Part A
ADS8422IBPFBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1975 PCS
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Not a drop-in replacement
The ADS8422IBPFBR and ADS8401IPFBRG4 differ in resolution, sampling rate, and analog input architecture, so they are not functionally interchangeable in the same socket. The ADS8422IBPFBR offers 16-bit resolution at 4 MSPS with a pseudo-differential input, while the ADS8401IPFBRG4 provides 16-bit resolution at 1.25 MSPS with a fully differential input. Designers must revalidate the signal chain, timing, and interface before considering any substitution.
Different sampling rate
Different input configuration
Different interface timing
Different reference requirements
Parts at a glance
Part B
ADS8401IPFBRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9404 PCS
- Package
- TQFP-48
- 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 | ADS8422IBPFBR | ADS8401IPFBRG4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate | 4 MSPS | 1.25 MSPS | The ADS8422 offers over 3x the throughput, which directly affects achievable signal bandwidth and system timing margin. |
| Input Type | Pseudo-differential, unipolar | Pseudo-differential, unipolar | Matching input configuration allows similar analog front-end design without reworking the signal conditioning. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply simplifies power rail reuse when swapping parts. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | Same parallel interface means the digital host connection and timing can remain largely unchanged. |
| Package | 48-TQFP (PFB) | 48-TQFP (PFB) | Identical package and footprint enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Same industrial temperature range supports use in equivalent environmental conditions. |
| Power Consumption (typ) | ~155 mW | ~90 mW | Lower power in the ADS8401 may matter for thermally constrained or battery-influenced designs, while higher speed in ADS8422 costs power. |
| INL (max) | ±1.5 LSB | ±1.5 LSB | Equivalent linearity ensures comparable DC accuracy when substituting one part for the other. |
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 | ADS8422IBPFBR | ADS8401IPFBRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | - | 1.25M |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | Parallel | Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | - | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.95V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Base Product Number | ADS8422 | - |
| Sampling Rate (Per Second) | 4M | - |
| Number of A / D Converters | 1 | - |
| Mounting Type | Surface Mount | - |
| Packaging | Tape & Reel (TR) | - |
Frequently asked questions
What are the key differences between the ADS8422IBPFBR and the ADS8401IPFBRG4?
The ADS8422IBPFBR is a 16-bit, 4 MSPS fully differential pseudo-differential SAR ADC with a parallel interface, while the ADS8401IPFBRG4 is a 16-bit, 1.25 MSPS pseudo-differential SAR ADC with a parallel interface. The ADS8422 offers a higher sampling rate (4 MSPS vs. 1.25 MSPS) and a fully differential input architecture, whereas the ADS8401 provides a pseudo-differential input configuration at a lower throughput.
Are the ADS8422IBPFBR and ADS8401IPFBRG4 pin-compatible?
Both devices are offered in a 48-pin TQFP (PFB) package, but pin compatibility cannot be assumed solely from package type. Designers must verify pin functions, supply connections, and reference pin assignments against the respective datasheets before considering a layout-compatible substitution.
What is the maximum sampling rate of each device?
The ADS8422IBPFBR supports a maximum sampling rate of 4 MSPS. The ADS8401IPFBRG4 supports a maximum sampling rate of 1.25 MSPS. The higher throughput of the ADS8422 makes it suitable for faster signal acquisition applications.
What input configuration does each ADC use?
The ADS8422IBPFBR uses a fully differential input architecture, which provides improved common-mode noise rejection and better dynamic performance. The ADS8401IPFBRG4 uses a pseudo-differential input configuration, where the negative input is typically tied to a fixed reference level.
Do both devices offer the same resolution and interface type?
Yes. Both the ADS8422IBPFBR and ADS8401IPFBRG4 are 16-bit successive-approximation register (SAR) ADCs and both provide a parallel digital output interface. The primary differentiators are sampling rate and input architecture rather than resolution or interface type.
Can the ADS8401IPFBRG4 be used as a drop-in replacement for the ADS8422IBPFBR?
A direct drop-in replacement is not recommended without thorough validation. Although both are 16-bit parallel-output SAR ADCs in 48-pin TQFP packages, the differences in maximum sampling rate (1.25 MSPS vs. 4 MSPS) and input configuration (pseudo-differential vs. fully differential) can affect system timing, signal conditioning, and dynamic performance. The replacement should be evaluated against the target design requirements and manufacturer documentation.
Which device is better suited for higher-speed data acquisition systems?
The ADS8422IBPFBR is better suited for higher-speed data acquisition because it supports up to 4 MSPS, compared with 1.25 MSPS for the ADS8401IPFBRG4. Its fully differential input also supports improved dynamic performance in high-speed signal chains.