has 16 pins and no configuration register interface. Pin functions, package sizes, and control interfaces differ, so neither pin nor register compatibility exists between the two devices.