Part A
AD7674ASTZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4562 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7674ASTZ is a viable functional replacement candidate for the AD7671ASTZ, sharing the same 48-lead LQFP footprint, 5 V analog supply, and pin-compatible serial/parallel interface architecture. Designers should validate the higher throughput requirement and confirm timing margins in the target system before committing to production.
Package and Pinout
High match
Resolution and Linearity
High match
Sample Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD7671ASTZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3582 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7674ASTZ | 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. |
| Maximum Sampling Rate | 1 MSPS | 800 kSPS | The throughput determines the highest signal bandwidth the converter can digitize; a slower part may not meet timing requirements of the original design. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | INL defines deviation from an ideal transfer function and is a key accuracy metric; matching values indicate comparable linearity performance. |
| SNR (Signal-to-Noise Ratio) | 90 dB typ | 101 dB typ | SNR reflects the noise floor relative to full scale; the higher-resolution device offers better noise performance, affecting achievable effective resolution. |
| Input Type | Differential | Differential | Differential inputs improve common-mode rejection and noise immunity; identical input topology supports similar front-end design. |
| Supply Voltage (Analog) | 5 V | 5 V | Analog supply compatibility ensures the part can drop into the same power rail without level shifting or regulator changes. |
| Interface | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Matching digital interfaces allow the same host controller and firmware to be reused, simplifying substitution. |
| Package | 48-Lead LQFP | 48-Lead LQFP | Identical package and pinout enable a direct board-level drop-in replacement without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching temperature ratings confirm both parts are suitable for the same environmental conditions and industrial applications. |
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 | AD7674ASTZ | AD7671ASTZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 18 | 16 |
| Sampling Rate(Per Second) | 800k | 1M |
| 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 | 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 key differences between the AD7671ASTZ and AD7674ASTZ?
The AD7671ASTZ is a 16-bit, 1 MSPS charge redistribution SAR ADC, while the AD7674ASTZ is an 18-bit, 800 kSPS SAR ADC. The AD7674 offers higher resolution (18-bit vs 16-bit) but a lower maximum throughput rate (800 kSPS vs 1 MSPS). Both are pin-compatible in the same 48-lead LQFP package and share the same analog input architecture and digital interface family.
Are the AD7671ASTZ and AD7674ASTZ pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package and are designed with a compatible pinout, allowing the AD7674ASTZ to be used as a higher-resolution upgrade path for the AD7671ASTZ in existing layouts, subject to verification of timing and performance requirements against the respective datasheets.
What is the resolution and throughput of each device?
The AD7671ASTZ provides 16-bit resolution with a maximum throughput of 1 MSPS. The AD7674ASTZ provides 18-bit resolution with a maximum throughput of 800 kSPS. The trade-off is higher dynamic range and SNR for the AD7674 versus a higher sampling rate for the AD7671.
Do both ADCs support the same analog input ranges?
Both devices feature a differential analog input with a programmable input range of 0 V to 5 V or ±2.5 V (with a 5 V reference), using the same successive-approximation architecture. Designers should confirm the exact input span and reference configuration against each device's datasheet for the target application.
What digital interfaces do the AD7671ASTZ and AD7674ASTZ provide?
Both parts provide a parallel interface and a serial interface (SPI/QSPI/MICROWIRE/DSP-compatible) for connection to host processors. The interface family is shared, which simplifies migration between the two devices, though timing parameters should be checked per datasheet.
Can the AD7674ASTZ directly replace the AD7671ASTZ in an existing design?
Because the two devices are pin-compatible and share the same package and interface family, the AD7674ASTZ can often serve as a drop-in higher-resolution replacement. However, the lower 800 kSPS throughput and any differences in timing, power, or SNR specifications must be validated against the system requirements before substitution.
How do the power consumption figures compare?
Both devices are low-power SAR ADCs operating from a 5 V analog supply with a separate digital supply. Actual power consumption depends on throughput and configuration; designers should refer to the operating current and power dissipation specifications in each device's datasheet rather than assuming identical values.
What package do the AD7671ASTZ and AD7674ASTZ use?
Both devices are supplied in a 48-lead LQFP package (the "ST" suffix in the part number denotes the LQFP package). The shared package and pinout support layout reuse between the two parts.