AD668JQ

Overview

The AD668JQ is a 12-bit ultrahigh speed multiplying digital-to-analog converter (DAC) from Analog Devices. It features a current output of 10.24 mA or a voltage output of 1.024 V, with a reference bandwidth of 15 MHz. The device guarantees monotonicity over its operating temperature range of 0°C to +70°C. Digital settling time reaches 90 ns to ±0.025% for full-scale changes. It utilizes complementary bipolar process technology and laser wafer trimming for linearity. The component is housed in a 24-pin ceramic dual in-line package (Cerdip).

Feature Summary

• Ultrahigh speed performance with 90 ns current settling time to 1 LSB.
• Multiplying capability allowing analog input modulation from 10% to 120% of nominal full scale.
• Guaranteed monotonicity over the full rated specification temperature range.
• Integrated 100 Ω ±1% output resistance when RL pin is grounded.

Applications

• Waveform generation systems requiring high-speed updates.
• Graphics display controllers needing fast DAC response.
• High-speed analog-to-digital conversion front-ends.
• Precision instrumentation utilizing multiplying DAC functionality.

Procurement Notes

Verify the specific grade suffix JQ corresponds to the commercial temperature range of 0°C to +70°C. Confirm the package type is the 24-pin Cerdip variant. Check for MIL-STD-883 compliance requirements if military specifications are necessary, as separate versions exist. Ensure power supply rails match the specified ±15 V operational limits.

Selection Notes

Select the AD668JQ when a 0°C to +70°C operating range is sufficient. Choose this model over the AQ or SQ grades if industrial or commercial temperatures suffice. Consider the KQ grade if tighter linearity specifications (±1/4 LSB) are required within the same temperature range. Verify logic family compatibility, as the device interfaces well with TTL and CMOS families.

Part Context

The AD668 series includes grades J, K, A, and S, differentiated by temperature ranges and linearity accuracy. The JQ and KQ variants cover 0°C to +70°C. The AQ covers -40°C to +85°C, while the SQ extends to -55°C to +125°C. All share the same 24-pin Cerdip package and core architecture.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult the Analog Devices Military Products Databook for detailed specifications on screened versions compliant with MIL-STD-883.