Analog Devices Inc. AD4632-24BBCZ

Overview

AD4632-24BBCZ from Analog Devices is a dual-channel, simultaneous-sampling, 24-bit SAR ADC with 500 kSPS per channel throughput, ±0.9 ppm INL over −40°C to +125°C, 105.7 dB SNR, and integrated reference buffer. It serves as the precision digitization core in high-fidelity signal chains for industrial instrumentation and scientific measurement systems.

For engineers reviewing the AD4632-24BBCZ datasheet, AD4632-24BBCZ pinout, AD4632-24BBCZ application, or AD4632-24BBCZ equivalent, key selection criteria include guaranteed 24-bit no-missing-codes performance at 500 kSPS, Easy Drive™ low-input-current analog interface (0.6 µA at 500 kSPS), Flexi-SPI configurable SDO lane count (1/2/4), echo clock mode for digital isolator integration, and internal supply/reference bypass capacitors in the 7 mm × 7 mm CSP_BGA package.

Technical Context

The AD4632-24BBCZ implements a successive approximation register architecture with simultaneous sampling across two independent channels, enabling true time-aligned acquisition for phase-critical applications. Its Easy Drive™ input stage reduces charge kickback and relaxes external driver requirements by limiting input current to 0.6 µA during acquisition at 500 kSPS.

Digital processing includes programmable block averaging (up to 2¹⁶ decimation) extending effective resolution to 30 bits and dynamic range to 152.7 dB, plus overrange and synchronization bits for real-time signal integrity monitoring. The Flexi-SPI interface supports SDR/DDR clocking, echo clock mode, and host clock mode with internal oscillator division (÷1/÷2/÷4) to simplify timing across isolation barriers.

Key Specifications

Pinout & Package

AD4632-24BBCZ uses a 7 mm × 7 mm, 64-ball chip-scale package ball grid array (CSP_BGA) with internal bypass capacitors on VDD_5V, VDD_1.8V, VIO, and REF pins. Ball pitch is 0.4 mm; thermal pad (exposed die attach) is centered under the package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD4630-24BBCZ, the AD4632-24BBCZ trades 4× lower throughput for 3× lower power at 500 kSPS and retains identical DC precision and noise performance; versus AD7606C-24BSTZ, it offers true dual-channel simultaneity, integrated reference buffering, and 0.6 µA input current - critical for isolated, low-power, high-fidelity signal chains.

Availability

AD4632-24BBCZ is available at Aetrix Electronics and suitable for automatic test equipment, medical instrumentation, and seismology systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for AD4632-24BBCZ 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD463x family was designed specifically for high-accuracy, low-power, dual-channel data acquisition in space-constrained, thermally demanding environments - emphasizing simultaneous sampling integrity, analog input simplicity, and system-level integration via embedded capacitors and flexible digital interfaces.

FAQ

What is the maximum sampling rate supported by the AD4632-24BBCZ?

The AD4632-24BBCZ supports a maximum throughput rate of 500 kSPS per channel in simultaneous sampling mode. This is a fixed specification for this variant - unlike the AD4630-24BBCZ, which operates at 2 MSPS. The 500 kSPS rate is guaranteed across the full industrial temperature range (−40°C to +125°C) with all specified AC/DC performance maintained, including ±0.9 ppm INL and 105.7 dB SNR.

Does the AD4632-24BBCZ require external bypass capacitors?

No, the AD4632-24BBCZ integrates all critical bypass capacitors internally: 1 µF for VDD_5V, 1 µF for VDD_1.8V, 0.2 µF for VIO, and 2 µF for the REF pin. This eliminates the need for external bulk capacitance, reducing PCB footprint by up to 30% and improving noise immunity. Only local 100 nF ceramic capacitors are recommended at each supply pin per Analog Devices' layout guidelines.

How does the Easy Drive™ feature benefit system design with the AD4632-24BBCZ?

The Easy Drive™ feature limits analog input current to just 0.6 µA at 500 kSPS, drastically reducing charge injection and settling burden on external driving amplifiers. This allows use of lower-power, lower-bandwidth op-amps - cutting front-end power by up to 40% and relaxing anti-alias filter design. It also enables direct connection to high-impedance sensors without active buffering in many precision measurement applications.

Can the AD4632-24BBCZ interface directly with a digital isolator?

Yes, the AD4632-24BBCZ supports echo clock mode, where the BUSY/SCKOUT pin outputs a clean, jitter-filtered replica of the host's SCK signal. This eliminates setup/hold timing violations across isolators and removes the need for complex delay-matching circuits. Combined with 1.2 V–1.8 V logic compatibility and low-power operation, it enables robust, certified isolation in medical and industrial safety-critical systems.

What reference voltage range is supported by the AD4632-24BBCZ?

The AD4632-24BBCZ accepts an external reference voltage from 4.096 V to 5 V at the REFIN pin when using the internal reference buffer, or at the REF pin when the buffer is disabled. The device guarantees full 24-bit performance across this range, with gain error drift as low as ±0.07 ppm/°C (buffer enabled) and support for standard precision references like the ADR4540 or LT6657.