Part A
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）
Replacement verdict
Compatible functional replacement candidate
The ADS7868IDBVR and ADS7887MDBVT are both 8-bit, single-channel SAR ADCs with SPI-compatible serial interfaces, making them functionally comparable for many low-resolution sampling applications. However, the ADS7887MDBVT offers a higher sampling rate and a wider supply range, while the ADS7868IDBVR operates at a lower supply voltage with a smaller package. Designers should validate timing, reference, and layout requirements before substituting one for the other in an existing design.
Resolution
High match
Interface Type
High match
Supply Voltage
Validation required
Package Type
Validation required
Parts at a glance
Part B
ADS7887MDBVT
德州儀器
- Lifecycle
- Active
- Stock
- 9951 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 | ADS7887MDBVT | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 10 bit | Resolution determines the smallest analog voltage change the ADC can distinguish; a 10-bit part offers four times finer quantization than an 8-bit part, affecting measurement accuracy. |
| Sampling Rate | 200 kSPS | 1 MSPS | Maximum throughput limits how fast the system can acquire signals; the higher-rate device supports faster control loops and higher-bandwidth inputs. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Channel count defines how many analog signals can be digitized; both are single-channel, so multiplexing is required for multi-signal systems. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.35 V to 5.5 V | The supply range determines compatibility with the system rail; the wider low-end range of the ADS7887 allows operation from lower-voltage rails. |
| Interface Type | SPI (serial) | SPI (serial) | The digital interface must match the host controller; both use SPI, simplifying drop-in replacement at the protocol level. |
| Package | SOT-23-6 | SOT-23-6 | Package footprint and pinout must be compatible for board-level substitution; identical SOT-23-6 packages ease physical replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | Temperature range affects suitability for harsh environments; the extended range of the ADS7887 supports higher-temperature applications. |
| Input Type | Single-ended, unipolar | Single-ended, unipolar | Input configuration determines signal conditioning needs; both accept unipolar single-ended inputs, so front-end circuitry can remain similar. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7868IDBVR | ADS7887MDBVT |
|---|---|---|
| Supplier | - | Texas Instruments |
| Series | microPOWER™ | microPOWER™ |
| Part Status | Active | Obsolete |
| Number of Bits | 8 | 10 |
| Sampling Rate(Per Second) | 280k | 1.25M |
| 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 | 1.2V ~ 3.6V | 2.35V ~ 5.25V |
| Voltage - Supply, Digital | 1.2V ~ 3.6V | 2.35V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -55°C ~ 125°C |
Frequently asked questions
What are the key differences between the ADS7868IDBVR and ADS7887MDBVT?
The ADS7868IDBVR is a 12-bit, 1-MSPS SAR ADC in a SOT-23-6 package, while the ADS7887MDBVT is a 10-bit, 1.25-MSPS SAR ADC in a SOT-23-6 package. The ADS7868 offers higher resolution (12-bit vs 10-bit), whereas the ADS7887 provides a slightly higher throughput rate (1.25 MSPS vs 1 MSPS). Both are single-channel, unipolar, serial-interface ADCs from Texas Instruments.
Are the ADS7868IDBVR and ADS7887MDBVT pin-compatible?
Yes. Both devices are offered in the same 6-pin SOT-23 (DBV) package and share the same pinout: VDD, GND, VIN, CS, SCLK, and SDO. This allows them to be used on the same PCB land pattern, though firmware and timing must be adjusted for the different resolution and throughput.
What is the resolution and sampling rate of each device?
The ADS7868IDBVR provides 12-bit resolution with a maximum sampling rate of 1 MSPS. The ADS7887MDBVT provides 10-bit resolution with a maximum sampling rate of 1.25 MSPS. Both are successive-approximation register (SAR) ADCs with a serial SPI-compatible interface.
What is the supply voltage range for the ADS7868IDBVR and ADS7887MDBVT?
Both devices operate from a single analog supply of 2.7 V to 5.25 V. The digital interface (SCLK, SDO, CS) is compatible with the same supply rail, and both parts support a unipolar input range of 0 V to VDD.
Can the ADS7887MDBVT directly replace the ADS7868IDBVR in an existing design?
Pin-compatible replacement is possible, but not a drop-in functional replacement. The ADS7887 has 10-bit resolution versus 12-bit, a different throughput (1.25 MSPS vs 1 MSPS), and different serial timing and output data format. Firmware, timing, and system accuracy budgets must be revalidated before substitution.
What are the operating temperature ranges for these ADCs?
Both the ADS7868IDBVR and ADS7887MDBVT are specified for the industrial temperature range of -40°C to +85°C, making them suitable for industrial and embedded applications.
What interface do the ADS7868IDBVR and ADS7887MDBVT use?
Both devices use a serial SPI-compatible interface with chip select (CS), serial clock (SCLK), and serial data output (SDO). This allows connection to most microcontrollers and DSPs with minimal pin count.
Which device is better for higher-accuracy applications?
The ADS7868IDBVR is better suited for higher-accuracy applications because it provides 12-bit resolution compared to the 10-bit resolution of the ADS7887MDBVT. The ADS7887 is better suited for applications requiring slightly higher throughput (1.25 MSPS) where 10-bit resolution is sufficient.