Analog Devices Inc. AD4680BCPZ-RL

Overview

AD4680BCPZ-RL from Analog Devices is a 16-bit, dual simultaneous sampling, differential-input SAR ADC with 1 MSPS throughput, 92.5 dB SNR (VREF = 3.3 V), ±1.5 LSB INL max, and integrated 2.5 V reference (10 ppm/°C). It operates from −40°C to +125°C in motor control current sensing and power quality monitoring systems.

For engineers reviewing the AD4680BCPZ-RL datasheet, AD4680BCPZ-RL pinout, AD4680BCPZ-RL application, or AD4680BCPZ-RL equivalent, key selection criteria include dual-channel simultaneous sampling accuracy, oversampling-enabled dynamic range enhancement, alert-triggered threshold detection, and LFCSP-16 package compatibility with high-density industrial PCB layouts.

Technical Context

The AD4680BCPZ-RL implements two independent SAR cores with fully differential analog inputs (AINA±, AINB±), sampled on the falling edge of CS. Its on-chip oversampling block supports OSR up to 8×, delivering 100 dB dynamic range at RES = 1, while resolution boost mode enables 18-bit output with corresponding LSB scaling.

It features a buffered internal 2.5 V reference (10 ppm/°C) and accepts external references from 2.5 V to 3.3 V via REFIO. The serial interface supports 1.8 V/2.5 V/3.3 V logic levels via separate VLOGIC supply and includes dedicated SDOA/SDOB outputs plus ALERT functionality on pin 14.

Key Specifications

Pinout & Package

AD4680BCPZ-RL uses a 3 mm × 3 mm, 16-lead lead-frame chip-scale package (LFCSP) with exposed thermal pad (EPAD) requiring connection to PCB ground for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7380BCPZ-RL7, AD4680BCPZ-RL provides guaranteed inter-channel timing alignment and embedded reference/oversampling-reducing BOM count and layout complexity. Versus AD4630-24BCPZ-RL7, it trades resolution for speed and adds hardware alerting, making it better suited for closed-loop motor control where latency and event response matter more than microvolt-level static accuracy.

Availability

AD4680BCPZ-RL is available at Aetrix Electronics and suitable for motor control position feedback, power quality monitoring, and sonar signal acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD4680BCPZ-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 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 AD4680BCPZ-RL belongs to Analog Devices' high-speed precision SAR ADC product line, designed specifically for demanding real-time control and measurement applications requiring simultaneous dual-channel acquisition, low latency, and robust operation in harsh environments.

FAQ

What is the maximum sampling rate supported by the AD4680BCPZ-RL?

The AD4680BCPZ-RL supports a maximum throughput rate of 1 MSPS for both channels simultaneously. This is confirmed in the datasheet's Specifications table (Rev. A, p.3), where "THROUGHPUT" for AD4680 is listed as 1 MSPS. The timing parameter tCYC (time between conversions) is specified as 1 µs, directly validating the 1 MSPS capability. This rate applies under standard operating conditions: VCC = 3.0–3.6 V, VLOGIC = 1.65–3.6 V, and TA = −40°C to +125°C.

Does the AD4680BCPZ-RL include an internal voltage reference?

Yes, the AD4680BCPZ-RL integrates a buffered 2.5 V internal reference with a temperature coefficient of 10 ppm/°C (min/max 1 ppm/°C typical). As stated in the General Description and Specifications sections (Rev. A, pp.1, 4), this reference is accessible via the REFIO pin and can be used directly or disabled in favor of an external 2.5–3.3 V source. The REFIO pin requires mandatory decoupling with a 1 µF capacitor to GND for stability, whether internal or external reference is selected.

How does the oversampling feature improve performance in the AD4680BCPZ-RL?

The AD4680BCPZ-RL's oversampling function improves dynamic range by averaging multiple samples per output word. At OSR = 8× and RES = 1, the datasheet specifies a 100 dB dynamic range (Rev. A, p.3), a 7.5 dB improvement over the base 92.5 dB SNR. This occurs because oversampling reduces quantization noise power by the OSR factor and shifts noise energy out of the band of interest. The feature is implemented in hardware, requiring only register configuration - no host processor overhead - and is validated across temperature and supply variations.

What is the purpose of the SDOB/ALERT pin on the AD4680BCPZ-RL?

The SDOB/ALERT pin (Pin 14) is a multifunction terminal that operates either as Serial Data Output B or as an active-low Alert indicator. When configured as ALERT, it asserts low when a conversion result exceeds user-programmed high or low thresholds stored in ALERT_HIGH_THRESHOLD and ALERT_LOW_THRESHOLD registers. This hardware-level event detection eliminates polling overhead and enables immediate system response - for example, triggering fault shutdown in motor control before damage occurs. Configuration is done via the CONFIGURATION2 register.

Is the AD4680BCPZ-RL pin-compatible with the AD4681BCPZ-RL?

Yes, the AD4680BCPZ-RL and AD4681BCPZ-RL are explicitly described as pin-compatible in the General Description (Rev. A, p.1): "The AD4680/AD4681 are 16-bit, pin-compatible, dual simultaneous sampling… SAR ADCs." Both share identical pinout, package (16-lead LFCSP), and interface protocol. The primary functional difference is throughput: AD4680BCPZ-RL delivers 1 MSPS, while AD4681BCPZ-RL operates at 500 kSPS. This allows direct substitution where speed requirements permit, without PCB redesign.