Part A
AD7671ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3582 Stückzahl
- Package
- LQFP-48
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7671ASTZ and AD7677ASTRL are both 16-bit successive-approximation ADCs offering comparable resolution and similar analog input architecture, making the AD7677ASTRL a viable functional candidate for the AD7671ASTZ in many designs. However, the two parts differ in throughput rate, package footprint, and operating temperature range, so the replacement should be validated against the target application's timing, board layout, and environmental requirements before adoption.
Resolution
High match
Sample Rate
Validation required
Package Type
Not compatible
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD7677ASTRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5280 Stückzahl
- Package
- LQFP-48
- Series
- Datenerfassung mit 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 | AD7671ASTZ | AD7677ASTRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both are 16-bit SAR ADCs, so nominal resolution is equivalent for substitutability. |
| Sampling Rate | 1 MSPS | 1 MSPS | Throughput determines maximum signal bandwidth and system timing; identical rates ease drop-in replacement. |
| Input Type | Differential | Differential | Differential inputs improve noise immunity and dynamic range; matching input topology supports similar front-end design. |
| Interface | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Digital interface compatibility determines whether the part can connect to the same host processor without redesign. |
| Supply Voltage (Analog) | 5 V | 5 V | Analog supply affects input range and signal conditioning; identical supplies simplify power rail reuse. |
| Supply Voltage (Digital) | 5 V | 5 V | Digital I/O levels must match the host logic; matching DVDD avoids level shifting. |
| Package | 48-Lead LQFP | 48-Lead LQFP | Package and pinout compatibility is essential for physical board-level substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range determines suitability for industrial vs. commercial environments. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | INL defines DC accuracy; matching specifications ensures equivalent measurement precision. |
| Power Consumption | ~100 mW typical | ~100 mW typical | Power budget and thermal design depend on consumption; similar values support equivalent thermal performance. |
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 | AD7671ASTZ | AD7677ASTRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Data Interface | SPI, Parallel, DSP | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
| Features | True Bipolar | - |
Frequently asked questions
What are the key differences between the AD7671ASTZ and AD7677ASTRL?
The AD7671ASTZ is a 16-bit, 1 MSPS successive-approximation ADC with a parallel interface, while the AD7677ASTRL is a 16-bit, 1 MSPS charge-redistribution SAR ADC featuring a serial SPI/QSPI/MICROWIRE/DSP-compatible interface. Both are 16-bit, 1 MSPS devices, but they differ in output interface, package, and input architecture.
Are the AD7671ASTZ and AD7677ASTRL pin-compatible?
No. The AD7671ASTZ is offered in a 48-lead LQFP package, and the AD7677ASTRL is offered in a 48-lead LQFP package as well, but their pin functions and interfaces differ (parallel versus serial), so they are not direct drop-in replacements. PCB layout and interface logic must be redesigned accordingly.
What is the resolution and throughput of each device?
Both the AD7671ASTZ and AD7677ASTRL provide 16-bit resolution with a maximum throughput of 1 MSPS, making them suitable for high-speed precision data acquisition applications.
What digital interfaces do these ADCs provide?
The AD7671ASTZ provides a parallel digital output interface, while the AD7677ASTRL provides a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP systems. The choice depends on the host processor and board architecture.
Do both parts support the same analog input range?
Both devices support a differential analog input range of ±VREF with a nominal 2.5 V reference, but the input architecture differs: the AD7671ASTZ uses a successive-approximation architecture, and the AD7677ASTRL uses a charge-redistribution SAR architecture. Designers should verify input drive and settling requirements against the respective datasheets.
What are the typical power supply requirements for these ADCs?
Both the AD7671ASTZ and AD7677ASTRL operate from a 5 V analog supply (AVDD) and a 5 V digital supply (DVDD), with a separate VREF input. Actual current consumption and power dissipation should be confirmed from the manufacturer datasheets for the specific operating conditions.
Which part should be selected for a serial-interface design?
The AD7677ASTRL is the appropriate choice for serial-interface designs because it provides an SPI/QSPI/MICROWIRE/DSP-compatible serial output. The AD7671ASTZ is intended for parallel-interface host systems.
Are these parts suitable for direct substitution in an existing design?
No. Because the AD7671ASTZ and AD7677ASTRL differ in digital interface, pin functions, and input architecture, direct substitution requires validation of timing, interface logic, PCB layout, and analog front-end drive against the manufacturer datasheets for the target design.