AD9057BRS-40

Overview

The AD9057BRS-40 is an 8-bit monolithic analog-to-digital converter (ADC) from Analog Devices, optimized for low cost and power consumption. It features a full-power analog bandwidth of 120 MHz and operates at a maximum conversion rate of 40 MSPS. The device integrates an internal 2.5 V reference and track-and-hold circuit, requiring only a single 5 V analog supply and a TTL/CMOS compatible encode clock. Digital outputs support 3 V or 5 V logic interfaces via the VDD pin. Power dissipation is typically 192 mW at 25°C with a 3 V digital supply, dropping below 10 mW in power-down mode. It is housed in a 20-lead SSOP package and specified over the industrial temperature range of –40°C to +85°C.

Feature Summary

• Combines MagAmp gray code conversion with flash converter architecture for high performance and low power.
• Includes an on-chip 2.5 V bandgap reference and track-and-hold circuit to minimize external component requirements.
• Supports flexible digital logic interfacing with both 3 V and 5 V CMOS/TTL systems through the isolated VDD supply pin.
• Features a dedicated power-down function that reduces total power consumption to less than 10 mW.

Applications

• Digital Communications (QAM Demodulators)
• RGB and YC/Composite Video Processing
• Digital Data Storage Read Channels
• Medical Imaging
• Digital Instrumentation

Procurement Notes

Verify the specific grade suffix (-40) corresponds to the 40 MSPS maximum conversion rate requirement. Confirm the RS-20 package option matches the PCB footprint design. Ensure the operating environment stays within the –40°C to +85°C industrial temperature range. Check that the system provides a stable 5 V analog supply and appropriate logic levels for the VDD pin. Validate ESD handling procedures during assembly due to the device's sensitivity.

Selection Notes

Select this model when a fixed 40 MSPS sampling rate is sufficient, offering potential cost advantages over higher-speed grades. Consider the AD9057BRS-60 or AD9057BRS-80 if higher throughput or wider dynamic performance at elevated frequencies is required. Evaluate the need for external versus internal voltage references based on gain accuracy and temperature stability requirements. Assess power constraints to determine if the standard operation or power-down mode meets system energy goals.

Part Context

The AD9057BRS-40 belongs to the AD9057 family of 8-bit ADCs, which also includes the 60 MSPS and 80 MSPS variants. These devices share the same core architecture, pinout, and functional block diagram, differing primarily in their guaranteed maximum encoding rates and associated dynamic performance specifications. The family is designed for applications requiring small size and ease of use with minimal external support circuitry.

Replacement Considerations

Direct substitutes include the AD9057BRS-60 and AD9057BRS-80, which offer identical pinouts and functionality but with higher maximum sampling rates of 60 MSPS and 80 MSPS respectively. Verify that the system timing margins accommodate the potentially different propagation delays or jitter characteristics if upgrading to a faster grade. No other part numbers are confirmed as direct replacements in the provided documentation.