Part A
ADS1278HPAP
Texas Instruments
- Lifecycle
- Active
- Stock
- 1933 PCS
- Package
- HTQFP-64
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1278HPAP and ADS1274IPAPTG4 share the same TQFP-64 package, 24-bit delta-sigma architecture, and wide operating temperature range, making them functionally compatible candidates. However, the ADS1278HPAP provides eight simultaneous-sampling channels versus four on the ADS1274IPAPTG4, and the two devices differ in power consumption and rated speed grade. Designers must confirm channel count requirements and verify thermal and power budgets before substituting one for the other.
Package Type
High match
Resolution
High match
Channel Count
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
ADS1274IPAPTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 8114 PCS
- Package
- TQFP-64
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS1274IPAPTG4 | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 8 | 4 | Channel count determines how many independent analog signals can be sampled simultaneously; a direct functional substitutability constraint. |
| Resolution | 24 bit | 24 bit | Both provide 24-bit resolution, so dynamic range and precision class are equivalent. |
| Maximum Sample Rate | 144 kSPS | 144 kSPS | Sample rate defines the maximum signal bandwidth the converter can digitize; identical rates support equivalent throughput. |
| Interface Type | SPI / Serial (Frame-Sync) | SPI / Serial (Frame-Sync) | Digital interface compatibility determines whether the part can drop into an existing host processor connection. |
| Supply Voltage (Analog) | 5 V | 5 V | Analog supply voltage must match the system rail and input signal range for correct operation. |
| Supply Voltage (Digital) | 1.8 V to 3.3 V | 1.8 V to 3.3 V | Digital I/O supply must be compatible with the host logic level to avoid level shifting. |
| Package / Pin Count | HTQFP-64 | HTQFP-64 | Package and pin count affect PCB footprint and layout compatibility for substitution. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +85°C | The wider temperature grade of the first part supports harsher environments; the second is limited to industrial range. |
| Power Consumption per Channel | ~70 mW/channel (High-Speed mode) | ~70 mW/channel (High-Speed mode) | Per-channel power helps estimate total thermal and supply loading when channel count differs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1278HPAP | ADS1274IPAPTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 144k | 144k |
| Number of Inputs | 8 | 4 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | 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 | 1.65V ~ 1.95V | 1.65V ~ 1.95V |
| Operating Temperature | -55°C ~ 175°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS1278HPAP and the ADS1274IPAPTG4?
The ADS1278HPAP is an 8-channel, 24-bit simultaneous-sampling delta-sigma ADC in a 64-pin HTQFP (PAP) package rated for high-temperature operation, while the ADS1274IPAPTG4 is a 4-channel, 24-bit simultaneous-sampling delta-sigma ADC in the same 64-pin HTQFP package with an industrial temperature rating and Pb-free/RoHS-compliant construction. The primary differences are channel count (8 vs 4) and the temperature grade.
Are the ADS1278HPAP and ADS1274IPAPTG4 pin-compatible?
Both devices are offered in the same 64-pin HTQFP (PAP) package, but they are not functionally interchangeable because the ADS1278 provides eight channels while the ADS1274 provides four. Pin assignments and channel-related functions differ, so a direct drop-in substitution should not be assumed without verifying the pinout against the respective datasheets.
What is the resolution and architecture of these ADCs?
Both the ADS1278HPAP and ADS1274IPAPTG4 are 24-bit delta-sigma analog-to-digital converters that use simultaneous-sampling architecture, making them suitable for multi-channel applications requiring tight channel-to-channel phase matching, such as industrial measurement and vibration analysis.
What are the temperature ratings of the ADS1278HPAP and ADS1274IPAPTG4?
The ADS1278HPAP is specified for high-temperature operation (the "H" grade in the part number denotes the extended/high-temperature variant), while the ADS1274IPAPTG4 carries the industrial "I" temperature grade. Designers should confirm the exact specified temperature range from the respective TI datasheets for their application.
Do these converters support multiple data rate modes?
Yes. The ADS1278 and ADS1274 families support selectable operating modes that trade off speed versus resolution, allowing the user to configure the device for high-speed, high-resolution, low-power, or low-speed operation depending on system requirements. The exact mode definitions and data rates should be taken from the TI datasheet.
What digital interface do the ADS1278HPAP and ADS1274IPAPTG4 use?
Both devices provide a serial digital interface for output data, with the ADS1278 supporting eight channels and the ADS1274 supporting four channels over the same interface family. The specific frame format, clocking, and daisy-chain options should be verified in the respective datasheets.
Can the ADS1274IPAPTG4 be used as a replacement for the ADS1278HPAP in an existing design?
Not directly. The ADS1274IPAPTG4 has only four channels versus eight on the ADS1278HPAP, and it carries a different temperature grade. A replacement would require redesign of the channel count, revalidation of the signal chain, and confirmation that the industrial temperature range meets the application's requirements.