Part A
AD7667ASTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6318 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7667ASTZ and AD7666ASTZRL are both 16-bit, 1 MSPS PulSAR analog-to-digital converters from Analog Devices in a 48-lead LQFP package, sharing the same core architecture, supply requirements, and digital interface. The AD7667ASTZ is a strong functional replacement candidate for the AD7666ASTZRL, with the primary distinction being the AD7667's integrated internal reference versus the AD7666's reliance on an external reference, which must be validated against the target design's reference strategy.
Resolution and Sample Rate
High match
Package and Pinout
High match
Digital Interface
High match
Reference Architecture
Validation required
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 | AD7667ASTZ | 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 | 1 MSPS | 500 kSPS | The AD7667 offers twice the throughput, which matters for higher-bandwidth signal acquisition and faster system update rates. |
| Number of Input Channels | 1 (single-ended) | 2 (single-ended, multiplexed) | The AD7666 provides a 2-channel multiplexer, allowing multiple signals to be sampled by one ADC, whereas the AD7667 is single-channel. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so the analog front-end topology requirement is the same. |
| Interface | Parallel / Serial (SPI-compatible) | Parallel / Serial (SPI-compatible) | Identical digital interface options simplify drop-in replacement at the host processor side. |
| Supply Voltage (Analog) | 5 V | 5 V | Same analog supply simplifies power rail design and ensures comparable input range behavior. |
| Package | 48-lead LQFP | 48-lead LQFP | Identical package and pin count support PCB footprint compatibility for substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range means both suit the same environmental conditions. |
| Power Consumption | ~87 mW (typical) | ~77 mW (typical) | Lower power in the AD7666 can matter for thermally constrained or battery-influenced designs, though both are 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 | AD7667ASTZ | AD7666ASTZRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 500k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-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 | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7667ASTZ and AD7666ASTZRL?
Both are 16-bit, 1 MSPS successive-approximation ADCs from Analog Devices in a 48-lead LQFP package, but they differ in input configuration and interface. The AD7667 is a unipolar/bipolar pseudo-differential input device with a parallel interface, while the AD7666 is a true differential input device with a parallel interface. The AD7666ASTZRL is the tape-and-reel packaging variant of the AD7666ASTZ.
Are the AD7667ASTZ and AD7666ASTZRL pin-compatible?
No. Although both use the same 48-lead LQFP package, the AD7667 and AD7666 have different analog input architectures (pseudo-differential vs. true differential), so the analog input pin functions and external signal conditioning requirements differ. A direct drop-in replacement should not be assumed without reviewing both datasheets.
What is the resolution and throughput of these ADCs?
Both the AD7667 and AD7666 are 16-bit successive-approximation analog-to-digital converters with a maximum throughput of 1 MSPS, per Analog Devices datasheets.
What is the difference between the AD7666ASTZ and AD7666ASTZRL ordering codes?
The AD7666ASTZ is the standard tray packaging option, while the AD7666ASTZRL suffix indicates tape-and-reel packaging for automated assembly. The silicon device, specifications, and 48-lead LQFP package are the same; only the shipping/packaging format differs.
Do the AD7667ASTZ and AD7666ASTZRL support the same digital interface?
Both devices provide a parallel digital output interface for connection to a host processor or DSP. However, the exact interface timing, control pin functions, and configuration options should be verified against each device's respective datasheet before designing a common interface.
Can the AD7667ASTZ and AD7666ASTZRL operate from the same supply voltages?
Both devices are specified for a 5 V analog supply with a separate digital supply (typically 2.7 V to 5 V) for the interface, per Analog Devices datasheets. Designers should confirm the exact supply and reference requirements for each part in the official datasheet before sharing a power rail design.
Which part should be selected for a differential-input application?
The AD7666ASTZRL is the appropriate choice for true differential input applications, as the AD7666 is specified with a differential analog input. The AD7667 provides pseudo-differential input capability and is better suited to single-ended or pseudo-differential signal chains.