MAX1246ACPE

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Data Acquisition - Analog to Digital Converters (ADC)

The MAX1246ACPE is a low power, 150Msps, 8-channel, 12-bit analog-to-digital converter (ADC) with a complete background calibration feature that supports both Real-Time Input and Parallel-Input applications.

The MAX1246ACPE is optimized for use in high speed and single-supply instrumentation and wireless applications. It has a low power consumption of only 104mW/channel, making it well-suited for portable applications. It operates from a single 2.5V to 3.3V supply and consists of eight successive-approximation-register (SAR) converters. The device also offers asynchronous parallel-channel programming and digital filtering, which reduces calibration time and improves resolution and linearity for multiplexed applications.

Application Field and Working Principle

The MAX1246ACPE is suitable for radar and communications systems, ultrasound imaging systems, test and measurement, medical imaging, automotive and seismic applications. It features a wide input voltage range of 0V to AVDD, and an input clock rate of up to 150Msps. It is also suitable for applications where speed and power management are essential.

The ADC in the MAX1246ACPE is configured and sequenced by a single 3-wire logic interface and includes two external PGA that provides 16 distinct gain settings. The ADC can be programmed to use either Ratio Mode or Single-Ended Mode. In Ratio Mode, the ADC uses a logarithmic (non-linear) algorithm to measure a signal\'s ratio between a reference voltage and the input signal and generates a qualitative result. In Single-Ended Mode, the ADC measures the input signal relative to a common-mode voltage and provides a linear result.

The core of the MAX1246A is an input sample-and-hold amplifier (SHA), SC directly programmable (DP) switch, two-channel successive approximation register (SAR) analog-to-digital converter (ADC), digital processing and control engine, and a digital output stage. The SHA and DP switch are used in concert with the SAR ADC to generate accurate, precise results without the need for external components.

The DP switch allows direct programming of the input range and offset settings, eliminating the need for manual adjustment of the gain and offset. The SHA amplifies the input signal, converts the signal from a floating point to a 12-bit digital code, and then sends it to the SAR ADC for further conversion to a digital result. The digital processor control engine allows for straightforward control of conversion settings, allowing for customization of the ADC operation to meet specific applications.

In addition to the high speed throughput and precision, the MAX1246ACPE has a complete background calibration feature, which reduces calibration time and ensures a high level of operational accuracy over time. This feature allows the MAX1246ACPE to be used in automotive and seismic applications, where accuracy and consistency are essential.

The MAX1246ACPE is an ideal choice for applications requiring high speed, low power, and precision. It is capable of generating accurate, precise results without the need for external components and offers a number of features such as asynchronous parallel-channel programming, background calibration, and digital filtering.

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