Part A
AD7684BRMZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6195 PCS
- Package
- MSOP-8
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7685BRMZRL7 and AD7684BRMZRL7 share the same 16-bit SAR ADC architecture, MSOP-10 package, and serial interface family, making them functionally related candidates. However, they differ in input configuration and throughput, so the AD7684BRMZRL7 is not a direct drop-in for designs requiring differential input or higher sample rates. Verify input topology and timing requirements before substitution.
Package Type
High match
Resolution
High match
Input Configuration
Validation required
Sample Rate
Not compatible
Parts at a glance
Part B
AD7685BRMZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4839 PCS
- Package
- MSOP-10
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7684BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate (max) | 250 kSPS | 100 kSPS | The AD7685 supports a higher throughput, which matters if the application requires faster sampling than 100 kSPS. |
| Input Type | Pseudo-differential (single-ended) | True differential | Input topology affects signal conditioning, common-mode rejection, and whether the part can directly replace the other in a given front-end design. |
| Number of Input Channels | 1 | 1 | Both are single-channel devices, so channel count does not affect substitutability. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface simplifies drop-in replacement from a digital communication standpoint. |
| Supply Voltage (analog & digital) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges mean both can operate from the same rails, easing substitution. |
| Package | 10-lead MSOP (RM) | 10-lead MSOP (RM) | Same package and pin count allow physical board compatibility, though pin functions must be verified. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same environmental conditions. |
| Power Consumption (typical) | ~3.5 mW at 5 V, 250 kSPS | ~2.5 mW at 5 V, 100 kSPS | Lower power in the AD7684 may matter for battery-powered designs, while the AD7685 trades power for speed. |
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 | AD7684BRMZRL7 | AD7685BRMZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 250k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | 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 | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 2.3V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 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 AD7684BRMZRL7?
The AD7685BRMZRL7 is a 16-bit, 250 kSPS PulSAR analog-to-digital converter, while the AD7684BRMZRL7 is a 16-bit, 100 kSPS PulSAR ADC. Both are offered in a 10-lead MSOP (RM) package and are specified for the −40°C to +85°C industrial temperature range, but they differ in throughput rate and in their analog input/digital interface architecture.
Are the AD7685BRMZRL7 and AD7684BRMZRL7 pin-compatible?
Both devices are supplied in the same 10-lead MSOP (RM) package, but pin compatibility must be confirmed against the respective manufacturer pinouts before substitution, because the analog input configuration and digital interface signals differ between the two converters.
What is the maximum sampling rate of each device?
The AD7685BRMZRL7 supports a maximum throughput of 250 kSPS. The AD7684BRMZRL7 supports a maximum throughput of 100 kSPS. The higher throughput of the AD7685 makes it preferable for faster acquisition requirements, provided the rest of the signal chain supports it.
Do both converters provide 16-bit resolution?
Yes. Both the AD7685BRMZRL7 and the AD7684BRMZRL7 are 16-bit successive-approximation (SAR) PulSAR ADCs, so both offer 16-bit no-missing-code performance as specified in their respective datasheets.
What analog input configuration does each ADC use?
The AD7685BRMZRL7 provides a pseudo-differential analog input, while the AD7684BRMZRL7 provides a true differential analog input. This difference affects how the input signal must be driven and how common-mode noise is rejected in the target design.
What digital interface do these ADCs support?
The AD7685BRMZRL7 uses a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interface standards. The AD7684BRMZRL7 also provides a serial digital output, but its interface timing and readback behavior differ and must be verified against its datasheet before reuse of existing firmware or FPGA logic.
Can the AD7684BRMZRL7 directly replace the AD7685BRMZRL7 in an existing design?
Not without validation. Although both are 16-bit, 10-lead MSOP PulSAR ADCs, the AD7684BRMZRL7 has a lower maximum throughput (100 kSPS versus 250 kSPS) and a different analog input configuration, so timing, input drive circuitry, and firmware must be re-verified against the manufacturer datasheet before substitution.
What are the operating temperature ranges of these devices?
Both the AD7685BRMZRL7 and the AD7684BRMZRL7 are specified over the industrial temperature range of −40°C to +85°C, making them suitable for industrial signal-acquisition applications within that range.
Which device should be selected for a higher-throughput application?
The AD7685BRMZRL7 should be selected when higher throughput is required, since it supports up to 250 kSPS versus 100 kSPS for the AD7684BRMZRL7. The AD7684BRMZRL7 may be preferred where its true differential input and lower rate better match the application's signal chain.