Part A
AD7980BRMZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6477 PCS
- Package
- MSOP-10
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7980ARMZRL7 and AD7980BRMZRL7 are functionally interchangeable 16-bit PulSAR ADCs sharing identical package, pinout, and core specifications, with the B-grade offering a tighter INL and DNL linearity tolerance. The A-grade can serve as a drop-in substitute for the B-grade in most applications, provided the system's accuracy budget accommodates the wider linearity error; conversely, the B-grade is a direct upgrade path where tighter integral and differential nonlinearity are required.
Resolution and Sample Rate
High match
Package and Pinout
High match
Supply and Interface
High match
INL and DNL Linearity Grade
Validation required
Parts at a glance
Part B
AD7980ARMZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4200 PCS
- Package
- MSOP-10
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD7980BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is identical and does not affect substitutability. |
| Sampling Rate | 1 MSPS | 1 MSPS | Identical throughput means either part supports the same signal bandwidth and timing budget. |
| INL (Integral Nonlinearity) | ±1.0 LSB max | ±0.5 LSB max | The B-grade offers tighter linearity, which improves accuracy in precision measurement applications. |
| DNL (Differential Nonlinearity) | ±1.0 LSB max | ±0.5 LSB max | Better DNL in the B-grade ensures no missing codes and more uniform transfer characteristics. |
| Transition Noise | 0.5 LSB rms typ | 0.4 LSB rms typ | Lower transition noise in the B-grade yields better SNR and more stable LSB decisions. |
| SNR (Signal-to-Noise Ratio) | 91 dB typ | 91.5 dB typ | Slightly higher SNR in the B-grade improves dynamic range for AC signal acquisition. |
| THD (Total Harmonic Distortion) | -110 dB typ | -115 dB typ | Better THD in the B-grade reduces harmonic artifacts in spectral analysis applications. |
| Supply Voltage (VDD) | 2.375 V to 2.625 V | 2.375 V to 2.625 V | Identical supply range means both parts are drop-in compatible for power design. |
| Package | 10-Lead MSOP | 10-Lead MSOP | Same package and pinout allow direct board-level substitution without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature range ensures both parts suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7980BRMZRL7 | AD7980ARMZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-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 ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD7980ARMZRL7 and AD7980BRMZRL7?
Both are 16-bit, 1 MSPS PulSAR analog-to-digital converters in a 10-lead MSOP package. The primary difference is the grade: the AD7980BRMZRL7 offers a higher guaranteed INL specification (±0.6 LSB typical, ±1.0 LSB max) compared to the AD7980ARMZRL7 (±0.6 LSB typical, ±1.5 LSB max), along with tighter offset and gain error limits. The B-grade is specified over the same −40°C to +125°C temperature range but with tighter accuracy tolerances.
Are the AD7980ARMZRL7 and AD7980BRMZRL7 pin-compatible and package-compatible?
Yes. Both devices are offered in the same 10-lead MSOP (RM) package with identical pinout and footprint, so they are drop-in compatible from a PCB layout and pin function perspective. The "RL7" suffix indicates tape-and-reel packaging for both parts.
Can the AD7980ARMZRL7 be substituted with the AD7980BRMZRL7 in an existing design?
Yes, the B-grade is a higher-accuracy grade of the same converter and is pin-compatible, so it can generally be used as a drop-in replacement where tighter INL and offset/gain error specifications are beneficial. The A-grade should not be substituted for a B-grade design if the design relies on the tighter B-grade accuracy limits, since the A-grade has wider guaranteed error tolerances.
What are the resolution and throughput specifications of these AD7980 variants?
Both the AD7980ARMZRL7 and AD7980BRMZRL7 are 16-bit successive-approximation (SAR) ADCs with a maximum throughput of 1 MSPS. They operate from a 2.5 V supply with a separate VIO supply for digital interface flexibility and use a pseudo-differential input with a 0 V to VREF range.
Do the AD7980ARMZRL7 and AD7980BRMZRL7 support the same digital interface?
Yes. Both parts provide an SPI-compatible serial interface (3-wire or 4-wire) with a separate VIO supply, allowing direct connection to 1.8 V, 2.5 V, 3 V, or 5 V logic. The interface timing and functionality are identical between the A and B grades.
What is the operating temperature range for these two AD7980 grades?
Both the AD7980ARMZRL7 and AD7980BRMZRL7 are specified over the industrial temperature range of −40°C to +125°C, making them suitable for industrial and instrumentation applications requiring wide-temperature operation.
Which grade should be selected for a design requiring tight DC accuracy?
The AD7980BRMZRL7 should be selected when tighter guaranteed INL (±1.0 LSB max vs ±1.5 LSB max) and tighter offset and gain error limits are required. The AD7980ARMZRL7 is appropriate where the wider A-grade error tolerances are acceptable and cost is a primary consideration.