Part A
AD7684BRMZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6195 Stückzahl
- Package
- MSOP-8
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7686CRMZ and AD7684BRMZRL7 are both 16-bit successive-approximation ADCs from Analog Devices in 10-lead MSOP packages, sharing a compatible serial interface and similar supply architecture, so the AD7684BRMZRL7 can serve as a functional replacement candidate for the AD7686CRMZ. However, the two parts differ in channel count, throughput rate, and analog input configuration, so the substitution requires validation against the target application's sampling rate, input signal conditioning, and channel requirements before adoption.
Channel Count
Validation required
Sampling Rate
Validation required
Resolution
High match
Package Type
High match
Parts at a glance
Part B
AD7686CRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3822 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 | AD7686CRMZ | AD7684BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is equivalent and not a differentiator for substitutability. |
| Sampling Rate (max) | 500 kSPS | 100 kSPS | The AD7686 supports a much higher throughput, so it can replace the AD7684 in faster applications but not vice versa. |
| Number of Input Channels | 1 (single-ended) | 1 (differential) | Input configuration differs: single-ended versus fully differential, affecting signal chain design and noise immunity. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Both use a serial interface, so digital host compatibility is similar. |
| Supply Voltage (Analog & Digital) | 5 V (2.5 V to 5.5 V range) | 5 V (2.7 V to 5.5 V range) | Slightly different minimum supply voltages affect low-voltage operation and power budgeting. |
| Package | 10-lead MSOP | 8-lead MSOP | Different pin counts and footprints mean the parts are not drop-in PCB replacements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean environmental suitability is the same. |
| Power Consumption (typical) | ~15 mW at 5 V, 500 kSPS | ~6 mW at 5 V, 100 kSPS | Power draw differs significantly, which matters for portable and thermally constrained designs. |
| Reference Type | External reference | External reference | Both require an external reference, so reference circuitry can be reused across 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 | AD7684BRMZRL7 | AD7686CRMZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 500k |
| 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 | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7686CRMZ and AD7684BRMZRL7?
The AD7686CRMZ is a 16-bit, 500 kSPS PulSAR analog-to-digital converter with a pseudo-differential input, supplied in a 10-lead MSOP package. The AD7684BRMZRL7 is a 16-bit, 100 kSPS PulSAR ADC with a true differential input, supplied in a 10-lead MSOP package and delivered in tape-and-reel format. The primary differences are throughput (500 kSPS vs 100 kSPS) and input configuration (pseudo-differential vs true differential).
Are the AD7686CRMZ and AD7684BRMZRL7 pin-compatible?
Both devices are offered in a 10-lead MSOP package, but pin compatibility must be confirmed against the respective manufacturer pinout diagrams, since the analog input configuration differs (pseudo-differential on the AD7686 versus true differential on the AD7684). Designers should verify each pin function before considering a layout-level substitution.
What is the maximum sampling rate of each device?
The AD7686CRMZ supports a maximum throughput of 500 kSPS. The AD7684BRMZRL7 supports a maximum throughput of 100 kSPS. The higher throughput of the AD7686 makes it suitable for faster acquisition applications, while the AD7684 targets lower-speed, precision differential measurement.
What is the resolution and architecture of these ADCs?
Both the AD7686CRMZ and AD7684BRMZRL7 are 16-bit successive-approximation register (SAR) analog-to-digital converters based on the Analog Devices PulSAR architecture, providing no-latency conversion suitable for precision measurement and industrial signal-chain applications.
How do the analog input configurations differ?
The AD7686CRMZ provides a pseudo-differential input, where the negative input is typically tied to a reference or ground potential. The AD7684BRMZRL7 provides a true differential input, allowing the converter to measure the difference between two actively driven inputs, which improves common-mode rejection for differential sensors.
What supply and interface requirements apply to these converters?
Both devices operate from a single analog supply and include a serial digital interface for connection to a host processor or FPGA. Exact supply voltage ranges, reference requirements, and interface timing must be taken from the respective Analog Devices datasheets, as these parameters differ between the two parts.
What does the RL7 suffix indicate on the AD7684BRMZRL7?
The RL7 suffix denotes tape-and-reel packaging for automated assembly. The AD7684BRMZRL7 is supplied in a 10-lead MSOP package in reel format, whereas the AD7686CRMZ is specified without that reel designation. Both share the same package family but differ in delivery format.
Can the AD7684BRMZRL7 directly replace the AD7686CRMZ in an existing design?
A direct replacement is not recommended without validation. The AD7684BRMZRL7 has a lower maximum throughput (100 kSPS vs 500 kSPS) and a true differential input versus the pseudo-differential input of the AD7686CRMZ. The system timing, input drive circuitry, and firmware configuration must be re-verified against the target datasheet before substitution.