Part A
AD7656BSTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3438 PCS
- Package
- LQFP-64
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Not a drop-in replacement
The AD7656BSTZ and AD7652ASTZRL are not drop-in replacements for one another. The AD7656BSTZ is a six-channel simultaneous-sampling bipolar ADC in a 64-lead LQFP, while the AD7652ASTZRL is a single-channel unipolar ADC in a 48-lead LQFP. They differ in channel count, input configuration, package footprint, and digital interface, so a direct board-level substitution is not possible without redesign.
Different channel count
Different input configuration
Different footprint
Different digital interface
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 | AD7656BSTZ | AD7652ASTZRL | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 6 | 1 | Determines how many independent analog signals can be sampled simultaneously; a 6-channel part cannot be substituted by a single-channel part in multi-channel systems. |
| Resolution | 16 bit | 16 bit | Both provide 16-bit resolution, so precision level is equivalent, but channel count and architecture still differ. |
| Sampling Rate | 250 kSPS | 500 kSPS | Higher sampling rate supports faster signal acquisition; the AD7652 can capture higher-bandwidth signals than the AD7656. |
| Input Type | Single-ended (bipolar) | Single-ended (bipolar) | Input configuration affects signal conditioning requirements; both accept bipolar single-ended inputs, easing direct substitution at the interface level. |
| Interface | Parallel / Serial (SPI) | Parallel / Serial (SPI) | Matching interfaces allow connection to the same host controller, though the AD7656 exposes more channels over the bus. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Identical supply requirements simplify power-rail reuse when considering substitution. |
| Package | 64-lead LQFP | 48-lead LQFP | Different footprints and pin counts mean the parts are not drop-in compatible on the same PCB. |
| Power Consumption | ~160 mW (typical) | ~90 mW (typical) | Lower power per channel and overall consumption affect thermal design and energy budget in portable or dense systems. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature ratings mean both suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7656BSTZ | AD7652ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | iCMOS® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 500k |
| Number of Inputs | 6 | 1 |
| Input Type | Single Ended | Pseudo-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 | 6 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | 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, True Bipolar | - |
Frequently asked questions
What are the key differences between the AD7656BSTZ and AD7652ASTZRL?
The AD7656BSTZ is a 16-bit, 6-channel, simultaneous-sampling SAR ADC with a 250 kSPS throughput rate, while the AD7652ASTZRL is a 16-bit, single-channel, successive-approximation ADC with a 500 kSPS throughput rate. The AD7656BSTZ offers six simultaneous sampling channels in a 64-lead LQFP package, whereas the AD7652ASTZRL provides one channel in a 48-lead LQFP package.
Are the AD7656BSTZ and AD7652ASTZRL pin-compatible or package-compatible?
No. The AD7656BSTZ is supplied in a 64-lead LQFP package, and the AD7652ASTZRL is supplied in a 48-lead LQFP package. The differing lead counts and pin assignments prevent direct PCB footprint compatibility between the two devices.
Can the AD7656BSTZ and AD7652ASTZRL be used interchangeably in an existing design?
No. The two devices differ in channel count (6 vs 1), package (64-lead LQFP vs 48-lead LQFP), throughput (250 kSPS vs 500 kSPS), and pinout. A direct substitution is not possible without redesigning the PCB layout and validating the system against the respective datasheets.
What are the resolution and throughput specifications of each device?
Both devices offer 16-bit resolution. The AD7656BSTZ provides a throughput rate of 250 kSPS with six simultaneous-sampling channels, while the AD7652ASTZRL provides a throughput rate of 500 kSPS on a single channel.
What input voltage ranges do the AD7656BSTZ and AD7652ASTZRL support?
The AD7656BSTZ supports selectable input ranges of ±10 V, ±5 V, and 0 V to 10 V. The AD7652ASTZRL supports a 0 V to 2.5 V unipolar input range with a 2.5 V reference. Designers should confirm the exact range configuration against the respective manufacturer datasheets for their target application.
Which device is better suited for simultaneous multi-channel acquisition?
The AD7656BSTZ is the appropriate choice for simultaneous multi-channel acquisition because it integrates six simultaneous-sampling SAR ADCs, allowing six channels to be sampled at the same instant. The AD7652ASTZRL is a single-channel ADC and cannot perform simultaneous multi-channel sampling on its own.
What are the typical applications for each device?
The AD7656BSTZ is typically used in power-line monitoring, motor control, and multi-phase power measurement systems that require simultaneous sampling of multiple channels. The AD7652ASTZRL is typically used in single-channel data acquisition, instrumentation, and industrial control applications where a higher per-channel throughput is needed.
Do both devices support a parallel or serial digital interface?
Both devices provide a flexible parallel and serial digital interface for connection to DSPs and microcontrollers. Designers should verify the specific interface mode, timing, and configuration options in the respective manufacturer datasheets before finalizing the system design.