Part A
ADS1271IBPWR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6728 PCS
- Package
- TSSOP-16
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1220IPWR and ADS1271IBPWR are not drop-in replacements for one another. Although both are 24-bit delta-sigma analog-to-digital converters in TSSOP-16 packages, they differ fundamentally in architecture, resolution versus speed trade-off, interface type, and channel configuration, so substituting one for the other requires a full redesign of the signal chain and PCB layout.
Different data rate class
Different interface type
Different channel architecture
Different supply and reference scheme
Parts at a glance
Part B
ADS1220IPWR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6260 PCS
- Package
- TSSOP-16
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1220IPWR | ADS1271IBPWR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 4 (2 differential / 4 single-ended) | 1 (1 differential) | The ADS1220 supports multiplexed multi-channel sensing, while the ADS1271 is a single-channel device, limiting direct substitution in multi-channel systems. |
| Maximum sample rate | 2 kSPS | 105 kSPS | The ADS1271 offers far higher throughput, making it suitable for wide-bandwidth signals where the ADS1220 would be too slow. |
| Interface type | SPI | SPI | Both use SPI, so the digital host interface is compatible, easing board-level redesign. |
| Programmable gain amplifier (PGA) | Yes (gain 1 to 128) | No | The ADS1220's integrated PGA allows direct connection of low-level sensors, whereas the ADS1271 requires external signal conditioning. |
| Supply voltage (analog) | 2.3 V to 5.5 V | 4.75 V to 5.25 V | The ADS1220 operates over a wider and lower supply range, enabling low-voltage or battery-powered designs not possible with the ADS1271. |
| Package | TSSOP-16 | TSSOP-16 | Identical package and pin count simplify footprint reuse, though pin functions differ and must be verified. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +105 °C | The ADS1220 supports a higher maximum junction/ambient temperature, offering margin in harsh environments. |
| Typical supply current | ~0.6 mA (normal mode) | ~7 mA (high-speed mode) | The ADS1220 draws significantly less current, making it preferable for low-power applications where the ADS1271 would be unsuitable. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1271IBPWR | ADS1220IPWR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 105k | 2k |
| Number of Inputs | 1 | 2, 4 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External, Internal, Supply |
| Voltage - Supply, Analog | 5V | 2.3V ~ 5.5V, ±2.5 |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
| Features | - | PGA, Temperature Sensor |
Frequently asked questions
What are the primary differences between the ADS1220IPWR and ADS1271IBPWR?
The ADS1220IPWR is a 24-bit, 4-channel, delta-sigma ADC with an integrated PGA, internal reference, and SPI interface, housed in a TSSOP-16 package. The ADS1271IBPWR is a 24-bit, single-channel, wide-bandwidth delta-sigma ADC with a fixed gain of 1, offering higher data rates up to 105 kSPS, housed in a TSSOP-16 package. The ADS1220 targets low-speed, multi-sensor precision measurement, while the ADS1271 targets higher-speed, single-channel AC and DC measurement.
Are the ADS1220IPWR and ADS1271IBPWR pin-compatible?
No. Although both devices are offered in a TSSOP-16 package, their pin functions and internal architectures differ. The ADS1220IPWR includes input multiplexer, PGA, and internal reference pins, while the ADS1271IBPWR has a dedicated single-channel analog input structure with different digital control and clock pins. They are not direct drop-in replacements.
What are the maximum data rates of the ADS1220IPWR and ADS1271IBPWR?
The ADS1220IPWR supports programmable data rates up to 2 kSPS in normal mode (up to 20 kSPS in turbo mode per datasheet). The ADS1271IBPWR supports data rates up to 105 kSPS in high-speed mode, 52 kSPS in high-resolution mode, and 10.5 kSPS in low-power mode.
Do both devices include an internal reference and PGA?
The ADS1220IPWR integrates a low-noise PGA (gain 1 to 128) and an internal 2.048 V reference, along with an input multiplexer for four single-ended or two differential inputs. The ADS1271IBPWR does not include an integrated PGA or internal reference; it requires an external reference voltage and provides a fixed gain of 1.
Which device is better suited for multi-sensor precision measurement?
The ADS1220IPWR is better suited for multi-sensor precision measurement because it provides a 4-channel input multiplexer, integrated PGA with gains up to 128, internal reference, and low-noise performance at data rates up to 2 kSPS, making it appropriate for thermocouples, RTDs, and bridge sensors. The ADS1271IBPWR is single-channel and lacks a PGA, so it is less flexible for multi-sensor systems.
Which device is better suited for high-speed AC or vibration measurement?
The ADS1271IBPWR is better suited for high-speed AC or vibration measurement because it supports data rates up to 105 kSPS with wide signal bandwidth and excellent AC performance, while the ADS1220IPWR is limited to 2 kSPS in normal mode and is optimized for low-speed precision DC measurements.
What are the supply voltage requirements for the ADS1220IPWR and ADS1271IBPWR?
The ADS1220IPWR operates from an analog supply (AVDD) of 2.3 V to 5.5 V and a digital supply (DVDD) of 2.3 V to 5.5 V. The ADS1271IBPWR operates from an analog supply (AVDD) of 4.75 V to 5.25 V and a digital supply (DVDD) of 1.65 V to 3.6 V, requiring a 5 V analog supply.
Can the ADS1220IPWR and ADS1271IBPWR share the same SPI interface?
Both devices use an SPI-compatible serial interface, but their protocol details, register maps, and command structures differ. The ADS1220IPWR uses a command-based SPI interface with configuration registers, while the ADS1271IBPWR uses a simpler read-only data output format with dedicated control pins. They cannot share identical firmware without modification.