Part A
ADS1256IDBT
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 4833 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1256IDBT and ADS1282IPWG4 are both high-resolution delta-sigma ADCs, but they differ fundamentally in resolution, input architecture, package footprint, and target application class. The ADS1256IDBT is a 24-bit, 8-channel multiplexed ADC in a TSSOP-28 package aimed at general-purpose multi-channel sensing, while the ADS1282IPWG4 is a 31-bit, 2-channel differential ADC in a TSSOP-28 package optimized for high-dynamic-range seismic and energy-exploration signal chains. Because resolution, channel topology, input configuration, and interface behavior diverge, the ADS1282IPWG4 cannot be treated as a direct substitute for the ADS1256IDBT without redesign and revalidation.
Different resolution class
Different channel architecture
Different input configuration
Different application target
Parts at a glance
Part B
ADS1282IPWG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 2429 PCS
- Package
- TSSOP-28
- 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 | ADS1256IDBT | ADS1282IPWG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 31 | Higher resolution provides finer measurement granularity and lower quantization noise, which is critical for precision sensing applications. |
| Number of input channels | 8 (single-ended) / 4 (differential) | 2 (differential) | Channel count determines how many signals can be measured without external multiplexing; the ADS1256 supports more inputs. |
| Maximum sample rate (SPS) | 30k | 4k | Sample rate sets the maximum signal bandwidth that can be captured; the ADS1256 supports much faster data acquisition. |
| Interface type | SPI | SPI | Both use SPI, so the digital host interface is compatible, but the ADS1282 requires specific SPI framing for its 31-bit output. |
| Supply voltage (analog) | 5 V (single 5 V analog supply) | 5 V (AVDD 5 V, AVSS -2.5 V bipolar) | Supply configuration affects input range and system design; the ADS1282 uses a bipolar analog supply for true bipolar input swing. |
| Input type | Single-ended or differential (multiplexed) | Differential (bipolar) | Differential bipolar inputs reject common-mode noise and allow negative signal swings, which is essential for seismic and industrial sensing. |
| PGA / gain stages | Integrated PGA (1 to 64) | Integrated PGA (1 to 64) | Both offer programmable gain to match small sensor signals to the ADC full-scale range, improving effective resolution. |
| Package | TSSOP-28 | TSSOP-28 | Identical package footprint allows potential board-level drop-in substitution, though pin functions must be verified. |
| Operating temperature range | -40 to +85 °C | -40 to +85 °C | Both cover the industrial temperature range, so environmental compatibility is equivalent for most applications. |
| Typical application focus | General-purpose precision measurement, industrial process control | Seismic and energy exploration, high-resolution sensor digitization | The ADS1282 is optimized for very high resolution and low noise at lower speeds, while the ADS1256 balances speed and multi-channel flexibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1256IDBT | ADS1282IPWG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 31 |
| Sampling Rate(Per Second) | 30k | 4k |
| Number of Inputs | 4, 8 | 1 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 1.8V ~ 3.6V | 1.65V ~ 3.6V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1256IDBT and the ADS1282IPWG4?
The ADS1256IDBT is a 24-bit, 8-channel delta-sigma ADC with a maximum data rate of 30 kSPS, housed in a 28-pin TSSOP package. The ADS1282IPWG4 is a 31-bit, 2-channel delta-sigma ADC designed for seismic and high-resolution measurement applications, offering a maximum data rate of 4 kSPS and housed in a 28-pin TSSOP package. The ADS1256 provides more input channels and a higher output data rate, while the ADS1282 provides higher resolution and is optimized for low-frequency, high-dynamic-range signal acquisition.
Are the ADS1256IDBT and ADS1282IPWG4 pin-to-pin compatible?
No. Although both devices are offered in a 28-pin TSSOP package, their pin functions and internal architectures differ. The ADS1256 provides eight single-ended or four differential input channels with a multiplexer, while the ADS1282 provides two differential input channels with a different front-end structure. Pin assignments and external component requirements are not interchangeable, so the PCB layout must be designed specifically for each device.
Can the ADS1256IDBT be used as a direct replacement for the ADS1282IPWG4 in an existing design?
No. The two devices differ in resolution (24-bit vs. 31-bit), channel count (8 vs. 2), maximum data rate (30 kSPS vs. 4 kSPS), and pin configuration. A direct drop-in replacement is not possible without redesigning the analog front end, updating the digital interface configuration, and revalidating the system against the target specifications.
Which device is better suited for multi-channel data acquisition systems?
The ADS1256IDBT is better suited for multi-channel data acquisition because it integrates an 8-channel input multiplexer supporting eight single-ended or four differential inputs, whereas the ADS1282IPWG4 provides only two differential input channels. For systems requiring more than two input channels, the ADS1256 reduces external multiplexing requirements.
Which device offers higher resolution and better low-frequency performance?
The ADS1282IPWG4 offers higher resolution at 31 bits and is specifically designed for high-resolution seismic and low-frequency measurement applications. The ADS1256IDBT provides 24-bit resolution. For applications demanding the highest dynamic range and lowest noise at low input frequencies, the ADS1282 is the more appropriate choice based on manufacturer datasheet specifications.
What are the maximum data rates of the ADS1256IDBT and ADS1282IPWG4?
The ADS1256IDBT supports a maximum data rate of 30 kSPS. The ADS1282IPWG4 supports a maximum data rate of 4 kSPS. The ADS1256 is therefore preferable for applications requiring faster sampling, while the ADS1282 prioritizes resolution and noise performance over throughput.
Do both devices use the same digital interface for communication with a microcontroller?
Both devices use an SPI-compatible serial interface for communication with a host controller. However, register maps, command sets, and configuration details differ between the two devices. Firmware developed for one device cannot be reused directly for the other without modification according to the respective manufacturer datasheet.
What are the typical application areas for each device?
The ADS1256IDBT is typically used in industrial process control, instrumentation, and multi-channel sensor measurement systems where moderate resolution and multiple input channels are required. The ADS1282IPWG4 is typically used in seismic data acquisition, energy exploration, and high-resolution precision measurement systems where low-frequency noise and high dynamic range are critical.