Analog Devices Inc. AD4682BCPZ-RL

Overview

AD4682BCPZ-RL from Analog Devices is a dual, simultaneous-sampling, 16-bit SAR ADC with pseudo-differential inputs, 1 MSPS throughput, 87.5 dB SNR (VREF = 3.3 V), ±2.5 LSB INL max, and integrated 2.5 V reference - designed for high-precision motor current/position feedback and power quality monitoring in industrial control systems.

For engineers reviewing the AD4682BCPZ-RL datasheet, AD4682BCPZ-RL pinout, AD4682BCPZ-RL application, or AD4682BCPZ-RL equivalent, key selection considerations include simultaneous dual-channel sampling integrity, oversampling-enabled dynamic range boost (up to 93.4 dB), alert threshold functionality, and LFCSP-16 package compatibility with space-constrained embedded signal chains.

Technical Context

The AD4682BCPZ-RL implements two independent successive approximation register (SAR) cores with shared SPI interface and dual serial outputs (SDOA/SDOB), enabling true simultaneous acquisition on AINA± and AINB± pseudo-differential pairs. Conversion is triggered on the falling edge of CS, with aperture delay matched to ≤100 ps between channels.

It integrates an on-chip oversampling block supporting rolling-average mode (OSR ×4 or ×8), resolution boost (RES=1), and configurable alert output via SDOB/ALERT pin. The device supports both internal 2.5 V buffered reference and external reference up to 3.3 V, with REFSEL bit control and dedicated REFCAP/REFIO decoupling.

Key Specifications

Pinout & Package

AD4682BCPZ-RL is housed in a 3 mm × 3 mm, 16-lead LFCSP (CP-16-451) with exposed pad (EPAD) requiring connection to PCB ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, high-speed SAR ADC applications.

Compared with AD4683BCPZ-RL, the AD4682BCPZ-RL delivers 2× throughput and higher SNR at the cost of 50% more power; versus AD7380BCPZ-RL, it trades raw speed for integrated reference, oversampling, and alert functionality - reducing BOM count and firmware overhead in industrial feedback systems.

Availability

AD4682BCPZ-RL is available at Aetrix Electronics and suitable for motor control position feedback, power quality monitoring, and Erbium-doped fiber amplifier (EDFA) applications requiring stable component supply, extended temperature support, and long-term industrial lifecycle assurance.

Supply support for AD4682BCPZ-RL 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.

The AD4682BCPZ-RL belongs to Analog Devices' precision SAR ADC portfolio, engineered for simultaneous dual-channel acquisition in demanding real-time control and measurement systems where timing integrity, noise immunity, and functional integration are critical.

FAQ

What is the maximum sampling rate supported by the AD4682BCPZ-RL?

The AD4682BCPZ-RL supports a maximum throughput conversion rate of 1 MSPS, as confirmed in the Rev. A datasheet Table 2. This rate applies under standard operating conditions (VCC = 3.3 V, TA = −40°C to +125°C, no oversampling enabled). At this rate, the minimum time between conversions (tCYC) is 1 µs, and the conversion time (tCONVERT) is 190 ns. The AD4682BCPZ-RL is specifically rated for 1 MSPS - unlike the pin-compatible AD4683BCPZ-RL, which is limited to 500 kSPS.

Does the AD4682BCPZ-RL include an internal voltage reference?

Yes, the AD4682BCPZ-RL integrates a buffered 2.5 V internal reference with ±10 mV initial accuracy and 5–10 ppm/°C temperature coefficient, accessible via the REFIO pin. The REFCAP pin requires a 0.1 µF decoupling capacitor. When using the internal reference, the REFSEL bit in the CONFIGURATION1 register must be set to 0. External references from 2.5 V to 3.3 V are also supported by setting REFSEL = 1 and applying appropriate decoupling.

How does the oversampling feature improve performance in the AD4682BCPZ-RL?

The AD4682BCPZ-RL implements a rolling-average oversampling block that increases effective resolution and SNR. With OSR = ×8 and RES = 1 enabled, SNR improves from 87.5 dB to 93.4 dB - a 5.9 dB gain corresponding to ~1 additional bit of effective resolution. This reduces need for external digital filtering in applications like power quality analysis, where enhanced dynamic range at lower bandwidths is critical for detecting low-level harmonics.

What is the function of the SDOB/ALERT pin on the AD4682BCPZ-RL?

The SDOB/ALERT pin on the AD4682BCPZ-RL is a multifunction terminal that operates either as Serial Data Output B (for ADC B results) or as an active-low Alert indicator. Alert mode is enabled by setting ALERT_EN = 1 in CONFIGURATION1 and SDO = 1 in CONFIGURATION2. When triggered, the pin asserts low within 220 ns of CS falling edge if conversion results exceed user-defined high/low thresholds stored in ALERT_HIGH_THRESHOLD and ALERT_LOW_THRESHOLD registers.

What package type and thermal characteristics does the AD4682BCPZ-RL use?

The AD4682BCPZ-RL uses a 3 mm × 3 mm, 16-lead LFCSP package (CP-16-451) with exposed pad (EPAD). Its thermal resistance is θJA = 55.4°C/W (natural convection, JEDEC 2S2P board) and θJC = 12.7°C/W. The EPAD must be soldered to PCB ground for optimal thermal performance and EMI suppression. Absolute maximum junction temperature is 150°C, and operating ambient range is −40°C to +125°C.