Part A
AD7989-5BRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6297 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 AD7989-5BRMZ is a functionally compatible replacement candidate for the AD7980BRMZRL7, sharing the same 16-bit SAR architecture, 10-lead MSOP package, and SPI-compatible serial interface, though the differing sample rate, analog input range, and reference configuration require validation against the target application's timing and signal-chain requirements.
Sample Rate
Validation required
Analog Input Range
Validation required
Package Type
High match
Digital Interface
High match
Parts at a glance
Part B
AD7980BRMZRL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6477 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 | AD7980BRMZRL7 | AD7989-5BRMZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 18 bit | Higher resolution provides finer quantization and lower quantization noise, directly affecting achievable SNR and dynamic range in precision measurement systems. |
| Sampling Rate | 1 MSPS | 500 kSPS | Maximum throughput determines the highest signal bandwidth that can be digitized and whether the part meets system update-rate requirements. |
| Input Type | Pseudo-differential (single-ended input with reference to GND) | Fully differential | Input topology dictates the analog front-end design; fully differential inputs reject common-mode noise and suit differential sensors, while pseudo-differential suits single-ended signals. |
| Analog Supply Voltage (VDD) | 2.5 V | 5 V | Supply voltage must match the board's power rails and affects input range, power dissipation, and interface logic levels. |
| Digital Interface Supply (VIO) | 1.8 V to 5.5 V (separate VIO) | 2.7 V to 5.5 V (VIO) | The logic supply range determines compatibility with host processors and level-shifting needs on the SPI interface. |
| Power Consumption | ~4 mW at 1 MSPS (2.5 V) | ~15 mW at 500 kSPS (5 V) | Power budget is critical in portable and high-channel-count systems; different consumption affects thermal design and supply sizing. |
| SNR (typical) | ~91 dB | ~98 dB | Signal-to-noise ratio defines the usable dynamic range and measurement accuracy for low-level signals. |
| INL (typical) | ±0.6 LSB | ±2.5 LSB | Integral nonlinearity indicates deviation from an ideal transfer function and impacts absolute accuracy in precision applications. |
| Package | 10-lead MSOP (RM) | 10-lead MSOP (RM) | Package footprint and pinout determine whether the parts are drop-in compatible on an existing PCB layout. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range confirms suitability for industrial environments and matches the system's environmental specification. |
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 | AD7989-5BRMZ | AD7980BRMZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 18 | 16 |
| Sampling Rate(Per Second) | 500k | 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 AD7980BRMZRL7 and the AD7989-5BRMZ?
The AD7980BRMZRL7 is a 16-bit, 1 MSPS PulSAR ADC with a pseudo-differential input and a 2.5 V to 5 V reference range, while the AD7989-5BRMZ is a 16-bit, 500 kSPS ADC with a fully differential input and an integrated 5 V reference. The AD7989-5BRMZ also includes a selectable digital filter and operates at a lower throughput, making it suited to lower-noise, higher-resolution applications.
Are the AD7980BRMZRL7 and AD7989-5BRMZ pin-compatible?
No. Both devices are offered in a 10-lead MSOP (RM package), but their pin functions differ: the AD7980 uses a pseudo-differential input structure with a REF pin, while the AD7989-5 integrates a 5 V reference and provides a fully differential input pair. A direct drop-in replacement is therefore not possible without verifying the pinout against the respective datasheets.
What are the maximum sampling rates of these two ADCs?
The AD7980BRMZRL7 supports a maximum throughput of 1 MSPS. The AD7989-5BRMZ supports a maximum throughput of 500 kSPS. The AD7980 is therefore the faster device when raw sample rate is the primary requirement.
Do both parts support the same serial interface?
Yes. Both the AD7980 and AD7989-5 use an SPI-compatible serial interface with a separate SDI, SDO, and CNV/SCK control scheme, allowing them to interface with common microcontrollers and DSPs. However, the AD7989-5 adds a selectable digital filter that affects output data timing, so the host timing must be validated for each part.
How do the input configurations differ between the AD7980BRMZRL7 and AD7989-5BRMZ?
The AD7980BRMZRL7 has a pseudo-differential input, where the negative input is typically tied to a fixed reference level and the positive input is driven by the signal. The AD7989-5BRMZ has a fully differential input, which improves common-mode rejection and is preferable for driving from differential signal chains such as fully differential amplifiers.
What reference voltage does each device require?
The AD7980BRMZRL7 requires an external reference in the range of 2.5 V to 5 V applied to the REF pin. The AD7989-5BRMZ includes an internal 5 V reference, reducing external component count, though an external reference can still be applied if required by the design.
Which part is better suited for low-power, high-speed data acquisition?
The AD7980BRMZRL7 is generally preferred for high-speed acquisition because it offers 1 MSPS throughput while maintaining low power consumption in the PulSAR family. The AD7989-5BRMZ trades maximum throughput for an integrated reference and digital filtering, which benefits lower-speed, precision-oriented designs.
Can the AD7989-5BRMZ replace the AD7980BRMZRL7 in an existing design?
Not directly. Although both are 16-bit ADCs in a 10-lead MSOP, differences in input topology (pseudo-differential vs. fully differential), reference architecture (external vs. integrated 5 V), maximum throughput (1 MSPS vs. 500 kSPS), and digital filter options mean the replacement requires schematic, layout, and firmware validation against the AD7989-5 datasheet.