Part A
AD7622BSTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5006 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7622BSTZ and AD7621ASTZRL 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 AD7622BSTZ offers a higher throughput of 2 MSPS versus 1 MSPS for the AD7621ASTZRL, so it can serve as a functional replacement where the faster conversion rate is acceptable, while the AD7621ASTZRL remains suitable for lower-speed designs. Pinout and package compatibility support drop-in evaluation, but the differing sample rate and slightly different SNR/SINAD performance should be validated against the target application requirements before final qualification.
Resolution and Linearity
High match
Package and Pinout
High match
Sample Rate
Validation required
Dynamic Performance
Validation required
Parts at a glance
Part B
AD7621ASTZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7199 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD7621ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Sampling Rate | 2 MSPS | 3 MSPS | The AD7621 offers a higher maximum throughput, which matters for higher-bandwidth signal acquisition. |
| 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 support similar signal-chain topologies and common-mode rejection. |
| Supply Voltage (Analog) | 5 V | 5 V | Matching analog supply requirements simplifies power-rail reuse in a drop-in replacement. |
| Interface | SPI / Parallel | SPI / Parallel | Both support serial and parallel interfaces, allowing flexible digital host connectivity. |
| Package | 48-LQFP | 48-LQFP | Identical package and footprint enable direct board-level substitution without layout changes. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Same industrial temperature range ensures equivalent environmental suitability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7622BSTZ | AD7621ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 2M | 3M |
| 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 AD7622BSTZ and the AD7621ASTZRL?
The AD7622BSTZ is a 16-bit, 2 MSPS PulSAR analog-to-digital converter, while the AD7621ASTZRL is a 16-bit, 3 MSPS PulSAR ADC. The AD7621ASTZRL offers a higher maximum throughput rate (3 MSPS vs 2 MSPS) and is supplied in a 48-lead LQFP package, whereas the AD7622BSTZ is supplied in a 48-lead LQFP package as well. Both are pin-compatible members of the same PulSAR family, but the AD7621ASTZRL provides faster sampling and is specified for operation over the -40°C to +85°C industrial temperature range.
Are the AD7622BSTZ and AD7621ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP package and share the same pinout, which allows the AD7621ASTZRL to be used as a higher-speed drop-in replacement for the AD7622BSTZ in existing 48-lead LQFP designs, provided the system timing and power budget support the higher 3 MSPS throughput.
What is the maximum sampling rate of each device?
The AD7622BSTZ has a maximum throughput of 2 MSPS. The AD7621ASTZRL has a maximum throughput of 3 MSPS. Both are 16-bit, charge-redistribution successive-approximation (SAR) ADCs with no pipeline delay.
Do both converters support the same analog input range and interface?
Yes. Both the AD7622BSTZ and AD7621ASTZRL feature a differential analog input with a full-scale range of ±VREF (typically ±2.5 V with a 2.5 V reference) and provide a parallel interface for data output. Both also support a serial interface option, allowing flexible connection to DSPs, FPGAs, and microcontrollers.
What are the power supply requirements for these ADCs?
Both devices operate from a 5 V analog supply (AVDD) and a 2.5 V digital supply (DVDD), with a separate VIO supply for the digital I/O interface. The AD7621ASTZRL, operating at its higher 3 MSPS rate, typically dissipates more power than the AD7622BSTZ at 2 MSPS, so the system power budget should be verified against the respective datasheets.
What are the typical applications for the AD7622BSTZ and AD7621ASTZRL?
Both 16-bit PulSAR ADCs are suited to high-accuracy data acquisition, medical imaging, instrumentation, spectrum analyzers, and industrial automation. The AD7621ASTZRL's higher 3 MSPS throughput makes it preferable for applications requiring faster signal capture, such as advanced medical imaging and high-speed control loops, while the AD7622BSTZ at 2 MSPS suits applications where 2 MSPS is sufficient and lower power is beneficial.
What package and temperature grade do these parts use?
Both the AD7622BSTZ and AD7621ASTZRL are supplied in a 48-lead LQFP package and are specified for the industrial temperature range of -40°C to +85°C. The "Z" suffix in both part numbers indicates RoHS-compliant packaging.
Can the AD7621ASTZRL directly replace the AD7622BSTZ in an existing design?
Because both devices share the same 48-lead LQFP pinout and interface, the AD7621ASTZRL can serve as a drop-in replacement for the AD7622BSTZ when the design can accommodate the higher 3 MSPS throughput and the associated power and timing requirements. The system clock, digital interface timing, and power budget should be re-validated against the AD7621ASTZRL datasheet before substitution.