Part A
AD7982BRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1856 Stückzahl
- Package
- MSOP-10
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7980ARMZ and AD7982BRMZ are both 18-bit, 1 MSPS PulSAR successive-approximation ADCs in a 10-lead MSOP package with a serial SPI-compatible interface, making them strong functional replacement candidates. However, the AD7980ARMZ offers a single-ended input with a 2.5 V to 5 V reference range, while the AD7982BRMZ provides a fully differential input with a 4.096 V to 5 V reference range, so input configuration and reference requirements must be validated before substitution.
Resolution and Sample Rate
High match
Package Type
High match
Input Configuration
Validation required
Reference Voltage Range
Validation required
Parts at a glance
Part B
AD7980ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4535 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 | AD7980ARMZ | AD7982BRMZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 18 bit | Higher resolution provides finer quantization and better dynamic range, which directly affects measurement accuracy and substitutability in precision applications. |
| Sampling Rate | 1 MSPS | 1 MSPS | Maximum throughput determines how fast the ADC can digitize signals; matching rates allow similar system timing budgets. |
| Input Type | Pseudo-differential (single-ended) | Fully differential | Input topology affects signal conditioning, common-mode rejection, and driver amplifier requirements, so it strongly influences circuit redesign when substituting. |
| Number of Input Channels | 1 | 1 | Channel count determines how many signals can be digitized per device and whether external multiplexing is needed. |
| Supply Voltage (Analog) | 2.5 V | 5 V | Analog supply voltage affects input range, power, and interface levels; differing supplies may require level shifting or regulator changes. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Digital interface compatibility determines whether the part can drop into an existing host processor connection without firmware or hardware changes. |
| Package | 10-Lead MSOP | 10-Lead MSOP | Package and footprint compatibility is essential for physical substitutability on an existing PCB. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range determines suitability for industrial versus commercial environments and must match the application's environmental requirements. |
| Power Consumption | ~4 mW at 1 MSPS (2.5 V supply) | ~15 mW at 1 MSPS (5 V supply) | Power dissipation impacts thermal design, supply sizing, and battery life, and differs notably between these parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7982BRMZ | AD7980ARMZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 18 | 16 |
| Sampling Rate(Per Second) | 1M | 1M |
| 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 | 2.375V ~ 2.625V | 2.375V ~ 2.625V |
| Voltage - Supply, Digital | 2.375V ~ 2.625V | 2.375V ~ 2.625V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD7980ARMZ and AD7982BRMZ?
The AD7980ARMZ is a 16-bit, 1 MSPS PulSAR ADC with a pseudo-differential input, while the AD7982BRMZ is an 18-bit, 1 MSPS PulSAR ADC with a fully differential input. The AD7982BRMZ offers higher resolution (18-bit vs 16-bit) and a fully differential input structure, whereas the AD7980ARMZ provides a pseudo-differential input and lower power consumption in a smaller package.
Are the AD7980ARMZ and AD7982BRMZ pin-compatible?
No, they are not pin-compatible. The AD7980ARMZ is available in a 10-lead MSOP (RMZ suffix) package, while the AD7982BRMZ is available in a 10-lead MSOP as well, but the pin functions differ due to the pseudo-differential versus fully differential input architecture. The AD7980 has an IN- pin that serves as a reference sense, while the AD7982 has IN- as the negative differential input. Designers must verify pin functions against the respective datasheets before considering any layout reuse.
What is the resolution and throughput of each device?
The AD7980ARMZ provides 16-bit resolution at a maximum throughput of 1 MSPS. The AD7982BRMZ provides 18-bit resolution at a maximum throughput of 1 MSPS. Both devices use the PulSAR architecture and support serial SPI-compatible interfaces.
How do the input configurations differ between the AD7980ARMZ and AD7982BRMZ?
The AD7980ARMZ features a pseudo-differential input configuration, where the IN- pin is typically tied to a reference or ground sense. The AD7982BRMZ features a fully differential input, allowing true differential signal acquisition with improved common-mode rejection. This makes the AD7982BRMZ better suited for differential sensor interfaces, while the AD7980ARMZ suits single-ended or pseudo-differential signal chains.
What are the power consumption specifications for these ADCs?
The AD7980ARMZ typically consumes approximately 4 mW at 1 MSPS with a 2.5 V reference and 5 V supply, scaling with throughput. The AD7982BRMZ typically consumes approximately 7 mW at 1 MSPS. Both devices offer power scaling with sample rate, making them suitable for low-power applications. Designers should consult the respective datasheets for exact supply current versus throughput curves.
Can the AD7980ARMZ and AD7982BRMZ operate from the same supply voltages?
Both devices support a 2.5 V to 5 V analog supply (AVDD) and a 2.5 V to 5 V digital supply (DVDD), with a separate VIO supply for the digital interface. However, the AD7982BRMZ requires a 5 V reference for full 18-bit performance, while the AD7980ARMZ typically uses a 2.5 V to 5 V reference. Designers must confirm reference and supply rail compatibility for their specific application.
Which device is better suited for high-resolution precision measurement?
The AD7982BRMZ is better suited for high-resolution precision measurement because it offers 18-bit resolution and a fully differential input, which improves noise performance and common-mode rejection. The AD7980ARMZ, with 16-bit resolution and pseudo-differential input, is better suited for lower-power, space-constrained applications where 16-bit precision is sufficient.
Do both parts support the same digital interface?
Yes, both the AD7980ARMZ and AD7982BRMZ support a serial SPI-compatible interface with a dedicated SDO data output and CNV conversion input. Both are compatible with 1.8 V to 5 V logic supplies via the VIO pin, allowing direct connection to most microcontrollers and DSPs. However, timing parameters and register-free operation should be verified per datasheet.