Part A
ADS131E04IPAG
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 5221 PCS
- Package
- TQFP-64
- Series
- Data Acquisition - Analog Front End (AFE)
Replacement verdict
Compatible functional replacement candidate
The ADS131E04IPAG is a functional replacement candidate for the ADS131E08IPAGR only when the reduced channel count is acceptable; both devices share the same package, pinout family, supply architecture, and SPI interface, but the ADS131E04 provides four channels instead of eight, so system-level validation of channel count, input configuration, and firmware channel mapping is required before substitution.
Channel Count
Validation required
Package Type
High match
Supply Voltage
High match
Digital Interface
High match
Parts at a glance
Part B
ADS131E08IPAGR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6530 PCS
- Package
- TQFP-64
- Series
- Data Acquisition - Analog Front End (AFE)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS131E08IPAGR | ADS131E04IPAG | Why it matters |
|---|---|---|---|
| Number of input channels | 8 | 4 | Determines how many simultaneous analog signals can be measured; a direct functional difference affecting system channel count. |
| Resolution | 24 bit | 24 bit | Sets the dynamic range and precision of the ADC; identical here so measurement accuracy class is the same. |
| Maximum sample rate | 64 kSPS | 64 kSPS | Defines the highest per-channel throughput; matching rates mean timing and bandwidth requirements are interchangeable. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Must match the system power rail; identical range allows the same power supply design. |
| Interface | SPI | SPI | Determines host communication compatibility; same SPI interface means firmware and bus wiring can be reused. |
| Package | TQFP-64 | TQFP-64 | Affects PCB footprint and assembly; identical package allows drop-in board layout reuse. |
| Pin count | 64 | 64 | Pin count influences footprint and routing; both are 64-pin, though channel count differs internally. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Defines environmental robustness; matching ranges mean the same thermal qualification applies. |
| Internal PGA | Yes | Yes | On-chip gain stage affects signal conditioning needs; both having PGA means similar front-end design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS131E04IPAG | ADS131E08IPAGR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16, 24 | 16, 24 |
| Number of Channels | 4 | 8 |
| Power (Watts) | 10.2 mW | 17.6 mW |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 1.8V ~ 3.6V | 1.8V ~ 3.6V |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the primary difference between the ADS131E08IPAGR and the ADS131E04IPAG?
The ADS131E08IPAGR is an 8-channel, simultaneously sampling, 24-bit delta-sigma ADC, while the ADS131E04IPAG is a 4-channel version of the same family. Both share the same TQFP-64 package, SPI interface, and internal PGA, but the ADS131E08 provides twice the number of input channels.
Are the ADS131E08IPAGR and ADS131E04IPAG pin-compatible?
Yes. Both devices are offered in the same 64-pin TQFP (PAG) package and share a common pinout, with the additional channels of the ADS131E08 routed to pins that are unused or differently assigned on the ADS131E04. Designers should still verify the specific pin functions against the respective datasheets before layout.
Do both devices support the same data rate and resolution?
Yes. Both the ADS131E08 and ADS131E04 are 24-bit delta-sigma ADCs with programmable data rates from 1 kSPS to 64 kSPS per channel, and both integrate a programmable gain amplifier (PGA) with gains from 1 to 12. The channel count is the primary differentiator.
Can the ADS131E04IPAG be used as a drop-in replacement for the ADS131E08IPAGR in an existing design?
Not directly. Although the package and pinout are compatible, the ADS131E04 provides only 4 input channels versus 8 on the ADS131E08. A design requiring 8 channels cannot use the ADS131E04 without hardware and firmware changes. Conversely, an ADS131E04 design can generally accept the ADS131E08 if unused channels are configured appropriately.
What is the supply voltage and power consumption of these devices?
Both devices operate from an analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 1.8 V to 3.6 V. Typical power consumption scales with channel count and data rate; the ADS131E08 draws more total power than the ADS131E04 due to its additional active channels. Refer to the respective datasheets for exact per-channel power figures.
Do both parts support the same SPI interface and daisy-chain configuration?
Yes. Both the ADS131E08 and ADS131E04 use a standard SPI-compatible serial interface and support daisy-chaining of multiple devices, as well as multiple-device synchronization via the START and DRDY pins. The register map and command set are shared across the family.
Which part should be selected for a 6-channel biopotential measurement application?
The ADS131E08IPAGR should be selected because it provides 8 channels, allowing all 6 signal channels plus additional channels for reference or auxiliary measurements. The ADS131E04IPAG offers only 4 channels and would be insufficient for a 6-channel requirement without external multiplexing.