Part A
AD7677ASTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1648 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7677ASTZ and AD7675AST 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. However, they differ in sampling rate and power consumption, so the AD7677ASTZ can serve as a functional substitute for the AD7675AST only where the higher throughput and associated power budget are acceptable; designers should validate timing, power, and thermal margins in the target application before committing to the swap.
Resolution
High match
Sampling Rate
Validation required
Power Consumption
Validation required
Package Type
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7677ASTZ | AD7675AST | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Sampling Rate | 1 MSPS | 100 kSPS | The AD7677 supports a much higher throughput, which is critical for high-speed acquisition applications. |
| Architecture | SAR | SAR | Both use successive-approximation architecture, giving similar latency and no pipeline delay. |
| Input Type | Differential | Differential | Differential inputs on both parts provide good common-mode rejection and noise immunity. |
| Supply Voltage | 5 V | 5 V | Identical analog supply requirements simplify power-supply design when substituting. |
| Interface | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel / Serial (SPI/QSPI/MICROWIRE/DSP) | Matching digital interfaces allow drop-in compatibility with existing host controllers. |
| Package | 48-LQFP | 48-LQFP | Same package footprint enables direct board-level replacement without layout changes. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±3 LSB max | Slightly better linearity on the AD7677 improves accuracy in precision measurement applications. |
| Power Consumption | ~120 mW | ~25 mW | The AD7675 draws significantly less power, which matters for portable or thermally constrained designs. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7677ASTZ | AD7675AST |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 100k |
| 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 | - |
Frequently asked questions
What are the key differences between the AD7677ASTZ and the AD7675AST?
The AD7677ASTZ is a 16-bit, 1 MSPS differential SAR ADC, while the AD7675AST is a 16-bit, 100 kSPS differential SAR ADC. The primary differences are sampling rate (1 MSPS vs 100 kSPS) and power consumption, with the AD7677 typically consuming more power due to its higher throughput. Both are offered in 48-lead LQFP packages and share similar pin functions, but they are not drop-in replacements without validating timing, power, and interface requirements.
Are the AD7677ASTZ and AD7675AST pin-compatible?
Both devices are supplied in a 48-lead LQFP (ST-48) package with similar pinouts, but pin compatibility must be confirmed against the respective manufacturer datasheets. Differences in power supply decoupling, reference connections, and digital interface timing may require layout or firmware adjustments, so a direct drop-in substitution should not be assumed without verification.
What is the maximum sampling rate of each device?
The AD7677ASTZ supports a maximum throughput of 1 MSPS, while the AD7675AST supports a maximum throughput of 100 kSPS. The higher sampling rate of the AD7677 makes it suitable for faster signal acquisition applications, whereas the AD7675 is intended for lower-speed, lower-power designs.
Do both ADCs use the same digital interface?
Both the AD7677ASTZ and AD7675AST provide a parallel digital interface for output data and support similar control signals. However, timing parameters such as conversion time, acquisition time, and read cycle timing differ because of the different throughput rates, so the host interface timing must be revalidated when substituting one device for the other.
How do the power consumption figures compare?
The AD7677ASTZ, operating at up to 1 MSPS, typically consumes more power than the AD7675AST, which operates at up to 100 kSPS. Exact power figures depend on supply voltage and operating mode, and should be taken from the respective manufacturer datasheets rather than assumed.
Can the AD7675AST be used as a replacement for the AD7677ASTZ in an existing design?
Substitution is possible only if the system can tolerate the reduced 100 kSPS throughput of the AD7675AST and if the interface timing, power budget, and reference requirements are revalidated. Because the two devices differ in maximum sampling rate and associated timing, a direct replacement without design review is not recommended.
What resolution and input configuration do these ADCs provide?
Both the AD7677ASTZ and AD7675AST are 16-bit successive-approximation register (SAR) analog-to-digital converters with differential analog inputs. They are intended for precision measurement applications requiring 16-bit resolution, with the choice between them driven primarily by required throughput and power budget.