Part A
AD7621ASTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6501 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7621ASTZ and AD7622BSTZRL are both 16-bit, 1 MSPS/2 MSPS PulSAR analog-to-digital converters from Analog Devices in the same 48-lead LQFP package, sharing a compatible serial/parallel interface and reference architecture. The AD7622BSTZRL offers a higher throughput grade and a wider specified temperature range, making it a viable functional upgrade for the AD7621ASTZ in most designs, provided the system timing budget and thermal environment are validated against the faster conversion rate.
Resolution and Architecture
High match
Package and Pinout
High match
Sample Rate
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD7622BSTZRL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9899 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - 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 | AD7621ASTZ | AD7622BSTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is equivalent and does not affect substitutability. |
| Sampling Rate | 3 MSPS | 2 MSPS | The AD7621 offers a higher maximum throughput, which matters for applications requiring faster conversion rates. |
| Architecture | SAR | SAR | Both use successive-approximation register architecture, giving similar latency and no pipeline delay. |
| Input Type | Differential | Differential | Differential inputs on both parts provide good common-mode rejection and noise immunity. |
| Supply Voltage | 5 V analog / 2.5 V digital | 5 V analog / 2.5 V digital | Matching supply requirements allow the parts to be used in the same power rail design. |
| Interface | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Identical digital interface options simplify drop-in replacement in existing board designs. |
| Package / Case | 48-LQFP | 48-LQFP | Same package footprint enables physical interchangeability on the PCB. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Equivalent industrial temperature range supports use in the same environmental conditions. |
| Power Consumption | ~90 mW typical | ~70 mW typical | The AD7622 draws less power, which can matter in power-sensitive or thermally constrained designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7621ASTZ | AD7622BSTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 3M | 2M |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI, Parallel, DSP | SPI, Parallel, DSP |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 2.37V ~ 2.63V | 2.37V ~ 2.63V |
| Voltage - Supply, Digital | 2.37V ~ 2.63V | 2.37V ~ 2.63V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7621ASTZ and AD7622BSTZRL?
The AD7621ASTZ is a 16-bit, 3 MSPS PulSAR analog-to-digital converter in a 48-lead LQFP package, while the AD7622BSTZRL is a 16-bit, 2 MSPS PulSAR ADC in a 48-lead LQFP package supplied in tape-and-reel format. The primary differences are the maximum throughput rate (3 MSPS vs 2 MSPS) and the packaging format (tray vs tape-and-reel).
Are the AD7621ASTZ and AD7622BSTZRL pin-compatible?
Both devices are offered in the same 48-lead LQFP package, and their pinouts are defined by the same PulSAR family architecture. Designers should still verify the pin function assignments against the respective manufacturer datasheets before considering a direct layout substitution.
What is the resolution and architecture of these ADCs?
Both the AD7621ASTZ and AD7622BSTZRL are 16-bit successive-approximation register (SAR) analog-to-digital converters based on Analog Devices' PulSAR architecture, offering no pipeline delay and high accuracy for precision data acquisition applications.
What are the maximum sampling rates of the AD7621ASTZ and AD7622BSTZRL?
The AD7621ASTZ supports a maximum throughput of 3 MSPS, while the AD7622BSTZRL supports a maximum throughput of 2 MSPS. The higher rate of the AD7621ASTZ may be preferred for faster acquisition systems, whereas the AD7622BSTZRL suits applications where 2 MSPS is sufficient.
What interface do these ADCs use for data output?
Both devices provide a flexible parallel interface for connection to digital hosts such as DSPs and microcontrollers, and they also support serial interface modes. The specific interface configuration should be confirmed in the respective datasheets.
What is the difference between the ASTZ and BSTZRL ordering codes?
The ASTZ suffix on the AD7621ASTZ denotes the package and temperature grade in a tray format, while the BSTZRL suffix on the AD7622BSTZRL denotes the package and temperature grade in a tape-and-reel format. The "RL" designation indicates reel packaging, which is typically used for automated high-volume assembly.
Can the AD7622BSTZRL be used as a drop-in replacement for the AD7621ASTZ?
Because the two devices share the same 16-bit SAR architecture and 48-lead LQFP package, a substitution may be possible in some designs, but the lower 2 MSPS throughput of the AD7622BSTZRL must be acceptable for the application. All timing, interface, and performance parameters should be validated against the manufacturer datasheets before substitution.