Part A
ADS1254E/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 4500 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1254E/2K5 and ADS1213EG4 are both 24-bit delta-sigma analog-to-digital converters, but they differ fundamentally in resolution architecture, interface protocol, channel configuration, and package footprint. The ADS1254E/2K5 offers a 4-channel differential multiplexed input with a serial SPI-compatible interface in a 20-pin SSOP, while the ADS1213EG4 provides a single differential input with a two-wire serial interface in a 24-pin SOIC. These differences in channel count, digital interface, and physical package prevent direct board-level substitution without redesign.
Different channel count
Different interface protocol
Different package footprint
Different input configuration
Parts at a glance
Part B
ADS1213EG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7697 PCS
- Package
- SSOP-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 | ADS1254E/2K5 | ADS1213EG4 | 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 | 4 (differential) | 4 (differential) | Channel count determines how many sensor signals can be digitized; both offer four differential inputs for multi-sensor designs. |
| Maximum Data Rate (SPS) | 20k | 6.25k | Higher sample rates support faster-changing signals; the ADS1254 can sample over three times faster than the ADS1213. |
| Interface Type | SPI (serial) | SPI (serial) | Both use a serial SPI interface, simplifying connection to microcontrollers and reducing pin count. |
| Supply Voltage (V) | 5 | 5 | Matching 5 V supply simplifies power rail design and allows direct substitution in existing 5 V systems. |
| Package / Mounting | 20-SSOP (surface mount) | 20-SSOP (surface mount) | Identical package and footprint enable drop-in board replacement without layout changes. |
| Input Type | Differential | Differential | Differential inputs reject common-mode noise, improving accuracy in noisy industrial environments. |
| Operating Temperature Range (°C) | -40 to +85 | -40 to +85 | Matching industrial temperature ranges ensure both parts work reliably in the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1254E/2K5 | ADS1213EG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 22 |
| Sampling Rate(Per Second) | 20k | 6.25k |
| Number of Inputs | 4 | 4 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-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 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1254E/2K5 and the ADS1213EG4?
The ADS1254E/2K5 is a 24-bit delta-sigma analog-to-digital converter with a fixed data rate of 20 kSPS and a 4-wire SPI-compatible serial interface, supplied in a 20-pin SSOP package. The ADS1213EG4 is a 22-bit delta-sigma ADC featuring a programmable gain amplifier (PGA) with gains from 1 to 128, a programmable data rate, and a synchronous serial interface, supplied in a 24-pin SSOP package. The ADS1254E/2K5 targets high-speed fixed-rate 24-bit conversion, while the ADS1213EG4 targets flexible low-level signal acquisition with programmable gain and rate.
Are the ADS1254E/2K5 and ADS1213EG4 pin-to-pin or package compatible?
No. The ADS1254E/2K5 is offered in a 20-pin SSOP package, whereas the ADS1213EG4 is offered in a 24-pin SSOP package. The differing pin counts and pin functions mean the two devices are not drop-in replacements and require different PCB footprints.
How do the resolution and data rate specifications compare?
The ADS1254E/2K5 provides 24-bit resolution with a fixed 20 kSPS output data rate. The ADS1213EG4 provides 22-bit resolution with a programmable output data rate. The ADS1254E/2K5 therefore offers higher resolution and a higher fixed throughput, while the ADS1213EG4 offers lower resolution but configurable throughput.
Does the ADS1213EG4 include a programmable gain amplifier that the ADS1254E/2K5 lacks?
Yes. The ADS1213EG4 integrates a programmable gain amplifier with selectable gains from 1 to 128, allowing direct amplification of low-level sensor signals. The ADS1254E/2K5 does not include an on-chip PGA, so external signal conditioning is required for low-amplitude inputs.
What serial interface does each device use?
The ADS1254E/2K5 uses a 4-wire SPI-compatible serial interface for communication with a host controller. The ADS1213EG4 uses a synchronous serial interface. Both are digital serial interfaces, but the protocol details and wiring differ, so firmware and host port configuration must be adapted accordingly.
Can the ADS1254E/2K5 and ADS1213EG4 be used interchangeably in an existing design?
No. Differences in package pin count (20-pin vs 24-pin SSOP), resolution (24-bit vs 22-bit), data rate architecture (fixed 20 kSPS vs programmable), on-chip PGA availability, and serial interface protocol prevent direct interchangeability. Any substitution requires a redesign of the PCB footprint, host interface firmware, and signal chain validation against the respective manufacturer datasheets.
Which device is better suited for low-level sensor signals requiring gain?
The ADS1213EG4 is better suited for low-level sensor signals because it integrates a programmable gain amplifier with gains up to 128, enabling direct amplification of small differential inputs. The ADS1254E/2K5 has no on-chip PGA, so low-level signals would require external amplification before conversion.