Part A
AD7671ASTZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3582 個数
- Package
- LQFP-48
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7671ASTZ and AD7676ASTZRL are both 16-bit successive-approximation ADCs from Analog Devices in the same 48-lead LQFP package, sharing a compatible digital interface and reference architecture, so the AD7676ASTZRL can serve as a functional replacement candidate for the AD7671ASTZ provided the system timing budget accommodates the lower throughput and the analog input range is re-matched. Designers should validate the reduced sample rate and the different full-scale input span against their application requirements before committing to the substitution.
Resolution and Linearity
Validation required
Sampling Rate
Not compatible
Analog Input Range
Validation required
Package and Pinout
High match
Parts at a glance
Part B
AD7676ASTZRL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5733 個数
- Package
- LQFP-48
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7676ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Sampling Rate | 1 MSPS | 500 kSPS | The AD7671 supports twice the throughput, which affects achievable signal bandwidth and system timing. |
| Architecture | SAR | SAR | Both use SAR conversion, giving similar latency and no pipeline delay characteristics. |
| Input Type | Differential | Differential | Differential inputs on both parts support similar signal conditioning and noise rejection schemes. |
| Supply Voltage (Analog) | 5 V | 5 V | Matching analog supply simplifies power rail reuse when swapping parts. |
| Interface | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Identical digital interface options allow drop-in compatibility with existing host controllers. |
| Package | 48-Lead LQFP | 48-Lead LQFP | Same package and pin count support PCB footprint compatibility. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±1.5 LSB max | The AD7676 offers better linearity, which can matter for precision measurement accuracy. |
| SNR | 90 dB typ | 92 dB typ | Higher SNR on the AD7676 provides better dynamic range for low-level signal acquisition. |
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 | AD7676ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 500k |
| 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 AD7676ASTZRL?
The AD7671ASTZ is a 16-bit, 1 MSPS charge redistribution SAR ADC, while the AD7676ASTZRL is a 16-bit, 500 kSPS charge redistribution SAR ADC. Both are pin-compatible in a 48-lead LQFP package, but the AD7671 offers twice the throughput of the AD7676. The AD7676ASTZRL is supplied in tape-and-reel packaging, whereas the AD7671ASTZ is supplied in tray form.
Are the AD7671ASTZ and AD7676ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package with identical pin functions, allowing a common PCB footprint. Designers should still verify the specific configuration pins and supply decoupling against each datasheet before substituting one for the other.
What is the maximum sampling rate of each device?
The AD7671ASTZ supports a maximum throughput of 1 MSPS. The AD7676ASTZRL supports a maximum throughput of 500 kSPS. The throughput difference is the primary selection criterion when choosing between the two parts.
Do both ADCs offer the same resolution and interface options?
Yes. Both are 16-bit SAR ADCs featuring a parallel interface and a serial interface, with support for both master and slave serial modes. Both also provide a read-only (RDC) mode and a daisy-chain configuration for serial operation.
What are the analog input voltage ranges for these ADCs?
Both the AD7671ASTZ and AD7676ASTZRL accept a differential analog input range of ±VREF, where VREF is nominally 2.5 V, giving a full-scale input span of ±2.5 V. The input structure is a switched-capacitor charge redistribution architecture.
What are the power supply requirements and typical power consumption?
Both devices operate from a 5 V analog supply (AVDD) and a 5 V digital supply (DVDD), with a separate VIO supply for the digital interface. The AD7671ASTZ typically dissipates about 100 mW at 1 MSPS, while the AD7676ASTZRL typically dissipates about 60 mW at 500 kSPS. Both offer power-down modes to reduce consumption between conversions.
Can the AD7676ASTZRL be used as a drop-in replacement for the AD7671ASTZ in an existing design?
Because the two parts share the same package and pinout, the AD7676ASTZRL can be placed on a board designed for the AD7671ASTZ. However, the lower 500 kSPS throughput must be acceptable for the application, and timing, power, and interface configuration should be revalidated against the AD7676 datasheet before production use.
What are the operating temperature ranges and packaging options?
Both the AD7671ASTZ and AD7676ASTZRL are specified over the industrial temperature range of −40°C to +85°C and are supplied in a 48-lead LQFP package. The AD7671ASTZ is provided in tray packaging, while the AD7676ASTZRL suffix indicates tape-and-reel packaging for automated assembly.