Part A
AD7685CRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5270 個数
- Package
- MSOP-10
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7685CRMZ is a viable functional replacement candidate for the AD7683BRMZRL7 in many precision ADC applications, sharing a 16-bit SAR architecture and a compatible MSOP-10 footprint. However, designers must validate the differing serial interface timing, throughput rate, and analog input configuration before committing to a drop-in substitution.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Digital Interface
Validation required
Parts at a glance
Part B
AD7683BRMZRL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6941 個数
- Package
- MSOP-8
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7685CRMZ | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is equivalent and does not differentiate substitutability. |
| Sampling Rate (max) | 100 kSPS | 250 kSPS | The AD7685 supports a higher throughput, which matters for faster signal acquisition and higher-bandwidth applications. |
| Input Type | Pseudo-differential, single-ended | Differential | Differential input offers better common-mode rejection and noise immunity, affecting suitability for noisy or precision measurement environments. |
| Number of Input Channels | 1 | 1 | Both are single-channel devices, so channel count is not a differentiator for substitutability. |
| Interface | SPI / DSP-compatible serial | SPI / QSPI / MICROWIRE / DSP-compatible serial | Broader serial interface compatibility on the AD7685 eases integration with a wider range of host controllers. |
| Supply Voltage (analog) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical analog supply range means both fit the same power rail designs. |
| Package | 10-lead MSOP | 10-lead MSOP | Same package footprint allows drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings mean both suit the same industrial operating environments. |
| Power Consumption (typical) | 4 mW at 5 V, 100 kSPS | 10 mW at 5 V, 250 kSPS | Lower power per conversion on the AD7683 benefits battery-powered or thermally constrained designs, while the AD7685 trades power for speed. |
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 | AD7685CRMZ | AD7683BRMZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 100k |
| 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 | 2.3V ~ 5.5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.3V ~ 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 the AD7685CRMZ?
The AD7683BRMZRL7 is a 16-bit, 100 kSPS PulSAR analog-to-digital converter with a pseudo-differential input, while the AD7685CRMZ is a 16-bit, 250 kSPS PulSAR ADC with a true differential input. The AD7685CRMZ offers a higher throughput rate and differential input architecture, whereas the AD7683BRMZRL7 provides a pseudo-differential input and lower power consumption at a reduced sample rate.
Are the AD7683BRMZRL7 and AD7685CRMZ pin-compatible?
No. Both devices are offered in a 10-lead MSOP package, but the AD7683BRMZRL7 uses a pseudo-differential input configuration and the AD7685CRMZ uses a true differential input configuration, so the analog input pin functions and external signal conditioning requirements differ. A direct drop-in replacement should not be assumed without verifying the pin functions and input architecture against the respective datasheets.
What is the maximum sample rate of each device?
The AD7683BRMZRL7 supports a maximum throughput of 100 kSPS. The AD7685CRMZ supports a maximum throughput of 250 kSPS.
What is the resolution and architecture of these ADCs?
Both the AD7683BRMZRL7 and the AD7685CRMZ are 16-bit successive-approximation register (SAR) analog-to-digital converters based on the PulSAR architecture, providing no missing codes at 16-bit resolution.
How do the analog input configurations differ?
The AD7683BRMZRL7 has a pseudo-differential analog input, where the negative input is typically tied to a fixed reference or ground potential. The AD7685CRMZ has a true differential analog input, allowing the converter to measure the difference between two actively driven inputs, which improves common-mode rejection and dynamic performance in many applications.
What are the supply voltage and interface requirements for these devices?
Both devices operate from a single 2.7 V to 5.5 V supply for the analog and digital sections and use a serial SPI-compatible interface for data output. The AD7685CRMZ additionally supports a separate VIO supply pin for digital interface flexibility, while the AD7683BRMZRL7 integrates the digital interface supply with the main supply.
Can the AD7685CRMZ be used as a replacement for the AD7683BRMZRL7 in an existing design?
Not directly. Although both are 16-bit PulSAR ADCs in 10-lead MSOP packages, the AD7685CRMZ has a higher maximum sample rate (250 kSPS vs 100 kSPS) and a true differential input versus the pseudo-differential input of the AD7683BRMZRL7. The digital interface timing, input drive requirements, and PCB layout may need to be revalidated against the AD7685CRMZ datasheet before substitution.
What are the typical applications for each converter?
The AD7683BRMZRL7 is suited to lower-speed, low-power precision measurement applications such as battery-powered instruments and portable data acquisition. The AD7685CRMZ, with its higher throughput and true differential input, is suited to higher-speed precision applications such as medical instrumentation, industrial process control, and vibration or signal analysis where common-mode rejection and dynamic range are important.