Analog Devices Inc. AD7770ACPZ-RL

Overview

AD7770ACPZ-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 and low-power). It supports true differential or single-ended inputs, delivers 103 dB dynamic range at 32 kSPS, and operates from −40°C to +105°C. It is used in protection relays and industrial process control systems requiring synchronized multi-channel precision acquisition.

For engineers reviewing the AD7770ACPZ-RL datasheet, AD7770ACPZ-RL pinout, AD7770ACPZ-RL application, or AD7770ACPZ-RL equivalent, key selection considerations include simultaneous sampling integrity, ±4 nA differential input bias current, sinc3 filter latency, SRC programmability for coherent line-frequency sampling, and SAR-assisted diagnostics without channel decommissioning.

Technical Context

The AD7770ACPZ-RL integrates eight independent Σ-Δ modulators with sinc3 digital filters and a sample rate converter (SRC) enabling fine ODR resolution down to 15.2 × 10⁻⁶ SPS. Each channel includes a capacitive PGA with selectable gain and configurable input topology (true differential, pseudo-differential, or single-ended).

It implements two dedicated digital interfaces: a high-speed data output interface (DOUTx/DRDY) for Σ-Δ conversion results and a full SPI interface for register configuration, diagnostics, and SAR ADC readback. The embedded 12-bit SAR ADC supports system-level validation via GPIO-controlled external multiplexers and internal node monitoring.

Key Specifications

Pinout & Package

AD7770ACPZ-RL is housed in a 64-lead LFCSP (9 mm × 9 mm, 0.85 mm height) with exposed thermal pad. Pin assignments follow Analog Devices' standard layout for signal isolation, power domain separation (AVDD1x/AVDD2x/AVDD4/DGND/IOVDD), and dedicated synchronization I/O (START, SYNC_IN, SYNC_OUT, DRDY).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7779ACPZ, AD7770ACPZ-RL adds SRC-based coherent sampling and SAR-assisted diagnostics-critical for protection relay certification. Versus LTC2358ILX-18#PBF, it trades raw speed for 6-bit effective resolution advantage and inherent antialiasing, making it superior for steady-state power system monitoring.

Availability

AD7770ACPZ-RL is available at Aetrix Electronics and suitable for protection relays, industrial process control systems, and power quality analyzers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for safety-critical deployments.

Supply support for AD7770ACPZ-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 AD7770ACPZ-RL belongs to Analog Devices' precision Σ-Δ ADC product line, engineered specifically for synchronized multi-channel data acquisition in electric utility infrastructure, factory automation, and functional safety–compliant instrumentation.

FAQ

What is the maximum simultaneous sampling rate supported by the AD7770ACPZ-RL?

The AD7770ACPZ-RL supports up to 32 kSPS per channel in high-resolution mode, delivering synchronized 24-bit samples across all eight channels. This rate is maintained with full dynamic range (103 dB) and meets timing specifications for coherent sampling when combined with the integrated sample rate converter (SRC). The device sustains this performance across its full operating temperature range of −40°C to +105°C.

Does the AD7770ACPZ-RL require an external reference voltage?

No, the AD7770ACPZ-RL includes an internal 2.5 V reference with ±10 ppm/°C typical temperature coefficient and 2.495 V to 2.505 V initial accuracy. External reference operation is optional and supported over 1 V to 3.6 V, but the internal reference eliminates BOM cost and board area in most industrial applications. Reference buffer enable/disable is software-configurable via SPI registers.

How does the SAR ADC in the AD7770ACPZ-RL support functional safety compliance?

The embedded 12-bit SAR ADC in the AD7770ACPZ-RL provides an independent diagnostic path that operates concurrently with the primary Σ-Δ channels. It can validate sensor signal integrity and Σ-Δ conversion accuracy using internal node sensing or external multiplexer routing (controlled via GPIO0–GPIO2), satisfying IEC 61508 diagnostic coverage requirements without disabling measurement functionality - a key enabler for SIL-2 system certification.

What package type and thermal characteristics apply to the AD7770ACPZ-RL?

The AD7770ACPZ-RL uses a 64-lead LFCSP package (9 mm × 9 mm, 0.85 mm height) with exposed thermal pad. With 49 thermal vias, its junction-to-board thermal resistance (θJB) is 3.17°C/W and junction-to-ambient (θJA) is 22.62°C/W. This enables reliable operation at full performance up to +105°C ambient, provided PCB layout follows Analog Devices' recommended copper pour and via placement guidelines.

Can the AD7770ACPZ-RL interface directly with an FPGA without level-shifting?

Yes - the AD7770ACPZ-RL supports digital I/O supply (IOVDD) from 1.8 V to 3.6 V, matching common FPGA I/O standards including 1.8 V, 2.5 V, and 3.3 V. Its logic inputs accept VIH ≥ 0.7 × IOVDD and VIL ≤ 0.4 V, while outputs drive VOH ≥ 0.8 × IOVDD and VOL ≤ 0.4 V under specified load conditions. No level-shifting is required when IOVDD matches the FPGA's I/O bank voltage.