AD9057BRS-60

Overview

The AD9057BRS-60 is an 8-bit monolithic analog-to-digital converter (ADC) optimized for low cost, low power, and small size. It features a 60 MSPS maximum conversion rate and a full-power analog bandwidth of 120 MHz. The device includes an internal 2.5 V reference and track-and-hold circuit, requiring only a single 5 V supply and an encode clock. It operates over the industrial temperature range (-40°C to +85°C). Typical power dissipation is 205 mW at 3 V digital logic, with a power-down mode consuming less than 10 mW. The component utilizes a parallel interface and is housed in a 20-lead SSOP package.

Feature Summary

• Combines MagAmp gray code conversion with flash converter technology for high performance.
• Integrates an on-chip 2.5 V voltage reference and track-and-hold circuit.
• Supports direct IF sampling techniques to simplify receiver architectures.
• Features TTL/CMOS compatible inputs and 3 V or 5 V logic output interfaces.

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 speed grade suffix matches the required 60 MSPS encoding rate. Confirm the RS-20 package option aligns with PCB footprint requirements. Ensure the industrial temperature rating meets system environmental specifications. Check for ESD sensitivity precautions during handling. Validate that the single-ended input architecture fits the signal source design.

Selection Notes

Select this model when a 60 MSPS sample rate is required within the AD9057 family. Consider the AD9057BRS-40 for lower speed needs or the AD9057BRS-80 for higher bandwidth applications. Evaluate the dual-channel AD9059 if multichannel digitization is necessary. Assess power constraints against the typical 205 mW dissipation figure. Verify compatibility with 3 V or 5 V digital logic systems for the output stage.

Part Context

The AD9057 series represents Analog Devices' entry-level high-speed ADC line, utilizing BiCMOS process technology. It serves as the single-channel counterpart to the dual-channel AD9059. The device is designed to minimize external component count by integrating biasing and reference circuits. It targets applications demanding moderate resolution with high dynamic performance at reduced system costs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout and electrical parameter compatibility before considering alternative manufacturers or upgraded series components.

FAQ

How is the analog input biased for AC coupling?

For AC coupling, the analog input bias current is derived from the ADC's internal voltage reference through a 1 kΩ resistor connected to the BIAS OUT pin.

What is the effect of the PWRDN pin on digital outputs?

Driving the PWRDN pin high activates power-down mode, causing the digital outputs to enter a high impedance state and reducing total power consumption to less than 10 mW.

Can the internal reference be bypassed for external use?

Yes, an external voltage can be applied to the VREF IN pin while disconnecting VREF OUT to adjust ADC gain and offset simultaneously.