Dual 16bit 4Msample/s ADCs in 3x3mm

• 16bit AD7380
• 14bit AD7381

Dual simultaneous-sampling is available, and the firm is promoting them for motor control, sonar, power quality and data acquisition applications.

“The conversion process and data acquisition use standard control inputs allowing easy interfacing to microprocessors or DSPs. Integrated on-chip oversampling blocks improve dynamic range and reduce noise at lower bandwidths,” said Mouser Electronics, which is stocking the parts.

The serial interface has two separate data output pins, and data can be accessed via one or both. Sampling and conversion is on the falling edge of CS.

Analogue inputs are differential and accept “a wide common-mode voltage”, said Mouser.

Taking a look at a data sheet (but check both data sheets), common mode rage is 0.2V to Vref-, range is -Vref to +Vref, and absolute range is -0.1V to Vref+0.1V.

The buffered internal reference is 2.5V (typical drift ±1ppm/°C), although there is an option for up to 3.3V external reference.

CMRR (common mode rejection ratio) is -75dB at 500kHz.

SFDR (spurious-free dynamic range) of the 16bit version is −110dB.

Operation is over 3.0 to 3.6V power and −40 to +125°C ambient. Consumption is typically 21.5mA and 83mW (26mA and 107mW max)

Supports comes from two evaluation boards: EVAL-AD7380FMCZ and EVAL-AD7381FMCZ, which have to be used with the EVAL-SDP-CH1Z high-speed controller board.