Part A
AD7685ARMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5296 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 AD7685ARMZ and AD7680ARM-REEL share the same 16-bit SAR ADC architecture, MSOP-10 package, and 2.7 V to 5.5 V supply range, making them functionally comparable in many designs. However, the AD7685ARMZ offers a higher 250 kSPS throughput versus 100 kSPS on the AD7680ARM-REEL, and the two devices differ in their serial interface timing and reference configuration. Designers should validate SPI timing, reference drive, and sampling rate requirements before substituting one for the other in production.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Serial Interface Timing
Validation required
Parts at a glance
Part B
AD7680ARM-REEL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2486 個数
- Package
- TSSOP-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 | AD7685ARMZ | AD7680ARM-REEL | 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 | 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 is not a differentiator. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Identical serial interface compatibility means either part can drop into the same digital bus design. |
| Supply Voltage (Analog & Digital) | 2.7 V to 5.5 V | 2.5 V to 5.5 V | The AD7680 supports a slightly lower minimum supply, which can matter in low-voltage systems operating near 2.5 V. |
| Power Consumption | ~4 mW at 5 V, 250 kSPS | ~3.5 mW at 5 V, 100 kSPS | Lower power per conversion can be important in portable or power-sensitive designs. |
| Package | 10-lead MSOP | 8-lead MSOP | Different pin counts and footprints mean the PCB layout must be redesigned; 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 temperature environments. |
| Reference Type | External reference | External reference | Both require an external reference, so the reference design approach is the same for either part. |
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 | AD7685ARMZ | AD7680ARM-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| 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 AD7685ARMZ and AD7680ARM-REEL?
The AD7685ARMZ is a 16-bit, 250 kSPS PulSAR analog-to-digital converter, while the AD7680ARM-REEL is a 16-bit, 100 kSPS PulSAR ADC. Both are offered in a 10-lead MSOP package, but they differ in throughput rate, power consumption, and serial interface timing characteristics.
Are the AD7685ARMZ and AD7680ARM-REEL pin-compatible?
Both devices are specified in a 10-lead MSOP (RM) package with the same pin count. However, designers must verify the pin function assignments against the respective manufacturer datasheets before considering any layout reuse, since the internal configuration and interface timing may differ.
What is the maximum sampling rate of each device?
The AD7685ARMZ supports a throughput rate of up to 250 kSPS, whereas the AD7680ARM-REEL supports up to 100 kSPS. The higher throughput of the AD7685ARMZ makes it suitable for faster acquisition systems, while the AD7680ARM-REEL targets lower-speed, lower-power applications.
Do both ADCs use the same serial interface?
Both devices provide a serial digital output compatible with SPI/QSPI/MICROWIRE/DSP interfaces. However, the timing parameters, such as conversion time and acquisition time, differ between the two parts, so firmware and clock timing must be validated against the specific datasheet for each device.
How do the power consumption figures compare?
The AD7685ARMZ and AD7680ARM-REEL both operate from a single 2.7 V to 5.5 V supply. Because the AD7685ARMZ runs at a higher throughput, its power consumption at full rate is generally higher than that of the AD7680ARM-REEL. Exact supply current and power figures should be taken from the respective manufacturer datasheets.
Can the AD7680ARM-REEL be used as a drop-in replacement for the AD7685ARMZ?
It is not a direct drop-in replacement. Although both are 16-bit ADCs in a 10-lead MSOP package, the lower 100 kSPS throughput of the AD7680ARM-REEL may not meet system requirements designed around the 250 kSPS AD7685ARMZ. Interface timing and performance specifications must be revalidated before substitution.
What are the package and ordering differences between the two part numbers?
The AD7685ARMZ is supplied in a 10-lead MSOP package in tube or standard reel quantities, while the AD7680ARM-REEL is specifically ordered in reel packaging. The "REEL" suffix indicates tape-and-reel delivery format, which is relevant for automated assembly lines rather than a change in the device itself.
Which device is better suited for low-power portable applications?
The AD7680ARM-REEL, with its lower 100 kSPS throughput, is generally better suited to low-power portable applications where reduced sampling rate and lower power consumption are acceptable. The AD7685ARMZ is preferable when higher throughput is required and the associated power budget can be accommodated.