Part A
AD7671ASTZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3582 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7671ASTZ and AD7674ASTZRL are both 16-bit successive-approximation ADCs from Analog Devices in the same 48-lead LQFP package, sharing a comparable analog input architecture and digital interface family. The AD7674ASTZRL offers a higher maximum sampling rate and a wider operating temperature range, making it a viable functional upgrade candidate for the AD7671ASTZ in most designs, provided the system timing budget and thermal environment are validated against the faster throughput and extended temperature specifications.
Resolution and ADC Architecture
High match
Package Type
High match
Maximum Sampling Rate
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD7674ASTZRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7785 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 | AD7674ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 18 bit | Higher resolution provides finer quantization and better dynamic range, which directly affects measurement accuracy and substitutability in precision applications. |
| Sampling Rate | 1 MSPS | 800 kSPS | Maximum throughput determines whether the ADC can keep up with the signal bandwidth and system timing requirements. |
| Number of Inputs / Channels | 1 single-ended | 1 differential | Input configuration affects signal conditioning, noise immunity, and whether the part can be dropped into an existing front-end design. |
| Input Type | Single-ended | Differential | Differential inputs reject common-mode noise and improve distortion performance, so the input topology must match the driving circuitry. |
| Architecture | SAR | SAR | Both use successive-approximation architecture, giving similar latency and no pipeline delay, which supports timing compatibility. |
| Supply Voltage (Analog) | 5 V | 5 V | Analog supply must match the system rail; identical 5 V operation simplifies power design and substitution. |
| 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 without redesign. |
| Package / Case | 48-LQFP | 48-LQFP | Identical package and footprint enable direct board-level replacement without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching temperature ratings ensure both parts meet the same environmental and reliability requirements. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | INL defines absolute accuracy; equivalent INL means comparable linearity performance in precision measurement systems. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7671ASTZ | AD7674ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 18 |
| Sampling Rate(Per Second) | 1M | 800k |
| 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 | External, Internal |
| 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 AD7674ASTZRL?
The AD7671ASTZ is a 16-bit, 1 MSPS charge redistribution SAR ADC, while the AD7674ASTZRL is an 18-bit, 800 kSPS PulSAR ADC. The AD7674 offers higher resolution (18-bit vs 16-bit) but a lower maximum throughput rate (800 kSPS vs 1 MSPS). Both are housed in a 48-lead LQFP package and operate from a 5 V analog supply with a separate digital supply.
Are the AD7671ASTZ and AD7674ASTZRL pin-compatible?
Yes. Both devices are specified in the same 48-lead LQFP (ST-48) package and share a common pinout, which allows the AD7674ASTZRL to be used as a higher-resolution upgrade path for the AD7671ASTZ in existing PCB layouts, subject to verification of timing and interface requirements.
What are the resolution and throughput specifications of each device?
The AD7671ASTZ provides 16-bit resolution with a maximum throughput of 1 MSPS. The AD7674ASTZRL provides 18-bit resolution with a maximum throughput of 800 kSPS. Both use a successive approximation register (SAR) architecture with internal conversion clock.
Do both ADCs support the same digital interfaces?
Both devices support parallel and serial digital interfaces. The AD7671ASTZ offers a parallel 16-bit interface and a serial interface, while the AD7674ASTZRL offers a parallel 18-bit interface and a serial interface. The serial interface on both supports SPI/QSPI/MICROWIRE/DSP-compatible timing.
What are the analog input voltage ranges for the AD7671ASTZ and AD7674ASTZRL?
Both devices offer a differential analog input range of ±VREF, where VREF is typically 2.5 V, providing a ±2.5 V differential input span. The AD7674ASTZRL also supports a 0 V to VREF unipolar range configuration, and both devices include an internal reference buffer.
What are the power supply requirements for these ADCs?
Both the AD7671ASTZ and AD7674ASTZRL operate from a 5 V analog supply (AVDD) and a separate digital supply (DVDD) that can range from 2.7 V to 5.25 V, allowing direct interfacing to lower-voltage logic. Both devices also include a power-down mode to reduce consumption between conversions.
What are the typical power consumption figures for the AD7671ASTZ and AD7674ASTZRL?
The AD7671ASTZ typically dissipates approximately 100 mW at 1 MSPS with a 5 V supply. The AD7674ASTZRL typically dissipates approximately 90 mW at 800 kSPS with a 5 V supply. Both devices offer reduced power modes for lower throughput operation.
What are the key AC performance specifications of these ADCs?
The AD7671ASTZ achieves a typical SINAD of 90 dB and THD of −100 dB at 1 MSPS. The AD7674ASTZRL achieves a typical SINAD of 100 dB and THD of −110 dB at 800 kSPS, reflecting its higher 18-bit resolution. Both are specified for operation over the −40 °C to +85 °C industrial temperature range.