Part A
AD7683BRMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5609 PCS
- Package
- MSOP-8
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7683BRMZ is a viable functional replacement candidate for the AD7683BRMZRL7, as both parts share the same core architecture, package, and electrical characteristics; the primary distinction is the delivery form, with the RL7 suffix denoting tape-and-reel packaging versus the tube format of the base part number. Designers should confirm reel quantity and packaging requirements against their assembly process before substituting.
Resolution and Architecture
High match
Package Type
High match
Supply Voltage and Interface
High match
Packaging and Ordering Format
Validation required
Parts at a glance
Part B
AD7685BRMZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4839 PCS
- Package
- MSOP-10
- Series
- Data Acquisition - 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 | AD7685BRMZRL7 | AD7683BRMZ | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate (max) | 250 kSPS | 100 kSPS | The AD7685 supports a higher throughput, which matters if the application requires faster sampling than 100 kSPS. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both are single-channel devices, so channel count does not affect interchangeability. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Identical serial interface simplifies drop-in replacement from a digital host perspective. |
| Supply Voltage (VDD) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Same supply range means both can operate from common 3 V or 5 V rails without redesign. |
| Analog Input Range | 0 V to VREF (unipolar) | 0 V to VREF (unipolar) | Matching unipolar input range ensures the same signal conditioning front-end can be reused. |
| Package | 10-lead MSOP (RM) | 8-lead MSOP (RM) | Different pin counts and footprints mean the PCB layout must be changed; they are not pin-compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range supports use in the same environmental conditions. |
| Power Consumption (typical) | ~3.5 mW at 5 V, 250 kSPS | ~1.8 mW at 5 V, 100 kSPS | Lower power per conversion in the AD7683 may matter for battery-powered or thermally constrained designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7683BRMZ | AD7685BRMZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 250k |
| 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 | 2.7V ~ 5.5V | 2.3V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7685BRMZRL7 and AD7683BRMZ?
The AD7685BRMZRL7 is a 16-bit, 250 kSPS PulSAR analog-to-digital converter, while the AD7683BRMZ is a 16-bit, 100 kSPS PulSAR ADC. 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 throughput rate and internal architecture.
Are the AD7685BRMZRL7 and AD7683BRMZ pin-compatible?
Both devices are supplied in the same 10-lead MSOP (RM) package, but pin functions and timing interfaces differ between the two product families. Designers should verify the pin configuration and digital interface timing against the respective manufacturer datasheets before considering a layout-compatible substitution.
What is the maximum sampling rate of each device?
The AD7685BRMZRL7 supports a maximum throughput of 250 kSPS. The AD7683BRMZ supports a maximum throughput of 100 kSPS. The higher sampling rate of the AD7685 makes it suitable for faster signal acquisition applications.
Do both ADCs use the same digital interface?
Both devices provide a serial digital output, but their interface timing and readback behavior differ. The AD7685 uses a CS- and clock-driven serial interface compatible with SPI/QSPI/MICROWIRE/DSP, while the AD7683 uses a similar serial interface with different timing requirements. Interface timing must be validated against each datasheet.
What is the resolution and typical SNR of these ADCs?
Both the AD7685BRMZRL7 and AD7683BRMZ are 16-bit successive-approximation ADCs. The AD7685 achieves a typical SNR of approximately 93.5 dB, while the AD7683 achieves a typical SNR of approximately 92 dB, according to manufacturer datasheet specifications.
Can the AD7683BRMZ be used as a drop-in replacement for the AD7685BRMZRL7?
No. Although both are 16-bit ADCs in a 10-lead MSOP package, they differ in maximum throughput (250 kSPS vs 100 kSPS), interface timing, and internal architecture. A drop-in replacement requires verification of pin functions, timing, and performance against the target design requirements.
What are the power supply and reference requirements for these devices?
Both devices operate from a single 2.7 V to 5.5 V supply and use an external reference voltage. The reference input range and supply decoupling requirements should be confirmed from the respective manufacturer datasheets, as the internal reference architecture and allowable reference values may differ between the two parts.