Part A
AD7685BRMZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4839 PCS
- Package
- MSOP-10
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7685BRMZRL7 is a functional replacement candidate for the AD7680BRMZ, sharing the same 16-bit SAR architecture, 8-pin MSOP package, and serial interface, but it requires validation of the higher throughput rate and the wider reference and supply voltage ranges before substitution in a given design.
Resolution and Architecture
High match
Package and Pinout
High match
Sampling Rate
Validation required
Supply and Reference Range
Validation required
Parts at a glance
Part B
AD7680BRMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5939 PCS
- Package
- MSOP-8
- Series
- Data Acquisition - 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 | AD7680BRMZ | AD7685BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Sampling Rate (max) | 100 kSPS | 250 kSPS | The AD7685 supports a higher throughput, which matters if the application needs faster sampling than 100 kSPS. |
| Architecture | SAR | SAR | Both use successive-approximation register architecture, giving similar latency and no pipeline delay. |
| Input Type | Single-ended | Pseudo-differential | Input configuration affects how the signal source must be connected and common-mode handling; pseudo-differential can reject some ground noise. |
| Supply Voltage (analog) | 2.5 V to 5.5 V | 2.7 V to 5.5 V | Slightly different minimum supply voltage affects compatibility with low-voltage rails. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Both use a serial interface compatible with common digital hosts, simplifying drop-in replacement at the digital side. |
| Package | 10-Lead MSOP | 10-Lead MSOP | Identical package and pin count allow the same PCB footprint, which is critical for physical substitutability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges ensure both parts suit the same environmental conditions. |
| Power Consumption (typical) | 3.5 mW at 5 V, 100 kSPS | 4 mW at 5 V, 250 kSPS | Power budget differences matter in portable or thermally constrained designs, though the AD7685 delivers higher speed for slightly more power. |
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 | AD7685BRMZRL7 | AD7680BRMZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| 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 AD7680BRMZ and AD7685BRMZRL7?
The AD7680BRMZ is a 16-bit, 100 kSPS PulSAR analog-to-digital converter, while the AD7685BRMZRL7 is a 16-bit, 250 kSPS PulSAR ADC. The AD7685 offers a higher maximum throughput rate (250 kSPS vs 100 kSPS) and is supplied in a 10-lead MSOP package in tape-and-reel form (RL7 suffix), whereas the AD7680BRMZ is supplied in a 10-lead MSOP tube form. Both are single-channel, successive-approximation ADCs with a pseudo-differential input and SPI-compatible serial interface.
Are the AD7680BRMZ and AD7685BRMZRL7 pin-compatible?
Yes. Both devices are offered in the same 10-lead MSOP (RM) package with the same pinout, allowing them to share a common PCB footprint. However, designers should verify the supply, reference, and interface pin functions against the respective datasheets before substituting one for the other in an existing design.
What is the maximum sampling rate of each device?
The AD7680BRMZ supports a maximum throughput of 100 kSPS. The AD7685BRMZRL7 supports a maximum throughput of 250 kSPS. The higher rate of the AD7685 makes it suitable for faster signal acquisition applications, provided the host interface and reference can support the increased data rate.
Do both ADCs use the same serial interface?
Yes. Both the AD7680 and AD7685 use an SPI-compatible serial interface for configuration and data readback, with a similar timing structure. This allows either device to interface with common microcontrollers and DSPs using standard SPI or QSPI ports, though timing parameters should be checked against each datasheet for the chosen throughput.
What is the difference between the BRMZ and BRMZRL7 suffixes?
The "BRMZ" suffix indicates a 10-lead MSOP package in tube form. The "BRMZRL7" suffix indicates the same 10-lead MSOP package supplied in tape-and-reel packaging (RL7 denotes the reel quantity/format). The electrical grade and package type are otherwise the same; the difference is packaging and order quantity, which matters for automated assembly lines.
Can the AD7685BRMZRL7 directly replace the AD7680BRMZ in an existing design?
Because both are 16-bit, single-channel PulSAR ADCs in the same 10-lead MSOP package with a compatible serial interface, the AD7685BRMZRL7 can often serve as a drop-in replacement. However, the higher 250 kSPS throughput of the AD7685 requires the host interface, reference, and power supply to support the faster conversion timing, so the design should be validated against the AD7685 datasheet before substitution.
What is the resolution and architecture of these converters?
Both the AD7680BRMZ and AD7685BRMZRL7 are 16-bit, successive-approximation register (SAR) analog-to-digital converters with a pseudo-differential input. They provide no missing codes at 16 bits and are intended for precision measurement, industrial control, and data acquisition applications.