Part A
AD7982BRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1856 PCS
- Package
- MSOP-10
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7988-5BRMZ and AD7982BRMZ share the same 10-lead MSOP footprint, 18-bit SAR architecture, and 5 V supply, making them viable functional substitutes in many designs. However, the AD7988-5BRMZ offers a 500 kSPS throughput with a pseudo-differential input, while the AD7982BRMZ provides a true fully differential input at 1 MSPS, so the substitution requires validation of input configuration and timing margin against the target application.
Package Type
High match
Resolution
High match
Input Configuration
Validation required
Sampling Rate
Validation required
Parts at a glance
Part B
AD7988-5BRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6169 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 | AD7988-5BRMZ | AD7982BRMZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 18 bit | Higher resolution provides finer quantization and lower quantization noise, directly affecting achievable dynamic range and precision in the application. |
| Maximum Sample Rate | 500 kSPS | 1 MSPS | Sample rate determines the maximum signal bandwidth that can be captured and is a primary constraint for high-speed acquisition systems. |
| Input Type | Pseudo-differential (single-ended referenced) | Fully differential | Fully differential inputs reject common-mode noise and improve distortion performance, while pseudo-differential inputs simplify single-ended signal interfacing. |
| SNR (typical) | 91.5 dB | 98 dB | Signal-to-noise ratio defines the usable dynamic range and noise floor, which is critical for precision measurement and low-level signal detection. |
| INL (typical) | ±0.6 LSB | ±1.0 LSB | Integral nonlinearity indicates deviation from an ideal transfer function and affects absolute accuracy of the digitized result. |
| Supply Voltage (analog & digital) | 2.375 V to 2.625 V | 2.375 V to 2.625 V (VDD), 1.8 V to 5 V (VIO) | Supply requirements determine power rail compatibility and whether the device can interface directly with the host logic without level shifting. |
| Power Consumption (typical) | 3.5 mW at 500 kSPS | 9 mW at 1 MSPS | Power consumption affects thermal budget and battery life, and scales with throughput, so it must be evaluated against the system's energy constraints. |
| Package | 10-lead MSOP | 10-lead MSOP | Package footprint and pinout determine whether the parts are drop-in compatible on an existing PCB layout. |
| Interface | SPI-compatible serial (CS, SCLK, SDO) | SPI-compatible serial (CS, SCLK, SDO) | Serial interface compatibility ensures the ADC can connect to the same digital host and firmware without protocol changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The rated temperature range confirms suitability for industrial and harsh-environment applications and affects guaranteed performance limits. |
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 | AD7988-5BRMZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 18 | 16 |
| Sampling Rate(Per Second) | 1M | 500k |
| 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 architectural differences between the AD7988-5BRMZ and AD7982BRMZ?
The AD7988-5BRMZ is a 16-bit, 500 kSPS PulSAR successive-approximation 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 and a faster maximum throughput, whereas the AD7988-5 targets lower-power, lower-speed applications.
Do the AD7988-5BRMZ and AD7982BRMZ share the same package and pinout?
Both devices are offered in a 10-lead MSOP (RMZ suffix) package and use the same pin functions (VDD, VIO, GND, IN+/IN-, REF, CNV, SDI, SDO, SCK). However, the analog input configuration differs (pseudo-differential vs. fully differential), so the input drive circuitry must be validated before any substitution.
How do the throughput and resolution of the two converters compare?
The AD7988-5BRMZ provides 16-bit resolution at up to 500 kSPS, while the AD7982BRMZ provides 18-bit resolution at up to 1 MSPS. The AD7982 therefore delivers four times the throughput and two additional bits of resolution compared with the AD7988-5.
What are the reference voltage requirements for each part?
Both ADCs use an external reference applied to the REF pin. The AD7988-5BRMZ operates with a reference from 2.4 V to 5.1 V, and the AD7982BRMZ operates with a reference from 2.4 V to 5.1 V as well. The reference voltage directly sets the full-scale input range, so the reference source must be selected to match the required input span.
How do the analog input configurations differ between the AD7988-5BRMZ and AD7982BRMZ?
The AD7988-5BRMZ has a pseudo-differential input, where IN- is typically tied to a fixed potential and IN+ swings around it. The AD7982BRMZ has a true fully differential input, so both IN+ and IN- must be driven with complementary signals. This affects the choice of driving amplifier and the achievable common-mode rejection.
Can the AD7988-5BRMZ be used as a drop-in replacement for the AD7982BRMZ?
No. Although both are 10-lead MSOP PulSAR ADCs, they differ in resolution (16-bit vs. 18-bit), maximum throughput (500 kSPS vs. 1 MSPS), and input topology (pseudo-differential vs. fully differential). A direct drop-in replacement is not supported; the design must be revalidated for resolution, timing, input drive, and reference requirements.
What are the supply voltage requirements for these two ADCs?
Both the AD7988-5BRMZ and AD7982BRMZ use a VDD analog supply of 2.5 V to 5.5 V and a VIO digital interface supply of 1.8 V to 5.5 V, allowing direct interfacing to a range of host processors and FPGAs.
Which serial interface do the AD7988-5BRMZ and AD7982BRMZ use?
Both devices use an SPI-compatible serial interface with CNV, SCK, SDI, and SDO pins, supporting daisy-chain and busy-indicator modes. The interface timing must be checked against the respective datasheet because the maximum SCK rate and conversion timing differ between the 500 kSPS and 1 MSPS parts.