AD7669JPZ

Specialized Overview

The AD7669JPZ is an 8-bit analog I/O system on a single monolithic chip, featuring a successive approximation ADC with a 2 μs conversion time and a DAC with a 1 μs settling time. It includes a track/hold circuit with 200 kHz bandwidth and an on-chip bandgap reference. The device supports single or dual 5 V supplies, enabling unipolar (0 to +1.25 V/+2.5 V) or bipolar (±1.25 V/±2.5 V) ranges via the RANGE pin. Digital interfacing uses an 8-bit parallel port compatible with standard microprocessors. It is housed in a 28-pin PLCC package.

Specialized Feature Summary

• Complete analog I/O integration on a single chip eliminates external component requirements.
• Fast bus interface timing allows easy connection to popular 8-bit microprocessors.
• On-chip temperature-compensated bandgap reference provides precision voltage for ADC and DAC.

Specialized Applications

• Microprocessor-based data acquisition systems
• Industrial process control interfaces
• Analog signal conditioning circuits

Specialized Procurement Notes

Verify the specific suffix JPZ corresponds to the 28-pin Plastic Leaded Chip Carrier (PLCC) package and commercial temperature range (0°C to +70°C). Confirm that the ordering suffix does not alter the internal functionality compared to other AD7669 variants. Ensure compatibility with the required supply voltage configuration before procurement.

Specialized Selection Notes

Select this component when an integrated 8-bit ADC/DAC solution is required for microprocessor interfacing. Consider the PLCC package availability if surface mount assembly is preferred over DIP. Evaluate the need for dual DAC outputs, as the AD7669 provides two channels unlike the single-channel AD7569.

Specialized Part Context

The AD7669 is part of the Analog Devices AD7569/AD7669 family of complete analog I/O systems. While the AD7569 offers a single DAC output, the AD7669 variant provides dual DAC outputs with buffer amplifiers. Both share the same ADC architecture and digital interface specifications.

Specialized Replacement Considerations

The AD7569 series serves as a functional alternative for applications requiring only a single DAC output. Other Analog Devices 8-bit ADCs may be considered if higher resolution or different interface protocols are needed.

Specialized FAQ

How is the analog input/output range selected?

The range is programmed using the RANGE input pin in conjunction with the VSS supply voltage. Single supply (VSS = 0 V) enables unipolar ranges, while dual supply (VSS = -5 V) enables bipolar ranges.

What is the maximum sampling rate supported by the ADC?

The ADC has a conversion time of 2 μs max, which supports a sampling rate up to 500 kS/s depending on the clock frequency and interface timing constraints.

Is the device compatible with TTL logic levels?

Yes, the digital inputs and outputs are compatible with both TTL and 5 V CMOS logic levels, facilitating direct connection to various microprocessors.