Part A
ADS7887SDCKR
德州儀器
- Lifecycle
- Active
- Stock
- 2563 件
- Package
- SOT-SC70-6
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7868IDBVR and ADS7887SDCKR are both 8-bit, single-channel SAR ADCs with SPI-compatible serial interfaces, making them functionally comparable for many low-resolution sampling applications. However, they differ in package footprint (SOT-23-6 vs SC-70-6), maximum sampling rate, and supply voltage range, so board-level validation is required before substituting one for the other in an existing design.
Resolution and Architecture
High match
Package Type
Validation required
Sampling Rate
Validation required
Supply Voltage Range
Validation required
Parts at a glance
Part B
ADS7868IDBVR
德州儀器
- Lifecycle
- Active
- Stock
- 5174 件
- Package
- SOT-23-6
- Series
- 資料獲取-模數轉換器（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 | ADS7868IDBVR | ADS7887SDCKR | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 10 bit | Higher resolution provides finer quantization of the analog input, directly affecting measurement accuracy and dynamic range. |
| Sampling Rate | 1 MSPS | 1.25 MSPS | Maximum throughput determines how fast the ADC can digitize signals; a higher rate supports wider-bandwidth inputs. |
| Number of Input Channels | 1 single-ended | 1 single-ended | Channel count and configuration define how many signals can be measured and whether differential or single-ended wiring is required. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.35 V to 5.5 V | The supply range must match the system rail; a wider low-end range allows operation from lower-voltage supplies. |
| Interface Type | SPI (serial) | SPI (serial) | The digital interface must be compatible with the host controller for direct communication without glue logic. |
| Package / Case | SOT-23-6 | SC-70-6 | Package footprint and pinout must match the PCB layout for a drop-in replacement; different packages require layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The temperature range must cover the application environment; a wider range offers margin in harsh conditions. |
| Input Type | Single-ended, unipolar | Single-ended, unipolar | Input configuration determines signal conditioning needs and whether the ADC can directly accept the sensor output. |
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 | ADS7887SDCKR | ADS7868IDBVR |
|---|---|---|
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Active |
| Number of Bits | 10 | 8 |
| Sampling Rate(Per Second) | 1.25M | 280k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| 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 | Supply | Supply |
| Voltage - Supply, Analog | 2.35V ~ 5.25V | 1.2V ~ 3.6V |
| Voltage - Supply, Digital | 2.35V ~ 5.25V | 1.2V ~ 3.6V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS7868IDBVR and ADS7887SDCKR?
The ADS7868IDBVR is a 12-bit, 1-MSPS SAR ADC in a SOT-23-6 package, while the ADS7887SDCKR is a 10-bit, 1.25-MSPS SAR ADC in an SC-70-6 package. The ADS7868 offers higher resolution, whereas the ADS7887 provides a slightly higher sampling rate and a smaller package footprint.
Are the ADS7868IDBVR and ADS7887SDCKR pin-compatible?
No. The ADS7868IDBVR uses a 6-pin SOT-23 (DBV) package, and the ADS7887SDCKR uses a 6-pin SC-70 (DCK) package. Although both are 6-pin packages, the package outlines and PCB land patterns differ, so they are not drop-in replacements without layout changes.
What is the resolution and sampling rate of each device?
The ADS7868IDBVR provides 12-bit resolution at a maximum throughput of 1 MSPS. The ADS7887SDCKR provides 10-bit resolution at a maximum throughput of 1.25 MSPS. Selection depends on whether higher accuracy or higher sample rate is prioritized.
Do both ADCs use the same analog input configuration?
Both devices are single-channel, unipolar SAR ADCs with a pseudo-differential input structure referenced to a supplied reference voltage. Designers should confirm the exact input voltage range and reference requirements from the respective datasheets, as the full-scale input is set by the applied reference on both parts.
What supply voltage do the ADS7868IDBVR and ADS7887SDCKR require?
Both devices operate from a single analog supply in the 2.7 V to 5.25 V range, with a separate digital I/O supply pin (VIO) that allows interfacing to lower-voltage logic. This makes both parts suitable for mixed-supply systems.
What serial interface do these ADCs use?
Both the ADS7868IDBVR and ADS7887SDCKR use a SPI-compatible serial interface with a chip-select, serial clock, and serial data output. This allows direct connection to most microcontrollers and DSPs without external glue logic.
Can the ADS7887SDCKR be used as a substitute for the ADS7868IDBVR in an existing design?
Not directly. Substitution requires verifying resolution (10-bit vs 12-bit), package footprint (SC-70 vs SOT-23), and PCB land pattern compatibility. The lower resolution of the ADS7887SDCKR may also affect system accuracy, so the design must be revalidated against the application's error budget.
Which device is better suited for space-constrained designs?
The ADS7887SDCKR in the SC-70 (DCK) package occupies a smaller board area than the ADS7868IDBVR in the SOT-23 (DBV) package. For layouts where footprint is the primary constraint, the SC-70 option is preferable, provided the 10-bit resolution meets the accuracy requirement.