Part A
AD7680BRM
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3423 Stückzahl
- Package
- TSSOP-8
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7685ARMZRL7 and AD7680BRM are both 16-bit successive-approximation ADCs from Analog Devices in 8-lead MSOP packages, sharing a compatible serial interface and comparable supply requirements. However, they differ in throughput rate and reference architecture, so the AD7680BRM can serve as a functional substitute only after validating timing margins and reference configuration against the target design.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Reference Architecture
Validation required
Parts at a glance
Part B
AD7685ARMZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1265 Stückzahl
- Package
- MSOP-10
- 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 | AD7685ARMZRL7 | AD7680BRM | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Sampling Rate | 250 kSPS | 100 kSPS | The AD7685 supports a higher throughput, which matters for faster signal acquisition requirements. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both are single-channel devices, so channel count is not a differentiator. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Identical serial interface compatibility simplifies drop-in replacement in digital systems. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges allow use in the same power architecture. |
| Package | 10-lead MSOP | 8-lead MSOP | Different pin counts and footprints affect PCB layout and require redesign for substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings suit the same industrial environments. |
| Power Consumption | ~4 mW at 5 V, 250 kSPS | ~3.5 mW at 5 V, 100 kSPS | Lower power per conversion affects thermal budget and battery-powered designs. |
| Input Type | Pseudo-differential | Single-ended | Pseudo-differential input offers better common-mode rejection, which can affect accuracy in noisy 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 | AD7680BRM | AD7685ARMZRL7 |
|---|---|---|
| Supplier | Analog Devices Inc.,Rochester Electronics, LLC | - |
| Series | PulSAR® | PulSAR® |
| Part Status | Obsolete | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 250k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Pseudo-Differential |
| 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 | Supply | External |
| Voltage - Supply, Analog | 2.5V ~ 5.5V | 2.3V ~ 5.5V |
| Voltage - Supply, Digital | 2.5V ~ 5.5V | 2.3V ~ 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 AD7680BRM?
The AD7685ARMZRL7 is a 16-bit, 250 kSPS PulSAR analog-to-digital converter in a 10-lead MSOP package, while the AD7680BRM is a 16-bit, 100 kSPS successive-approximation ADC in an 8-lead MSOP package. The AD7685 offers a higher throughput rate and a different pin configuration compared to the AD7680.
Are the AD7685ARMZRL7 and AD7680BRM pin-compatible?
No. The AD7685ARMZRL7 is housed in a 10-lead MSOP package, whereas the AD7680BRM uses an 8-lead MSOP package. The differing pin counts and pin functions mean they are not drop-in replacements for each other.
What is the maximum sampling rate of each device?
The AD7685ARMZRL7 supports a maximum throughput of 250 kSPS. The AD7680BRM supports a maximum throughput of 100 kSPS. The AD7685 therefore offers 2.5 times the sampling rate of the AD7680.
Do both ADCs use the same serial interface?
Both devices provide a serial digital output compatible with SPI, QSPI, and MICROWIRE interfaces. However, the AD7685ARMZRL7 uses a 3-wire or 4-wire interface with a separate SDI configuration input, while the AD7680BRM provides a simpler 3-wire serial interface. Designers should verify timing and configuration requirements in each datasheet.
What are the analog input configurations of the AD7685ARMZRL7 and AD7680BRM?
The AD7685ARMZRL7 features a pseudo-differential analog input with a differential input range of ±VREF, configured via the SDI pin. The AD7680BRM provides a single-ended analog input with a 0 V to VREF input range. The input topologies are therefore not equivalent.
What supply voltages do these ADCs require?
Both the AD7685ARMZRL7 and the AD7680BRM operate from a single 2.7 V to 5.5 V analog supply (VDD) and a separate 1.8 V to 5.5 V digital supply (VIO) for the serial interface, allowing direct connection to low-voltage logic.
Can the AD7680BRM be used as a replacement for the AD7685ARMZRL7 in an existing design?
Not directly. The AD7680BRM has a lower maximum throughput (100 kSPS vs. 250 kSPS), a different package footprint (8-lead vs. 10-lead MSOP), a single-ended rather than pseudo-differential input, and a simpler serial interface. A replacement would require PCB redesign and validation against the system's timing and accuracy requirements.