Maxim new single supply Bipolar SAR ADC
December 2012 – Emphasizing the need for low power and high performance in industrial applications, the new Maxim MAX11166 and MAX11167 Analog to Digital Converters have been introduced. These 16bit SAR style ADCs feature a max sample rate of 500ksps and 250ksps respectively. Using Bipolar technology, these 12 pin devices are the latest in the single supply “beyond the rails” technology support +/- 5V applications with just a +5v supply.
The devices features a built in charge pump and references to generate the negative rail for the design, without external components and more importantly, support a full 16bit stable set of voltage references that is generated also from the single +5V +/-5% supply. The devices have an adjustable sampling rate that at maximum speed, consumes only 19.5mW and can go as low as 1uA of current in standby mode.
Maxim MAX11166 & MAX11167 Block Architecture
The serial interface devices (architecture shown in figure 1) has a full range 92./6dB SNR, and +/-0.5 LSB INL and +/-0.2 LSB DNL which insures no missing codes over the full range. These devices can be used in multi-channel applications, as the 9mm2 devices have a “busy” signal to support multi-device synchronization and timing. For lower power operation, the device features reference buffer amplifiers that external references and disable the internal ones.
The unit operates over full industrial temperature of -40C to +85C for use in precision measurement data acquisition systems (DASs), industrial/process control, medical instrumentation, and automatic test equipment (ATE). The low power support and simple pin configuration, makes the part ideal for enhanced camera rig and position control applications where portable power is the dominant driver. The parts are applicable for automotive applications, however they have not been qualified for the automotive flow as yet. The parts are currently available, and an extended resolution 18 bit version will be available in the first half of 2013.
