AD7450ARM: 12-Bit 100 kSPS SAR ADC for Low-Power Data Acquisition

ElecSuppliers Part Number ComparisonAug 21, 2026

The AD7450ARM is a 12-bit successive-approximation analog-to-digital converter designed for low-power data acquisition and embedded measurement systems. It combines a differential analog input, 100 kSPS conversion rate, internal conversion circuitry and a compact serial interface.

The device is part of the AD7450 family and is designed for applications where a moderate sampling rate, differential signal measurement and low power consumption are more important than very high-speed conversion.

The complete AD7450ARM Part Number is especially relevant for PCB sourcing because the ARM suffix identifies the specific package configuration.

AD7450ARM Key Specifications

The AD7450 provides 12-bit resolution with a maximum throughput of 100 kSPS.

Its analog input is differential, allowing the converter to measure the voltage difference between two input terminals rather than requiring a conventional single-ended signal referenced directly to ground.

The device uses a SAR conversion architecture and provides a serial digital interface for transferring conversion results to a microcontroller, DSP or FPGA.

Its relatively low power consumption makes the AD7450 suitable for compact measurement equipment and embedded systems where the ADC may operate continuously from a limited power budget.

AD7450 12-Bit SAR Architecture

The successive-approximation architecture is well suited to applications requiring a predictable conversion process without the latency associated with a multi-stage pipeline ADC.

A 12-bit converter provides 4096 digital output codes across its input range.

At 100 kSPS, the AD7450 is aimed at signal acquisition in the low-frequency to moderate-frequency range rather than high-speed waveform digitization.

This makes the device appropriate for many sensor and instrumentation applications where the measured signal changes significantly slower than the ADC's maximum conversion rate.

AD7450 Differential Input

The differential input is an important feature of the AD7450.

A differential ADC can be used with a differential sensor output or with a signal-conditioning amplifier that produces a differential voltage.

This configuration can help reduce the effect of certain common-mode disturbances and can provide greater flexibility when connecting sensors that do not have a convenient ground-referenced output.

The source driving the ADC should still be designed according to the converter's input requirements.

Source impedance, acquisition time, signal settling and input common-mode conditions all affect the final conversion accuracy.

AD7450 Input Range

The AD7450 uses a differential input architecture with an input range determined by the reference and the selected operating configuration.

The input range should be considered when selecting the gain of the preceding amplifier.

If the sensor output occupies only a small portion of the ADC's available input range, the system may not make efficient use of the available 12-bit codes.

If the gain is too high, however, the signal can exceed the allowable input range and cause conversion clipping.

The ADC and its analog front end should therefore be designed together rather than selecting the ADC independently of the sensor interface.

AD7450 100 kSPS Sampling Rate

The maximum throughput of the AD7450 is 100 kSPS.

This provides a practical sampling rate for many industrial sensors, control signals and low-frequency instrumentation channels.

For a periodic input signal, the required sampling rate depends on its bandwidth and the anti-aliasing filter used before the ADC.

The 100 kSPS maximum should therefore not be interpreted as a recommended input frequency.

A properly designed analog filter is normally required to prevent unwanted higher-frequency signals from folding into the sampled data.

AD7450 Serial Interface

The AD7450 uses a serial data interface, allowing the ADC to communicate with a processor using only a small number of digital connections.

This is useful in compact embedded designs where PCB routing and processor I/O resources are limited.

Compared with a parallel ADC, the serial architecture can significantly reduce the number of digital traces between the converter and host processor.

The interface is also convenient for microcontrollers and DSPs that already provide hardware support for serial peripheral communication.

AD7450 Low-Power Operation

Power consumption is an important consideration in embedded data-acquisition systems.

The AD7450 is designed for low-power operation and can enter a shutdown state when continuous conversion is not required.

This makes the device useful for systems that measure periodically rather than continuously.

For example, a battery-powered monitoring system can wake the ADC, perform the required conversions and then return the converter to a lower-power state.

The overall system power savings depend on the sampling schedule and the power consumed by the sensor, amplifier and processor.

AD7450 Reference Considerations

The reference voltage establishes the scale used by the ADC to convert the analog input into digital codes.

