Part A
AD7685CRMZRL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4976 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 AD7685CRMZRL7 is a viable functional replacement candidate for the AD7680BRMZ, sharing the same 16-bit SAR architecture, 3-wire serial interface, and MSOP-8 footprint, though the higher throughput and wider supply range of the AD7685CRMZRL7 require validation against the system timing and power budget.
Resolution and Architecture
High match
Package Type
High match
Supply Voltage Range
Validation required
Sampling Rate
Validation required
Parts at a glance
Part B
AD7680BRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5939 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 | AD7680BRMZ | AD7685CRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is equivalent and not a differentiator for substitutability. |
| Sampling Rate (max) | 100 kSPS | 250 kSPS | The AD7685 supports a higher throughput, which matters if the application needs faster sampling than 100 kSPS. |
| Number of Input Channels | 1 (single-ended) | 1 (pseudo-differential) | Input configuration affects how the signal is referenced and whether common-mode rejection is available. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Both use a serial interface, so digital host compatibility is similar. |
| Supply Voltage (analog & digital) | 2.5 V to 5.5 V | 2.7 V to 5.5 V | The slightly wider low-end range of the AD7680 allows operation at 2.5 V, which may matter in low-voltage systems. |
| Package | 8-lead MSOP | 10-lead MSOP | Different pin counts and footprints mean the parts are not drop-in PCB replacements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean environmental suitability is the same. |
| Power Consumption (typical) | 3.5 mW at 3 V, 100 kSPS | 10 mW at 5 V, 250 kSPS | Power budget differs significantly; the AD7685 consumes more power at its higher throughput. |
| Reference Type | External reference | External reference | Both require an external reference, so reference design considerations are similar. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7685CRMZRL7 | AD7680BRMZ |
|---|---|---|
| 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 | 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 | 2.3V ~ 5.5V | 2.5V ~ 5.5V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 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 AD7685CRMZRL7?
The AD7680BRMZ is a 16-bit, 100 kSPS PulSAR ADC with a pseudo-differential input, SPI-compatible serial interface, and an internal 2.5 V reference, housed in a 10-lead MSOP. The AD7685CRMZRL7 is a 16-bit, 250 kSPS PulSAR ADC with a true differential input, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and an external reference requirement, supplied in a 10-lead MSOP and provided in tape-and-reel packaging. The primary differences are throughput (100 kSPS vs 250 kSPS), input configuration (pseudo-differential vs true differential), reference architecture (internal vs external), and packaging format.
Are the AD7680BRMZ and AD7685CRMZRL7 pin-compatible?
Both devices are offered in a 10-lead MSOP package, but pin functions differ between the two products. The AD7680 uses an internal reference and a pseudo-differential input structure, while the AD7685 requires an external reference and provides a true differential input. Designers must verify pin assignments against the respective manufacturer datasheets before considering any board-level substitution.
Can the AD7680BRMZ be used as a drop-in replacement for the AD7685CRMZRL7?
No. Although both are 16-bit PulSAR ADCs in 10-lead MSOP packages, they differ in input configuration (pseudo-differential vs true differential), reference architecture (internal vs external), and maximum throughput (100 kSPS vs 250 kSPS). A direct drop-in replacement is not supported without validating schematic, layout, and firmware changes against the manufacturer datasheets.
What are the maximum sampling rates of the AD7680BRMZ and AD7685CRMZRL7?
The AD7680BRMZ supports a maximum throughput of 100 kSPS. The AD7685CRMZRL7 supports a maximum throughput of 250 kSPS. The higher throughput of the AD7685 makes it suitable for faster signal acquisition applications, provided the system timing and external reference are properly designed.
How do the reference requirements differ between the AD7680BRMZ and AD7685CRMZRL7?
The AD7680BRMZ includes an internal 2.5 V reference, which simplifies the design by reducing external component count. The AD7685CRMZRL7 requires an external reference voltage to be supplied by the system, giving the designer flexibility in selecting the reference level and source but requiring additional board components and careful reference decoupling.
What input configurations do the AD7680BRMZ and AD7685CRMZRL7 support?
The AD7680BRMZ provides a pseudo-differential input, where the negative input is typically tied to a fixed potential and the positive input is measured relative to it. The AD7685CRMZRL7 provides a true differential input, allowing both inputs to swing independently, which improves common-mode rejection and is advantageous for differential signal sources.
What serial interface do the AD7680BRMZ and AD7685CRMZRL7 use?
Both devices use a serial interface compatible with SPI. The AD7680BRMZ provides an SPI-compatible serial interface, while the AD7685CRMZRL7 supports SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces. System designers should confirm timing and mode requirements against the respective datasheets when integrating either part.
What package and packaging options are available for these two ADCs?
Both the AD7680BRMZ and AD7685CRMZRL7 are supplied in a 10-lead MSOP package. The AD7685CRMZRL7 suffix indicates tape-and-reel packaging, which is suited to automated production lines. The AD7680BRMZ is typically supplied in standard tube or tray packaging; designers should confirm the exact ordering code and packaging format with the distributor or manufacturer before production planning.