AD9901KQ

Overview

The AD9901KQ is a digital phase/frequency discriminator from Analog Devices, packaged in a 14-lead ceramic DIP (Q-14). It operates on a single +5 V supply for TTL/CMOS compatibility or a –5.2 V supply for ECL inputs. The device compares phase and frequency inputs up to 200 MHz using a trench-oxide isolated process. Key electrical characteristics include a linear phase detection range of 360 degrees at 40 kHz and 270 degrees at 70 MHz. Supply current is typically 54.0 mA at +5.0 V. The operating temperature range is 0°C to +70°C.

Feature Summary

• Ultrahigh speed phase/frequency discrimination up to 200 MHz
• Linear transfer function with no indeterminate "dead zone"
• Compatible with ECL, TTL, and CMOS logic levels
• Open-collector outputs allow adjustable output swing

Applications

• Low phase noise reference loops
• Fast-tuning agile IF loops
• Secure hopping communications systems
• Coherent radar transmitter/receiver chains

Procurement Notes

Verify the package type matches the Q-14 14-lead ceramic DIP specification. Confirm the commercial temperature grade (0°C to +70°C) aligns with system requirements. Check for MIL-STD-883 compliance if military specifications are necessary, as this variant requires specific ordering codes distinct from the standard KQ suffix.

Selection Notes

Select the AD9901KQ when a linear phase detector without dead zones is required for frequencies up to 200 MHz. Ensure the design supports a +5 V supply for TTL/CMOS modes or –5.2 V for ECL modes. Consider the open-collector output configuration for matching post-filtering input requirements via an external RSET resistor.

Part Context

The AD9901 series includes variants such as the AD9901KP (20-lead PLCC) and military-grade versions like the AD9901TQ/883. The KQ suffix specifically denotes the commercial temperature range device in the 14-lead ceramic DIP package. Other models may offer different pin counts or extended temperature ranges but share the same core phase/frequency discrimination functionality.

Replacement Considerations

No direct public substitute part numbers are documented in the provided source material.