Part A
AD7622BSTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5006 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7622BSTZ and AD7623AST are both 16-bit successive-approximation ADCs from Analog Devices in the same LQFP-48 package family, sharing a comparable digital interface and supply architecture. However, they differ in maximum sampling rate and analog input configuration, so the AD7623AST can serve as a functional substitute for the AD7622BSTZ only where the lower throughput and the specific input range are acceptable. Designers should validate timing margins and input drive requirements before committing to the swap.
Resolution and Architecture
Validation required
Sampling Rate
Validation required
Package Type
High match
Analog Input Configuration
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7622BSTZ | AD7623AST | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so nominal resolution is identical and does not differentiate substitutability. |
| Sampling Rate | 2 MSPS | 1.33 MSPS | The AD7622 offers a higher maximum throughput, which matters for applications needing faster conversion cycles. |
| Architecture | SAR | SAR | Both use successive-approximation register architecture, giving similar latency and no pipeline delay characteristics. |
| Input Type | Differential | Differential | Differential inputs on both parts provide good common-mode rejection and noise immunity for precision measurements. |
| Supply Voltage (Analog) | 5 V | 5 V | Matching analog supply requirements simplifies power-rail design when considering substitution. |
| Interface | SPI / Parallel | SPI / Parallel | Both support serial and parallel interfaces, allowing flexible digital host connectivity in either design. |
| Package | 48-Lead LQFP | 48-Lead LQFP | Identical package and pinout support drop-in board-level substitution without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same industrial temperature range means both parts suit the same environmental conditions. |
| Power Consumption | ~90 mW typical | ~70 mW typical | The AD7623 draws less power, which can matter in thermally constrained or power-sensitive designs. |
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 | AD7622BSTZ | AD7623AST |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 2M | 1.33M |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Data Interface | SPI, Parallel, DSP | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 2.37V ~ 2.63V | - |
| Voltage - Supply, Digital | 2.37V ~ 2.63V | - |
Frequently asked questions
What are the key differences between the AD7622BSTZ and the AD7623AST?
The AD7622BSTZ is a 16-bit, 2 MSPS successive-approximation ADC in a 48-lead LQFP package, while the AD7623AST is a 16-bit, 1.33 MSPS SAR ADC in a 48-lead LQFP package. The primary differences are throughput rate (2 MSPS vs 1.33 MSPS) and the specified operating temperature grade implied by the package suffix.
Are the AD7622BSTZ and AD7623AST pin-compatible?
Both devices are offered in the same 48-lead LQFP package with the same pinout, so they are pin-compatible. However, pin compatibility does not guarantee identical AC performance or timing, and the system timing must be revalidated when substituting one for the other.
What is the maximum sampling rate of each device?
The AD7622BSTZ supports a maximum throughput of 2 MSPS. The AD7623AST supports a maximum throughput of 1.33 MSPS. Both are 16-bit SAR converters with no pipeline latency.
Do both parts support the same analog input range and interface?
Both devices provide a differential analog input and a parallel digital output interface compatible with the same host bus timing. The AD7622BSTZ and AD7623AST share the same serial/parallel interface family, but the maximum clock and conversion timing differ because of the different throughput ratings.
Can the AD7623AST be used as a drop-in replacement for the AD7622BSTZ?
It can be considered only if the system can tolerate the lower 1.33 MSPS throughput of the AD7623AST. Because the AD7622BSTZ provides 2 MSPS, replacing it with the AD7623AST reduces maximum sample rate, so the design's timing budget and anti-aliasing filter must be re-evaluated against the manufacturer datasheets.
What package do the AD7622BSTZ and AD7623AST use?
Both parts are supplied in a 48-lead LQFP package. The "BSTZ" and "AST" suffixes indicate the package and temperature grade per Analog Devices ordering conventions; confirm the exact grade in the respective datasheet before design release.
Which part should be selected for higher-throughput applications?
The AD7622BSTZ should be selected when the application requires the higher 2 MSPS throughput. The AD7623AST is appropriate where 1.33 MSPS is sufficient and the lower speed grade is acceptable for the system timing and power budget.