AD7788ARMZ

The AD7788/AD7789 are low power, low noise, analog front ends for low frequency measurement applications. The AD7789 contains a low noise, 24-bit, ∑-∆ analog-to-digital converter (ADC) with one differential input. The AD7788 is a 16-bit version of the AD7789. The devices operate from an internal clock. Therefore, the user does not have to supply a clock source to the devices. The output data rate is 16.6 Hz, which gives simultaneous 50 Hz/60 Hz rejection. The devices operate with a single power supply from 2.5 V to 5.25 V. When operating from a 3V supply, the power dissipation for the device is 225 μW maximum. The AD7788/AD7789 are available in a 10-lead MSOP.

Applications

• Smart transmitters
• Battery applications
• Portable instrumentation
• Sensor measurement
• Temperature measurement
• Pressure measurement
• Weigh scales
• 4 to 20 mA loops

Key features

• AD7788: 16-bit resolution
• AD7789: 24-bit resolution
• Power Supply: 2.5 V to 5.25 V operation Normal: 75 μA maximum Power-down: 1 μA maximum
• RMS noise: 1.5 μV
• AD7788: 16-bit p-p resolution
• AD7789: 19-bit p-p resolution (21.5 bits effective)
• Integral nonlinearity: 3.5 ppm typical
• Simultaneous 50 Hz and 60 Hz rejection
• Internal clock oscillator
• VDD monitor channel
• 10-lead MSOP
• 3-wire serial
• SPI-, QSPI-, MICROWIRE-, and DSP-compatible
• Schmitt trigger on SCLK