Part A
ADS1240E
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 5619 PCS
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1240E and ADS1211E/1KG4 are both 24-bit delta-sigma ADCs, but they differ in resolution architecture, input channel configuration, package footprint, and reference/supply requirements. The ADS1240E is not a drop-in replacement for the ADS1211E/1KG4; board-level redesign and firmware revalidation are required before substitution.
Different channel count
Different package footprint
Different input configuration
Different reference architecture
Parts at a glance
Part B
ADS1211E/1KG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 4654 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 | ADS1240E | ADS1211E/1KG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not distinguish them for substitutability. |
| Number of input channels | 4 (2 differential) | 4 (2 differential) | Channel count determines how many signals can be measured without external multiplexing. |
| Input type | Differential | Differential | Differential inputs improve noise rejection and are essential for low-level sensor measurements. |
| PGA gain range | 1 to 128 | 1 to 16 | A wider PGA range allows direct amplification of very small signals, affecting sensitivity to low-output sensors. |
| Data rate (SPS) | Up to 20 | Up to 1000 | Maximum sample rate determines suitability for faster-changing signals versus high-resolution static measurements. |
| Supply voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Supply range must match the system rail to allow direct drop-in replacement. |
| Interface | SPI | SPI | Interface compatibility ensures the host microcontroller can communicate without firmware changes. |
| Package | SSOP-20 | SSOP-28 | Different package footprints require PCB layout changes, preventing direct board-level substitution. |
| Internal reference | No | No | Absence of an internal reference means an external reference must be provided in both cases. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges confirm both parts suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1240E | ADS1211E/1KG4 |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | - | 16k |
| Number of Inputs | 4 | 4 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | - | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 3.3V, 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Base Product Number | ADS1240 | - |
| Sampling Rate (Per Second) | 15 | - |
| Number of A / D Converters | 1 | - |
| Mounting Type | Surface Mount | - |
| Packaging | Tube | - |
Frequently asked questions
What are the primary differences between the ADS1240E and the ADS1211E/1KG4?
The ADS1240E is a 24-bit delta-sigma analog-to-digital converter with a maximum data rate of 15 SPS and a single differential or two single-ended inputs, housed in a 24-pin TSSOP package. The ADS1211E/1KG4 is a 24-bit delta-sigma ADC with a maximum data rate of 1 kSPS, featuring a 4-channel differential input multiplexer and a programmable gain amplifier, supplied in a 28-pin TSSOP package. The ADS1211E/1KG4 offers higher throughput and more input channels, while the ADS1240E targets lower-speed, higher-resolution sensor measurement applications.
Are the ADS1240E and ADS1211E/1KG4 pin-compatible?
No. The ADS1240E uses a 24-pin TSSOP package, while the ADS1211E/1KG4 uses a 28-pin TSSOP package. The different pin counts and pin functions prevent direct PCB drop-in replacement without layout changes.
What are the maximum data output rates of these two ADCs?
The ADS1240E supports a maximum data rate of 15 SPS. The ADS1211E/1KG4 supports a maximum data rate of 1 kSPS. Designs requiring faster sampling should select the ADS1211E/1KG4, while the ADS1240E is suited to low-speed precision measurements.
How do the input channel configurations compare?
The ADS1240E provides one differential input or two single-ended inputs. The ADS1211E/1KG4 includes a 4-channel differential input multiplexer, allowing selection among multiple differential signal sources. The ADS1211E/1KG4 is preferable when multiple sensor channels must be digitized by a single converter.
Do both devices include a programmable gain amplifier (PGA)?
Yes. Both the ADS1240E and the ADS1211E/1KG4 integrate a programmable gain amplifier, enabling direct amplification of low-level sensor signals before conversion. Gain settings should be verified against the respective manufacturer datasheets for the specific configuration.
What supply voltage ranges do the ADS1240E and ADS1211E/1KG4 require?
Both devices operate from a single analog supply in the 2.7 V to 5.25 V range, with a separate digital supply. Exact limits and recommended operating conditions should be confirmed in the respective Texas Instruments datasheets before finalizing a design.
Which device is better suited for multi-channel industrial sensor systems?
The ADS1211E/1KG4 is generally better suited for multi-channel systems because its 4-channel differential multiplexer and 1 kSPS throughput allow sequential sampling of several sensors at higher speed. The ADS1240E, with a single differential input and 15 SPS maximum rate, is more appropriate for single-channel, high-resolution, low-speed measurements.
Can the ADS1240E be used as a direct substitute for the ADS1211E/1KG4 in an existing design?
No. Differences in package pin count (24 vs 28 pins), input multiplexer configuration, and maximum data rate (15 SPS vs 1 kSPS) mean the ADS1240E cannot be dropped into a board designed for the ADS1211E/1KG4. Any substitution requires schematic, layout, and firmware validation against the target datasheet.