Part A
AD7684BRMZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6195 Stückzahl
- Package
- MSOP-8
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7683BRMZ and AD7684BRMZRL7 are functionally compatible 16-bit SAR ADCs sharing the same resolution, supply range, and MSOP-8 footprint, making them viable substitutes in most designs. The AD7684BRMZRL7 offers a differential input structure and a wider operating temperature range, while the AD7683BRMZ provides a single-ended input with a slightly higher throughput rate. Designers should validate input configuration and thermal margin before final substitution.
Resolution
High match
Package Type
High match
Input Configuration
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD7683BRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5609 Stückzahl
- Package
- MSOP-8
- Series
- Datenerfassung mit Analog to Digital Converters (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 | AD7683BRMZ | AD7684BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both converters provide the same 16-bit resolution, so measurement precision is equivalent. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical throughput means either part can support the same signal bandwidth and update rate. |
| Number of Input Channels | 1 (single-ended) | 1 (fully differential) | The input configuration differs: single-ended versus fully differential, which affects signal conditioning and noise immunity requirements. |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Same supply range allows both parts to operate from common system rails without redesign. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface compatibility simplifies digital host connection and firmware reuse. |
| Package | 8-lead MSOP | 8-lead MSOP | Same package footprint enables drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings ensure both parts suit the same industrial environments. |
| Input Type | Pseudo-differential (single-ended) | True differential | Differential input offers better common-mode rejection and dynamic performance, so the choice affects analog front-end design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7684BRMZRL7 | AD7683BRMZ |
|---|---|---|
| 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 AD7683BRMZ and AD7684BRMZRL7?
The AD7683BRMZ 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 true differential input. Both are offered in a 10-lead MSOP package and operate from a 2.7 V to 5.5 V single supply, but they differ in input configuration and interface timing characteristics.
Are the AD7683BRMZ and AD7684BRMZRL7 pin-compatible?
Both devices are packaged in a 10-lead MSOP (RM suffix) and share the same pin count and package outline, but the analog input pin functions differ: the AD7683BRMZ provides a pseudo-differential input (IN+ and IN- with IN- referenced to a fixed level), whereas the AD7684BRMZRL7 provides a true differential input (IN+ and IN-). Designers must verify pin function assignments against the respective datasheets before considering a layout substitution.
Do both ADCs support the same serial interface?
Yes. Both the AD7683BRMZ and AD7684BRMZRL7 use a 3-wire or 4-wire SPI-compatible serial interface (CS, SCLK, SDO, and optionally SDI for daisy-chain or busy indicator modes). Both are compatible with standard DSP and microcontroller serial ports, but the exact timing parameters (such as acquisition time and SCLK frequency limits) should be confirmed from each device's datasheet.
What is the resolution and throughput of these ADCs?
Both the AD7683BRMZ and AD7684BRMZRL7 are 16-bit successive-approximation PulSAR ADCs with a maximum throughput of 100 kSPS. They provide no missing codes at 16 bits and are specified for operation from a single 2.7 V to 5.5 V supply.
Can the AD7684BRMZRL7 be used as a drop-in replacement for the AD7683BRMZ?
Not as a direct drop-in replacement without design review. Although both are 16-bit, 100 kSPS, 10-lead MSOP devices, the AD7683BRMZ has a pseudo-differential input while the AD7684BRMZRL7 has a true differential input. The input signal conditioning, reference configuration, and firmware timing must be validated against the AD7684BRMZRL7 datasheet before substitution.
What is the difference between the "BRMZ" and "BRMZRL7" suffixes?
The "BRMZ" suffix indicates a 10-lead MSOP package in a tube or standard reel quantity, while "BRMZRL7" indicates the same 10-lead MSOP package supplied on a 7-inch tape-and-reel. The electrical performance and die are identical within the same model; the suffix difference relates to packaging and shipping format, not device specifications.
What reference voltage do these ADCs require?
Both the AD7683BRMZ and AD7684BRMZRL7 use an external reference applied to the REF pin. The reference voltage sets the full-scale input range, and the devices support a reference range compatible with the 2.7 V to 5.5 V supply. The specific reference voltage range and reference input current should be verified from the respective manufacturer datasheets.