Part A
AD7621ASTZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6501 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7621ASTZ and AD7623ASTZRL are both 16-bit, 1 MSPS PulSAR analog-to-digital converters from Analog Devices in the same 48-lead LQFP package, sharing identical resolution, sampling rate, and supply architecture. The AD7623ASTZRL is a functionally compatible replacement candidate for the AD7621ASTZ, though the differing analog input configuration and interface timing details should be validated against the target design before substitution.
Resolution and Sampling Rate
High match
Package and Pin Configuration
High match
Analog Input Configuration
Validation required
Digital Interface Timing
Validation required
Parts at a glance
Part B
AD7623ASTZRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8788 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7623ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is identical and does not affect substitutability. |
| Sampling Rate | 3 MSPS | 1.33 MSPS | The AD7621 supports a higher 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 interface options mean either part can connect to the same host processor without redesign. |
| Package | 48-Lead LQFP | 48-Lead LQFP | Same package and pinout enable drop-in replacement on an existing PCB footprint. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature range supports use in the same environmental conditions. |
| Power Consumption | ~90 mW typical | ~70 mW typical | Lower power in the AD7623 benefits power-sensitive designs, though both are in a similar class. |
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 | AD7623ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 3M | 1.33M |
| 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 AD7623ASTZRL?
Both are 16-bit, 1 MSPS/2 MSPS successive-approximation ADCs from Analog Devices in a 48-lead LQFP package. The AD7621ASTZ is specified for 1 MSPS operation, while the AD7623ASTZRL is a 2 MSPS device. The AD7623ASTZRL is supplied in tape-and-reel packaging (RL suffix), whereas the AD7621ASTZ is a tray-style part. Both share the same pinout and package footprint, but the maximum throughput rate and packaging differ.
Are the AD7621ASTZ and AD7623ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (STZ) package with identical pin assignments, so they are pin-compatible. However, pin compatibility does not guarantee functional interchangeability without validating timing, throughput, and configuration differences.
Can the AD7623ASTZRL be used as a drop-in replacement for the AD7621ASTZ?
Not unconditionally. Although the package and pinout match, the AD7623ASTZRL supports a higher maximum throughput (2 MSPS versus 1 MSPS for the AD7621ASTZ). The replacement must be validated against the system's timing, clock, and interface requirements, and the design must not rely on parameters that differ between the two datasheets.
What is the resolution and architecture of these ADCs?
Both the AD7621ASTZ and AD7623ASTZRL are 16-bit successive-approximation register (SAR) analog-to-digital converters. They provide 16-bit resolution with no pipeline latency, making them suitable for precision data-acquisition and industrial control applications.
What is the maximum sampling rate of each device?
The AD7621ASTZ is specified for a maximum throughput of 1 MSPS. The AD7623ASTZRL is specified for a maximum throughput of 2 MSPS. The higher rate of the AD7623ASTZRL requires the host system to support the corresponding clock and interface timing.
What analog input configuration do these converters support?
Both devices provide a differential analog input and integrate an on-chip track-and-hold amplifier. They are designed for precision AC and DC signal acquisition and support a full-scale input range defined in the respective Analog Devices datasheets.
What digital interface do the AD7621ASTZ and AD7623ASTZRL use?
Both parts provide a parallel digital output interface compatible with standard microprocessor and DSP buses, along with a serial interface option. The exact interface mode, timing, and configuration must be confirmed against the specific Analog Devices datasheet for each part number.
What package and operating temperature range do these parts use?
Both the AD7621ASTZ and AD7623ASTZRL are supplied in a 48-lead LQFP package. The STZ suffix denotes the LQFP package and the industrial temperature grade. Designers should confirm the exact specified temperature range in the Analog Devices datasheet for each device before finalizing thermal and reliability calculations.