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Highly integrated ADC simplifies automotive radar apps

Sunnyvale, Calif. — Maxim Integrated Products has introduced the MAX11043, a quad, 16-bit, simultaneous-sampling ADC for sensor applications. Designed for continuous-wave (CW) chirp radar systems, this device provides a complete solution for conditioning and digitizing the IF signals from a 24-GHz or 77-GHz radar front-end for a DSP or microprocessor.

To minimize cost and save board space, the MAX11043 integrates four discrete analog filters; four high-precision, simultaneous-sampling ADCs; and a 12-bit control DAC in a 6 x 6-mm package. This integration makes it suitable for automotive radar applications, industrial control applications that use radar signals for level sensing or flow-rate measurements, power-grid monitoring, and other applications that require simultaneous sampling.

The MAX11043 contains a versatile filter block and PGA on each of its four channels. The filter consists of seven cascaded 2nd-order programmable filter sections, allowing the construction of a 14th-order filter. Each 2nd-order filter is configurable as low-pass, high-pass, or band-pass with optional rectification. Each PGA is programmable for a gain of 1 to 64 and includes an equalizer function to provide gain-versus-frequency characteristics for CW chirp radar. The signal path of each ADC can be customized and configured individually for optimal flexibility.

Other features include an internal or external reference, power-saving modes, and a two-stage, 12-bit DAC. The integrated DAC provides the VCO control voltage to the RF mixer in the radar front-end. With its adjustable DAC output range, this control voltage can be matched to the VCO's input-voltage range. The scan mode allows the ADC's results to be read while simultaneously updating the DAC to increase communications efficiency.

Housed in a 40-pin TQFN package, the MAX11043 operates from a 3.0-V to 3.6-V supply. It is fully specified over the -40° to +125° automotive temperature range.

Pricing: Starts at $8.03 (1000-up, FOB USA).
Datasheet: MAX11043

Maxim Integrated Products , 1-800-998-8800, www.maxim-ic.com

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