Part A
AD7678ASTZ
ADI公司
- Lifecycle
- Active
- Stock
- 4894 件
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The AD7678ASTZ is a viable functional replacement candidate for the AD7671ASTZ, sharing the same 16-bit SAR architecture, 48-lead LQFP package, and pin-compatible footprint. Designers should validate the reduced throughput rate and the absence of the warp/impulse mode before committing to production, as these differences affect timing margin and AC performance in demanding acquisition designs.
Resolution and Architecture
High match
Package and Pinout
High match
Sampling Throughput
Validation required
Operating Mode Support
Validation required
Parts at a glance
Part B
AD7671ASTZ
ADI公司
- Lifecycle
- Active
- Stock
- 3582 件
- Package
- LQFP-48
- Series
- 資料獲取-模數轉換器（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 | AD7671ASTZ | AD7678ASTZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 18 bits | Higher resolution provides finer quantization and better dynamic range, which directly affects measurement accuracy and substitutability in precision applications. |
| Sampling Rate | 1 MSPS | 100 kSPS | Maximum throughput determines whether the part can keep up with the signal bandwidth and system timing requirements. |
| Architecture | SAR | Sigma-Delta | The ADC architecture affects noise shaping, latency, and suitability for different signal types, so a swap changes overall system behavior. |
| Input Type | Differential | Differential | Differential inputs improve common-mode rejection and noise immunity; matching input topology is essential for direct substitution. |
| Interface | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Serial (SPI/QSPI/MICROWIRE/DSP) | Available digital interfaces determine compatibility with the host controller and PCB routing; a missing parallel port can break drop-in replacement. |
| Supply Voltage | 5 V analog, 5 V digital | 5 V analog, 5 V digital | Supply requirements must match the existing power rails to avoid redesign of the power section. |
| Package | 48-Lead LQFP | 48-Lead LQFP | Identical package and pinout enable physical drop-in compatibility on an existing PCB footprint. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | INL defines absolute accuracy deviation from an ideal transfer function; matching values indicate comparable linearity performance. |
| Power Consumption | ~100 mW typical | ~30 mW typical | Power dissipation affects thermal design and battery life; a significant difference may require re-evaluation of the thermal budget. |
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 | AD7678ASTZ | AD7671ASTZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Base Product Number | AD7678 | - |
| Number of Bits | 18 | 16 |
| Sampling Rate (Per Second) | 100k | - |
| 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 | - |
| 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 |
| Mounting Type | Surface Mount | - |
| Packaging | Tray | - |
| Sampling Rate(Per Second) | - | 1M |
| Number of A/D Converters | - | 1 |
| Features | - | True Bipolar |
Frequently asked questions
What are the key differences between the AD7671ASTZ and AD7678ASTZ?
The AD7671ASTZ is a 16-bit, 1 MSPS charge redistribution SAR ADC, while the AD7678ASTZ is an 18-bit, 100 kSPS SAR ADC. The AD7671ASTZ offers higher throughput, whereas the AD7678ASTZ provides higher resolution and is designed for lower-speed, high-accuracy applications.
Are the AD7671ASTZ and AD7678ASTZ pin-compatible?
Both devices are offered in a 48-lead LQFP package, but pin compatibility must be confirmed against the respective manufacturer datasheets, as pin functions and configurations may differ between the two parts.
What is the maximum sampling rate of each device?
The AD7671ASTZ supports a maximum throughput of 1 MSPS, while the AD7678ASTZ supports a maximum throughput of 100 kSPS.
What resolution does each ADC provide?
The AD7671ASTZ provides 16-bit resolution, and the AD7678ASTZ provides 18-bit resolution.
Do both parts support the same analog input configuration?
Both devices are SAR ADCs with differential analog input capability, but the exact input voltage ranges and configuration options should be verified in the respective datasheets before design reuse.
Can the AD7678ASTZ be used as a drop-in replacement for the AD7671ASTZ?
No. The two devices differ in resolution, throughput, and potentially pin function and timing, so a direct drop-in replacement is not supported without full validation against both datasheets and the target design.
What interface do these ADCs use for digital communication?
Both the AD7671ASTZ and AD7678ASTZ provide a parallel digital interface for output data, with timing and control details specified in their respective manufacturer datasheets.