Analog Devices Inc. AD7866ARUZ-REEL

AD7866ARUZ-REEL7: Dual 12-Bit, 1 MSPS SAR ADC with Serial Interface

The AD7866ARUZ-REEL7 is a high-performance, dual-channel, 12-bit successive approximation register (SAR) analog-to-digital converter (ADC) designed for applications requiring high-speed data acquisition with low power consumption. Operating from a single 2.7 V to 5.25 V power supply, it achieves a throughput rate of up to 1 million samples per second (MSPS). Each ADC core is preceded by a low-noise, wide-bandwidth track-and-hold amplifier capable of handling input frequencies exceeding 10 MHz, ensuring accurate signal capture even for high-frequency signals. The device features a flexible SPI/QSPI/MICROWIRE/DSP-compatible serial interface, simplifying integration with microcontrollers or digital signal processors (DSPs). The conversion process is initiated on the falling edge of the chip select (CS) signal, with conversion time determined by the serial clock (SCLK) frequency. The AD7866ARUZ-REEL7 offers no pipeline delays, enabling simultaneous conversion and read operations, which is critical for real-time systems. Its 20-lead TSSOP package and extended temperature range (-40°C to +125°C) make it suitable for industrial, automotive, and portable applications.

Key technical specifications include a 70 dB signal-to-noise ratio (SNR) at 300 kHz input frequency, a 2.5 V onboard reference voltage, and ultra-low power dissipation—just 11.4 mW at 3 V supply and 1 MSPS throughput, or 24 mW at 5 V. The device also supports flexible power/throughput management, allowing users to optimize performance based on application requirements. In shutdown mode, current consumption drops to a mere 1 µA, extending battery life in portable devices. Its dual-channel architecture enables synchronized sampling of two analog inputs, making it ideal for applications like motor control, power monitoring, and sensor interfacing. The AD7866ARUZ-REEL7’s combination of high speed, low power, and compact form factor positions it as a leading solution for space-constrained, energy-efficient designs.

For designers seeking alternatives, the AD7606-6 (16-bit, 6-channel ADC with 200 kSPS throughput), AD7616 (16-bit, 16-channel ADC with 250 kSPS), and AD7768-4 (24-bit, 4-channel sigma-delta ADC with 128 kSPS) offer varying resolutions and channel counts. The AD7903 (12-bit, 1 MSPS SAR ADC with differential inputs) and AD7689 (16-bit, 1 MSPS SAR ADC with I²C interface) provide similar performance with different interface options. These alternatives cater to diverse needs, from high-resolution multi-channel systems to compact, low-power designs.