Analog Devices Inc. AD7367BRUZ-RL7

Product Summary AD7367BRUZ-RL7 from Analog Devices Inc.

The AD7367BRUZ-RL7, developed by Analog Devices Inc., is a high-speed, low power, dual 14-bit successive approximation register (SAR) analog-to-digital converter (ADC), housed in a space-saving 24-lead TSSOP package. The device forms part of the AD7367 series, standing out for its simultaneous sampling capability, true bipolar input compatibility, and advanced industrial-grade CMOS process technology (iCMOS®). With a maximum throughput rate of 1 MSPS for both channels, the AD7367BRUZ-RL7 is engineered for modern industrial measurement, instrumentation, and control environments requiring multi-channel accuracy, robust signal range, and seamless integration to digital processors.

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Main Features and Significant Performance Metrics of AD7367BRUZ-RL7

The AD7367BRUZ-RL7 delivers dual, simultaneously sampling 14-bit ADCs with no missing codes and a typical SNR of 76 dB at 50 kHz input. The device supports programmable analog input ranges—±10 V, ±5 V, 0 to 10 V, and ±12 V (with 3 V external reference)—empowering engineers to match diverse sensor and signal requirements. A high analog input impedance (260 kΩ at 1 MSPS, ±10 V range) further simplifies front-end signal conditioning.

Among its operational highlights, the AD7367BRUZ-RL7 achieves low power consumption (8.3 mA typ. in normal mode, 320 nA typ. in shutdown), an on-chip 2.5 V reference (±0.2%), and robust -40°C to +85°C temperature performance. Its serial interface supports high-speed communication with standard SPI™, QSPI™, MICROWIRE™, and DSP protocols. This suite of features makes it suitable for engineers designing cost-effective yet high-accuracy DAQ or monitoring solutions.

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Design Structure and Operational Specifications of the AD7367BRUZ-RL7

At the heart of the AD7367BRUZ-RL7 is a dual SAR ADC core, each preceded by a dedicated 2-channel multiplexer and a low-noise track-and-hold amplifier. The device supports two simultaneous, independent analog-to-digital conversions, managed through precise control logic triggered by a chip-select and conversion-start input. The sampling capacitors enable highly accurate charge redistribution for SAR operation, resulting in superior linearity and minimal distortion across the available voltage ranges.

To accommodate industrial voltage levels, the device’s iCMOS process allows operation with analog supply voltages up to ±16.5 V, separating analog and digital domains for optimal noise immunity. The input structure includes robust ESD protection, while the absence of an input resistor network means high-impedance, low-bias-current performance suitable for connecting directly to sensors or buffers.

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Analog Input Levels, Input Resistance, and Source Compatibility for AD7367BRUZ-RL7

A distinctive advantage of the AD7367BRUZ-RL7 is its flexibility in analog input range selection: ±10 V, ±5 V, or 0 to 10 V (set by logic levels on RANGE0 and RANGE1 pins). With an external 3 V reference and appropriate ±12 V supplies, the input range extends to ±12 V, broadening compatibility with a variety of industrial transducers and sensors.

Crucially, the high analog input impedance (typically 260 kΩ at 1 MSPS for ±10 V inputs) minimizes sensor loading. However, for applications demanding critical ac performance (like low total harmonic distortion or high SNR), input signals should be driven by low-impedance sources or suitable buffer amplifiers, such as the AD8021, AD8022, AD797, AD845, or AD8610. The analog input channel selection is controlled by the ADDR pin.

For optimal settling, especially at the fastest sampling rates, source impedance must be kept sufficiently low to allow the sampling capacitor to charge within 140 ns (typical acquisition time for full 14-bit accuracy).

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Power, Reference, and Interface Setup Choices for AD7367BRUZ-RL7

The AD7367BRUZ-RL7’s flexibility extends to power, reference, and interface domains. The device requires dual analog supplies (VDD and VSS, ±11.5 V to ±16.5 V) for its high-voltage analog inputs, in addition to typical digital and analog core supplies (4.75 V to 5.25 V for AVCC and DVCC) and a separately supplied interface voltage (VDRIVE, 2.7 V to 5.25 V). This allows seamless digital interfacing to both 3 V and 5 V logic systems without sacrificing analog input range.

An internal precision 2.5 V reference is provided and can source up to 150 µA (±10 V range). If another voltage or tighter drift specifications are needed, the reference can be externally supplied (typically 2.5 V to 3 V), with suitable devices including the AD780, ADR431, and REF193. The switching between internal and external reference modes is managed using the REFSEL pin at power-up.

