Part A
AD7655ASTZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1730 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7655ASTZRL and AD7652ASTZRL share the same LQFP-48 footprint, 16-bit SAR architecture, and serial/parallel interface family, making the AD7652ASTZRL a viable functional substitute for the AD7655ASTZRL in single-channel applications. However, the AD7655ASTZRL provides four simultaneous-sampling channels versus one channel on the AD7652ASTZRL, so multi-channel designs require validation before substitution.
Channel Count
Validation required
Package Type
High match
Resolution
High match
Interface Type
High match
Parts at a glance
Part B
AD7652ASTZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8882 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 | AD7655ASTZRL | AD7652ASTZRL | Why it matters |
|---|---|---|---|
| Number of ADC Input Channels | 4 (2 differential / 4 single-ended, multiplexed) | 1 (single-ended) | Determines how many signal sources can be digitized; the AD7655 supports multiplexed multi-channel acquisition while the AD7652 handles only one channel. |
| Input Configuration | Pseudo-differential / single-ended (multiplexed) | Single-ended (unipolar) | Affects signal conditioning and grounding requirements; pseudo-differential inputs reject common-mode noise better than single-ended inputs. |
| Resolution | 16 bits | 16 bits | Both provide 16-bit resolution, so quantization accuracy is equivalent and neither has an advantage in LSB size. |
| Maximum Throughput (Sample Rate) | 500 kSPS | 500 kSPS | Identical sampling rate means both can capture the same signal bandwidth; throughput is not a differentiator for substitution. |
| Interface Type | Parallel (byte/word) and Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel (byte/word) and Serial (SPI/QSPI/MICROWIRE/DSP) | Both offer the same host interface options, so board-level digital connectivity is compatible between the two parts. |
| Supply Voltage (Analog and Digital) | 5 V analog and 5 V digital (with separate VDRIVE) | 5 V analog and 5 V digital (with separate VDRIVE) | Matching supply requirements allow the same power rails and decoupling to be reused, simplifying a drop-in replacement. |
| Package | 48-lead LQFP | 48-lead LQFP | Identical package and pin count enable the same PCB footprint, which is critical for physical substitutability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range means both are suitable for the same environmental conditions. |
| Power Consumption (Typical) | Approximately 100 mW at 500 kSPS | Approximately 100 mW at 500 kSPS | Comparable power draw means thermal and supply budgeting remain valid when substituting one part for the other. |
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 | AD7655ASTZRL | AD7652ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 500k |
| Number of Inputs | 2, 4 | 1 |
| Input Type | Pseudo-Differential, Single Ended | Pseudo-Differential |
| Data Interface | SPI, Parallel, DSP | SPI, Parallel, DSP |
| Configuration | MUX-S/H-MUX-ADC | S/H-ADC |
| Ratio - S / H: ADC | 2:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Features | Simultaneous Sampling | - |
Frequently asked questions
What are the key differences between the AD7655ASTZRL and AD7652ASTZRL?
The AD7655ASTZRL is a dual-channel, 16-bit, 500 kSPS successive-approximation ADC, while the AD7652ASTZRL is a single-channel, 16-bit, 500 kSPS PulSAR ADC. The AD7655 provides two simultaneous-sampling input channels, whereas the AD7652 offers one channel. Both are offered in a 48-lead LQFP package and operate from a 5 V analog supply with a 2.5 V reference.
Are the AD7655ASTZRL and AD7652ASTZRL pin-compatible?
No. Although both devices are housed in a 48-lead LQFP (ST-48) package, their pin functions differ because the AD7655 is a dual-channel converter and the AD7652 is a single-channel converter. The pinouts are not interchangeable, so each device requires its own PCB layout per the respective datasheet.
Do both parts support the same sampling rate and resolution?
Yes. Both the AD7655ASTZRL and AD7652ASTZRL provide 16-bit resolution with a maximum throughput of 500 kSPS, making them comparable in conversion speed and accuracy class despite their channel-count difference.
What analog input configurations does each device support?
The AD7655 provides two independent input channels that can be configured for either simultaneous sampling or sequential conversion, with software-selectable input ranges. The AD7652 provides a single input channel with a software-selectable input range. Designers should confirm the exact range and configuration options in the respective datasheets.
Can the AD7652ASTZRL be used as a drop-in replacement for the AD7655ASTZRL?
No. Because the AD7655 is dual-channel and the AD7652 is single-channel, and their pinouts differ, the AD7652 cannot directly replace the AD7655 on an existing PCB. A redesign of the analog front end and layout would be required, and the loss of the second channel must be acceptable for the application.
What are the package and temperature range specifications for both parts?
Both the AD7655ASTZRL and AD7652ASTZRL are supplied in a 48-lead LQFP package and are specified for the industrial temperature range of −40°C to +85°C, per the Analog Devices datasheets.
What supply and reference requirements do these ADCs share?
Both devices operate from a 5 V analog supply (AVDD) and a 2.5 V reference, and both include an internal reference buffer. The digital interface supply (DVDD) supports 2.7 V to 5.25 V operation. Designers should verify the exact supply and reference specifications in the respective datasheets before finalizing the design.