Part A
ADS1256IDBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 4327 PCS
- Package
- SSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1256IDBR and ADS1213E/1KG4 are both 24-bit delta-sigma ADCs, but they differ fundamentally in resolution architecture, interface protocol, channel configuration, and package footprint. The ADS1256IDBR offers a 4-channel differential multiplexed input with SPI interface in a TSSOP-28 package, while the ADS1213E/1KG4 provides a 4-channel differential input with a different serial interface and a TQFP-28 footprint. These differences in pinout, communication protocol, and package type prevent direct board-level substitution without redesign.
Different package footprint
Different interface protocol
Different channel configuration
Different reference architecture
Parts at a glance
Part B
ADS1213E/1KG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 8128 PCS
- Package
- SSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS1256IDBR | ADS1213E/1KG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 22 | Higher resolution provides finer measurement granularity; a 24-bit ADC resolves smaller signal changes than a 22-bit device. |
| Number of input channels | 8 (single-ended) / 4 (differential) | 4 (differential) | Channel count determines how many signals can be measured without external multiplexing. |
| Maximum sample rate | 30 kSPS | 6.25 kSPS | Sample rate sets the maximum signal bandwidth the ADC can capture; faster rates suit higher-frequency or multiplexed measurements. |
| Interface type | SPI | SPI | Both use SPI, simplifying drop-in digital communication compatibility with the host controller. |
| Supply voltage (analog) | 5 V (single supply) | 5 V (single supply) | Matching analog supply simplifies power rail design and ensures comparable input range headroom. |
| Input type | Differential / single-ended | Differential | Single-ended capability allows measuring ground-referenced signals directly, while differential-only parts require additional signal conditioning. |
| Package | SSOP-28 | SSOP-28 | Identical package footprint enables board-level interchangeability without layout changes. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Matching temperature ranges ensure equivalent environmental robustness for industrial applications. |
| PGA (programmable gain amplifier) | Yes (1 to 64) | Yes (1 to 128) | On-chip PGA gain range affects the smallest measurable input signal and low-level sensor compatibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1256IDBR | ADS1213E/1KG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 22 |
| Sampling Rate(Per Second) | 30k | 6.25k |
| Number of Inputs | 4, 8 | 4 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 1.8V ~ 3.6V | 5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1256IDBR and the ADS1213E/1KG4?
The ADS1256IDBR is a 24-bit delta-sigma ADC with a multiplexed 8-channel input, capable of up to 30 kSPS, and includes a programmable gain amplifier (PGA) and a general-purpose I/O port. The ADS1213E/1KG4 is a 22-bit delta-sigma ADC with a 4-channel differential input, capable of up to 6.25 kSPS, and also integrates a PGA. The ADS1256 offers higher resolution, faster maximum data rate, and more input channels, while the ADS1213E provides a lower channel count and lower maximum sample rate.
Are the ADS1256IDBR and ADS1213E/1KG4 pin-to-pin compatible?
No. The ADS1256IDBR is supplied in a 28-pin SSOP package, while the ADS1213E/1KG4 is supplied in a 28-pin TSSOP package. Although both have 28 pins, the pin functions and package footprints differ, so they are not directly interchangeable without PCB redesign.
Which device offers a higher maximum data output rate?
The ADS1256IDBR supports a maximum data rate of 30 kSPS, whereas the ADS1213E/1KG4 supports a maximum data rate of 6.25 kSPS. The ADS1256 is therefore better suited for applications requiring faster sampling.
How do the input channel configurations compare?
The ADS1256IDBR provides 8 single-ended or 4 differential input channels through an input multiplexer. The ADS1213E/1KG4 provides 4 differential input channels. The ADS1256 offers greater flexibility for multi-channel signal acquisition.
Do both ADCs include a programmable gain amplifier (PGA)?
Yes. Both the ADS1256IDBR and the ADS1213E/1KG4 integrate a programmable gain amplifier, allowing direct connection of low-level signals without external amplification. The available gain settings should be verified in the respective manufacturer datasheets for the specific application.
What are the supply voltage requirements for each device?
The ADS1256IDBR operates from a single 5 V analog supply (AVDD) and a 1.8 V to 3.6 V digital supply (DVDD). The ADS1213E/1KG4 operates from a single 5 V analog supply and a 2.7 V to 5.25 V digital supply. Designers should confirm exact limits and recommended operating conditions in the official datasheets.
Which device is more suitable for high-resolution, multi-channel data acquisition?
The ADS1256IDBR is generally more suitable for high-resolution, multi-channel data acquisition because it provides 24-bit resolution, 8 multiplexed input channels, and a higher maximum data rate of 30 kSPS. The ADS1213E/1KG4, with 22-bit resolution and 4 differential channels, is better suited to lower-channel-count, lower-speed applications.