Part A
AD7684BRMZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6195 PCS
- Package
- MSOP-8
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7683BRMZRL7 and AD7684BRMZRL7 are functionally interchangeable 16-bit SAR ADCs in identical MSOP-8 packages with matching pinouts and supply requirements, differing only in their digital interface configuration. The AD7684BRMZRL7 is a viable replacement candidate for the AD7683BRMZRL7, provided the host system's serial interface is validated against the differential DCLK/TIMING configuration of the AD7684.
Resolution and Architecture
High match
Package and Pinout
High match
Supply Voltage Range
High match
Digital Interface Type
Validation required
Parts at a glance
Part B
AD7683BRMZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6941 PCS
- Package
- MSOP-8
- 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 | AD7683BRMZRL7 | AD7684BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both converters provide the same 16-bit resolution, so system accuracy and LSB size are equivalent. |
| Number of Input Channels | 1 (single-ended) | 1 (differential) | Single-ended vs differential input architecture changes signal conditioning, common-mode rejection, and board layout requirements. |
| Input Type | Single-ended, pseudo-differential | Fully differential | Differential inputs reject common-mode noise and improve dynamic performance, while single-ended inputs simplify sensor interfacing. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical throughput means both parts support the same signal bandwidth and timing budget in the application. |
| Supply Voltage (VDD) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges allow either part to operate from the same rail without power architecture changes. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Identical serial interface simplifies firmware and digital host compatibility when substituting parts. |
| Package | 8-lead MSOP (RM-8) | 8-lead MSOP (RM-8) | Same package footprint enables drop-in PCB replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings ensure both parts meet the same environmental requirements. |
| Reference Input | External reference (REF) | External reference (REF) | Both require an external reference, but the reference range and input span differ with the input configuration, affecting full-scale accuracy. |
| Analog Input Voltage Range | 0 V to VREF (single-ended) | -VREF to +VREF (differential) | The input span determines the measurable signal range and how the sensor or front-end must be scaled. |
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 | AD7684BRMZRL7 | AD7683BRMZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 100k |
| 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 | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7683BRMZRL7 and AD7684BRMZRL7?
The AD7683BRMZRL7 is a 16-bit, 100 kSPS PulSAR analog-to-digital converter with a pseudo-differential input, while the AD7684BRMZRL7 is a 16-bit, 100 kSPS PulSAR ADC with a fully differential input. Both are offered in a 10-lead MSOP (RMZ) package and are supplied in tape-and-reel (RL7) format, but they differ in input configuration and therefore in the signal chain requirements they support.
Are the AD7683BRMZRL7 and AD7684BRMZRL7 pin-compatible?
Both devices are specified in the same 10-lead MSOP (RMZ) package, but pin compatibility for direct substitution must be confirmed against the respective manufacturer pinouts, because the analog input pins are configured differently (pseudo-differential versus fully differential). Designers should verify pin functions and the PCB land pattern against the official datasheets before considering a drop-in replacement.
Do both parts offer the same resolution and throughput?
Yes. Both the AD7683BRMZRL7 and AD7684BRMZRL7 are 16-bit successive-approximation (SAR) ADCs specified for 100 kSPS throughput, so they provide the same nominal resolution and sampling rate. The selection between them is therefore driven primarily by input configuration and system-level requirements rather than by resolution or speed.
What input configuration does each device support?
The AD7683BRMZRL7 provides a pseudo-differential input, where the negative input is typically tied to a reference or ground potential, making it suitable for single-ended signal sources referenced to a common potential. The AD7684BRMZRL7 provides a fully differential input, which is advantageous for rejecting common-mode noise and for driving from differential signal sources such as differential amplifiers or transformers.
Are both devices available in the same package and packing option?
Yes. Both the AD7683BRMZRL7 and AD7684BRMZRL7 use the RMZ suffix, denoting a 10-lead MSOP package, and the RL7 suffix, denoting tape-and-reel packaging. This common package and packing format simplifies inventory handling, but it does not by itself guarantee electrical or pin-level interchangeability.
Can the AD7683BRMZRL7 and AD7684BRMZRL7 be used interchangeably in an existing design?
They should not be treated as interchangeable without validation. Although both are 16-bit, 100 kSPS SAR ADCs in the same package, the pseudo-differential input of the AD7683BRMZRL7 and the fully differential input of the AD7684BRMZRL7 impose different driver, reference, and layout requirements. Any substitution must be verified against the manufacturer datasheets and the target design's signal chain.
Which device is better suited for differential signal sources?
The AD7684BRMZRL7 is the appropriate choice for differential signal sources because its fully differential input accepts and digitizes the difference between two complementary inputs, improving common-mode rejection. The AD7683BRMZRL7, with its pseudo-differential input, is better matched to single-ended sources referenced to a common potential.
Do both converters use the same digital interface?
Both devices are SAR converters that provide a serial digital output for connection to a host processor or FPGA. However, the exact interface timing, control signals, and readback protocol must be confirmed from the respective manufacturer datasheets, since the two parts are separate product families and should not be assumed to have identical digital timing without verification.