Part A
AD7621ASTZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6501 ПКС
- Package
- LQFP-48
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7622BSTZ and AD7621ASTZ are both 16-bit, 2 MSPS PulSAR differential ADCs from Analog Devices in the same 48-lead LQFP package, sharing a compatible serial/parallel interface and reference architecture. The AD7622BSTZ offers a modest speed advantage and a wider specified temperature range, while the AD7621ASTZ provides equivalent core resolution and linearity. The AD7622BSTZ can serve as a functional replacement candidate for the AD7621ASTZ, subject to validation of the timing margin and thermal budget in the target design.
Resolution and Linearity
High match
Sample Rate
Validation required
Package and Pinout
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD7622BSTZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5006 ПКС
- Package
- LQFP-48
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | AD7622BSTZ | AD7621ASTZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Maximum Sampling Rate | 2 MSPS | 3 MSPS | The AD7621 offers a higher throughput, which matters for applications requiring faster conversion cycles. |
| INL (Integral Nonlinearity) | ±1.0 LSB typical / ±2.5 LSB max | ±0.5 LSB typical / ±1.5 LSB max | Better linearity in the AD7621 improves accuracy and reduces distortion in precision measurement systems. |
| SNR (Signal-to-Noise Ratio) | 92 dB typical | 93 dB typical | Higher SNR provides better dynamic range, which is important for high-fidelity signal acquisition. |
| THD (Total Harmonic Distortion) | -100 dB typical | -102 dB typical | Lower THD in the AD7621 yields cleaner spectral performance for AC signal applications. |
| Power Consumption | 90 mW typical | 100 mW typical | Lower power in the AD7622 benefits power-sensitive or thermally constrained designs. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply simplifies board-level power design and allows drop-in compatibility. |
| Package | 48-lead LQFP | 48-lead LQFP | Same package footprint enables direct PCB substitution without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings ensure equivalent environmental robustness for industrial applications. |
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 | AD7621ASTZ | AD7622BSTZ |
|---|---|---|
| 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 primary differences between the AD7622BSTZ and AD7621ASTZ?
The AD7622BSTZ is a 16-bit, 2 MSPS PulSAR analog-to-digital converter, while the AD7621ASTZ is a 16-bit, 3 MSPS PulSAR ADC. Both are pin-compatible in the same 48-lead LQFP package, but the AD7621ASTZ offers a higher maximum throughput rate of 3 MSPS versus 2 MSPS for the AD7622BSTZ. Both devices share the same 16-bit resolution, SAR architecture, and 5 V analog supply with separate digital I/O supply.
Are the AD7622BSTZ and AD7621ASTZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (STZ suffix) package with identical pinout assignments, allowing board-level interchangeability when the system timing and throughput requirements are validated against the respective datasheets.
What is the maximum sampling rate of each device?
The AD7622BSTZ supports a maximum throughput of 2 MSPS. The AD7621ASTZ supports a maximum throughput of 3 MSPS. Both achieve 16-bit resolution with no missing codes.
Do both ADCs use the same analog and digital supply voltages?
Yes. Both the AD7622BSTZ and AD7621ASTZ operate from a 5 V analog supply (AVDD) and a separate 2.5 V digital I/O supply (DVDD), with a dedicated VIO pin for interfacing to host logic. This common supply architecture simplifies migration between the two parts.
What digital interface do the AD7622BSTZ and AD7621ASTZ support?
Both devices provide a flexible parallel interface that supports 16-bit, 8-bit, and serial (SPI/QSPI/MICROWIRE/DSP-compatible) modes. The interface is configured via dedicated pins, allowing direct connection to a wide range of host processors and FPGAs.
Can the AD7621ASTZ be used as a drop-in replacement for the AD7622BSTZ in an existing design?
Because both parts share the same package, pinout, supply requirements, and interface options, the AD7621ASTZ can generally serve as a drop-in replacement for the AD7622BSTZ. However, the higher 3 MSPS throughput of the AD7621ASTZ must be validated against the host interface timing, layout, and signal integrity of the existing design before substitution.
What are the typical applications for these 16-bit PulSAR ADCs?
Both the AD7622BSTZ and AD7621ASTZ are suited for high-speed, high-accuracy data acquisition applications such as medical imaging, instrumentation, spectrum analyzers, ATE (automated test equipment), and industrial process control, where 16-bit resolution and multi-MSample-per-second throughput are required.