AD7607BSTZ

The AD7607BSTZ is a 14-bit, 8-channel, simultaneous sampling data acquisition system (DAS) from Analog Devices, featuring a complete analog front-end with SAR ADC architecture. Fabricated in advanced CMOS process technology, this device integrates all necessary signal conditioning and data conversion circuitry into a single chip: analog input clamp protection circuits tolerant to ±16.5V overvoltage, high-input-impedance buffer amplifiers (1 MΩ), second-order anti-aliasing filters with 22 kHz cutoff, a 14-bit charge-redistribution successive approximation ADC, a flexible digital filter engine, and a precision 2.5V on-chip reference with buffer amplifier. The AD7607 accepts true bipolar input signals of ±10V and ±5V ranges while operating from a single 5V analog supply, eliminating the need for external dual-supply amplifiers and level translation. Its eight channels capture all input signals simultaneously at up to 200 kSPS per channel, preserving the phase relationship between channels — critical for three-phase power monitoring, multi-axis motion control, and synchronized sensor arrays. The device offers both high-speed parallel and serial (SPI/QSPI/MICROWIRE/DSP-compatible) interfaces for flexible system integration. The AD7607 is part of a pin-compatible family spanning 14-bit to 18-bit resolutions (AD7605 through AD7609), enabling easy performance upgrades without PCB redesign. With 7kV ESD protection on analog inputs, low 100mW power dissipation, and a compact 64-lead LQFP package, the AD7607BSTZ is the ideal choice for demanding industrial, instrumentation, and power system applications.

The AD7607 operates as a simultaneous-sampling successive approximation register (SAR) analog-to-digital converter system. Simultaneous sampling means that all eight analog input channels are sampled at precisely the same instant, eliminating the time-skew errors that occur in sequential (multiplexed) ADC architectures. This is achieved using eight independent track-and-hold (T&H) amplifiers that all transition from track mode to hold mode on the same edge of the CONVST signal. Once the inputs are captured, each channel’s SAR ADC converts its held analog voltage into a 14-bit digital value through a charge-redistribution process. The SAR algorithm works by iteratively comparing the input voltage against a series of binary-weighted reference voltages generated by an internal capacitive DAC, determining each bit from MSB to LSB through successive comparisons. The AD7607 includes integrated input buffers with 1 MΩ impedance, reducing the drive requirement on the signal source compared to unbuffered ADC inputs. The second-order anti-aliasing filter removes frequency components above the Nyquist frequency before sampling, preventing aliasing of high-frequency noise into the signal band. An on-chip 2.5V buried zener reference provides the voltage reference for the SAR conversion, with an external reference option available for systems requiring higher precision or matched references across multiple devices. Digital filtering options (sinc1, sinc2, sinc3, and FIR) are configurable via pins or serial register settings, allowing the user to trade off throughput for noise performance. The conversion results can be read out via a parallel interface (byte or word mode) or a high-speed serial interface, with two serial data outputs (DOUTA and DOUTB) to support daisy-chaining multiple devices. The overall architecture delivers true simultaneous multi-channel sampling with high accuracy and low power in a compact form factor.

The AD7607BSTZ is available in a 64-lead LQFP package. Key pin functions are organized as follows:

For complete pin descriptions, timing diagrams, and recommended operating conditions, refer to the official AD7607 datasheet.

• Power Line Monitoring & Protection: Used in electricity meters, power quality analyzers, and relay protection equipment for simultaneous three-phase voltage and current sampling, enabling accurate power calculation, harmonic analysis, and fault detection
• Multi-Phase Motor Control: Deployed in servo drives, BLDC/PMSM motor controllers, and variable frequency drives for simultaneous current and voltage sensing across all phases, supporting FOC and advanced control algorithms
• Industrial Data Acquisition: Used in PLC analog input modules, distributed I/O systems, and SCADA front-ends for multi-channel industrial sensor signal acquisition with high accuracy and channel synchronization
• Instrumentation & Test Equipment: Found in oscilloscopes, data loggers, and spectrum analyzers where multiple signals must be captured simultaneously for time-correlated analysis
• Multi-Axis Motion Control: Used in CNC machines, robotics, and 3D printers for synchronized position/velocity feedback across multiple axes, enabling precise coordinated motion
• Energy & Power Systems: Deployed in renewable energy inverters (solar, wind), UPS systems, and battery management for multi-point voltage and current monitoring
• Medical Instrumentation: Used in patient monitoring equipment and diagnostic devices where multiple biosignals require synchronized sampling
• Process Control & Automation: Found in process controllers for chemical, pharmaceutical, and food processing industries requiring synchronized multi-parameter monitoring