Part A
AD7685CRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5270 Stückzahl
- Package
- MSOP-10
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7685CRMZ is a viable functional replacement candidate for the AD7685BRMZRL7, as both parts share the same 16-bit SAR ADC architecture, 250 kSPS throughput, and MSOP-10 footprint. The primary distinction lies in the operating temperature grade, with the CRMZ rated for the extended industrial range, making it suitable for the same core applications while requiring validation of thermal and accuracy performance in the target environment.
Resolution and Throughput
High match
Package Type
High match
Operating Temperature Range
Validation required
Interface Type
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 | AD7685CRMZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both parts provide the same ADC resolution, so measurement precision is equivalent. |
| Sampling Rate | 250 kSPS | 250 kSPS | Identical throughput means either part supports the same signal bandwidth and timing budget. |
| Number of Inputs / Channels | 1 single-ended | 1 single-ended | Same channel count and input configuration allow direct functional substitution in the signal chain. |
| Input Type | Pseudo-differential | Pseudo-differential | Matching input architecture ensures the same interface to the sensor or front-end circuitry. |
| Supply Voltage (Analog & Digital) | 2.3 V to 5.5 V | 2.3 V to 5.5 V | Same supply range means both parts work in the same power rail design without changes. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface allows the same microcontroller or DSP connection and firmware. |
| Package / Mounting | 10-Lead MSOP, Surface Mount | 10-Lead MSOP, Surface Mount | Same package and footprint enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings ensure both parts meet the same environmental requirements. |
| Reference Type | External | External | Both require an external reference, so the same reference circuit can be reused. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7685CRMZ | AD7685BRMZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 250k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-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 | 2.3V ~ 5.5V | 2.3V ~ 5.5V |
| Voltage - Supply, Digital | 2.3V ~ 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 AD7685CRMZ?
Both parts are 16-bit, 250 kSPS PulSAR analog-to-digital converters in a 10-lead MSOP package and share the same core specifications. The primary difference is the operating temperature grade: the AD7685BRMZRL7 is specified over the industrial temperature range of −40°C to +85°C, while the AD7685CRMZ is specified over the extended industrial range of −40°C to +125°C. The "RL7" suffix on the BRMZRL7 indicates tape-and-reel packaging, whereas the CRMZ is supplied in tube form.
Are the AD7685BRMZRL7 and AD7685CRMZ pin-compatible and functionally interchangeable?
Yes. Both devices are offered in the same 10-lead MSOP (RM) package with identical pin functions, and they share the same 16-bit resolution, 250 kSPS throughput, and SPI-compatible serial interface. They are functionally interchangeable, provided the target design's thermal requirements are satisfied by the selected temperature grade.
What is the resolution and throughput of these AD7685 devices?
Both the AD7685BRMZRL7 and AD7685CRMZ are 16-bit successive-approximation (SAR) ADCs with a maximum throughput of 250 kSPS. They operate from a single 2.7 V to 5.5 V supply and feature a pseudo-differential analog input.
Which temperature grade should be selected for a high-temperature application?
For ambient temperatures above +85°C, the AD7685CRMZ should be selected because it is specified over the −40°C to +125°C extended industrial range. The AD7685BRMZRL7 is only specified to +85°C and should not be used beyond that limit without additional validation.
What interface do the AD7685BRMZRL7 and AD7685CRMZ use?
Both devices use a serial peripheral interface (SPI)-compatible serial interface that supports daisy-chaining and is compatible with standard digital hosts. The interface operates from the same supply and supports both 3-wire and 4-wire configurations.
Do the AD7685BRMZRL7 and AD7685CRMZ differ in packaging or delivery format?
Yes. The AD7685BRMZRL7 is supplied in tape-and-reel format (the "RL7" suffix), which is suited to automated pick-and-place production. The AD7685CRMZ is supplied in standard tube packaging. Both use the same 10-lead MSOP body.
Can the AD7685BRMZRL7 be used as a drop-in replacement for the AD7685CRMZ in an existing design?
Because both parts share the same package, pinout, resolution, throughput, and interface, the AD7685BRMZRL7 can serve as a drop-in replacement for the AD7685CRMZ only if the application's maximum ambient temperature does not exceed +85°C. For operation up to +125°C, the AD7685CRMZ must be retained.