Part A
AD7982BRMZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4697 PCS
- Package
- MSOP-10
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7980ARMZ and AD7982BRMZRL7 are both 18-bit successive-approximation ADCs in the same 10-lead MSOP package, but they differ in resolution, sample rate, and analog input architecture. The AD7982BRMZRL7 offers higher resolution and a fully differential input, while the AD7980ARMZ provides a faster throughput with a single-ended input. Designers should validate the input configuration and timing before substituting one for the other.
Resolution
Validation required
Sample Rate
Validation required
Analog Input Type
Validation required
Package Type
High match
Parts at a glance
Part B
AD7980ARMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4535 PCS
- Package
- MSOP-10
- Series
- Data Acquisition - 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 | AD7982BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 18 | Higher resolution provides finer quantization and lower quantization noise, directly affecting achievable dynamic range and measurement precision. |
| Sampling Rate (max) | 1 MSPS | 1 MSPS | Maximum throughput determines the highest signal bandwidth that can be digitized without aliasing for a given application. |
| Input Type | Pseudo-differential (single-ended) | Fully differential | Fully differential inputs reject common-mode noise and improve distortion performance, while pseudo-differential inputs simplify single-ended signal interfacing. |
| Analog Input Range | 0 V to VREF (single-ended) | ±VREF (differential) | The input span must match the sensor or signal chain output to avoid clipping or loss of dynamic range. |
| SNR (typ) | 91.5 dB | 98 dB | Signal-to-noise ratio defines the noise floor and effective number of bits achievable in the target application. |
| THD (typ) | -110 dB | -120 dB | Total harmonic distortion indicates linearity and spectral purity, critical for AC measurement and audio/industrial signal acquisition. |
| INL (max) | ±1.0 LSB | ±2.5 LSB | Integral nonlinearity bounds absolute accuracy and affects calibration requirements in precision measurement systems. |
| Supply Voltage | 2.5 V (VDD), 2.5 V to 5 V (VIO) | 2.5 V (VDD), 2.5 V to 5 V (VIO) | Supply requirements determine compatibility with the host logic and power rail architecture of the system. |
| Package | 10-lead MSOP | 10-lead MSOP | Package footprint and pinout affect PCB layout compatibility and whether a drop-in substitution is possible. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Serial interface compatibility ensures the ADC can connect to the existing digital host without protocol changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7982BRMZRL7 | 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 AD7982BRMZRL7?
The AD7980ARMZ is a 16-bit, 1 MSPS PulSAR ADC with a pseudo-differential input, while the AD7982BRMZRL7 is an 18-bit, 1 MSPS PulSAR ADC with a fully differential input. Both are available in a 10-lead MSOP package and operate from a 2.5 V supply, but they differ in resolution, input configuration, and specified performance grades.
Do the AD7980ARMZ and AD7982BRMZRL7 share the same package and pinout?
Yes. Both devices are offered in a 10-lead MSOP (RM) package with the same pin functions, including VDD, VIO, GND, REF, IN+/IN-, CNV, SDO, SCK, and SDI. This common pinout supports layout reuse, but electrical differences must still be validated before substitution.
What is the resolution and sample rate of each device?
The AD7980ARMZ provides 16-bit resolution at up to 1 MSPS. The AD7982BRMZRL7 provides 18-bit resolution at up to 1 MSPS. Both use the PulSAR architecture and support a serial SPI-compatible interface.
How do the analog input configurations differ between the two ADCs?
The AD7980ARMZ has a pseudo-differential input structure, where IN- is typically tied to a reference level and IN+ swings around it. The AD7982BRMZRL7 has a fully differential input, allowing IN+ and IN- to be driven differentially for improved common-mode rejection and signal swing.
Are the reference and supply requirements the same for both parts?
Both devices operate from a 2.5 V VDD supply and use an external reference applied to the REF pin. The AD7980ARMZ typically uses a 2.5 V or 5 V reference depending on the input range configuration, while the AD7982BRMZRL7 uses a reference that sets the differential input range. The exact reference voltage and VIO level should be confirmed against the respective datasheets for the target design.
Can the AD7980ARMZ be used as a drop-in replacement for the AD7982BRMZRL7?
No. Although the package and pinout are compatible, the AD7980ARMZ is 16-bit with a pseudo-differential input, while the AD7982BRMZRL7 is 18-bit with a fully differential input. Resolution, input drive requirements, and transfer characteristics differ, so a direct drop-in replacement is not valid without redesign and validation.
What interface do both ADCs use for digital communication?
Both devices use a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interfaces. The interface includes CNV, SCK, SDO, and SDI pins, and both support daisy-chain and busy-indicator modes as described in their respective datasheets.
Which device is better suited for higher dynamic range applications?
The AD7982BRMZRL7 is generally better suited for higher dynamic range applications because it offers 18-bit resolution and a fully differential input, which supports improved SNR and common-mode rejection compared with the 16-bit pseudo-differential AD7980ARMZ. Final selection should be based on the required SNR, input range, and system accuracy targets.