Part A
AD7989-5BRMZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6297 PCS
- Package
- MSOP-10
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7980ARMZ and AD7989-5BRMZ are both 16-bit successive-approximation ADCs in the same MSOP-10 package, but they differ in sampling rate, analog input range, and reference architecture. The AD7989-5BRMZ offers a faster throughput and a wider pseudo-differential input span, while the AD7980ARMZ provides a lower-speed, single-ended, reference-buffered solution. Designers should validate timing, input drive, and reference configuration before substituting one for the other in an existing layout.
Resolution and Linearity
Validation required
Sampling Rate
Not compatible
Analog Input Configuration
Not compatible
Package and Pinout
Validation required
Parts at a glance
Part B
AD7980ARMZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4535 PCS
- Package
- MSOP-10
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7989-5BRMZ | 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 | 500 kSPS | Maximum throughput determines the highest signal bandwidth the ADC can digitize; a slower part may not meet timing requirements of the original design. |
| Number of Input Channels | 1 (single-ended) | 1 (differential) | Single-ended versus differential input architecture affects signal conditioning, noise immunity, and the analog front-end circuitry required. |
| Input Type | Pseudo-differential / single-ended | Fully differential | Differential inputs reject common-mode noise and improve distortion performance, so the input topology must match the surrounding analog design. |
| Supply Voltage (Analog) | 2.5 V | 5 V | The analog supply voltage must be compatible with the board's power rails and affects input range and interface levels. |
| Digital Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Serial interface compatibility ensures the part can communicate with the existing host controller without protocol changes. |
| Package | 10-lead MSOP | 10-lead MSOP | Package footprint and pinout determine whether the part is a drop-in replacement on an existing PCB. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range must cover the application's environmental conditions for reliable operation. |
| Power Consumption | ~4 mW at 1 MSPS (2.5 V) | ~15 mW at 500 kSPS (5 V) | Power dissipation affects thermal design and battery life; a higher-power part may require supply or thermal changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7989-5BRMZ | AD7980ARMZ |
|---|---|---|
| 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 AD7980ARMZ and AD7989-5BRMZ?
The AD7980ARMZ is a 16-bit, 1 MSPS PulSAR ADC with a single-ended input, operating from a 2.5 V supply with a separate VIO supply. The AD7989-5BRMZ is a 16-bit, 500 kSPS PulSAR ADC with a fully differential input, operating from a 5 V supply. The AD7980 offers higher throughput and lower supply voltage, while the AD7989-5 provides a differential input structure and higher analog supply voltage for improved noise performance in differential signal chains.
Are the AD7980ARMZ and AD7989-5BRMZ pin-compatible?
No. Both devices are offered in a 10-lead MSOP package, but their pin functions differ. The AD7980 has a single-ended analog input (IN+ and IN- with IN- tied to GND or a reference), while the AD7989-5 has a true differential input pair (IN+ and IN-). The supply and interface pin assignments also differ, so the two devices are not drop-in replacements for each other.
What is the maximum sampling rate of each device?
The AD7980ARMZ supports a maximum throughput of 1 MSPS. The AD7989-5BRMZ supports a maximum throughput of 500 kSPS. The AD7980 is therefore suited to higher-speed acquisition, while the AD7989-5 targets applications where differential input and lower speed are acceptable.
What are the analog input configurations of the two ADCs?
The AD7980ARMZ has a single-ended analog input configuration, where the input signal is applied to IN+ and IN- is typically tied to ground or a reference. The AD7989-5BRMZ has a fully differential analog input, accepting a differential signal between IN+ and IN-, which provides improved common-mode rejection and better performance in differential signal chains.
What supply voltages do the AD7980ARMZ and AD7989-5BRMZ require?
The AD7980ARMZ operates from a 2.5 V analog supply (VDD) with a separate digital input/output supply (VIO) that can range from 1.8 V to 5 V, allowing flexible logic interfacing. The AD7989-5BRMZ operates from a 5 V analog supply (VDD) with a separate VIO supply for the digital interface. The differing analog supply voltages affect the input range and interface levels.
Do both devices use the same digital interface?
Both devices use a SPI-compatible serial interface with a CS and SCLK signal for reading conversion results. However, because the AD7980 supports 1 MSPS and the AD7989-5 supports 500 kSPS, the timing requirements and maximum SCLK rates differ. Designers must verify the interface timing against each device's datasheet when migrating between them.
Can the AD7980ARMZ and AD7989-5BRMZ share the same reference voltage?
Both devices use an external reference applied to the REF pin, and both support a reference voltage range suitable for their respective input spans. The AD7980 typically uses a 2.5 V to 5 V reference, while the AD7989-5 uses a reference compatible with its 5 V supply and differential input range. The reference requirements are not identical, so the reference circuit must be validated for each device.
Which device is better suited for differential signal acquisition?
The AD7989-5BRMZ is better suited for differential signal acquisition because it provides a fully differential analog input, which improves common-mode noise rejection and allows direct interface to differential sensors or amplifiers. The AD7980ARMZ has a single-ended input and is more appropriate for single-ended signal chains requiring higher throughput.