AD568KQ

Overview

The AD568KQ is a 12-bit ultrahigh-speed monolithic digital-to-analog converter (DAC) from Analog Devices. It utilizes a complementary bipolar process to achieve current settling to 0.025% in 35 ns and voltage settling to 0.025% in 50 ns. The device features a high-stability buried zener reference, guaranteed monotonicity over temperature, and a 10.24 mA full-scale output suitable for video applications. It operates on dual supplies of ±13.5 V to ±16.5 V and is housed in a 24-lead ceramic DIP package rated for operation between 0 °C and +70 °C.

Feature Summary

• Ultrahigh speed with current settling to 0.025% in 35 ns
• 12-bit resolution with ±1/4 LSB linearity error at +25°C
• Integrated high-stability buried zener reference
• Monotonicity guaranteed over the full operating temperature range

Applications

• Waveform generation
• Graphics display systems
• High-speed A/D conversion

Procurement Notes

Verify the component grade matches the required performance specifications. The AD568KQ offers tighter linearity and gain drift tolerances compared to the AD568JQ variant. Confirm that the application environment remains within the specified 0 °C to +70 °C operating temperature range for this specific package type.

Selection Notes

Select the AD568KQ when precise linearity is critical, as it guarantees ±1/4 LSB maximum linearity error at +25°C. This model provides a maximum gain drift of ±30 ppm/°C, which is superior to the ±50 ppm/°C found in other grades. Ensure the design accommodates the required ±15 V power supplies and the 24-lead skinny DIP footprint.

Part Context

The AD568KQ belongs to the AD568 family of ultrahigh-speed DACs. It shares the same physical package and core architecture as the AD568JQ and AD568SQ but is distinguished by its tighter electrical tolerances. While the JQ and SQ variants allow up to ±1/2 LSB linearity error, the KQ version is laser-trimmed to ±1/4 LSB, targeting applications requiring higher precision without sacrificing speed.

Replacement Considerations

The AD568JQ serves as a lower-cost alternative with identical pinouts but looser accuracy specifications (±1/2 LSB linearity). The AD568SQ provides extended temperature capability (-55 °C to +125 °C) but does not offer the improved linearity of the KQ grade.

FAQ

What is the maximum linearity error for the AD568KQ?

The AD568KQ has a maximum linearity error of ±1/4 LSB at +25°C.

How does the AD568KQ differ from the AD568JQ?

The AD568KQ offers tighter performance specifications, specifically ±1/4 LSB linearity error and ±30 ppm/°C gain drift, whereas the AD568JQ allows ±1/2 LSB linearity and ±50 ppm/°C gain drift.

What logic families are recommended for driving the AD568KQ?

High-speed logic families such as Schottky TTL (STTL), High-Speed CMOS (HCMOS), or FAST TTL are recommended to minimize settling time and glitch impulse.