Part A
AD7683ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4105 PCS
- Package
- MSOP-8
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7683ARMZ is a viable functional replacement candidate for the AD7685ARMZRL7, sharing the same 16-bit SAR architecture, MSOP-8 footprint, and 100 kSPS throughput class, though the two devices differ in analog input configuration and serial interface timing, so validation of the input drive and digital timing is required before substitution.
Resolution and Architecture
High match
Package and Pinout
High match
Analog Input Configuration
Validation required
Serial Interface Timing
Validation required
Parts at a glance
Part B
AD7685ARMZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1265 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 | AD7685ARMZRL7 | AD7683ARMZ | 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. |
| Input Type | Pseudo-differential (single-ended) | Differential | Input configuration affects signal conditioning and whether the part can directly interface with differential or single-ended sources. |
| Number of Input Channels | 1 | 1 | Both are single-channel devices, so channel count is not a differentiator. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Identical serial interface compatibility means either part can drop into the same digital host interface. |
| Supply Voltage (Analog & Digital) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges allow both parts to operate from the same rails without redesign. |
| Package | 10-lead MSOP (RMZ) | 8-lead MSOP (RMZ) | Different pin counts and footprints mean the PCB layout must be changed; they are not drop-in package-compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial operating environments. |
| Power Consumption (typical) | 3.5 mW at 5 V, 250 kSPS | 4.5 mW at 5 V, 100 kSPS | Power budget differences affect thermal design and battery life in portable or low-power systems. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7683ARMZ | AD7685ARMZRL7 |
|---|---|---|
| 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 AD7685ARMZRL7 and the AD7683ARMZ?
The AD7685ARMZRL7 is a 16-bit, 250 kSPS PulSAR analog-to-digital converter, while the AD7683ARMZ 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 digital interface timing characteristics.
Are the AD7685ARMZRL7 and AD7683ARMZ pin-compatible?
Yes. Both devices are specified in the same 10-lead MSOP (RM) package and share a compatible pinout, including VDD, VIO, GND, REF, IN+, IN-, and the serial interface pins (SDI, SDO, SCK, CNV). This allows a common PCB footprint, though firmware timing must be validated for the different throughput rates.
What is the maximum sampling rate of each device?
The AD7685ARMZRL7 supports a maximum throughput of 250 kSPS. The AD7683ARMZ supports a maximum throughput of 100 kSPS. Designs requiring higher sample rates should use the AD7685ARMZRL7, provided the digital host can accommodate the faster serial clock and conversion timing.
Do both ADCs use the same serial interface?
Both devices provide a SPI/QSPI/MICROWIRE/DSP-compatible serial interface with a 3-wire or 4-wire configuration (SDI, SDO, SCK, CNV). The AD7685ARMZRL7 supports a faster SCK rate to accommodate its 250 kSPS throughput, so the host SPI clock and CS/CNV timing must be verified against each datasheet when swapping devices.
What is the resolution and typical SNR of these ADCs?
Both the AD7685ARMZRL7 and AD7683ARMZ are 16-bit successive-approximation (SAR) ADCs. Per the respective manufacturer datasheets, both achieve approximately 92 dB SNR typical for a 16-bit PulSAR device, making them suitable for high-accuracy precision measurement applications.
Can the AD7683ARMZ be used as a drop-in replacement for the AD7685ARMZRL7?
Pin compatibility allows a common footprint, but a drop-in replacement requires validating the digital timing: the AD7683ARMZ has a lower maximum throughput (100 kSPS vs. 250 kSPS) and different SCK/CNV timing. The system firmware and host SPI configuration must be re-verified against the AD7683ARMZ datasheet before substitution.
What supply and reference voltages do these ADCs require?
Both devices operate from a single 2.7 V to 5.5 V VDD supply, with a separate VIO supply for the digital interface. The external reference (REF) sets the full-scale input range; per the datasheets, REF can range from 0.5 V to VDD, allowing flexible input span configuration for both the AD7685ARMZRL7 and AD7683ARMZ.
What are the typical applications for these 16-bit PulSAR ADCs?
Both the AD7685ARMZRL7 and AD7683ARMZ are suited to precision data acquisition, industrial process control, medical instrumentation, and battery-powered portable equipment. The AD7685ARMZRL7 is preferred where higher throughput (250 kSPS) is needed, while the AD7683ARMZ suits lower-rate, lower-power measurement channels.