Part A
AD7671ASTZ
ADI公司
- Lifecycle
- Active
- Stock
- 3582 件
- Package
- LQFP-48
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The AD7671ASTZ and AD7677ASTZRL are both 16-bit successive-approximation ADCs from Analog Devices in the same 48-lead LQFP package, sharing a comparable digital interface and reference architecture, so the AD7677ASTZRL can serve as a functional replacement candidate for the AD7671ASTZ provided the higher throughput and reduced input range of the AD7677 are validated against the target design. Review the critical differences below before committing to a drop-in substitution.
Resolution and Linearity
High match
Sample Rate
Validation required
Analog Input Range
Validation required
Package and Pinout
High match
Parts at a glance
Part B
AD7677ASTZRL
ADI公司
- Lifecycle
- Active
- Stock
- 4959 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 | AD7677ASTZRL | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Sampling Rate (max) | 1 MSPS | 1 MSPS | Maximum throughput determines whether the part meets system timing requirements. |
| Architecture | SAR | SAR | Successive-approximation architecture affects latency, power, and interface behavior. |
| Input Type | Differential | Differential | Differential inputs improve noise immunity and match signal-chain topology. |
| Supply Voltage (Analog) | 5 V | 5 V | Analog supply must match the board's power rail for direct replacement. |
| Interface | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Interface compatibility determines whether the host processor can communicate without redesign. |
| Package / Case | 48-LQFP | 48-LQFP | Footprint and package must match for drop-in PCB substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application's environmental conditions. |
| INL (max) | ±2.5 LSB | ±2.5 LSB | Integral nonlinearity defines accuracy and whether precision requirements are met. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7671ASTZ | AD7677ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 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 | 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 AD7677ASTZRL?
The AD7671ASTZ is a 16-bit, 1 MSPS successive-approximation ADC, while the AD7677ASTZRL is a 16-bit, 1 MSPS charge-redistribution SAR ADC with a different architecture and feature set. The AD7677ASTZRL is supplied in tape-and-reel packaging (RL suffix), whereas the AD7671ASTZ is supplied in standard tray packaging. Both are 16-bit, 1 MSPS devices in 48-lead LQFP packages, but they differ in analog input range, reference requirements, and power consumption characteristics per their respective datasheets.
Are the AD7671ASTZ and AD7677ASTZRL pin-compatible?
Both devices are offered in 48-lead LQFP (ST-48) packages, but pin compatibility must be verified against the pin configurations in the respective Analog Devices datasheets. The two parts have different internal architectures and analog input structures, so a direct drop-in replacement should not be assumed without confirming pin function assignments and external component requirements.
What is the resolution and throughput of each device?
Both the AD7671ASTZ and AD7677ASTZRL are 16-bit successive-approximation ADCs with a maximum throughput of 1 MSPS. The AD7671 is specified as a 16-bit, 1 MSPS ADC, and the AD7677 is likewise a 16-bit, 1 MSPS charge-redistribution SAR ADC, per Analog Devices datasheets.
What analog input range does each ADC support?
The AD7671ASTZ supports a selectable analog input range of 0 V to 2.5 V, 0 V to 5 V, ±2.5 V, and ±5 V, configured via the input range pins. The AD7677ASTZRL features a differential analog input with a specified input range defined in its datasheet. Designers should consult the respective datasheets to confirm the exact input span and configuration for their application.
How do the power consumption figures compare?
Both devices are specified with power consumption figures in their Analog Devices datasheets. The AD7671ASTZ operates from a 5 V analog supply and a 5 V digital supply with a specified power dissipation at 1 MSPS. The AD7677ASTZRL also has specified power consumption at 1 MSPS in its datasheet. Exact values should be taken from the current manufacturer datasheets, as they depend on supply configuration and operating mode.
What interface do these ADCs provide for connecting to a host processor?
Both the AD7671ASTZ and AD7677ASTZRL provide a parallel digital interface for connection to a host processor or DSP. The AD7671 offers a flexible parallel interface with word/byte modes, and the AD7677 provides a parallel interface as specified in its datasheet. Designers should verify timing and bus-width requirements against the host system.
What is the significance of the RL suffix on the AD7677ASTZRL?
The "RL" suffix on the AD7677ASTZRL indicates tape-and-reel packaging, which is intended for automated pick-and-place assembly in high-volume production. The AD7671ASTZ, without an RL suffix, is supplied in standard tray packaging. Both parts share the same 48-lead LQFP package body, but the packaging format differs for manufacturing handling.
Can the AD7671ASTZ and AD7677ASTZRL be used interchangeably in an existing design?
They should not be treated as interchangeable without a full design review. Although both are 16-bit, 1 MSPS SAR ADCs in 48-lead LQFP packages, they differ in analog input configuration, reference architecture, and interface timing. A substitution requires verifying pin functions, input range, reference requirements, and digital timing against the target design and the manufacturer datasheets.