5962-8776202VX

Overview

The AD7575 is an 8-bit successive approximation analog-to-digital converter featuring a built-in track-and-hold circuit. It operates from a single +5 V supply and achieves a fast conversion time of 5 µs with a full power signal bandwidth of 50 kHz. The device requires a 1.23 V reference voltage for a 0 to 2.46 V input range. Key electrical parameters include a total unadjusted error of 1 LSB, 100 ns data access time, and typical power dissipation of 15 mW.

Feature Summary

• Integrated on-chip track-and-hold function eliminates the need for external hold capacitors.
• Fast 5 µs conversion time suitable for audio and ultrasonic frequency digitization.
• Low total unadjusted error ensures accuracy without requiring offset or gain adjustments.
• Single +5 V supply operation simplifies integration into standard microprocessor systems.

Applications

• Digitizing wideband signals at audio frequencies.
• Ultrasonic signal processing applications.
• Interfacing with popular 8-bit microprocessors like Z80 and 8085.
• Data acquisition systems requiring low power consumption.
• DSP processor interfaces such as the TMS32010.

Procurement Notes

Verify the specific temperature grade (J/K, A/B, S/T) and package type (DIP, SOIC, PLCC, LCCC) required for the application, as performance specifications vary by version. Confirm availability status, as this component may be discontinued or subject to limited supply constraints depending on the manufacturer's current production schedule.

Selection Notes

Select the appropriate temperature range variant based on environmental conditions: commercial (0°C to +70°C), industrial (-25°C to +85°C), or extended (-55°C to +125°C). Ensure the interface logic matches the target microprocessor architecture, utilizing either Slow Memory or ROM interface modes. Verify that the system clock frequency aligns with the specified 4 MHz requirement for optimal accuracy.

Part Context

The AD7575 belongs to the Analog Devices LC2MOS family of high-speed ADCs. It is designed for easy interfacing with standard microprocessors using common control signals. The device is fabricated in an all ion-implanted high-speed Linear Compatible CMOS process, offering a balance of speed, low power, and cost-effectiveness for general-purpose data conversion tasks.

Replacement Considerations

Direct replacements must match the 8-bit resolution, 5 µs conversion time, and single +5 V supply requirements. Verify pin compatibility for DIP-18, SOIC-18, PLCC-20, or LCCC-20 packages. Consider alternative SAR ADCs with integrated track-and-hold if exact form-factor substitution is not feasible.

FAQ

How is the sampling instant determined in the AD7575?

The input signal is held on the third falling edge of the input clock after the CS and RD control signals go LOW.

Can the AD7575 operate with an internal clock?

Yes, it can use an internal clock generated by an external resistor and capacitor, though an external clock is recommended for precise timing control.

What is the maximum slew rate the track-and-hold can handle?

The on-chip track-and-hold can handle signals with slew rates up to 386 mV/ms, allowing full accuracy for 50 kHz sine waves.