The VDRIVE feature decouples digital interface voltage from the analog supply rails—vital for mixed-signal systems or when direct connection to a digital processor’s I/O voltage is required.

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Standard Connections, Working Modes, and Serial Communication Properties of the AD7367BRUZ-RL7

A standard connection configuration for the AD7367BRUZ-RL7 comprises dedicated analog and digital grounds, appropriate decoupling (0.1 µF and 10 µF capacitors near the supply pins), and logic set per the application's range, reference, and channel selection needs. The serial interface (SPI-compatible) offers two separate DOUT pins (one per channel) and supports up to 48 MHz SCLK.

Regarding operation modes, the AD7367BRUZ-RL7 implements both normal and shutdown modes, optimizing either throughput or power savings. In normal mode, the part is always powered and ready for conversions at the highest rates. Shutdown mode, on the other hand, drastically lowers supply current—an advantage for remote or battery-operated monitoring systems.

A conversion is initiated by a falling edge at CNVST; simultaneous sampling is performed, and conversions are completed in under 1 µs. The BUSY pin monitors conversion status. Data is read over the serial interface with up to 14 clock cycles per channel (28 total for dual-channel read), with nCS controlling data latching and three-state output.

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AD7367BRUZ-RL7 Integration with Microprocessors and DSPs

The AD7367BRUZ-RL7 is engineered for direct interfacing with a range of microprocessors and DSPs, which facilitates integration into diverse embedded systems. Comprehensive application notes and diagrams are available for connections to Analog Devices’ ADSP-218x and Blackfin (ADSP-BF53x) DSPs, Texas Instruments’ TMS320VC5506, and Motorola’s DSP563xx families.

Key to efficient integration is the VDRIVE input, which allows the digital interface levels to match host processor requirements. In simultaneous-sampling data acquisition scenarios—such as multi-axis motor control, medical instrumentation, or power grid monitoring—the dual-channel output and serial configuration options enable time-aligned, parallel data capture with minimal glue logic.

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Recommended PCB Layout and Grounding Techniques for AD7367BRUZ-RL7

To leverage the performance of the AD7367BRUZ-RL7, stringent PCB design practices are essential. Analog and digital ground planes should be separated and joined at a single point close to the device’s ground pins. Power and ground traces should be as short and wide as practicable to minimize impedance and noise.

Placement of decoupling capacitors (10 µF tantalum in parallel with 0.1 µF low-ESR ceramic) as near as possible to supply pins is recommended. Avoid running digital traces beneath the analog IC section, and bundle high-speed digital lines away from sensitive analog inputs. Laying out the PCB to prevent digital-to-analog crosstalk and ensuring proper shielding is vital, particularly for high-resolution or high-speed analog sampling.

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Alternative or Substitute Devices Comparable to AD7367BRUZ-RL7

When evaluating the AD7367BRUZ-RL7 for selection or replacement scenarios, engineers may consider several close alternatives within Analog Devices’ portfolio or from other manufacturers. The primary direct alternative is the AD7366, which retains much of the same design but implements a 12-bit resolution (instead of 14-bit) and slightly lower SNR—suitable where ultra-high resolution is not required but pin-compatibility and similar input voltage handling are desired.

Other SAR ADCs with dual, simultaneous-sampling capability, wide input range, and SPI interface may also serve as functional replacements. However, key considerations will include matching analog input range programmability, power supply requirements, serial interface compatibility, and package outline to ensure minimal PCB redesign.

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Conclusion

: Engineering considerations for selecting the AD7367BRUZ-RL7

The AD7367BRUZ-RL7 enables precision, high-speed, and robust analog-to-digital conversion across a wide voltage range, making it a strong candidate for modern industrial data acquisition, instrumentation, and control systems. Its true bipolar input support, high input impedance, flexible reference and interface options, and compatibility with mainstream microcontrollers and DSPs offer procurement specialists and engineers a highly adaptable solution. Successful implementation calls for attention to layout, signal integrity, and input drive configuration, ensuring that the device’s full capabilities can be harnessed in demanding application environments. For applications requiring slightly less resolution, the AD7366 provides a lower-bit alternative in the same family. When selecting a solution, careful attention to electrical, mechanical, and interface specifics will guarantee optimal system integration and measurement fidelity.