AD7608BSTZ: 18-Bit, 8-Channel Simultaneous Sampling ADC — Specs, Design Guide, and Alternatives

Quick Answers

The AD7608BSTZ from Analog Devices is an 18-bit, 8-channel, simultaneous sampling data acquisition system (DAS) with a verified 200 kSPS per-channel sampling rate, ±10 V/±5 V/±2.5 V bipolar inputs, and a 64-lead LQFP (10x10 mm) package. Active production status, 99,999 units in stock at XAIPART, and a verified MOQ of 1 make it readily available for design and production. As of 2026-08-25, the verified pricing tier is $65.4545 at qty 1, $47.2727 at qty 10, $41.8182 at qty 100, $40 at qty 500, and $38.1818 at qty 1000. This guide covers selection, design-in, direct alternatives, and supply outlook. Engineers evaluating precision power-line monitoring, motor control, or vibration analysis can use this article as a single source for verified AD7608BSTZ specifications. Download the verified datasheet: AD7608 datasheet (Rev. C).

Technical Guide: How to Design In the AD7608BSTZ

The AD7608BSTZ combines an integrated analog input clamp protection, a second-order antialias filter, track-and-hold amplifiers, an 18-bit charge redistribution SAR ADC, a flexible digital filter, and a 2.5 V reference with buffer in a 64-lead LQFP package. It operates from a single 5 V analog supply (AVCC) and interfaces through parallel or SPI/DSP serial ports. This integration simplifies the analog front-end for multi-channel precision applications.

Input Ranges and Signal Conditioning

Use the ±10 V, ±5 V, or ±2.5 V input ranges to match common transducer outputs. In power-line monitoring, the ±10 V range connects directly to current transformers (CTs) and potential transformers (PTs) through scaling resistors. The integrated input clamp protection minimizes external protection circuitry in harsh industrial environments.

Antialias and Digital Filtering

The built-in second-order antialias filter has a 22 kHz 3 dB cutoff and provides 40 dB rejection at 200 kSPS. This reduces external filtering before the ADC. The flexible, pin-driven digital filter enables programmable oversampling: you can trade bandwidth for improved signal-to-noise ratio when the application tolerates lower output data rates.

Reference and Power Supply Decoupling

The internal 2.5 V reference and buffer maintain gain stability over temperature. Place decoupling capacitors close to the AVCC and DVCC pins, and route the reference decoupling capacitor adjacent to REFIN/REFOUT. This layout guidance is recommended in the verified product data and helps ensure rated performance.

Host Interface Options

Connect the AD7608BSTZ to MCUs, DSPs, or FPGAs using either the parallel interface or the serial SPI/DSP interface. The parallel bus is well suited to FPGA-based high-speed acquisition; the serial interface reduces pin count on smaller controllers.

For a three-phase power-monitoring front end, calculate the sample-per-cycle benchmark: at 200 kSPS per channel and a 50 Hz fundamental, you capture 200,000 / 50 = 4,000 samples per cycle. For higher-frequency analysis, the 22 kHz antialias passband accommodates harmonic components while the 40 dB rejection at 200 kSPS reduces out-of-band aliasing.

Alternatives & Comparison: Drop-In Options for the AD7608BSTZ

The verified alternatives list includes three pin-compatible or package-compatible family options from the same Analog Devices family. The AD7606CSTZ provides 16-bit resolution with the same 8 channels and 200 kSPS performance as an enhanced performance variant. The AD7607BSTZ is a 14-bit version with the same 8 channels and package/pinout. Two other variants reduce the active channel count but keep 16-bit resolution: AD7606-6BSTZ has 6 active channels (two unused) and AD7606-4BSTZ has 4 active channels (four unused).

All values come from the verified product database. Before substitution, confirm the digital interface and reference connections because the alternative rows do not include complete interface data in this verified set. See the AD7608BSTZ product page for the latest inventory and lead time.

Industry Insight: Lifecycle, Stock, and Supply Situation

The AD7608BSTZ is in active production status, meaning it is not nearing end-of-life. XAIPART lists 99,999 units in stock with a MOQ of 1, which indicates immediate sample and production availability. As of 2026-08-25, the verified quantity pricing is $65.4545 (1 pc), $47.2727 (10 pcs), $41.8182 (100 pcs), $40 (500 pcs), and $38.1818 (1000 pcs). The verified base price is $38.1818.

Distributor availability data in the verified FAQ also shows active listings. As of 23 August 2026, Analog Devices 1ku list price was $27.75, DigiKey carried active stock with same-day shipping, Mouser listed inventory, and LCSC stocked the part at approximately $26.05. Buyers should confirm real-time lead times at checkout.

Trends & Outlook: What Buyers Should Watch

The verified specifications point to continued usefulness for systems that require phase-coherent, multi-channel measurements: 18-bit resolution, 200 kSPS per channel, simultaneous track-and-hold, and bipolar input capability are the key differentiators. Buyers should watch two trends:

• Resolution-driven selection: Because AD7608BSTZ provides 18 bits while AD7606CSTZ and AD7607BSTZ provide 16 and 14 bits respectively, designers needing finer dynamic range will continue choosing the 18-bit part for protective relays and high-accuracy energy metering.
• Integration and BOM reduction: The internal 2.5 V reference, input clamp protection, and second-order antialias filter reduce external component count, making the AD7608 attractive for space-limited industrial front ends.
• Digital filter performance: The pin-driven digital filter gives system architects an easy noise-reduction lever without changing hardware. As algorithms demand more SNR, this feature becomes increasingly valuable.

When planning life-cycle inventory, the active production status and high stock level de-risk procurement. For cost-sensitive designs that can tolerate lower resolution, the pin-compatible AD7606CSTZ is a verified alternative to evaluate. More guidance is available in the ADC/DAC technical guides section.