Part A
AD7683BRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5609 PCS
- Package
- MSOP-8
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7683ARM is a functionally compatible replacement candidate for the AD7683BRMZ, sharing the same 16-bit SAR ADC core, pseudo-differential input, and MSOP-8 footprint. The primary distinction is the grade-level operating temperature range, which requires validation against the target application's thermal profile before substitution.
Resolution and ADC Architecture
High match
Package and Pinout
High match
Operating Temperature Range
Validation required
Supply Voltage and Interface
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7683BRMZ | AD7683ARM | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is identical and does not affect substitutability. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical throughput means either part can meet the same acquisition timing requirements. |
| Input Type | Pseudo-differential, single-ended | Pseudo-differential, single-ended | Same input configuration allows direct replacement in the signal chain. |
| Supply Voltage (Analog & Digital) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply range ensures compatibility with the same power rails. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface means no firmware or host-side changes are needed. |
| Package / Case | 10-Lead MSOP (RM-10) | 10-Lead MSOP (RM-10) | Same footprint and pinout allow drop-in board replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same environmental conditions. |
| INL (Integral Nonlinearity) | ±1.0 LSB typ | ±1.0 LSB typ | Equivalent linearity performance preserves measurement accuracy in either option. |
| Power Consumption | 4.5 mW typ at 5 V, 100 kSPS | 4.5 mW typ at 5 V, 100 kSPS | Same power draw means thermal and supply budgeting remain unchanged. |
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 | AD7683ARM |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 100k |
| Data Interface | SPI, DSP | SPI, DSP |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Pseudo-Differential | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | - |
Frequently asked questions
What are the key differences between the AD7683BRMZ and AD7683ARM?
The AD7683BRMZ and AD7683ARM are both 16-bit, 100 kSPS PulSAR analog-to-digital converters from Analog Devices in a 10-lead MSOP package. The primary difference is the grade: the AD7683BRMZ is the B-grade version with specified performance over the −40°C to +85°C temperature range, while the AD7683ARM is the A-grade version. The B-grade offers tighter guaranteed specifications, such as lower integral nonlinearity (INL) and offset error, compared to the A-grade. Both share the same pinout and functional architecture.
Are the AD7683BRMZ and AD7683ARM pin-compatible and functionally interchangeable?
Yes. Both devices are offered in the same 10-lead MSOP (RM) package with an identical pin configuration, and both are 16-bit, 100 kSPS, charge-redistribution successive-approximation ADCs with a pseudo-differential input. They are functionally interchangeable at the board level, but the A-grade (AD7683ARM) has looser guaranteed specifications than the B-grade (AD7683BRMZ), so substitution should be validated against the accuracy requirements of the target design.
What are the guaranteed INL specifications for the AD7683BRMZ versus the AD7683ARM?
Per Analog Devices datasheet specifications, the AD7683BRMZ (B-grade) is guaranteed to ±1.0 LSB maximum integral nonlinearity (INL), while the AD7683ARM (A-grade) is guaranteed to ±2.0 LSB maximum INL. Designers requiring tighter linearity should select the B-grade device.
How do the offset and gain error specifications compare between the two grades?
The AD7683BRMZ (B-grade) is specified with a maximum offset error of ±1.5 mV and a maximum gain error of ±2.0 LSB, whereas the AD7683ARM (A-grade) is specified with a maximum offset error of ±3.0 mV and a maximum gain error of ±4.0 LSB. These tighter limits make the B-grade preferable for precision applications.
Do both the AD7683BRMZ and AD7683ARM support the same sampling rate and supply voltage?
Yes. Both devices are specified for a throughput rate of 100 kSPS and operate from a single 2.7 V to 5.5 V supply (VDD), with a separate VIO supply of 2.7 V to 5.5 V for the digital interface. Both use the same SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface and the same external reference input (REF).
What is the operating temperature range for the AD7683BRMZ and AD7683ARM?
Both the AD7683BRMZ and AD7683ARM are specified over the industrial temperature range of −40°C to +85°C. The grade suffix (B or A) refers to the guaranteed performance level, not to a different temperature range.
Can the AD7683ARM be used as a drop-in replacement for the AD7683BRMZ in an existing design?
Because both parts share the same package, pinout, supply requirements, interface, and 100 kSPS throughput, the AD7683ARM can be placed on the same PCB footprint. However, it is not a specification-equivalent replacement: the A-grade has wider guaranteed INL, offset error, and gain error limits than the B-grade. The substitution is acceptable only if the system's accuracy budget accommodates the A-grade limits.
Which grade should be selected for a precision measurement application?
For precision measurement applications requiring tighter linearity and lower offset and gain errors, the AD7683BRMZ (B-grade) is the appropriate choice, as it guarantees ±1.0 LSB maximum INL, ±1.5 mV maximum offset error, and ±2.0 LSB maximum gain error. The AD7683ARM (A-grade) is suitable for applications where the wider ±2.0 LSB INL and corresponding error limits are acceptable.