Part A
AD7665ASTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3003 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7665ASTZ and AD7666ASTZRL are both 16-bit, 570 kSPS PulSAR analog-to-digital converters from Analog Devices in the same 48-lead LQFP package, sharing identical core resolution, throughput, and supply architecture. The AD7666ASTZRL adds an internal reference and reference buffer, which the AD7665ASTZ requires externally, so the two are functionally interchangeable in most designs provided the reference configuration is reviewed. The AD7666ASTZRL is a viable functional replacement candidate for the AD7665ASTZ, with validation recommended for reference-dependent circuitry.
Resolution and Throughput
High match
Package and Pinout
High match
Reference Architecture
Validation required
Supply and Interface
High match
Parts at a glance
Part B
AD7666ASTZRL
Hittite
- Lifecycle
- Active
- Stock
- 3652 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Analog to Digital Converters (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 | AD7665ASTZ | AD7666ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate | 570 kSPS | 500 kSPS | The AD7665 offers a higher maximum throughput, which matters if the application needs faster conversion rates. |
| Number of Input Channels | 4 (single-ended) / 2 (differential) | 2 (single-ended) / 1 (differential) | The AD7665 supports more input channels, enabling multiplexed multi-signal acquisition that the AD7666 cannot match. |
| Input Type | Single-ended / Differential | Single-ended / Differential | Both support both input configurations, so this is not a differentiator. |
| Interface | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Identical interface options mean either part can drop into the same digital host connection. |
| Supply Voltage (Analog) | 5 V | 5 V | Same analog supply requirement, so power rail design is unchanged between the two. |
| Package / Case | 48-LQFP | 48-LQFP | Identical package and footprint allow direct board-level substitution without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range, so environmental suitability is equivalent. |
| Power Consumption | Typical 87 mW at 5 V | Typical 77 mW at 5 V | The AD7666 draws slightly less power, which can matter in power-sensitive or thermally constrained designs. |
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 | AD7665ASTZ | AD7666ASTZRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 570k | 500k |
| 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 | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Features | True Bipolar | - |
Frequently asked questions
What are the key differences between the AD7665ASTZ and AD7666ASTZRL?
Both are 16-bit, 570 kSPS PulSAR analog-to-digital converters from Analog Devices in a 48-lead LQFP package. The AD7665ASTZ is a single-channel device with a parallel interface, while the AD7666ASTZRL is a two-channel (simultaneous sampling) device offered in tape-and-reel packaging. The AD7666 provides two simultaneous-sampling ADCs, whereas the AD7665 provides one.
Are the AD7665ASTZ and AD7666ASTZRL pin-compatible?
No. Although both use the same 48-lead LQFP package, the AD7666 is a dual simultaneous-sampling converter and the AD7665 is a single-channel converter, so their pin functions and internal signal routing differ. A direct drop-in replacement should not be assumed without reviewing both datasheets.
What is the resolution and throughput of these converters?
Both the AD7665ASTZ and AD7666ASTZRL are 16-bit successive-approximation (SAR) ADCs with a maximum throughput of 570 kSPS.
What analog input range do the AD7665ASTZ and AD7666ASTZRL support?
Both devices support a bipolar ±10 V input range (with a 5 V reference) as well as other configured ranges per the datasheet, making them suitable for industrial and instrumentation signal chains.
What digital interface do these ADCs provide?
The AD7665ASTZ provides a parallel digital interface. The AD7666ASTZRL provides a parallel interface for its dual simultaneous-sampling channels. Both are compatible with standard microprocessor and DSP buses per the manufacturer datasheet.
What is the difference in packaging between AD7665ASTZ and AD7666ASTZRL?
Both are supplied in a 48-lead LQFP. The AD7665ASTZ is typically supplied in tray/standard packaging, while the AD7666ASTZRL suffix indicates tape-and-reel packaging intended for automated assembly.
Can the AD7666ASTZRL replace the AD7665ASTZ in an existing design?
Not directly. The AD7666 is a dual simultaneous-sampling converter while the AD7665 is single-channel, so channel count, pin functions, and PCB layout differ. Replacement requires design validation against both datasheets.
What are typical applications for these converters?
Both are suited to industrial process control, instrumentation, medical instrumentation, and data acquisition systems requiring 16-bit resolution at up to 570 kSPS. The AD7666ASTZRL's dual simultaneous sampling is advantageous for applications needing phase-coherent multi-channel acquisition.