Part A
AD7685BRMZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4839 PCS
- Package
- MSOP-10
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7685BRMZRL7 is a viable functional replacement candidate for the AD7683BRMZRL7, sharing the same 16-bit SAR architecture, MSOP-10 footprint, and 100 kSPS throughput class, though the designer must validate the differing serial interface timing and analog input range before committing to production.
Resolution and Architecture
High match
Package and Pinout
High match
Serial Interface Timing
Validation required
Analog Input Range
Validation required
Parts at a glance
Part B
AD7683BRMZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6941 PCS
- Package
- MSOP-8
- 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 | AD7683BRMZRL7 | AD7685BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is equivalent and does not differentiate substitutability. |
| Sampling Rate (max) | 100 kSPS | 250 kSPS | The AD7685 supports a higher throughput, which matters for faster signal acquisition and higher-bandwidth applications. |
| Input Type | Pseudo-differential, single-ended | Pseudo-differential, single-ended | Both accept pseudo-differential single-ended inputs, so the analog front-end topology is compatible. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface support means either part can drop into the same digital host connection. |
| Supply Voltage (VDD) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Same supply range allows operation from common 3 V or 5 V rails without redesign. |
| Package | 10-lead MSOP (RM) | 10-lead MSOP (RM) | Identical package and pin count support direct PCB footprint compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature grades ensure equivalent environmental robustness for industrial use. |
| Power Consumption (typical) | 4 mW at 5 V, 100 kSPS | 10 mW at 5 V, 250 kSPS | The AD7685 draws more power due to its higher throughput, which affects thermal and energy budgets. |
| Reference Type | External reference | External reference | Both require an external reference, so the reference circuit can be shared or 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 | AD7685BRMZRL7 | AD7683BRMZRL7 |
|---|---|---|
| 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 | 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 | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7683BRMZRL7 and AD7685BRMZRL7?
The AD7683BRMZRL7 is a 16-bit, 100 kSPS PulSAR analog-to-digital converter with a pseudo-differential input, while the AD7685BRMZRL7 is a 16-bit, 250 kSPS PulSAR ADC with a true differential input. Both are offered in a 10-lead MSOP (RMZ) package and operate from a 2.7 V to 5.5 V single supply, but they differ in throughput, input configuration, and serial interface timing.
Are the AD7683BRMZRL7 and AD7685BRMZRL7 pin-compatible?
Both devices are packaged in a 10-lead MSOP (RMZ) and share a similar pinout, but they are not functionally interchangeable without design verification. The AD7685 supports a higher throughput rate and a true differential input, so the digital timing, reference requirements, and analog front-end must be validated against the respective datasheets before substitution.
What is the maximum sampling rate of each device?
The AD7683BRMZRL7 supports a maximum throughput of 100 kSPS, while the AD7685BRMZRL7 supports up to 250 kSPS. The higher rate of the AD7685 requires correspondingly faster SPI clock timing and a suitable digital host interface.
What input configuration does each ADC provide?
The AD7683BRMZRL7 provides a pseudo-differential input, whereas the AD7685BRMZRL7 provides a true differential input. The differential input of the AD7685 can improve common-mode rejection and is suited to differential sensor or bridge interfaces, while the pseudo-differential input of the AD7683 references the negative input to a fixed potential.
Do both parts use the same serial interface?
Both devices use an SPI-compatible serial interface, but the AD7685BRMZRL7 supports the higher 250 kSPS throughput and therefore requires a faster serial clock (SCK) and appropriate CS/SDO timing per its datasheet. The host firmware timing must be re-validated when migrating between the two parts.
What supply voltage and reference requirements apply to both devices?
Both the AD7683BRMZRL7 and AD7685BRMZRL7 operate from a single 2.7 V to 5.5 V supply and use an external reference (REF) to set the full-scale input range. The reference voltage and analog input range must be configured per the respective datasheet for each part.
Can the AD7685BRMZRL7 directly replace the AD7683BRMZRL7 in an existing design?
Not without validation. Although both are 16-bit, 10-lead MSOP PulSAR ADCs, the AD7685 offers a higher 250 kSPS throughput and a true differential input versus the AD7683's 100 kSPS pseudo-differential input. The analog front-end, reference, and digital timing must be verified against the AD7685 datasheet before substitution.