MCP3008 and ADS1115 are popular analog-to-digital converters used in embedded systems, sensor interfaces, data acquisition equipment, robotics, industrial control, and measurement applications.
Although both devices convert analog signals into digital data, they are designed with different architectures and performance priorities. MCP3008 is a 10-bit SAR ADC with eight single-ended channels and an SPI interface, while ADS1115 is a 16-bit delta-sigma ADC with four single-ended or two differential input channels and an I2C interface.
For engineers comparing MCP3008 vs ADS1115, the main considerations include resolution, channel count, sampling rate, interface, input configuration, supply voltage, programmable gain, and the requirements of the target application.
MCP3008 is a 10-bit analog-to-digital converter from Microchip designed for embedded control and data acquisition applications.
The device provides eight single-ended analog input channels or four pseudo-differential input pairs. It uses a successive approximation register architecture and communicates with the host controller through an SPI-compatible serial interface.
The MCP3008 supports conversion rates of up to 200 ksps at a 5V supply and operates from a supply range of 2.7V to 5.5V. It is available in 16-pin PDIP and SOIC packages.
Typical applications include sensor interfaces, process control, data acquisition, battery-powered systems, robotics, motor control, industrial automation, and measurement equipment.
ADS1115 is a 16-bit delta-sigma ADC from Texas Instruments designed for precision analog measurements.
The device provides four single-ended inputs or two differential inputs through an internal multiplexer. It uses an I2C interface and integrates a programmable gain amplifier, internal voltage reference, oscillator, and digital comparator.
ADS1115 supports programmable data rates from 8 SPS to 860 SPS and operates from a 2.0V to 5.5V supply. TI specifies an operating temperature range of -40°C to +125°C.
The integrated PGA provides selectable input ranges from ±256mV to ±6.144V, making ADS1115 suitable for measuring relatively small analog signals as well as larger input ranges within the device's limitations.
Resolution is one of the biggest differences between the two ADCs.
MCP3008 provides 10-bit resolution. This results in 1,024 possible digital codes across the ADC's conversion range.
ADS1115 provides 16-bit resolution, giving a much finer nominal digital representation of the input signal.
This makes ADS1115 more appropriate when the application requires higher measurement resolution.
However, higher nominal resolution does not automatically mean that ADS1115 is the better choice for every application. ADC selection also depends on noise, signal bandwidth, sampling requirements, input range, system architecture, and sensor characteristics.
The two devices have very different conversion-speed characteristics.
MCP3008 can operate at up to 200 ksps at 5V, making it suitable for applications that need relatively fast analog sampling. At a 2.7V supply, the maximum sample rate is specified as 75 ksps.
ADS1115 provides programmable data rates from 8 SPS to 860 SPS.
Therefore, MCP3008 has a major advantage when the application needs significantly higher sampling speed.
ADS1115 instead focuses on precision measurement and low-speed sensor acquisition.
MCP3008 provides eight single-ended input channels. It can also be configured for four pseudo-differential input pairs.
ADS1115 provides four single-ended inputs or two differential inputs through its internal multiplexer.
This means MCP3008 offers a larger number of analog input channels.
For a system that needs to monitor many analog sensors with relatively modest resolution requirements, the eight-channel configuration can be useful.
For applications where differential measurement and higher resolution are more important than channel count, ADS1115 may be a better fit.
Another major difference between MCP3008 and ADS1115 is the digital communication interface.
MCP3008 uses an SPI-compatible serial interface.
SPI generally provides a straightforward connection between an ADC and MCU or processor and can support relatively high data-transfer rates.
ADS1115 uses an I2C interface. It provides four pin-selectable I2C addresses, allowing multiple ADS111x devices to share the same bus under the supported addressing configuration.
The choice between SPI and I2C often depends on the available MCU peripherals, PCB routing, bus architecture, and the number of other devices connected to the system.
MCP3008 operates from 2.7V to 5.5V, making it suitable for both 3.3V and 5V embedded systems.
The wide supply range simplifies integration into many microcontroller and development-board designs.
The device also has low power consumption, with the datasheet specifying typical standby current in the nanoamp range and low active current.
ADS1115 operates from 2.0V to 5.5V for both its analog and digital supplies.
This makes it compatible with a broad range of embedded platforms.
TI specifies typical continuous-conversion current of approximately 150µA and describes the device as a low-power ADC intended for power- and space-constrained sensor applications.
One important feature that distinguishes ADS1115 from MCP3008 is its integrated programmable gain amplifier.
The ADS1115 PGA provides selectable full-scale input ranges from ±256mV to ±6.144V.
This can be useful when measuring low-level sensor signals.
Instead of adding an external amplifier before the ADC, engineers can use the integrated PGA to match the ADC input range more closely to the signal being measured.
This is particularly useful for applications involving sensors, thermocouples, bridge circuits, and other low-level analog sources.
MCP3008 uses a successive approximation register architecture with an integrated sample-and-hold circuit.
SAR ADCs are often selected when an application needs a combination of moderate resolution and relatively high sampling speed.
This architecture makes MCP3008 suitable for applications where analog signals change faster than the low-speed measurement signals typically handled by ADS1115.
Examples include multi-channel monitoring, control systems, and applications where a large number of analog inputs need to be sampled efficiently.
ADS1115 uses a delta-sigma conversion architecture.
This design is optimized for precision measurement rather than high-speed sampling. The device supports data rates from 8 SPS to 860 SPS and incorporates an internal low-drift reference and oscillator.
