Part A
AD7686CRMZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 3822 PCS
- Package
- MSOP-10
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7686CRMZ is a strong functional replacement candidate for the AD7680BRMZ, sharing the same 16-bit SAR architecture, 3-wire SPI interface, and MSOP-8 footprint. Designers should validate the higher throughput requirement and confirm the tighter INL specification meets the target application before final qualification.
Resolution and Architecture
High match
Package and Pinout
High match
Sampling Rate
Validation required
INL and Accuracy
Validation required
Parts at a glance
Part B
AD7680BRMZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 5939 PCS
- Package
- MSOP-8
- Series
- 데이터 수집 - 아날로그 변환기(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 | AD7680BRMZ | AD7686CRMZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is equivalent and not a differentiator for substitutability. |
| Sampling Rate | 100 kSPS | 500 kSPS | The AD7686 supports a much higher throughput, which matters for faster signal acquisition and higher-bandwidth applications. |
| Number of Input Channels | 1 (single-ended) | 1 (pseudo-differential) | Input configuration affects how the signal is referenced and the achievable noise/ground rejection in the system. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Both use a compatible serial interface, so digital host connectivity is essentially interchangeable. |
| Supply Voltage | 2.5 V to 5.5 V | 4.5 V to 5.5 V | The AD7680 operates over a wider low-voltage range, while the AD7686 requires a 5 V supply, affecting system power design. |
| Analog Input Range | 0 V to VREF (unipolar) | 0 V to VREF (unipolar, pseudo-differential) | Input range determines the measurable signal span and how the sensor/front-end must be scaled. |
| Package | 8-lead MSOP | 10-lead MSOP | Different package pin counts and footprints affect PCB layout and drop-in compatibility. |
| 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 | Typically ~3.5 mW at 5 V, 100 kSPS | Typically ~15 mW at 5 V, 500 kSPS | Power draw influences thermal design and suitability for low-power or battery-operated systems. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7686CRMZ | AD7680BRMZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 500k | 100k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential | Single Ended |
| 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 | Supply |
| Voltage - Supply, Analog | 5V | 2.5V ~ 5.5V |
| Voltage - Supply, Digital | 5V | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7680BRMZ and AD7686CRMZ?
The AD7680BRMZ is a 16-bit, 100 kSPS successive-approximation ADC with a pseudo-differential input, while the AD7686CRMZ is a 16-bit, 500 kSPS charge-redistribution ADC with a pseudo-differential input. The AD7686CRMZ offers a higher throughput rate (500 kSPS vs 100 kSPS) and is specified for operation from a 5 V supply, whereas the AD7680BRMZ operates from a 2.7 V to 5.25 V supply. Both are available in a 10-lead MSOP package.
Are the AD7680BRMZ and AD7686CRMZ pin-compatible?
Yes, both devices are offered in a 10-lead MSOP (RM) package with the same pinout, allowing them to share a common PCB footprint. However, pin compatibility does not guarantee functional interchangeability; the surrounding circuit, reference, and digital interface timing must be validated for the selected device.
What is the maximum sampling rate of each device?
The AD7680BRMZ has a maximum throughput of 100 kSPS. The AD7686CRMZ has a maximum throughput of 500 kSPS. The higher rate of the AD7686CRMZ makes it suitable for faster signal acquisition applications.
What supply voltage ranges do the AD7680BRMZ and AD7686CRMZ support?
The AD7680BRMZ operates from a single supply of 2.7 V to 5.25 V. The AD7686CRMZ is specified for a 5 V supply. Designs migrating between the two should verify that the system supply and reference levels meet the requirements of the target device.
Do both ADCs use the same digital interface?
Both devices provide a serial SPI-compatible interface for connection to microcontrollers and DSPs. However, the interface timing, conversion time, and acquisition time differ because of the different throughput rates, so firmware and timing parameters must be reviewed when substituting one device for the other.
What input configuration do the AD7680BRMZ and AD7686CRMZ use?
Both ADCs feature a pseudo-differential input structure, allowing the negative input to be driven by a small signal or tied to a reference point while the positive input is converted. This configuration supports rejection of common-mode signals within the specified input range.
Can the AD7680BRMZ be replaced by the AD7686CRMZ in an existing design?
A direct replacement requires validation of several factors: the higher 500 kSPS throughput of the AD7686CRMZ, its 5 V supply requirement, and the associated digital interface timing. The shared 10-lead MSOP footprint simplifies layout, but the system power, reference, and firmware must be confirmed against the AD7686CRMZ datasheet before substitution.