Analog Devices Inc. AD4683BCPZ-RL

Overview

AD4683BCPZ-RL from Analog Devices is a dual, simultaneous-sampling, 16-bit pseudo-differential SAR ADC operating at 500 kSPS with 2.5 V internal reference, ±2.5 LSB INL max, and 3 mm × 3 mm 16-lead LFCSP package - designed for high-precision motor current sensing and power quality monitoring in industrial control systems.

For engineers reviewing the AD4683BCPZ-RL datasheet, AD4683BCPZ-RL pinout, AD4683BCPZ-RL application, or AD4683BCPZ-RL equivalent, this page delivers verified specifications, real-world timing behavior (tACQUIRE = 1810 ns, tQUIET = 1500 ns), oversampling-enabled SNR up to 93.4 dB, and validated alternative selection guidance for dual-channel precision data acquisition.

Technical Context

The AD4683BCPZ-RL implements two independent successive approximation register (SAR) cores with shared serial interface and on-chip oversampling logic, enabling rolling-average noise reduction at OSR ×8 with RES = 1. Its pseudo-differential input structure requires AINA−/AINB− biased at VREF/2 (1.25 V nominal) while accepting 0 V to VREF (2.5 V or 3.3 V) on AINA+/AINB+.

Conversion is initiated by CS falling edge, sampled on that edge, and completed in 190 ns (tCONVERT); data is read via SPI with SDOA/SDOB outputs supporting twos-complement format, 1.65 V–3.6 V logic compatibility, and ALERT function configurable via CONFIGURATION1/CONFIGURATION2 registers.

Key Specifications

Pinout & Package

AD4683BCPZ-RL uses a 3 mm × 3 mm, 16-lead LFCSP (CP-16-451) with exposed pad (EPAD) requiring PCB ground connection. Pin functions are validated per Analog Devices Rev. A datasheet Figure 6 and Table 7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD4683BCPZ-RL, AD4682BCPZ-RL offers higher speed at increased power cost, while AD7383BCPZ-RL7 sacrifices oversampling and alert functionality for lower unit cost - making AD4683BCPZ-RL the optimal balance of precision, integrated features, and thermal efficiency for industrial DAQ.

Availability

AD4683BCPZ-RL is available at Aetrix Electronics and suitable for motor control position feedback, power quality monitoring, and sonar signal digitization requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.

Supply support for AD4683BCPZ-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 AD468x family was designed specifically for high-accuracy, dual-channel simultaneous sampling in demanding industrial automation and energy infrastructure applications - emphasizing thermal stability, low-latency deterministic timing, and integrated signal conditioning features.

FAQ

What is the maximum sampling rate of the AD4683BCPZ-RL?

The AD4683BCPZ-RL has a fixed maximum throughput conversion rate of 500 kSPS per channel, confirmed in Table 2 of the Rev. A datasheet. This rate is achieved with tCYC = 2 µs between conversions and supports simultaneous sampling across both ADC A and ADC B without interleaving or latency penalties. The AD4683BCPZ-RL does not support programmable sample rates above this value.

Does the AD4683BCPZ-RL include an internal voltage reference?

Yes, the AD4683BCPZ-RL integrates a buffered 2.5 V internal reference with ±10 ppm/°C temperature coefficient and 7 µV rms noise, accessible via the REFIO pin. It can be used directly or overridden by an external 2.5 V–3.3 V reference; the REFSEL bit in CONFIGURATION1 register controls selection, and REFCAP requires a 0.1 µF decoupling capacitor.

How does the oversampling feature improve performance in the AD4683BCPZ-RL?

The AD4683BCPZ-RL implements rolling-average oversampling with configurable OSR up to ×8, improving SNR from 87.5 dB to 93.4 dB and enabling 18-bit effective resolution. This reduces system-level noise filtering requirements and supports lower-bandwidth applications such as power metering or sensor signal conditioning without external DSP resources.

What is the purpose of the SDOB/ALERT pin on the AD4683BCPZ-RL?

The SDOB/ALERT pin on the AD4683BCPZ-RL serves dual roles: as SDOB, it outputs conversion results from ADC B; as ALERT, it asserts low when a channel's result exceeds user-defined thresholds stored in ALERT_LOW_THRESHOLD and ALERT_HIGH_THRESHOLD registers. Activation requires setting ALERT_EN = 1 in CONFIGURATION1 and SDO = 1 in CONFIGURATION2.

Is the AD4683BCPZ-RL compatible with 1.8 V logic interfaces?

Yes, the AD4683BCPZ-RL supports 1.65 V–3.6 V logic supply (VLOGIC), fully covering 1.8 V, 2.5 V, and 3.3 V digital interfaces. Input thresholds scale with VLOGIC (VIH = 0.8 × VLOGIC, VIL = 0.2 × VLOGIC), and output drive strength is specified down to 1.65 V, ensuring reliable SPI communication with modern low-voltage microcontrollers and FPGAs.