Part A
AD7982BRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1856 個数
- Package
- MSOP-10
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7980ARMZRL7 and AD7982BRMZ are both 18-bit successive-approximation ADCs in 10-lead MSOP packages with identical pinout and SPI-compatible serial interfaces, making them strong functional replacement candidates. However, they differ in maximum sample rate (1 MSPS vs 1 MSPS), analog input configuration (single-ended pseudo-differential vs fully differential), and reference architecture, so the replacement is viable only after validating the input drive, reference, and timing requirements against the target application.
Resolution and Accuracy
High match
Package and Pinout
High match
Analog Input Configuration
Validation required
Reference Architecture
Validation required
Parts at a glance
Part B
AD7980ARMZRL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4200 個数
- Package
- MSOP-10
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7980ARMZRL7 | AD7982BRMZ | 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 how fast the system can acquire samples; matching rates means timing budgets are preserved. |
| Input Type | Pseudo-differential (single-ended) | Fully differential | Input topology dictates the required front-end driver and affects common-mode rejection and noise immunity; a fully differential input needs a differential driver. |
| Analog Supply Voltage | 2.5 V | 5 V | Supply voltage must match the board's power rails and affects input range and interface levels; a mismatch requires power redesign. |
| Digital Interface Supply (VIO) | 2.5 V to 5 V | 2.5 V to 5 V | VIO sets the logic levels for the SPI interface; flexible VIO allows direct connection to various host controllers. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Serial interface compatibility ensures the part can drop into existing digital buses without protocol changes. |
| Package | 10-lead MSOP | 10-lead MSOP | Package footprint and pinout determine PCB layout compatibility; identical packages simplify board rework. |
| INL (max) | ±1.0 LSB | ±2.5 LSB | Integral nonlinearity bounds absolute accuracy; a larger INL reduces guaranteed linearity performance. |
| SNR (typ) | 91.5 dB | 98 dB | Signal-to-noise ratio defines the usable dynamic range; the 18-bit part offers higher SNR for low-level signal detection. |
| Power Consumption (typ) | 4 mW at 1 MSPS | 15 mW at 1 MSPS | Power draw affects thermal budget and battery life; the higher-resolution part consumes significantly more power. |
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 | AD7982BRMZ | AD7980ARMZRL7 |
|---|---|---|
| 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 AD7980ARMZRL7 and the AD7982BRMZ?
The AD7980ARMZRL7 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 AD7982 offers higher resolution (18-bit vs 16-bit) and true differential input architecture, whereas the AD7980 provides a pseudo-differential input and is available in a 10-lead MSOP package (RMZ suffix). Both operate at 1 MSPS and use a serial SPI-compatible interface.
Are the AD7980ARMZRL7 and AD7982BRMZ pin-compatible?
No. The AD7980ARMZRL7 is supplied in a 10-lead MSOP (RMZ) package, while the AD7982BRMZ is supplied in a 10-lead MSOP as well, but the two devices have different input configurations (pseudo-differential vs fully differential) and should not be treated as pin-for-pin drop-in replacements without verifying the pin functions and input topology against the respective datasheets.
What is the resolution and throughput of each device?
The AD7980ARMZRL7 provides 16-bit resolution at a throughput of 1 MSPS. The AD7982BRMZ provides 18-bit resolution at a throughput of 1 MSPS. Both are successive-approximation register (SAR) ADCs using the PulSAR architecture.
What input configuration does each ADC support?
The AD7980ARMZRL7 has a pseudo-differential input, where the negative input is typically tied to a reference level and the positive input is measured relative to it. The AD7982BRMZ has a fully differential input, allowing true differential signal acquisition with improved common-mode rejection and reduced even-order distortion.
What digital interface do these ADCs use?
Both the AD7980ARMZRL7 and AD7982BRMZ use a serial SPI-compatible interface supporting both CS and daisy-chain modes, allowing direct connection to DSPs, FPGAs, and microcontrollers. Both support a 1.8 V to 5 V logic interface (VIO supply).
What are the supply voltage requirements for these devices?
Both devices operate from a single 2.5 V analog supply (VDD) with a separate 1.8 V to 5 V digital interface supply (VIO). The AD7980ARMZRL7 and AD7982BRMZ both require an external reference voltage (REF) for conversion.
Which device should be selected for higher precision applications?
The AD7982BRMZ should be selected when higher precision is required, as it offers 18-bit resolution compared to the 16-bit resolution of the AD7980ARMZRL7. The AD7982BRMZ also provides a fully differential input, which is advantageous for AC performance and noise immunity in precision measurement systems.
Are these devices suitable for battery-powered or portable applications?
Both the AD7980ARMZRL7 and AD7982BRMZ are SAR ADCs with low power consumption and are available in small 10-lead MSOP packages, making them suitable for portable and battery-powered applications. Actual power figures should be confirmed from the respective manufacturer datasheets for the specific operating conditions.