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 AD7685BRMZRL7 and AD7680BRM are both 16-bit successive-approximation ADCs from Analog Devices in MSOP-10 packages, sharing a compatible serial interface and similar supply requirements, making them a viable functional replacement candidate. However, the AD7685BRMZRL7 offers a significantly higher throughput rate of 250 kSPS versus 100 kSPS for the AD7680BRM, so the replacement is only appropriate where the system timing budget accommodates the lower conversion rate of the AD7680BRM. Designers should validate the timing margin and reference configuration before substituting.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Supply Voltage
High match
Parts at a glance
Part B
AD7685BRMZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4839 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 | AD7685BRMZRL7 | AD7680BRM | 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 successive-approximation register architecture, giving similar latency and no pipeline delay characteristics. |
| Input Type | Pseudo-differential, single-ended | Single-ended | The AD7685 supports pseudo-differential inputs, which can improve rejection of common-mode noise compared to the purely single-ended AD7680. |
| Supply Voltage | 2.7 V to 5.5 V | 2.5 V to 5.5 V | The AD7680 can operate at a slightly lower minimum supply, which may matter in low-voltage systems. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Both offer the same serial interface options, so digital host compatibility is equivalent. |
| Package | 10-lead MSOP | 8-lead MSOP | Different pin counts and footprints mean the parts are not drop-in replacements on the same PCB layout. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial temperature environments. |
| Power Consumption (typical) | 3.5 mW at 5 V, 250 kSPS | 3.5 mW at 5 V, 100 kSPS | Similar power draw, but the AD7685 delivers higher throughput for comparable power, affecting efficiency in portable designs. |
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 | AD7685BRMZRL7 |
|---|---|---|
| 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 AD7685BRMZRL7 and the AD7680BRM?
The AD7685BRMZRL7 is a 16-bit, 250 kSPS PulSAR analog-to-digital converter with a pseudo-differential input, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and it operates from a 2.7 V to 5.5 V supply in a 10-lead MSOP package. The AD7680BRM is a 16-bit, 100 kSPS successive-approximation ADC with a single-ended input, SPI-compatible serial interface, operating from a 2.7 V to 5.5 V supply in an 8-lead MSOP package. The AD7685 offers a higher throughput rate (250 kSPS vs 100 kSPS) and a pseudo-differential input, while the AD7680 provides a single-ended input in a smaller 8-lead package.
Are the AD7685BRMZRL7 and AD7680BRM pin-compatible?
No. The AD7685BRMZRL7 is supplied in a 10-lead MSOP package, while the AD7680BRM is supplied in an 8-lead MSOP package. The different pin counts and pin functions mean they are not drop-in pin-compatible replacements, and the PCB land pattern must be redesigned if substituting one for the other.
Do the AD7685BRMZRL7 and AD7680BRM have the same resolution and sampling rate?
Both devices provide 16-bit resolution. However, their maximum throughput rates differ: the AD7685BRMZRL7 supports up to 250 kSPS, while the AD7680BRM supports up to 100 kSPS. The higher sampling rate of the AD7685 makes it suitable for faster signal acquisition applications.
What input configuration does each ADC support?
The AD7685BRMZRL7 features a pseudo-differential input configuration, allowing it to measure the difference between an input signal and a reference-level input. The AD7680BRM features a single-ended input configuration, where the input signal is measured relative to ground. This difference affects how each ADC interfaces with sensors and signal conditioning circuitry.
What serial interface do the AD7685BRMZRL7 and AD7680BRM use?
Both devices use a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. The AD7685BRMZRL7 provides this serial interface for communication with microcontrollers and digital signal processors, and the AD7680BRM provides an SPI-compatible serial interface. Both allow direct connection to common digital hosts without additional glue logic.
What are the supply voltage requirements for the AD7685BRMZRL7 and AD7680BRM?
Both the AD7685BRMZRL7 and the AD7680BRM operate from a single supply voltage in the range of 2.7 V to 5.5 V. This wide supply range allows both ADCs to interface with 3 V and 5 V digital systems and to be used in portable and industrial applications.
Can the AD7680BRM be used as a direct replacement for the AD7685BRMZRL7 in an existing design?
No, a direct replacement is not possible without design changes. The AD7680BRM is an 8-lead device with a single-ended input and a 100 kSPS maximum throughput, whereas the AD7685BRMZRL7 is a 10-lead device with a pseudo-differential input and a 250 kSPS maximum throughput. The package, pinout, input configuration, and sampling rate differences require PCB and firmware modifications, and the replacement must be validated against the manufacturer datasheets for the target design.