Part A
ADS1274IPAPT
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 4734 PCS
- Package
- HTQFP-64
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1278HPAP and ADS1274IPAPT share the same 24-bit delta-sigma architecture, TQFP-64 footprint, and serial interface, making them functionally interchangeable in many designs. However, the ADS1278HPAP offers eight simultaneous-sampling channels versus four on the ADS1274IPAPT, and its high-temperature H-grade rating extends operation to 210°C compared with 125°C for the I-grade device. Designers must confirm channel count requirements and thermal operating conditions before substituting one for the other.
Channel Count
Validation required
Package Type
High match
Resolution and Architecture
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
ADS1278HPAP
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 1933 PCS
- Package
- HTQFP-64
- 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 | ADS1278HPAP | ADS1274IPAPT | Why it matters |
|---|---|---|---|
| Number of Channels | 8 | 4 | Determines how many analog signals can be sampled simultaneously; a direct functional substitutability constraint. |
| Resolution | 24 bit | 24 bit | Both provide 24-bit conversion, so dynamic range and precision class are equivalent. |
| Max Sample Rate | 144 kSPS | 144 kSPS | Identical throughput capability ensures comparable signal bandwidth handling. |
| Interface Type | SPI / Frame-Sync serial | SPI / Frame-Sync serial | Matching digital interface allows drop-in compatibility with the same host controller wiring. |
| Supply Voltage (Analog) | 5 V | 5 V | Same analog supply simplifies power rail design and substitution. |
| Operating Temperature Range | -40 to +125 °C | -40 to +125 °C | Equivalent temperature ratings support use in the same environmental conditions. |
| Package / Pin Count | HTQFP-64 | HTQFP-64 | Same package and pin count enable PCB footprint compatibility, though channel count differs. |
| Power Consumption per Channel | Lower per-channel (shared overhead across 8 channels) | Higher per-channel (overhead shared across 4 channels) | Affects thermal budget and efficiency; the 8-channel device amortizes fixed power over more channels. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1274IPAPT | ADS1278HPAP |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 144k | 144k |
| Number of Inputs | 4 | 8 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | ADC | ADC |
| Number of A/D Converters | 4 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 1.65V ~ 1.95V | 1.65V ~ 1.95V |
| Operating Temperature | -40°C ~ 125°C | -55°C ~ 175°C |
Frequently asked questions
What are the key architectural differences between the ADS1278HPAP and ADS1274IPAPT?
The ADS1278HPAP is an 8-channel, 24-bit simultaneous-sampling delta-sigma ADC, while the ADS1274IPAPT is a 4-channel, 24-bit simultaneous-sampling delta-sigma ADC. Both share the same proprietary delta-sigma architecture and are pin-compatible within the same family, but the ADS1278 provides twice the channel count of the ADS1274.
Do the ADS1278HPAP and ADS1274IPAPT support the same data rates and operating modes?
Yes. Both devices support four operating modes (High-Speed, High-Resolution, Low-Power, and Low-Speed) with programmable data rates. In High-Speed mode both achieve up to 144 kSPS per channel; in High-Resolution mode up to 52 kSPS; in Low-Power mode up to 52 kSPS; and in Low-Speed mode up to 10.5 kSPS. The mode selection and SPI-compatible interface behavior are consistent across both parts.
What are the package and temperature-grade differences between the ADS1278HPAP and ADS1274IPAPT?
The ADS1278HPAP is supplied in a 64-pin HTQFP (PAP) package rated for the -40°C to +125°C temperature range (H grade). The ADS1274IPAPT is supplied in a 64-pin HTQFP (PAP) package rated for the -40°C to +105°C temperature range (I grade). The package footprint and pinout are compatible, but the specified operating temperature ranges differ.
Can the ADS1274IPAPT be used as a drop-in replacement for the ADS1278HPAP in an existing design?
No, not as a direct drop-in replacement. Although both are 64-pin HTQFP devices in the same family, the ADS1278 provides 8 channels while the ADS1274 provides only 4 channels, so channel-count-dependent circuitry, firmware, and signal routing must be revalidated. Additionally, the temperature grade differs (H vs. I), so the target application's thermal requirements must be checked against the ADS1274IPAPT's -40°C to +105°C rating.
How do the power consumption figures compare between the ADS1278HPAP and ADS1274IPAPT?
Both devices share the same per-channel delta-sigma modulator design, so power scales with the number of active channels and the selected mode. The ADS1278HPAP, with 8 channels, draws approximately twice the total supply current of the 4-channel ADS1274IPAPT when all channels are active in the same mode. Designers should refer to the respective datasheet power tables for exact per-mode values, as total power depends on mode, clock frequency, and channel utilization.
Are the digital interface and control registers identical between the ADS1278HPAP and ADS1274IPAPT?
Yes. Both devices use the same SPI-compatible serial interface, the same control register map, and the same mode/format selection scheme. The primary functional difference is the number of channel data output words available per conversion cycle (8 vs. 4), which affects the frame length and the amount of data clocked out per sample period.
Which device is better suited for high-channel-count simultaneous-sampling applications?
The ADS1278HPAP is better suited for high-channel-count applications because it integrates 8 simultaneous-sampling 24-bit channels in a single package, reducing board space and simplifying synchronization compared with using two ADS1274IPAPT devices. The ADS1274IPAPT is appropriate when only 4 channels are required and a lower channel count is sufficient.
Do both devices share the same reference and analog input requirements?
Yes. Both the ADS1278HPAP and ADS1274IPAPT use the same external voltage reference architecture and the same differential analog input structure with identical input voltage range requirements relative to the reference. This commonality allows the analog front-end design to be reused between the two parts, provided the channel count and temperature grade differences are accounted for.