Part A
AD7683BRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5609 PCS
- Package
- MSOP-8
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7683BRMZ is a viable functional replacement candidate for the AD7685ARMZRL7 in many precision data-acquisition designs, as both are 16-bit successive-approximation ADCs with comparable resolution and pseudo-differential input architecture. However, the two devices differ in package footprint, sample throughput, and serial interface timing, so the replacement is not a true drop-in and requires layout and firmware validation before adoption.
Resolution and ADC Architecture
High match
Package and Footprint
Validation required
Sample Rate
Validation required
Serial Interface Timing
Validation required
Parts at a glance
Part B
AD7685ARMZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1265 PCS
- Package
- MSOP-10
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD7685ARMZRL7 | AD7683BRMZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is equivalent and not a differentiator for substitutability. |
| Sampling Rate | 250 kSPS | 100 kSPS | The AD7685 supports a higher throughput, which matters for faster signal acquisition and higher-bandwidth applications. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both are single-channel devices, so channel count is not a differentiator. |
| Input Type | Single-ended | Single-ended | Identical input configuration means the same signal conditioning front-end can be reused. |
| Interface | SPI / DSP / QSPI / MICROWIRE compatible | SPI / DSP / QSPI / MICROWIRE compatible | Matching serial interfaces allow drop-in digital connectivity with the same host controller. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Same supply range means the same power rail can be used without redesign. |
| Package / Mounting | 10-Lead MSOP (surface mount) | 8-Lead MSOP (surface mount) | Different pin counts and footprints require layout changes, affecting direct board-level substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean equivalent environmental robustness. |
| Power Consumption | Typically ~3.5 mW at 5 V, 250 kSPS | Typically ~1.5 mW at 5 V, 100 kSPS | Lower power in the AD7683 benefits battery-powered and thermally constrained 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 | AD7683BRMZ | AD7685ARMZRL7 |
|---|---|---|
| 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 | 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 | 2.7V ~ 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 AD7685ARMZRL7 and the AD7683BRMZ?
The AD7685ARMZRL7 is a 16-bit, 250 kSPS PulSAR analog-to-digital converter, while the AD7683BRMZ is a 16-bit, 100 kSPS PulSAR ADC. Both are successive-approximation register (SAR) ADCs with a pseudo-differential input, but they differ in throughput rate, package, and interface timing characteristics. The AD7685ARMZRL7 is supplied in a 10-lead MSOP (RM) package in tape and reel, whereas the AD7683BRMZ is supplied in an 8-lead MSOP (RM) package.
Are the AD7685ARMZRL7 and AD7683BRMZ pin-compatible?
No. The AD7685ARMZRL7 uses a 10-lead MSOP package, while the AD7683BRMZ uses an 8-lead MSOP package. The pin counts and pin functions differ, so they are not drop-in replacements and require different PCB land patterns.
What is the maximum sampling rate of each device?
The AD7685ARMZRL7 supports a maximum throughput of 250 kSPS. The AD7683BRMZ supports a maximum throughput of 100 kSPS. Both are specified for 16-bit resolution with no missing codes.
Do both ADCs use the same serial interface?
Both devices provide a serial digital output compatible with SPI, QSPI, MICROWIRE, and DSP interface standards. However, because the AD7685ARMZRL7 and AD7683BRMZ have different throughput ratings and package pinouts, the timing parameters and the number of interface pins differ, so the host interface configuration must be validated separately for each part.
What are the analog input configurations of these two ADCs?
Both the AD7685ARMZRL7 and the AD7683BRMZ feature a pseudo-differential analog input, where the input is measured with respect to a reference and the negative input is typically tied to a fixed potential such as ground. The full-scale input range is set by the external reference voltage applied to the REF pin.
What supply voltages do the AD7685ARMZRL7 and AD7683BRMZ require?
Both devices operate from a single 2.7 V to 5.5 V analog supply (VDD) and a separate 1.8 V to 5.5 V digital supply (VIO) for the serial interface, allowing direct connection to low-voltage logic. The external reference voltage sets the full-scale input range independently of the supply.
Can the AD7683BRMZ be used as a lower-speed substitute for the AD7685ARMZRL7?
Functionally both are 16-bit pseudo-differential SAR ADCs, but the AD7683BRMZ has a lower maximum throughput (100 kSPS versus 250 kSPS) and a different package and pinout. A substitution is only possible after verifying that the reduced throughput is acceptable and that the PCB layout and interface timing are redesigned for the 8-lead MSOP package of the AD7683BRMZ.
What package and ordering options distinguish the AD7685ARMZRL7 from the AD7683BRMZ?
The AD7685ARMZRL7 is offered in a 10-lead MSOP package and the suffix RL7 indicates tape-and-reel packaging. The AD7683BRMZ is offered in an 8-lead MSOP package. Both are RoHS-compliant. Designers should confirm the exact package and packing option against the respective manufacturer datasheet before ordering.