Part A
ADS1271IPWR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 1952 PCS
- Package
- TSSOP-16
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1271IPWR and ADS1202IPWRG4 are not drop-in replacements for one another. The ADS1271IPWR is a 24-bit delta-sigma ADC with a serial SPI-compatible interface, while the ADS1202IPWRG4 is a 16-bit delta-sigma modulator with a single-bit output stream. They differ in resolution, output interface, channel architecture, and package pinout, so a direct substitution is not feasible without redesign of the surrounding circuitry and firmware.
Different output interface
Different resolution
Different channel architecture
Different package pinout
Parts at a glance
Part B
ADS1202IPWRG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 4745 PCS
- Package
- TSSOP-8
- Series
- Data Acquisition - ADCs-DACs - Special Purpose
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1271IPWR | ADS1202IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 24-bit converter offers far finer quantization than a 16-bit one, directly affecting measurement precision. |
| Architecture | Delta-Sigma | Delta-Sigma | Both use delta-sigma modulation, which provides high resolution and inherent anti-aliasing, making them suitable for precision measurement and isolated signal-chain applications. |
| Sample Rate (max) | 105 kSPS | 40 kSPS | Maximum sample rate sets the bandwidth of signals that can be captured; the higher rate part supports faster-changing inputs and wider signal bandwidth. |
| Input Type | Differential | Differential | Differential inputs reject common-mode noise and improve dynamic performance, which is critical for low-level signal acquisition in noisy environments. |
| Supply Voltage (analog) | 5 V | 5 V | Analog supply voltage must match the system rail and affects input range and noise performance; both parts operate from a 5 V analog supply. |
| Interface | SPI / Serial | Serial (SPI-compatible) | The digital interface determines how the converter connects to a host controller; both provide serial output, but timing and framing details differ and must be matched to the MCU/DSP. |
| Package | TSSOP-16 | TSSOP-16 | Package footprint and pinout affect PCB layout and drop-in compatibility; matching packages simplify board rework and substitution. |
| Operating Temperature Range | -40 to +105 °C | -40 to +85 °C | The temperature range defines the environments where the part is guaranteed to meet specifications; the wider range part is preferable for industrial or harsh-environment designs. |
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 | ADS1271IPWR | 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) | 105k | 40k |
| Data Interface | SPI | Serial |
| Voltage Supply Source | - | Single Supply |
| Voltage - Supply | - | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 24 | - |
| 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 | - |
Frequently asked questions
What are the primary functional differences between the ADS1271IPWR and ADS1202IPWRG4?
The ADS1271IPWR is a 24-bit, single-channel delta-sigma analog-to-digital converter (ADC) designed for high-resolution, wide-bandwidth industrial measurement, supporting data rates up to 105 kSPS. The ADS1202IPWRG4 is a 16-bit, single-channel delta-sigma modulator intended for isolated current and voltage sensing in motor control and power conversion, outputting a 1-bit serial bitstream rather than parallel data words. They differ fundamentally in resolution, output format, and target application.
Are the ADS1271IPWR and ADS1202IPWRG4 pin-to-pin or package compatible?
No. The ADS1271IPWR is supplied in a 20-pin TSSOP (PW) package, while the ADS1202IPWRG4 is supplied in a 16-pin TSSOP (PW) package. The differing pin counts and pin functions preclude direct PCB footprint interchangeability without a layout redesign.
Can the ADS1202IPWRG4 directly replace the ADS1271IPWR in an existing design?
No. The ADS1202IPWRG4 outputs a 1-bit modulator bitstream requiring an external digital filter or FPGA sinc filter to reconstruct a 16-bit word, whereas the ADS1271IPWR provides a complete 24-bit ADC with an on-chip digital filter and SPI-compatible interface. The output format, resolution, package, and external component requirements differ, so substitution requires significant redesign and validation.
What are the maximum data rates of the ADS1271IPWR and ADS1202IPWRG4?
The ADS1271IPWR supports programmable data rates up to 105 kSPS in high-speed mode, with lower rates available in high-resolution and low-power modes. The ADS1202IPWRG4 modulator operates with a clock input up to 10 MHz, producing a bitstream whose effective resolution depends on the external digital filter's decimation ratio and output word rate.
What supply voltages do the ADS1271IPWR and ADS1202IPWRG4 require?
The ADS1271IPWR operates from a 5 V analog supply (AVDD) and a 1.8 V to 3.3 V digital supply (DVDD). The ADS1202IPWRG4 operates from a single 5 V supply for both analog and digital sections. Designers must verify supply rail compatibility when considering either device.
Which device is better suited for isolated current-sense applications?
The ADS1202IPWRG4 is specifically intended for isolated current and voltage sensing, as its 1-bit modulator output can be transmitted across an isolation barrier and reconstructed by a digital filter on the isolated or non-isolated side. The ADS1271IPWR, with its parallel-word SPI output and 24-bit resolution, is better suited to direct high-accuracy industrial measurement without an isolation barrier.
Do both devices support the same digital interface?
No. The ADS1271IPWR provides a SPI-compatible serial interface for reading 24-bit conversion results along with a DRDY signal. The ADS1202IPWRG4 provides a single-bit serial data output (MDAT) synchronized to an external clock (MCLK), with no on-chip digital filter or word-format interface. Interfacing the ADS1202IPWRG4 requires an external digital filter or FPGA.
What are the typical target applications for each device?
The ADS1271IPWR is typically used in industrial process control, weigh scales, medical instrumentation, and vibration analysis where 24-bit resolution and up to 105 kSPS are required. The ADS1202IPWRG4 is typically used in motor control, servo drives, and power inverters for isolated current and voltage feedback, where its 1-bit modulator output is processed by an external sinc filter.