Part A
AD7685ARMZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1265 PCS
- Package
- MSOP-10
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7685ARMZRL7 and AD7680ARM are both 16-bit successive-approximation ADCs from Analog Devices in the same MSOP-10 package and share a compatible serial interface, making the AD7685ARMZRL7 a viable functional replacement candidate for the AD7680ARM. However, the two devices differ in throughput rate and reference architecture, so the replacement must be validated against the target system's timing and reference requirements before adoption.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Reference Architecture
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7685ARMZRL7 | AD7680ARM | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is equivalent and does not differentiate substitutability. |
| Sampling Rate (max) | 250 kSPS | 100 kSPS | The AD7685 supports a higher throughput, which matters for faster signal acquisition and higher-bandwidth applications. |
| Architecture | SAR | SAR | Both use SAR architecture, giving similar latency and no pipeline delay characteristics. |
| Input Type | Pseudo-differential | Single-ended | Input configuration affects how the ADC connects to the signal source and its ability to reject common-mode noise. |
| Number of Inputs | 1 | 1 | Both are single-channel devices, so channel count is not a differentiator. |
| Supply Voltage (analog) | 2.7 V to 5.5 V | 2.5 V to 5.5 V | Slightly different minimum supply voltage affects compatibility with low-voltage rails in the system. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Both use a serial interface compatible with common digital hosts, so digital integration is similar. |
| Package | 10-lead MSOP | 8-lead MSOP | Different pin counts and footprints affect PCB layout and drop-in replacement feasibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial operating environments. |
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 | AD7685ARMZRL7 | AD7680ARM |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 100k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential | Single Ended |
| Data Interface | SPI, DSP | SPI, 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 | Supply |
| Voltage - Supply, Analog | 2.3V ~ 5.5V | 2.5V ~ 5.5V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7685ARMZRL7 and the AD7680ARM?
The AD7685ARMZRL7 is a 16-bit, 250 kSPS PulSAR analog-to-digital converter with a pseudo-differential input, while the AD7680ARM is a 16-bit, 100 kSPS successive-approximation ADC with a single-ended input. The AD7685 offers a higher throughput rate and a different input configuration compared to the AD7680.
Are the AD7685ARMZRL7 and AD7680ARM pin-compatible?
Both devices are offered in a 10-lead MSOP (RM) package, but pin compatibility must be verified against the respective manufacturer datasheets, as pin functions and configurations may differ between the two converters.
What is the maximum sampling rate of each device?
The AD7685ARMZRL7 supports a maximum throughput of 250 kSPS, whereas the AD7680ARM supports a maximum throughput of 100 kSPS.
What input configuration does each ADC support?
The AD7685ARMZRL7 features a pseudo-differential input structure, while the AD7680ARM provides a single-ended input configuration.
What is the resolution of the AD7685ARMZRL7 and AD7680ARM?
Both the AD7685ARMZRL7 and the AD7680ARM are 16-bit analog-to-digital converters.
What supply voltage do these ADCs require?
Both devices operate from a single 2.7 V to 5.5 V supply, with a separate interface supply (VIO) for the digital I/O, per the manufacturer datasheets.
What serial interface do the AD7685ARMZRL7 and AD7680ARM use?
Both converters provide a serial digital output compatible with SPI, QSPI, MICROWIRE, and DSP interface standards, allowing direct connection to common digital hosts.
Can the AD7680ARM be used as a drop-in replacement for the AD7685ARMZRL7?
Not without validation. Although both are 16-bit ADCs in a 10-lead MSOP package, differences in throughput (100 kSPS vs 250 kSPS) and input configuration (single-ended vs pseudo-differential) mean the substitution must be verified against the target design requirements and manufacturer documentation.