Part A
ADS8422IBPFBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1975 Stückzahl
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8422IBPFBR and ADS8401IBPFBRG4 are both 16-bit, single-channel, successive-approximation analog-to-digital converters in a TQFP-48 package, sharing a closely aligned architecture and pinout. While the ADS8422IBPFBR offers a higher maximum sampling rate and a wider analog supply range, the ADS8401IBPFBRG4 remains a viable functional substitute for lower-speed applications, provided the system timing and reference configuration are validated against the target design.
Sampling Rate
Validation required
Resolution and Interface
High match
Package Type
High match
Analog Supply Range
Validation required
Parts at a glance
Part B
ADS8401IBPFBRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 3277 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 | ADS8401IBPFBRG4 | 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 budget. |
| Number of Input Channels | 1 (single-ended) | 1 (pseudo-differential) | Input configuration affects how the ADC interfaces to the signal source and its immunity to ground noise. |
| Input Type | Single-ended | Pseudo-differential | Pseudo-differential inputs reject common-mode noise better, while single-ended is simpler to drive; this impacts analog front-end design. |
| Supply Voltage (Analog) | 5 V | 5 V | Both operate from a 5 V analog supply, so power rail requirements are compatible. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | Identical parallel interface simplifies drop-in replacement at the digital bus level. |
| Package | 48-TQFP (PFB) | 48-TQFP (PFB) | Same package and footprint allow direct PCB substitution without layout changes. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Identical industrial temperature range means both suit the same environmental conditions. |
| Power Consumption (Typical) | ~155 mW | ~100 mW | Lower power in the ADS8401 benefits thermally constrained or battery-influenced designs, though the ADS8422 trades power for speed. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8422IBPFBR | ADS8401IBPFBRG4 |
|---|---|---|
| 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 ADS8401IBPFBRG4?
The ADS8422IBPFBR is a 16-bit, 4 MSPS fully differential SAR ADC with a parallel interface, while the ADS8401IBPFBRG4 is a 16-bit, 1.25 MSPS pseudo-differential SAR ADC with a parallel interface. The ADS8422 offers higher throughput and full differential input, whereas the ADS8401 provides lower power consumption at a reduced sample rate.
Are the ADS8422IBPFBR and ADS8401IBPFBRG4 pin-compatible?
Both devices are offered in a 48-pin TQFP (PFB) package, but pin compatibility cannot be assumed solely from package type. The input configuration (fully differential vs. pseudo-differential) and internal reference/control pin functions differ, so the PCB layout and pin connections must be verified against each respective datasheet before substitution.
What is the maximum sampling rate of each device?
The ADS8422IBPFBR supports a maximum sampling rate of 4 MSPS. The ADS8401IBPFBRG4 supports a maximum sampling rate of 1.25 MSPS. Designs requiring higher throughput should select the ADS8422.
What input configuration does each ADC support?
The ADS8422IBPFBR features a fully differential analog input, which provides improved common-mode noise rejection and better THD performance. The ADS8401IBPFBRG4 uses a pseudo-differential input configuration, where the negative input is typically tied to a fixed reference level.
Do both devices operate from the same supply voltage?
Both the ADS8422IBPFBR and ADS8401IBPFBRG4 operate from a 5 V analog supply (AVDD) with a separate digital supply (DVDD) in the 2.7 V to 5 V range. However, power consumption differs due to the different sampling rates, so the supply decoupling and thermal budget should be reviewed per datasheet.
What interface do these ADCs use to connect to a host processor?
Both devices provide a parallel digital output interface for direct connection to DSPs, FPGAs, or microcontrollers. The ADS8422IBPFBR outputs 16-bit data at up to 4 MSPS, while the ADS8401IBPFBRG4 outputs 16-bit data at up to 1.25 MSPS; the host timing and bus width must be matched to the selected device.
Can the ADS8401IBPFBRG4 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 sampling rate (1.25 MSPS vs. 4 MSPS), input configuration (pseudo-differential vs. fully differential), and internal timing. A drop-in replacement requires full validation of pin functions, reference requirements, and timing against the target design; consult the respective datasheets before substitution.
Which device is better suited for high-speed data acquisition systems?
The ADS8422IBPFBR is better suited for high-speed data acquisition because its 4 MSPS throughput and fully differential input support wider signal bandwidth and improved dynamic performance. The ADS8401IBPFBRG4, at 1.25 MSPS, is more appropriate for lower-speed, lower-power applications.