Part A
AD7663ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5007 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7665ASTRL is a viable functional replacement candidate for the AD7663ASTZ, sharing the same 16-bit SAR architecture, 48-lead LQFP package, and identical pinout. Designers should validate the higher throughput requirement and confirm timing margins in the target application before final qualification.
Resolution and Architecture
High match
Package and Pinout
High match
Sample Rate
Validation required
Supply Voltage and Interface
High match
Parts at a glance
Part B
AD7665ASTRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8771 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 | AD7663ASTZ | AD7665ASTRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both are 16-bit SAR ADCs, so nominal resolution is equivalent for precision applications. |
| Sampling Rate | 250 kSPS | 570 kSPS | Higher throughput in the AD7665 allows faster signal acquisition and wider bandwidth in the system. |
| Number of Input Channels | 2 (differential/single-ended) | 4 (differential/single-ended) | More channels in the AD7665 enables multiplexed multi-signal acquisition without external muxing. |
| Input Type | Differential, pseudo-differential, single-ended | Differential, pseudo-differential, single-ended | Flexible input configurations support a range of sensor and signal-chain topologies. |
| Supply Voltage (Analog) | 5 V | 5 V | Matching analog supply simplifies power-rail design when substituting parts. |
| Interface | Parallel, Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel, Serial (SPI/QSPI/MICROWIRE/DSP) | Identical digital interfaces allow drop-in compatibility with existing host controllers. |
| Package / Case | 48-LQFP | 48-LQFP | Same package footprint enables PCB-level interchangeability without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Equivalent industrial temperature range supports the same environmental conditions. |
| Power Consumption | ~75 mW typical | ~90 mW typical | Lower power in the AD7663 benefits thermally constrained or battery-powered designs. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7663ASTZ | AD7665ASTRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Series | PulSAR® | - |
| Sampling Rate(Per Second) | 250k | - |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Data Interface | SPI, Parallel, DSP | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Number of A/D Converters | 1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
| Features | True Bipolar | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD7663ASTZ and AD7665ASTRL?
The AD7663ASTZ is a 16-bit, 250 kSPS PulSAR analog-to-digital converter, while the AD7665ASTRL is a 16-bit, 570 kSPS PulSAR ADC. The AD7665ASTRL offers a higher maximum sampling rate, but both devices share a similar architecture and are available in 48-lead LQFP packages. The AD7663ASTZ is specified for operation from a 5 V supply with a 2.5 V reference, whereas the AD7665ASTRL operates from a 5 V supply and supports a 2.5 V reference as well. Designers should verify the exact timing, power, and interface requirements from the respective datasheets before substitution.
Are the AD7663ASTZ and AD7665ASTRL pin-compatible?
Both devices are offered in a 48-lead LQFP package, and their pinouts are closely related but not identical in all respects. The AD7663ASTZ and AD7665ASTRL share the same package footprint, but the pin functions and configuration options may differ. A direct drop-in replacement should only be attempted after comparing the pin descriptions and timing diagrams in the official Analog Devices datasheets for both parts.
Can the AD7663ASTZ be replaced by the AD7665ASTRL in an existing design?
Replacement is possible only after validating all differences against the manufacturer datasheets. The AD7665ASTRL provides a higher throughput (570 kSPS vs. 250 kSPS for the AD7663ASTZ), which may require changes to the digital interface timing, clocking, and PCB layout. Power consumption, reference requirements, and configuration pin settings must also be verified. Do not substitute without confirming that the host system can accommodate the faster conversion rate and any pin-function differences.
What are the resolution and throughput specifications of these ADCs?
Both the AD7663ASTZ and AD7665ASTRL are 16-bit successive-approximation (SAR) ADCs. The AD7663ASTZ has a maximum throughput of 250 kSPS, while the AD7665ASTRL supports up to 570 kSPS. These values are specified in the respective Analog Devices datasheets and should be used as the basis for any performance comparison.
Do both parts support the same analog input ranges and reference voltage?
The AD7663ASTZ and AD7665ASTRL both support a 2.5 V reference and offer similar analog input configurations, including differential and single-ended options. However, the exact input range and reference buffer requirements may differ between the two devices. Always consult the official datasheets to confirm the supported input spans and reference specifications for each part before designing a common analog front end.
What package and operating temperature range do these devices use?
Both the AD7663ASTZ and AD7665ASTRL are supplied in a 48-lead LQFP package. The AD7663ASTZ is specified over the industrial temperature range of −40°C to +85°C. The AD7665ASTRL is also specified over the industrial temperature range of −40°C to +85°C. These values are taken from the Analog Devices datasheets and should be verified for the specific grade ordered.
How do the power consumption figures compare between the AD7663ASTZ and AD7665ASTRL?
The AD7663ASTZ typically consumes about 35 mW at 250 kSPS with a 5 V supply, while the AD7665ASTRL typically consumes about 70 mW at 570 kSPS with a 5 V supply. The higher power of the AD7665ASTRL is consistent with its higher throughput. Designers should refer to the official datasheets for exact power-down and standby current specifications before finalizing thermal and power budgets.
What digital interface options are available on these ADCs?
Both the AD7663ASTZ and AD7665ASTRL provide a parallel digital interface and support serial interface modes. The AD7665ASTRL, with its higher sampling rate, may require faster digital timing and careful attention to bus timing margins. The exact interface modes, timing parameters, and configuration pin settings are documented in the respective Analog Devices datasheets and must be reviewed before integrating either part into a system.