Part A
ADS8422IBPFBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1975 Stückzahl
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS8422IBPFBR and ADS8401IPFBTG4 are both 16-bit SAR analog-to-digital converters, but they differ in resolution-critical architecture, sampling rate, analog input configuration, and package pinout, so they are not functionally interchangeable in existing designs. The ADS8422IBPFBR offers a higher sampling rate and a differential input structure, while the ADS8401IPFBTG4 provides a pseudo-differential input with a different speed grade and footprint, requiring board-level and firmware validation before any substitution.
Different sampling rate
Different input configuration
Different package footprint
Different interface timing
Parts at a glance
Part B
ADS8401IPFBTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4086 Stückzahl
- Package
- TQFP-48
- Series
- Datenerfassung mit 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 | ADS8422IBPFBR | ADS8401IPFBTG4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so resolution is equivalent 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 (single-ended input with reference) | Pseudo-differential (single-ended input with reference) | Matching input topology means the analog front-end can generally be reused without redesign. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply simplifies power rail reuse and keeps input range consistent. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | Same parallel interface allows the same host bus and timing logic to be retained. |
| Package | 48-pin TQFP | 48-pin TQFP | Identical package and pin count enable a drop-in footprint replacement on the PCB. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Same industrial temperature range means both suit the same environmental conditions. |
| Power Consumption (Typical) | Approx. 155 mW | Approx. 100 mW | The lower-power ADS8401 may be preferable in thermally constrained designs, while the ADS8422 trades power for speed. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8422IBPFBR | ADS8401IPFBTG4 |
|---|---|---|
| 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 ADS8401IPFBTG4?
The ADS8422IBPFBR is a 16-bit, 4 MSPS fully differential SAR ADC with a parallel interface, while the ADS8401IPFBTG4 is a 16-bit, 1.25 MSPS pseudo-differential SAR ADC with a parallel interface. The ADS8422 offers higher throughput and fully differential input architecture, whereas the ADS8401 provides lower power consumption at a reduced sample rate.
Are the ADS8422IBPFBR and ADS8401IPFBTG4 pin-compatible?
No. Both devices are offered in 48-pin TQFP packages, but their pin functions and internal architectures differ. The ADS8422 uses a fully differential input structure, while the ADS8401 uses a pseudo-differential input structure, so the pin assignments and external component requirements are not identical. A direct drop-in replacement is not supported without design validation.
What is the maximum sampling rate of each device?
The ADS8422IBPFBR supports a maximum sampling rate of 4 MSPS. The ADS8401IPFBTG4 supports a maximum sampling rate of 1.25 MSPS. The higher throughput of the ADS8422 makes it suitable for faster data acquisition applications.
What is the resolution and architecture of these ADCs?
Both devices are 16-bit successive-approximation-register (SAR) analog-to-digital converters. The ADS8422IBPFBR provides 16-bit resolution with a fully differential input, while the ADS8401IPFBTG4 provides 16-bit resolution with a pseudo-differential input.
What supply voltages do the ADS8422IBPFBR and ADS8401IPFBTG4 require?
Both devices operate from a 5 V analog supply and a 2.7 V to 5.25 V digital supply, consistent with the ADS84xx family datasheet specifications. Designers should confirm exact supply rail tolerances against the respective manufacturer datasheets before finalizing the power design.
What interface do these ADCs use to output conversion data?
Both the ADS8422IBPFBR and ADS8401IPFBTG4 provide a parallel digital output interface for transferring conversion results to a host processor or FPGA. The parallel interface supports high-speed data readback suitable for their respective throughput rates.
Can the ADS8401IPFBTG4 be used as a lower-speed substitute for the ADS8422IBPFBR?
Only if the system can tolerate a reduction in maximum sampling rate from 4 MSPS to 1.25 MSPS and the input architecture change from fully differential to pseudo-differential is acceptable. The PCB layout, input driving network, and timing must be revalidated against the ADS8401 datasheet before substitution.
What are the typical applications for each device?
The ADS8422IBPFBR is suited for high-speed data acquisition, medical imaging, and test and measurement systems requiring 4 MSPS throughput. The ADS8401IPFBTG4 is suited for lower-speed precision applications such as industrial process control and instrumentation where 1.25 MSPS is sufficient and lower power is beneficial.