Analog Devices Inc. AD7612BSTZ

Overview

AD7612BSTZ from Analog Devices is a 16-bit, 750 kSPS PulSAR® successive approximation register (SAR) ADC with programmable unipolar/bipolar input ranges (±10 V, ±5 V, 0–10 V, 0–5 V), integrated 5 V reference (±3 ppm/°C drift), and dual parallel/serial (SPI/QSPI/MICROWIRE/DSP-compatible) interfaces. It operates across −40°C to +85°C and targets high-precision data acquisition in process control and medical instrumentation.

For engineers reviewing the AD7612BSTZ datasheet, AD7612BSTZ pinout, AD7612BSTZ application, or AD7612BSTZ equivalent, key selection considerations include its warp-mode throughput (750 kSPS), ±1.5 LSB max INL, no missing codes guarantee, iCMOS™ high-voltage process compatibility, and flexible hardware/software configuration of input range and sampling mode.

Technical Context

The AD7612BSTZ implements a charge redistribution SAR architecture with zero pipeline delay, enabling deterministic timing for real-time control loops. Its internal conversion clock, error correction circuitry, and dual-domain power supplies (AVDD/DVDD/OVDD/VCC/VEE) support simultaneous analog signal integrity and digital interface flexibility.

Configuration is achieved via dedicated hardware pins (WARP, IMPULSE, BIPOLAR, TEN, SER/PAR) or a write-only serial configuration port (SCIN/SCCLK/SCCS), allowing runtime reconfiguration of input range, polarity, and sampling mode without firmware overhead. The on-chip temperature sensor (311 mV @ 25°C, 1 mV/°C) enables system-level thermal compensation.

Key Specifications

Pinout & Package

AD7612BSTZ is housed in a Pb-free, 48-lead LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed pad (connected to VEE per datasheet Note 1). Pin functions are validated per Analog Devices AD7612 Rev. A datasheet, Table 6 and Figure 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision SAR ADC applications.

Compared with AD7612BSTZ, AD7622BCPZ offers higher speed but demands external reference design and tighter layout controls, while ADS8860IDRCT reduces size and power at the cost of input flexibility and configurability - AD7612BSTZ uniquely balances hardware-programmable ranges, integrated reference, and dual-interface versatility in a standard LQFP.

Availability

AD7612BSTZ is available at Aetrix Electronics and suitable for process control, medical instrumentation, and automated test equipment requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for AD7612BSTZ 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 design centers worldwide.

The AD7612BSTZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for industrial and medical applications demanding high resolution, low noise, and robust operation across extended temperature ranges.

FAQ

What input voltage ranges does the AD7612BSTZ support, and how are they selected?

The AD7612BSTZ supports four input ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V. Selection is performed either via hardware pins (TEN and BIPOLAR) or through the serial configuration port. Hardware selection enables immediate, glitch-free range changes without software intervention - a key advantage in deterministic real-time systems where the AD7612BSTZ is deployed.

Does the AD7612BSTZ require an external reference, or does it include one internally?

The AD7612BSTZ integrates a 5 V internal reference with ±35 mV initial accuracy and ±3 ppm/°C temperature drift. When PDREF and PDBUF are driven low, the REF pin outputs this stabilized 5 V reference. Alternatively, an external 4.75–5.25 V reference can be applied to REF with PDREF/PDBUF high - giving system designers flexibility without redesigning the AD7612BSTZ's reference path.

What are the differences between warp, normal, and impulse sampling modes in the AD7612BSTZ?

Warp mode delivers 750 kSPS with 1.33 μs conversion time for maximum speed; normal mode achieves 600 kSPS with asynchronous timing for flexible host interfacing; impulse mode scales power linearly with throughput (500 kSPS base) to minimize average power in burst-acquisition systems. All three modes are selectable via the WARP and IMPULSE pins on the AD7612BSTZ, enabling hardware-based optimization without firmware overhead.

Can the AD7612BSTZ interface directly with a 3.3 V microcontroller, and what voltage domains must be observed?

Yes - the AD7612BSTZ supports 3.3 V logic levels via its OVDD supply (2.7–5.25 V), which powers all digital I/O including D[15:0], CS, RD, and BUSY. AVDD/DVDD must be 4.75–5.25 V for analog/digital core operation, while VCC/VEE (±15 V) power the analog front-end. This separation allows safe interfacing with 3.3 V hosts while maintaining high-voltage signal integrity - a defined operating condition for the AD7612BSTZ.

How does the AD7612BSTZ handle power-down, and what functionality remains active?

Driving the PD pin high places the AD7612BSTZ into power-down mode, reducing total power dissipation to <10 μW. Conversions are inhibited after completion of the current cycle, but the digital interface (CS, RD, SER/PAR, etc.) remains fully operational - enabling wake-up via host command without reset. This behavior is explicitly specified in the AD7612BSTZ datasheet Absolute Maximum Ratings and Power Supply sections.