MCP3008-I/P: 10-Bit 8-Channel ADC with SPI Interface

ElecSuppliers Part Number GuideAug 20, 2026

The MCP3008-I/P is an 8-channel, 10-bit analog-to-digital converter from Microchip Technology. It uses a successive approximation register architecture and communicates with a host controller through a standard SPI-compatible serial interface.

The device is designed for applications that need to acquire multiple analog signals while using a relatively small number of digital interface connections. The MCP3008-I/P specifically uses a PDIP package and industrial temperature grade.

What Is the MCP3008-I/P?

The MCP3008-I/P converts analog input signals into 10-bit digital values that can be processed by a microcontroller, processor or other digital controller.

It provides eight single-ended analog input channels. The input structure also supports pseudo-differential measurements, giving designers additional flexibility when connecting analog sources.

Because the ADC uses SPI rather than a parallel data bus, only a small number of controller pins are required for communication.

This makes the MCP3008-I/P useful when a system needs several analog inputs but the main controller does not provide enough integrated ADC channels.

MCP3008-I/P 10-Bit ADC Resolution

The MCP3008-I/P provides 10-bit conversion resolution, resulting in 1,024 possible digital output codes across the selected input range.

The actual voltage represented by each ADC code depends on the reference voltage used by the converter. A lower reference voltage produces a smaller voltage step for each code, while a higher reference voltage provides a wider measurable range.

For this reason, reference selection should be considered together with the expected analog input range when designing a measurement system.

Resolution alone does not determine overall measurement accuracy. Input noise, reference stability, offset, gain error and PCB design can all influence the final result.

MCP3008-I/P Eight Analog Channels

The eight input channels are one of the main reasons to select the MCP3008-I/P.

A single ADC can sequentially measure several independent analog signals instead of requiring a separate converter for each sensor.

For example, a controller could use one MCP3008-I/P to monitor several voltage outputs, potentiometers, temperature sensors or other analog sources.

The channels are selected through the serial control sequence, allowing the host controller to determine which input is converted.

MCP3008-I/P SPI Interface

The MCP3008-I/P communicates through a four-wire SPI-compatible interface.

The serial interface transfers the channel-selection information to the ADC and returns the resulting conversion data to the host controller.

SPI is widely supported by microcontrollers, processors and development platforms, making the MCP3008-I/P relatively straightforward to integrate into embedded systems.

Compared with a parallel ADC interface, SPI also reduces the number of PCB traces and controller GPIO connections required for digital communication.

MCP3008-I/P 200 kSPS Sampling Rate

The MCP3008 family supports conversion rates up to 200 kSPS under specified operating conditions.

This sampling capability provides enough performance for many sensor and embedded measurement applications while retaining a relatively simple ADC architecture.

The required sampling rate depends on the signal being measured. Slowly changing signals such as temperature do not normally require the maximum conversion rate, while faster-changing signals may require more careful evaluation of sampling frequency, source impedance and signal conditioning.

When switching between channels, the application should also account for the settling behavior of the analog signal before using the conversion result.

MCP3008-I/P Input Configuration

The MCP3008-I/P supports eight single-ended channels and pseudo-differential input configurations.

Single-ended operation is convenient when each analog source is referenced to a common system ground.

Pseudo-differential operation can be useful when the measurement needs to be made relative to another input rather than directly against the system reference.

The selected configuration should match the sensor output and grounding architecture of the system.

MCP3008-I/P Power Supply

The MCP3008 family is designed for operation from a supply range beginning at 2.7V and extending to 5.5V.

This allows the ADC to be integrated into embedded systems using common low-voltage digital supplies.

The analog input range and reference voltage should be considered together with the supply voltage. The input signal should remain within the electrical limits specified for the ADC.

For systems operating at lower supply voltages, engineers should also verify SPI logic-level compatibility between the MCP3008-I/P and the host controller.

MCP3008-I/P Low-Power Operation

Low power consumption can be useful in battery-operated data acquisition equipment.

The MCP3008-I/P uses a low-power SAR architecture and can enter a standby state when it is not actively converting.

In a system that only needs periodic measurements, the controller can perform conversions when required rather than continuously operating the ADC. This can help reduce the overall energy consumption of the measurement subsystem.

The final system power budget should also include the host controller, sensors, reference circuitry and other components connected to the ADC.

MCP3008-I/P Applications

The MCP3008-I/P can be used in systems that require multiple analog inputs and SPI-based digital communication.

Typical applications include data acquisition, instrumentation, measurement equipment, industrial control, robotics, motor control, smart sensors and embedded monitoring systems.

Its eight-channel architecture can be particularly useful when a microcontroller needs to monitor several analog signals without moving to a larger processor solely to obtain additional ADC inputs.

MCP3008-I/P Analog Signal Design

The quality of the conversion depends heavily on the analog signal presented to the ADC.

High source impedance can affect ADC acquisition because the internal sampling system needs to charge its input circuitry during conversion. If the signal source cannot provide sufficient drive, a buffer amplifier or appropriate RC network may be required.

External filtering can also be used when the measured signal contains unwanted high-frequency noise.

For precision measurements, the reference voltage should be stable and the PCB layout should separate sensitive analog paths from noisy digital or switching circuits where practical.

MCP3008-I/P Package and Temperature Grade

The complete MCP3008-I/P Part Number identifies an industrial-temperature PDIP configuration.

The I designation corresponds to the industrial temperature range, while /P identifies the plastic PDIP package.

This distinction is important when sourcing or replacing the device. Another MCP3008 ordering code may use a different package or temperature grade and therefore should not automatically be treated as an identical component.

For an existing PCB, the PDIP package and pin configuration should be checked before considering an alternative ordering variant.

MCP3008-I/P Design Considerations

When designing around the MCP3008-I/P, engineers should consider more than the nominal 10-bit resolution and eight-channel count.

The reference voltage determines the conversion scale, while the source impedance and input filtering affect acquisition performance. The sampling rate should match the signal bandwidth, and channel switching should allow sufficient settling time where required.

The SPI timing configuration should also be checked against the host controller to ensure reliable communication.

For multi-channel measurement systems, firmware should clearly associate each ADC conversion with its selected input channel to prevent incorrect sensor readings.

Choosing the MCP3008-I/P

The MCP3008-I/P is a practical option when an embedded system needs eight analog inputs, 10-bit conversion and SPI communication in a through-hole PDIP package.

Its combination of eight channels, 200 kSPS conversion capability, SAR architecture and low-power operation makes it suitable for a variety of embedded measurement and control systems.

For a new design, engineers should evaluate the required resolution, input range, reference voltage, sampling rate, source impedance, SPI compatibility and package requirements before selecting the MCP3008-I/P.

For existing hardware, the complete MCP3008-I/P ordering code should be used when identifying the component, since the package and temperature-grade suffixes are part of the specific device configuration.