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 ADS1274IPAPT and ADS1278IPAPTG4 share the same TQFP-64 package, 24-bit delta-sigma architecture, and identical pin function assignments, making the ADS1278IPAPTG4 a viable functional upgrade path where the additional channel count is acceptable. The primary distinction is channel count (4 vs 8), which must be validated against system requirements before substitution.
Package Type
High match
Resolution
High match
Channel Count
Validation required
Supply Voltage
High match
Parts at a glance
Part B
ADS1278IPAPTG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 9726 PCS
- Package
- TQFP-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 | ADS1274IPAPT | ADS1278IPAPTG4 | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 4 | 8 | Determines how many independent analog signals can be sampled simultaneously; a direct functional difference affecting system channel count. |
| Resolution | 24 bit | 24 bit | Sets the quantization precision of the conversion; identical resolution means comparable dynamic range and noise performance per channel. |
| Max Sample Rate | 144 kSPS | 144 kSPS | Defines the maximum conversion throughput per channel; matching rates ensure equivalent signal bandwidth capability. |
| Architecture | Delta-Sigma | Delta-Sigma | The converter topology affects noise shaping and filtering behavior; identical architecture supports similar signal-chain design. |
| Interface Type | SPI / Serial | SPI / Serial | Determines host connectivity and firmware compatibility; matching interfaces simplify drop-in substitution. |
| Supply Voltage | 5 V (analog), 1.8 V (digital) | 5 V (analog), 1.8 V (digital) | Power rail requirements must match the board design; identical supplies allow reuse of the same power scheme. |
| Package / Mounting | 64-TQFP (HTQFP), Surface Mount | 64-TQFP (HTQFP), Surface Mount | Footprint and mounting compatibility are essential for physical substitutability on an existing PCB. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +105 °C | Affects suitability for harsh environments; a narrower range may limit use in high-temperature applications. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1274IPAPT | ADS1278IPAPTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| 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 | -40°C ~ 105°C |
Frequently asked questions
What is the primary difference between the ADS1274IPAPT and ADS1278IPAPTG4?
The ADS1274IPAPT is a quad-channel, 24-bit simultaneous-sampling delta-sigma ADC, while the ADS1278IPAPTG4 is an octal-channel (eight-channel) version of the same family. Both share the same TQFP-64 package and similar architecture, but the ADS1278 provides twice the channel count.
Are the ADS1274IPAPT and ADS1278IPAPTG4 pin-compatible?
Both devices are offered in a 64-pin TQFP (PAP) package with the same pinout footprint, allowing the ADS1278 to be used in place of the ADS1274 on a compatible PCB layout. However, the additional channels on the ADS1278 utilize pins that are unused or differently assigned on the ADS1274, so designers must verify the specific pin functions against the respective datasheets before substitution.
What is the maximum data rate of these converters?
Both the ADS1274 and ADS1278 support a maximum data rate of 144 kSPS in High-Speed mode. They also offer High-Resolution mode (up to 52 kSPS), Low-Power mode (up to 52 kSPS), and Low-Speed mode (up to 10.5 kSPS), selectable via the mode pins.
Do both devices support the same digital interface and supply voltages?
Yes. Both the ADS1274IPAPT and ADS1278IPAPTG4 feature a SPI-compatible serial interface and support a flexible frame-sync or SPI format. They operate from a 5 V analog supply (AVDD) and a 1.8 V to 3.3 V digital supply (DVDD), with a separate 2.7 V to 3.3 V I/O supply (IOVDD) for the digital interface.
What is the typical signal-to-noise ratio (SNR) of these ADCs?
In High-Resolution mode, both the ADS1274 and ADS1278 achieve a typical SNR of 111 dB with a 1 kHz input signal. Performance is identical per channel across both devices since they share the same converter core design.
Can the ADS1278IPAPTG4 be used as a drop-in replacement for the ADS1274IPAPT in an existing design?
Because both parts share the same 64-pin TQFP package and pinout, the ADS1278 can physically populate the same footprint. However, a drop-in replacement requires that the host controller firmware and PCB routing account for the additional channel data in the serial frame. Designs using only four channels may function, but the frame length and channel count settings must be reconfigured to match the ADS1278.
What are the operating temperature ranges for these devices?
Both the ADS1274IPAPT and ADS1278IPAPTG4 are specified over the industrial temperature range of -40°C to +105°C, as indicated by the "I" suffix in the part number.
Do both parts offer the same power consumption per channel?
Yes. Both devices share the same per-channel power architecture. In High-Speed mode, each channel typically dissipates approximately 70 mW, so the ADS1278 (eight channels) consumes roughly twice the total power of the ADS1274 (four channels) under identical operating conditions.