Analog Devices Inc. AD7768-1BCPZ-RL

Overview

AD7768-1BCPZ-RL from Analog Devices is a single-channel, low-power, high-precision Σ-Δ analog-to-digital converter optimized for dynamic signal analysis in precision data acquisition systems. It delivers 108.5 dB typical dynamic range, ±1.1 ppm FSR INL, −120 dB THD, and supports programmable ODR up to 1024 kSPS with selectable sinc5, sinc3, or low-ripple FIR filtering - enabling use in clinical EEG/ECG monitoring and predictive maintenance condition monitoring.

For engineers reviewing the AD7768-1BCPZ-RL datasheet, AD7768-1BCPZ-RL pinout, AD7768-1BCPZ-RL application, or AD7768-1BCPZ-RL equivalent, key selection considerations include its 28-lead LFCSP package, 3 V to 5 V dual analog supply operation, 1.8 V–3.3 V I/O voltage compatibility, configurable power scaling across fast/median/low-power modes, and integrated diagnostic features including CRC and temperature monitoring.

Technical Context

The AD7768-1BCPZ-RL implements a Σ-Δ modulator core with three user-selectable digital filter paths: low-latency sinc5 (up to 1.024 MHz ODR), programmable sinc3 with 50 Hz/60 Hz rejection, and low-ripple FIR (±0.005 dB passband ripple, DC–102.4 kHz). Each path supports independent decimation control and latency optimization.

It integrates precharge buffers on analog inputs and reference inputs to reduce external drive requirements, supports true bipolar analog supplies (AVDD1–AVSS = 5 V, AVDD2–AVSS = 2–5 V), and operates from a single 3.0 V rail in low-power mode. Digital interface is configurable via pin control or SPI with CRC-protected serial communication.

Key Specifications

Pinout & Package

Package: 28-lead, 4 mm × 5 mm, lead-frame chip-scale package (LFCSP) with exposed paddle for thermal performance and compact PCB layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision sigma-delta ADC applications.

Compared with AD7768BCPZ-RL, the AD7768-1BCPZ-RL reduces PCB area and system power by 75% for single-channel use; versus ADS127L11IPWR, it adds critical 50/60 Hz rejection and three-tier power scaling - making it superior for industrial and clinical AC-line-noise-sensitive applications.

Availability

AD7768-1BCPZ-RL is available at Aetrix Electronics and suitable for clinical vital signs monitoring, predictive maintenance condition monitoring, and modular USB/PXI-based data acquisition requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD7768-1BCPZ-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, founded in 1965 and headquartered in Wilmington, MA.

The AD7768-1BCPZ-RL belongs to Analog Devices' precision data acquisition portfolio, designed specifically to unify ac and dc performance in low-power, reconfigurable DAQ platforms for instrumentation, industrial automation, and healthcare systems.

FAQ

What is the maximum output data rate (ODR) supported by the AD7768-1BCPZ-RL?

The AD7768-1BCPZ-RL supports up to 1024 kSPS using the sinc5 filter with MCLK = 16.384 MHz. This highest-speed mode delivers 52.224 kHz input bandwidth at 26.4 mW. Lower ODRs down to 1 kSPS are achievable in median and low-power FIR modes - all programmable via register writes or pin strapping. The AD7768-1BCPZ-RL's decimation engine allows fine-grained ODR selection across eight sinc5 and six FIR decimation rates.

Does the AD7768-1BCPZ-RL support 50 Hz and 60 Hz line frequency rejection?

Yes, the AD7768-1BCPZ-RL includes a fully programmable sinc3 filter that can be configured to reject either 50 Hz or 60 Hz interference with complete settling in ≤60 ms. This capability is implemented in hardware and does not require external filtering or DSP post-processing. The AD7768-1BCPZ-RL's sinc3 path is especially valuable in ECG, EEG, and industrial sensor applications where mains noise dominates the signal band.

What power supply configurations does the AD7768-1BCPZ-RL support?

The AD7768-1BCPZ-RL supports split analog supplies: AVDD1–AVSS = 4.5–5.5 V (or 3 V in low-power mode), AVDD2–AVSS = 2.0–5.5 V, and IOVDD–DGND = 1.7–3.6 V. In low-power mode, all supplies (AVDD1, AVDD2, IOVDD) may be tied to a single 3.0 V rail. The device also supports true bipolar analog input ranges when AVSS is biased below DGND, enabling direct measurement of negative signals without level-shifting circuitry.

How does the AD7768-1BCPZ-RL handle analog input drive requirements?

The AD7768-1BCPZ-RL integrates a precharge buffer on each analog input, limiting typical input current to ±20 µA - significantly lower than competing sigma-delta ADCs without this feature. This reduces external amplifier loading and enables direct connection to high-impedance sources like piezoelectric sensors or thermopiles. The AD7768-1BCPZ-RL's input current scales predictably with MCLK frequency and power mode, allowing precise drive-stage sizing during design.

Can multiple AD7768-1BCPZ-RL devices be synchronized for coherent sampling?

Yes, the AD7768-1BCPZ-RL includes dedicated SYNC_IN and SYNC_OUT pins to align conversion timing across multiple devices. When configured in master/slave topology, the SYNC_IN signal triggers simultaneous sampling across all linked AD7768-1BCPZ-RL units - essential for phase-accurate multi-channel DAQ in power analyzers or acoustic beamforming arrays. Synchronization is deterministic and does not rely on software coordination or external FPGA logic.