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 is a higher-resolution member of the same Analog Devices PulSAR family as the AD7665ASTZ, sharing the identical 48-lead LQFP footprint, pinout, and 5 V supply architecture. It is a strong functional upgrade candidate where the design can accommodate the tighter SNR and reduced throughput trade-offs, but it is not a bit-for-bit drop-in substitute without validating timing and noise margins.
Package and Pinout
High match
Resolution and Accuracy
Validation required
Sampling Rate
Not compatible
Supply and Interface
High match
Parts at a glance
Part B
AD7665ASTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3003 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 | AD7667ASTZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate | 570 kSPS | 1 MSPS | The AD7667 offers a higher maximum throughput, which matters for applications requiring faster conversion rates. |
| Number of Input Channels | 4 (single-ended) / 2 (differential) | 1 (single-ended) / 1 (differential) | The AD7665 supports multiplexed multi-channel input, while the AD7667 is single-channel, affecting system architecture and channel count. |
| Input Type | Single-ended or differential (multiplexed) | Single-ended or differential | Both support differential inputs, but the AD7665 adds multiplexed channel selection, which changes front-end design requirements. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply requirements mean the same power rail can be used for either device. |
| Interface | Parallel and Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel and Serial (SPI/QSPI/MICROWIRE/DSP) | Both offer flexible parallel and serial interfaces, so digital host connectivity is compatible between the two parts. |
| Package | 48-lead LQFP | 48-lead LQFP | Identical package and pin count allow potential board-level drop-in compatibility, though pin functions may differ. |
| Power Consumption | ~87 mW typical | ~100 mW typical | Lower power in the AD7665 benefits power-sensitive designs, while the AD7667 trades slightly higher power for higher speed. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | Matching linearity specifications indicate comparable accuracy performance for precision measurement applications. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature ranges mean both parts suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7667ASTZ | AD7665ASTZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 570k |
| 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 |
| 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 primary differences between the AD7665ASTZ and AD7667ASTZ?
Both are 16-bit, 570 kSPS PulSAR analog-to-digital converters from Analog Devices in a 48-lead LQFP package. The AD7665ASTZ provides a parallel interface and a serial interface, while the AD7667ASTZ provides a parallel interface only. The AD7665ASTZ also includes a serial data output and a separate serial clock, whereas the AD7667ASTZ is parallel-only. Both share the same core architecture, package, and pinout family, but the digital interface options differ.
Are the AD7665ASTZ and AD7667ASTZ pin-compatible?
Yes, both devices are offered in the same 48-lead LQFP (STZ) package and share the same pinout family. However, because the AD7667ASTZ is parallel-only, some pins that serve serial functions on the AD7665ASTZ may be unused or have different functions on the AD7667ASTZ. Designers should verify pin functions against the respective datasheets before substituting one for the other.
Do both parts offer the same resolution and throughput?
Yes. Both the AD7665ASTZ and AD7667ASTZ are 16-bit successive-approximation (SAR) ADCs with a maximum throughput of 570 kSPS. They share the same core converter performance, including 16-bit no-missing-codes resolution and similar AC and DC accuracy specifications as documented in the Analog Devices datasheets.
What digital interfaces does each part support?
The AD7665ASTZ supports both a parallel interface and a serial interface (with serial data output and serial clock). The AD7667ASTZ supports a parallel interface only. Systems requiring a serial interface should select the AD7665ASTZ, while parallel-only designs can use either device.
Can the AD7667ASTZ be used as a drop-in replacement for the AD7665ASTZ?
Not unconditionally. Although both share the same package and core converter, the AD7667ASTZ lacks the serial interface present on the AD7665ASTZ. A drop-in replacement is only valid if the target design uses the parallel interface exclusively and all pin functions are verified against the AD7667ASTZ datasheet. Designs relying on serial communication must retain the AD7665ASTZ.
Do both devices operate from the same supply voltages?
Yes. Both the AD7665ASTZ and AD7667ASTZ operate from a 5 V analog supply (AVDD) and a separate digital supply (DVDD) that supports 2.7 V to 5 V logic interfacing, as specified in the Analog Devices datasheets. This allows direct connection to both 3 V and 5 V digital systems.
Are the AD7665ASTZ and AD7667ASTZ specified over the same temperature range?
Yes. Both devices are specified for operation over the industrial temperature range of −40°C to +85°C, consistent with the Analog Devices datasheet specifications for the STZ (LQFP) package options.