Analog Devices Inc. AD7779ACPZ-RL

Overview

AD7779ACPZ-RL from Analog Devices is an 8-channel, 24-bit simultaneous sampling sigma-delta ADC with per-channel programmable gain amplifiers (gains of 1, 2, 4, 8), internal 2.5 V reference, and dual operating modes (high resolution: 108 dB SNR at 16 kSPS; low power: 3.37 mW/channel). It supports true differential or single-ended inputs and is used in high-precision EEG systems and industrial process control where channel-to-channel phase coherence and ultra-low input bias current (±1.5 nA differential) are critical.

For engineers reviewing the AD7779ACPZ-RL datasheet, AD7779ACPZ-RL pinout, AD7779ACPZ-RL application, or AD7779ACPZ-RL equivalent, key selection considerations include simultaneous sampling integrity, sinc3 filter latency, sample rate converter (SRC) resolution down to 15.2 µSPS, ±7 ppm INL, and functional operation up to +125°C for circuit breaker monitoring and diagnostic SAR ADC integration.

Technical Context

The AD7779ACPZ-RL integrates eight independent Σ-Δ modulators with sinc3 digital filters and a dedicated 12-bit SAR ADC for diagnostics-enabling concurrent high-accuracy measurement and self-validation without sacrificing a main channel. Its SRC allows fine-grained ODR tuning (e.g., coherent 50/60 Hz line monitoring), while adjustable phase synchronization ensures precise multi-device timing alignment.

It operates from bipolar (±1.65 V) or unipolar (3.3 V) analog supplies and 1.8–3.6 V I/O supply, with two power modes: high resolution mode (10.75 mW/channel, 108 dB SNR) and low power mode (3.37 mW/channel, 106 dB SNR). The internal 2.5 V reference exhibits ±10 ppm/°C drift and supports external buffering or bypassing.

Key Specifications

Pinout & Package

AD7779ACPZ-RL is housed in a 64-lead LFCSP (9 mm × 9 mm, 0.8 mm pitch) with exposed thermal pad. Pin functions are defined per Analog Devices Rev. F datasheet Section "Pin Configuration and Function Descriptions" (p. 14).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel precision ADC applications.

Compared with AD7779ACPZ-RL, AD7768-1ACPZ-RL trades channel count and flexibility for higher speed and lower power in single-input systems, while LTC2378-20IUK#PBF offers raw throughput at the expense of simultaneous sampling integrity, diagnostic capability, and sub-ppm linearity-making AD7779ACPZ-RL uniquely suited for safety-critical, multi-sensor coherence-dependent designs.

Availability

AD7779ACPZ-RL is available at Aetrix Electronics and suitable for circuit breaker monitoring, electroencephalography (EEG), and industrial process control requiring stable component supply, long-term lifecycle support, and guaranteed performance across extended temperature ranges.

Supply support for AD7779ACPZ-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 since 1965.

The AD7779ACPZ-RL belongs to Analog Devices' precision Σ-Δ ADC product line, engineered specifically for applications demanding simultaneous multi-channel acquisition, ultra-low input current, and integrated diagnostics-such as functional safety–compliant energy metering and medical biosignal acquisition.

FAQ

What is the maximum simultaneous sampling rate supported by the AD7779ACPZ-RL?

The AD7779ACPZ-RL supports up to 16 kSPS per channel in high resolution mode, with all eight channels sampled simultaneously. This rate is maintained across the full 24-bit resolution and is validated under specified conditions (MCLK = 8192 kHz, AVDD1x = ±1.65 V or 3.3 V, T = −40°C to +105°C). Lower rates (e.g., 4 kSPS) are available in low power mode to reduce consumption to 3.37 mW per channel while retaining simultaneous operation.

Does the AD7779ACPZ-RL include an internal voltage reference, and can it be disabled?

Yes, the AD7779ACPZ-RL integrates a 2.5 V internal reference with ±0.2% initial accuracy and ±10 ppm/°C typical temperature coefficient. It can be disabled via configuration registers to allow use of an external reference (1 V to 3.6 V), enabling ratiometric measurements or improved system-level accuracy. Disabling the internal reference reduces typical current consumption by ~40 µA.

How does the sample rate converter (SRC) function in the AD7779ACPZ-RL?

The SRC in the AD7779ACPZ-RL provides fine-resolution control over the output data rate, allowing programmable ODR steps as small as 15.2 µSPS. It operates independently per channel and is updated via SPI or GPIO triggers. This enables coherent sampling for power quality analysis (e.g., exact integer cycles per second at 50/60 Hz) without requiring crystal-locked master clocks.

What is the role of the integrated 12-bit SAR ADC in the AD7779ACPZ-RL?

The integrated 12-bit SAR ADC in the AD7779ACPZ-RL serves exclusively for diagnostics and system validation. It operates independently of the eight Σ-Δ channels and can monitor internal nodes or external signals (via GPIO-controlled multiplexer) to verify Σ-Δ channel integrity-supporting functional safety requirements (e.g., IEC 61508) without decommissioning primary measurement resources.

What package type and thermal characteristics apply to the AD7779ACPZ-RL?

The AD7779ACPZ-RL uses a 64-lead LFCSP package (9 mm × 9 mm, 0.8 mm pitch) with exposed thermal pad. With 49 thermal vias, its junction-to-ambient thermal resistance (θJA) is 22°C/W. The device supports operation up to +125°C junction temperature, and its thermal design must follow Analog Devices' layout guidelines-including recommended copper area, via count, and solder paste stencil specifications-to maintain performance within datasheet limits.