The architecture is therefore well suited to applications where sensor accuracy and measurement resolution are more important than rapid waveform acquisition.
MCP3008 is available in 16-pin PDIP and SOIC packages.
The PDIP version can be useful for development, prototyping, and through-hole designs, while the SOIC version is more suitable for compact PCB assemblies.
Microchip also specifies different temperature capabilities depending on package and qualification. The SOIC version is available with extended temperature and automotive qualification options, while the PDIP version is specified for a lower industrial temperature range.
ADS1115 is available in compact packages including VSSOP-10, SOT-10, and X2QFN-10.
The X2QFN package is particularly small, with dimensions of approximately 2mm × 1.5mm, making it suitable for space-constrained sensor and embedded designs.
This gives ADS1115 an advantage in applications where PCB area is limited.
One of the strongest reasons to choose MCP3008 is its eight analog input channels.
A single MCP3008 can monitor multiple analog sources while using one SPI interface to communicate with the host processor.
Potential applications include:
Sensor monitoring
Battery measurement
Industrial process monitoring
Robotics
Motor control
Data acquisition
Analog control
Multi-channel measurement
For systems where channel count is more important than high resolution, MCP3008 provides a practical architecture.
ADS1115 is particularly useful for precision sensor applications.
Its 16-bit resolution, programmable gain amplifier, internal reference, and differential input capability make it suitable for measuring relatively small analog signals.
Temperature measurement
Pressure sensing
Load-cell interfaces
Battery monitoring
Industrial sensors
Analog instrumentation
Precision data acquisition
The lower sampling rate is generally acceptable for sensors that change relatively slowly.
MCP3008 is frequently used in embedded projects where a processor needs external analog input capability.
Its SPI interface makes it practical for systems using processors or microcontrollers with SPI peripherals.
The eight-channel configuration is particularly useful when a system needs to connect several analog sensors without adding a large number of ADC devices.
This makes MCP3008 a practical option for multi-channel embedded data acquisition.
ADS1115 is also widely applicable to embedded systems, especially where a processor requires higher-resolution analog measurement.
Its I2C interface can reduce the number of dedicated MCU pins required for communication, while the four selectable addresses provide flexibility for multiple-device configurations.
The integrated PGA can also simplify the analog front end when measuring low-level signals.
If sampling speed is the primary requirement, MCP3008 has a clear advantage.
MCP3008 supports up to 200 ksps at 5V, while ADS1115 supports up to 860 SPS.
The difference is substantial.
MCP3008 is therefore better suited to applications that need relatively fast analog sampling.
ADS1115 is intended for precision measurements where high sampling speed is not the primary requirement.
ADS1115 has the higher nominal resolution.
MCP3008 provides 10-bit resolution, while ADS1115 provides 16-bit resolution.
For applications requiring finer digital representation of slowly changing analog signals, ADS1115 can provide a significant advantage.
However, the usable measurement performance depends on the complete analog signal chain and application conditions, not just the nominal ADC resolution.
MCP3008 provides eight single-ended channels.
ADS1115 provides four single-ended channels or two differential channels.
Therefore, MCP3008 is the better fit when the system needs to monitor a larger number of analog signals with a single ADC.
ADS1115 is more suitable when fewer channels are required but higher resolution and differential measurement are important.
Neither SPI nor I2C is universally better.
SPI is attractive when higher data-transfer performance and straightforward point-to-point communication are important.
I2C is attractive when multiple peripheral devices need to share the same two-wire bus.
MCP3008 uses SPI, while ADS1115 uses I2C.
The choice should therefore be based on the architecture of the embedded system rather than the ADC alone.
MCP3008 is a strong candidate for:
Multi-channel analog acquisition
Industrial automation
Embedded control
Fast sensor sampling
ADS1115 is better suited to:
Precision sensor measurement
Pressure measurement
Low-level analog signals
Industrial instrumentation
Slow-changing sensor applications
The actual choice depends on the signal characteristics and system requirements.
The main differences can be summarized as follows.
MCP3008 has eight single-ended channels, while ADS1115 has four single-ended or two differential channels.
MCP3008 operates from 2.7V to 5.5V, while ADS1115 operates from 2.0V to 5.5V.
ADS1115 integrates a PGA, internal reference, oscillator, and comparator, while MCP3008 uses a simpler SAR ADC architecture.
Choose MCP3008 when the design needs more analog channels, higher sampling speed, and a straightforward SPI interface.
Choose ADS1115 when the design prioritizes higher nominal resolution, low-level signal measurement, differential inputs, programmable gain, and I2C connectivity.
Neither device is a universal replacement for the other because their architectures and intended operating characteristics are significantly different.
For a new design, the ADC should be selected according to the required resolution, sample rate, number of channels, signal range, interface, power budget, and PCB space.
MCP3008 and ADS1115 demonstrate two different approaches to analog-to-digital conversion.
MCP3008 emphasizes multi-channel acquisition and relatively high sampling speed with a 10-bit SAR architecture and SPI interface.
ADS1115 emphasizes precision and integration with its 16-bit delta-sigma architecture, PGA, internal reference, comparator, and I2C interface.
For engineers searching for MCP3008 vs ADS1115, the most important question is not simply which ADC has better specifications. The better choice depends on whether the application needs speed and channel count or precision and integrated analog functions.
Before final component selection, the exact device specifications, input signal characteristics, sampling requirements, MCU interface, power supply, package, and system-level performance should be evaluated.
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