AD7770ACPZ

Overview

The AD7770ACPZ is an 8-channel, 24-bit simultaneous sampling analog-to-digital converter (ADC) utilizing sigma-delta architecture. It features a programmable gain amplifier (PGA) with gains of 1, 2, 4, and 8 per channel, supporting up to 32 kSPS output data rates in high-resolution mode. The device accepts unipolar or true bipolar analog inputs via single-ended or differential configurations. It includes an internal 2.5 V reference, a sample rate converter (SRC), and a dedicated 12-bit SAR ADC for diagnostics. Power supplies include ±1.65 V or 3.3 V analog rails and 1.8 V to 3.6 V digital I/O. It operates within a functional temperature range of −40°C to +125°C.

Feature Summary

• Eight independent sigma-delta channels with simultaneous sampling capability
• Integrated low-latency sinc3 digital filter with programmable sample rate converter
• Internal 12-bit SAR ADC for system monitoring and self-diagnostic validation
• Adjustable phase synchronization and configurable input signal formats

Applications

• Protection relays
• General-purpose data acquisition systems
• Industrial process control

Procurement Notes

Verify the specific package variant against the required thermal management strategy, as the LFCSP-64 package performance depends on PCB thermal vias. Confirm that the ordering suffix matches the intended packaging format, such as tray or reel, by consulting the manufacturer's official ordering guide. Ensure all electrical supply requirements align with the specified voltage ranges before finalizing procurement.

Selection Notes

Select this component when simultaneous multi-channel sampling at high resolution is required. The integrated PGA allows direct connection to low-level sensors without external amplification. Consider the power modes; high-resolution mode offers superior dynamic range, while low-power mode reduces consumption. Verify that the SPI interface timing meets the host processor's capabilities for register configuration and data retrieval.

Part Context

The AD7770 belongs to the AD777x family of high-performance data converters from Analog Devices. This series is designed for applications demanding precise, synchronized multi-channel measurements. The ACPZ suffix indicates the Lead-free LFCSP-64 package variant. It serves as a complete analog front end, integrating modulation, filtering, and reference circuitry to simplify system design for industrial and utility metering applications.

Replacement Considerations

The AD7771 is a pin-compatible alternative offering higher resolution and lower noise specifications. The AD7779 provides similar functionality but may differ in specific power consumption profiles and diagnostic features. Evaluate these options based on whether enhanced accuracy or different power characteristics are required for the target application.