Reference accuracy and stability therefore affect the absolute accuracy of the resulting digital measurement.

In precision applications, the reference should be treated as part of the measurement system rather than simply as another supply connection.

Noise on the reference can appear directly in the ADC output, while reference drift can introduce temperature-dependent gain error.

For this reason, reference routing and decoupling deserve particular attention in a high-accuracy AD7450 design.

AD7450 Analog Front-End Design

The AD7450's performance depends strongly on the circuit driving its analog input.

A sensor with high source impedance may require a buffer amplifier to provide the required transient current and allow the ADC input to settle properly.

A low-noise amplifier may also be needed when the sensor signal is close to the lower end of the ADC's input range.

The appropriate driver should therefore be selected based on noise, bandwidth, output-drive capability and settling behavior rather than simply choosing an amplifier with a similar supply voltage.

AD7450 Applications

The AD7450 can be used in a variety of moderate-speed measurement applications.

Typical applications include:

Industrial sensor interfaces

Portable measurement equipment

Process monitoring

Embedded data acquisition

Battery-powered instrumentation

Control systems

Test and measurement equipment

The device is particularly useful where 12-bit resolution is sufficient and the system does not require the multi-megasample throughput offered by high-speed SAR converters.

AD7450 for Sensor Measurement

Many industrial and embedded sensors produce signals that change relatively slowly.

Temperature, pressure, force, position and other physical parameters often do not require megasample-per-second conversion.

In these applications, the AD7450's 100 kSPS throughput provides considerable sampling margin while keeping the ADC architecture relatively simple.

The available sampling margin can also be used for digital averaging or filtering when the application prioritizes measurement stability over maximum bandwidth.

AD7450 in Embedded Data Acquisition

A typical AD7450 data-acquisition system can consist of a sensor, signal-conditioning amplifier, anti-aliasing filter, ADC and microcontroller.

The analog front end adjusts the sensor signal to the ADC input range.

The AD7450 then converts the conditioned signal into 12-bit digital data and transfers the result through its serial interface.

The microcontroller can subsequently apply calibration, filtering, scaling and communication functions.

This architecture is well suited to compact embedded systems because the ADC requires relatively few digital connections.

AD7450ARM Package

The AD7450ARM uses an 8-lead MSOP package.

The compact package is useful when PCB area is limited and the design uses surface-mount assembly.

This distinguishes AD7450ARM from other package variants in the same device family.

When sourcing a replacement, the package should be checked along with the electrical specifications because a converter with equivalent electrical performance may not use the same footprint.

For an existing PCB, the complete AD7450ARM Part Number should therefore be retained during component sourcing.

AD7450ARM Replacement Considerations

A suitable replacement for AD7450ARM should match the core ADC architecture and the requirements of the surrounding circuit.

Important factors include:

12-bit resolution.

100 kSPS or compatible sampling speed.

Differential input configuration.

Reference requirements.

Serial interface.

Supply voltage.

Power-down behavior.

Package and pin configuration.

A replacement ADC with the same resolution but a single-ended input may require changes to the analog front end.

Likewise, a device with a different serial interface or pinout may require PCB and firmware modifications.

AD7450ARM Selection Considerations

The AD7450ARM is most appropriate when the application requires a 12-bit differential SAR ADC with moderate sampling speed and a compact serial interface.

Its 100 kSPS throughput is sufficient for many sensor and industrial measurement systems while leaving substantial room for oversampling or digital filtering.

The differential architecture provides additional flexibility for signal conditioning, while the MSOP package helps reduce board area.

For new designs, the main selection factors are sensor bandwidth, required measurement resolution, input range, reference accuracy, power budget and processor interface.

AD7450ARM in Compact Data Acquisition

The AD7450ARM combines 12-bit SAR conversion, 100 kSPS throughput, differential analog measurement and serial data transfer in a compact package.

Its strengths are most apparent in low-power embedded instrumentation and moderate-speed sensor acquisition rather than applications requiring very high-speed waveform capture.

When paired with an appropriate analog driver and anti-aliasing filter, the AD7450ARM can provide a practical conversion stage for compact measurement systems where board area, power consumption and straightforward digital connectivity are important.