Part A
ADS8422IBPFBR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 1975 ПКС
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8422IBPFBR and ADS8401IBPFBT share a common 48-pin TQFP footprint and parallel interface architecture, making them viable functional replacement candidates in existing layouts. However, the ADS8422IBPFBR offers a higher 16-bit resolution versus the 12-bit ADS8401IBPFBT, so system-level accuracy budgets and timing margins must be revalidated before substitution. Designers should confirm reference drive, digital timing, and analog front-end scaling to ensure the higher-resolution device meets the target application's performance envelope.
Package Type
High match
Interface Type
High match
Resolution
Validation required
Sampling Rate
Validation required
Parts at a glance
Part B
ADS8401IBPFBT
Техасские инструменты
- Lifecycle
- Active
- Stock
- 7966 ПКС
- Package
- TQFP-48
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS8401IBPFBT | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so nominal resolution is equivalent for substitutability. |
| Sampling Rate | 4 MSPS | 1.25 MSPS | The ADS8422 offers over 3x the throughput, which matters for high-speed acquisition systems. |
| Number of Input Channels | 1 (single-ended) | 1 (pseudo-differential) | Input configuration affects how the ADC interfaces with the analog front end and grounding scheme. |
| Input Type | Single-ended | Pseudo-differential | Pseudo-differential inputs reject common-mode noise better, which can matter in noisy environments. |
| Supply Voltage | 5 V (analog), 2.7–5.5 V (digital) | 5 V (analog), 2.7–5.5 V (digital) | Matching supply rails simplifies drop-in replacement without power redesign. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | Same parallel interface family eases FPGA/MCU bus integration when swapping parts. |
| Package | 48-TQFP (PFB) | 48-TQFP (PFB) | Identical package and footprint allow direct PCB substitution without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same industrial temperature range supports use in the same environmental conditions. |
| Power Consumption (typical) | ~155 mW | ~110 mW | Lower power in the ADS8401 can matter for thermally constrained or battery-backed designs. |
| INL (Integral Nonlinearity) | ±1.5 LSB (typ) | ±1.5 LSB (typ) | Equivalent linearity means comparable accuracy performance in precision measurement applications. |
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 | ADS8401IBPFBT |
|---|---|---|
| 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 ADS8401IBPFBT?
The ADS8422IBPFBR is a 16-bit, 4 MSPS fully differential pseudo-differential SAR ADC with a parallel interface, while the ADS8401IBPFBT 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 configuration, whereas the ADS8401 provides a lower speed grade with pseudo-differential input architecture. Both are packaged in a 48-pin TQFP.
Are the ADS8422IBPFBR and ADS8401IBPFBT 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 and configuration against the respective datasheets, as the internal architecture and input configuration differ between the two devices.
What is the maximum sampling rate of each device?
The ADS8422IBPFBR supports a maximum sampling rate of 4 MSPS. The ADS8401IBPFBT supports a maximum sampling rate of 1.25 MSPS. The ADS8422 is therefore suitable for higher-bandwidth signal acquisition applications.
What is the resolution and architecture of these ADCs?
Both the ADS8422IBPFBR and ADS8401IBPFBT are 16-bit successive-approximation-register (SAR) analog-to-digital converters. The ADS8422 features a fully differential input, while the ADS8401 uses a pseudo-differential input configuration.
What digital interface do these ADCs provide?
Both the ADS8422IBPFBR and ADS8401IBPFBT provide a parallel digital output interface for connection to host processors, FPGAs, or DSPs. The interface timing and bus width should be confirmed against each device's datasheet for the target system design.
What is the analog input configuration of each device?
The ADS8422IBPFBR uses a fully differential analog input architecture, which provides improved common-mode noise rejection and even-order harmonic suppression. The ADS8401IBPFBT uses a pseudo-differential input configuration. The choice between them depends on the signal source topology and noise requirements of the application.
Can the ADS8401IBPFBT be used as a drop-in replacement for the ADS8422IBPFBR?
No. Although both are 16-bit SAR ADCs in a 48-pin TQFP package, they differ in maximum sampling rate (4 MSPS vs 1.25 MSPS) and input architecture (fully differential vs pseudo-differential). A direct drop-in replacement is not supported without validating pin functions, timing, and analog front-end compatibility against both datasheets.
Which device is better suited for higher-speed data acquisition?
The ADS8422IBPFBR is better suited for higher-speed data acquisition because it supports up to 4 MSPS, compared with 1.25 MSPS for the ADS8401IBPFBT. The higher throughput of the ADS8422 makes it preferable for wideband signal sampling and fast transient capture applications.