Analog Devices Inc. AD7658BSTZ-1

Overview

AD7658BSTZ-1 from Analog Devices is a 12-bit, 6-channel simultaneous-sampling SAR ADC with true bipolar ±10 V/±5 V input ranges, 250 kSPS throughput, 73.5 dB SINAD at 10 kHz, and on-chip 2.5 V reference-designed for multichannel power monitoring and industrial control systems requiring synchronized acquisition across six analog inputs.

For engineers reviewing the AD7658BSTZ-1 datasheet, AD7658BSTZ-1 pinout, AD7658BSTZ-1 application, or AD7658BSTZ-1 equivalent, this page delivers verified specifications, validated pin functions, confirmed interface modes (parallel/serial/daisy-chain), exact power supply requirements (±16.5 V analog rails, 4.75–5.25 V digital), and real-world use context for precision multiaxis measurement and line-monitoring designs.

Technical Context

The AD7658BSTZ-1 implements six independent 12-bit successive approximation register (SAR) cores on iCMOS® process technology, enabling true bipolar input handling up to ±4 × VREF (±10 V) with 4.5 MHz full-power bandwidth and 35 ps aperture jitter. Its three CONVST pins (A/B/C) support independent, simultaneous sampling of three ADC pairs (V1/V2, V3/V4, V5/V6).

It integrates on-chip reference buffers and supports flexible interface operation: high-speed parallel mode (250 kSPS), SPI/QSPI/MICROWIRE-compatible serial mode, and daisy-chain configuration for multi-ADC systems-controlled via SER/PAR SEL, STBY, and H/S SEL pins with 3.1 µs conversion time and 550 ns track-and-hold acquisition.

Key Specifications

Pinout & Package

AD7658BSTZ-1 is housed in a 64-lead LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed pad for thermal enhancement. Pin functions are fully defined in Analog Devices Rev. D datasheet Figure 3 and Table 7.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel simultaneous-sampling ADC applications.

Compared with AD7658BSTZ-1, AD7656BSTZ-1 delivers 4-bit higher resolution and 14.5 dB better SINAD at the cost of higher power (140 mW → 140 mW same, but higher analog rail current) and stricter layout; AD7657BSTZ-1 offers a seamless 14-bit migration with identical footprint, timing, and interface behavior.

Availability

AD7658BSTZ-1 is available at Aetrix Electronics and suitable for power line monitoring, industrial motor control, and programmable logic controller (PLC) I/O modules requiring stable component supply, long-lifecycle assurance, and traceable sourcing for industrial automation deployments.

Supply support for AD7658BSTZ-1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing operations worldwide.

The AD7658BSTZ-1 belongs to the AD765x-1 family of simultaneous-sampling SAR ADCs, engineered specifically for industrial automation and energy infrastructure applications demanding synchronized multichannel acquisition, robust bipolar input handling, and reduced system-level decoupling complexity.

FAQ

What is the maximum analog input voltage range supported by the AD7658BSTZ-1?

The AD7658BSTZ-1 supports true bipolar analog input ranges of ±10 V (±4 × VREF) and ±5 V (±2 × VREF), selectable via the RANGE pin or software control bits. These ranges are enabled by its iCMOS® process, allowing operation with VDD up to +16.5 V and VSS down to −16.5 V-making it suitable for direct interfacing with industrial transducers and isolation amplifiers without external scaling.

Does the AD7658BSTZ-1 include an internal voltage reference?

Yes, the AD7658BSTZ-1 integrates a 2.5 V on-chip reference with ±1% initial accuracy, 6 ppm/°C temperature coefficient, and 150 ppm long-term stability over 1000 hours. It also provides dedicated REFCAPA/B/C pins for external 1 µF decoupling capacitors per ADC pair-ensuring stable reference buffering critical for maintaining 12-bit linearity across all six channels.

Can the AD7658BSTZ-1 perform simultaneous sampling across all six channels?

Yes-the AD7658BSTZ-1 achieves true simultaneous sampling using three dedicated CONVST inputs: CONVST A triggers V1/V2, CONVST B triggers V3/V4, and CONVST C triggers V5/V6. This architecture guarantees sub-4 ns aperture delay matching between paired channels, preserving phase coherence essential for power quality analysis and multiaxis motion control.

What interface options does the AD7658BSTZ-1 support?

The AD7658BSTZ-1 supports three interface modes: high-speed parallel (16-bit bus, 250 kSPS), SPI/QSPI/MICROWIRE-compatible serial (up to 18 MHz SCLK), and daisy-chain serial (multiple devices share one CS/SCLK/DOUT bus). Mode selection is controlled by the SER/PAR SEL pin, and serial operation requires configuration of H/S SEL and DCEN bits per the AD7658BSTZ-1 control register map.

What power supply voltages are required for the AD7658BSTZ-1?

The AD7658BSTZ-1 requires four independent supply domains: analog AVCC (4.75–5.25 V), digital DVCC (4.75–5.25 V), logic VDRIVE (2.7–5.25 V), and bipolar analog rails VDD (+10 to +16.5 V) and VSS (−10 to −16.5 V) for ±10 V input range operation. All AGND and DGND pins must be held within 0.3 V of each other to maintain 12-bit accuracy.