Part A
ADS8422IBPFBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1975 PCS
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8422IBPFBR and ADS8401IPFBT are both 16-bit successive-approximation ADCs in a TQFP-48 package with a parallel interface, making them strong functional replacement candidates. However, the ADS8422IBPFBR offers a significantly faster sampling rate and wider analog input range, so the replacement is viable only after validating timing margins, reference configuration, and input signal conditioning against the target application requirements.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Analog Input Range
Validation required
Parts at a glance
Part B
ADS8401IPFBT
Texas Instruments
- Lifecycle
- Active
- Stock
- 9962 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 | ADS8401IPFBT | 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 matters for high-speed acquisition; the ADS8401 is slower and may not meet fast-sampling requirements. |
| Input Type | Pseudo-differential (single-ended input with reference) | Pseudo-differential (single-ended input with reference) | Both use pseudo-differential inputs, so signal conditioning and drive requirements are similar. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply simplifies power-rail design and allows drop-in compatibility in the analog domain. |
| Interface | Parallel (16-bit) | Parallel (16-bit) | Both use a parallel interface, so the host-side bus timing and pin count are comparable. |
| Package | 48-pin TQFP (PFB) | 48-pin TQFP (PFB) | Same package and pin count enable board-level footprint compatibility, easing substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature range means both suit the same environmental conditions. |
| Power Consumption (Typical) | Approx. 155 mW | Approx. 100 mW | The ADS8401 draws less power, which matters for thermally constrained or power-sensitive designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8422IBPFBR | ADS8401IPFBT |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | - | 1.25M |
| Data Interface | Parallel | Parallel |
| Number of A/D Converters | - | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Series | microPOWER™ | - |
| Base Product Number | ADS8422 | - |
| Sampling Rate (Per Second) | 4M | - |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Number of A / D Converters | 1 | - |
| Architecture | SAR | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
| Mounting Type | Surface Mount | - |
| Packaging | Tape & Reel (TR) | - |
Frequently asked questions
What are the key differences between the ADS8422IBPFBR and ADS8401IPFBT?
The ADS8422IBPFBR is a 16-bit, 4-MSPS pseudo-differential SAR ADC with a parallel interface, while the ADS8401IPFBT is a 16-bit, 1.25-MSPS fully differential SAR ADC with a parallel interface. The ADS8422 offers higher throughput and pseudo-differential input configuration, whereas the ADS8401 provides a fully differential input architecture at a lower sample rate.
Are the ADS8422IBPFBR and ADS8401IPFBT pin-compatible?
Both devices are offered in a 48-pin TQFP package, but pin compatibility cannot be assumed based solely on package type. Pin functions and configurations differ between the two devices, so designers must verify pin assignments against the respective manufacturer datasheets before considering any layout reuse.
What is the maximum sampling rate of each device?
The ADS8422IBPFBR supports a maximum sampling rate of 4 MSPS. The ADS8401IPFBT supports a maximum sampling rate of 1.25 MSPS. The ADS8422 is therefore suited to higher-speed acquisition applications, while the ADS8401 targets lower-speed, precision-oriented designs.
What input configuration does each ADC use?
The ADS8422IBPFBR uses a pseudo-differential input configuration, while the ADS8401IPFBT uses a fully differential input configuration. This difference affects signal conditioning, reference driving, and common-mode handling in the analog front end.
Do both devices operate from the same supply voltage?
Both the ADS8422IBPFBR and ADS8401IPFBT operate with a 5-V analog supply and a separate digital supply in the 2.7-V to 5.25-V range, consistent with the Texas Instruments ADS84xx family. Designers should confirm exact supply rail requirements and sequencing from the respective datasheets.
What digital interface do these ADCs provide?
Both the ADS8422IBPFBR and ADS8401IPFBT provide a parallel digital output interface for connection to host processors, FPGAs, or DSPs. The interface timing and control signals should be reviewed against each device's datasheet to ensure compatibility with the target host.
Can the ADS8401IPFBT be used as a drop-in replacement for the ADS8422IBPFBR?
No. Although both are 16-bit SAR ADCs in 48-pin TQFP packages, they differ in maximum sampling rate (1.25 MSPS vs. 4 MSPS) and input configuration (fully differential vs. pseudo-differential). A direct drop-in replacement is not supported without validating timing, input architecture, and system-level performance requirements.
Which device is better suited for higher-throughput data acquisition systems?
The ADS8422IBPFBR is better suited for higher-throughput systems because its 4-MSPS sampling rate exceeds the 1.25-MSPS rate of the ADS8401IPFBT. System designers should still evaluate noise, input drive, and interface timing at the target throughput.