Part A
AD7667ASTZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6318 個数
- Package
- LQFP-48
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7667ASTZ and AD7665ASTRL are both 16-bit successive-approximation ADCs from Analog Devices in the same LQFP-48 package family, sharing a parallel interface and comparable analog input architecture. The AD7667ASTZ offers a higher maximum sampling rate (1 MSPS versus 570 kSPS) and a wider analog supply range, so it can generally serve as a functional substitute for the AD7665ASTRL where the higher throughput and supply headroom are acceptable. Designers should confirm timing, reference, and power-supply details against the target application before final qualification.
Resolution and Architecture
High match
Package Type
High match
Maximum Sampling Rate
Validation required
Supply Voltage Range
Validation required
Parts at a glance
Part B
AD7665ASTRL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 8771 個数
- Package
- LQFP-48
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7665ASTRL | 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 | 1 MSPS | 570 kSPS | The AD7667 offers a higher throughput, which matters for applications requiring faster conversion rates. |
| Number of Input Channels | 1 (single-ended) | 4 (multiplexed) | The AD7665 provides a 4-channel multiplexer, enabling multi-signal acquisition, while the AD7667 is single-channel. |
| Input Type | Single-ended | Differential (with single-ended option) | Differential inputs improve noise immunity and dynamic performance; the AD7665 supports both configurations. |
| Interface | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Both offer flexible parallel and serial interfaces, so digital host compatibility is equivalent. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply requirements simplify power design when substituting. |
| Package | 48-lead LQFP | 48-lead LQFP | Same package and pin count allow potential board-level drop-in compatibility. |
| Power Consumption | ~87 mW typical | ~80 mW typical | Lower power in the AD7665 benefits power-sensitive designs, though both are in a similar range. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | Matching linearity specifications indicate comparable accuracy performance. |
| SNR (Signal-to-Noise Ratio) | ~90 dB | ~90 dB | Equivalent SNR means similar dynamic range and noise performance for both parts. |
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 | AD7665ASTRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Series | PulSAR® | - |
| Sampling Rate(Per Second) | 1M | - |
| Number of Inputs | 1 | - |
| Input Type | Pseudo-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, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD7667ASTZ and AD7665ASTRL?
The AD7667ASTZ is a 16-bit, 1 MSPS PulSAR analog-to-digital converter, while the AD7665ASTRL is a 16-bit, 570 kSPS PulSAR ADC. Both are pin-compatible members of the same Analog Devices PulSAR family and share a 48-lead LQFP package, but they differ in maximum throughput rate and therefore in their internal timing and power scaling characteristics.
Are the AD7667ASTZ and AD7665ASTRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package and belong to the same PulSAR family, so they share a common pinout. This allows a single PCB layout to accommodate either device, provided the system timing and throughput requirements are validated for the lower-speed AD7665ASTRL.
What is the maximum sampling rate of each device?
The AD7667ASTZ supports a maximum throughput of 1 MSPS. The AD7665ASTRL supports a maximum throughput of 570 kSPS. The higher rate of the AD7667ASTZ requires correspondingly faster digital timing and a higher-speed serial clock or parallel read cycle.
Do both parts offer the same resolution and interface options?
Yes. Both are 16-bit successive-approximation ADCs offering a parallel interface and a serial interface, with the serial interface supporting both SPI-compatible and daisy-chain configurations. Both also provide a flexible parallel word width. The primary distinction between the two parts is throughput, not resolution or interface architecture.
Can the AD7665ASTRL be used as a drop-in replacement for the AD7667ASTZ?
It can be considered only if the system's maximum required sampling rate is 570 kSPS or lower and all timing, power, and configuration parameters are re-validated against the AD7665ASTRL datasheet. Because the AD7667ASTZ supports 1 MSPS, substituting the slower AD7665ASTRL in a design that requires full 1 MSPS throughput is not acceptable.
How do the power consumption figures compare?
Both devices scale power with throughput, so the AD7667ASTZ, operating at up to 1 MSPS, dissipates more power at full rate than the AD7665ASTRL at its 570 kSPS maximum. Exact supply current and power figures should be taken from the respective Analog Devices datasheets, since they depend on operating mode, reference configuration, and interface settings.
What package and temperature grade do these parts use?
Both the AD7667ASTZ and AD7665ASTRL are supplied in the 48-lead LQFP package. The "Z" suffix on AD7667ASTZ denotes RoHS-compliant lead finish per Analog Devices ordering conventions. Designers should confirm the exact temperature grade and ordering code from the manufacturer's product page before finalizing a bill of materials.
Which part should be selected for a new design?
Selection depends on the required throughput. Choose the AD7667ASTZ when sampling rates up to 1 MSPS are needed; choose the AD7665ASTRL when 570 kSPS is sufficient and lower power or cost at reduced rate is preferred. In both cases, verify ac performance, reference requirements, and digital timing against the specific datasheet for the target design.