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The HP 10544A is a 10 MHz quartz crystal oscillator designed as an extremely stable, compact, and low-power frequency source for both instrument and systems applications. The crystal, oscillator, buffer amplifier, and oven control circuits are all mounted inside a thermally insulated oven, with the crystal itself ruggedly mounted in a cold-welded enclosure. The unit delivers a 1 V rms output at 10 MHz into a 1000-ohm load from an AC-coupled emitter-follower stage.
Per the datasheet, the 10544A is ideally suited for use in communication and navigation systems, synthesizers, time-code generators, counters, and spectrum analyzers. The 10 MHz output frequency provides a convenient starting point that is easily divided or multiplied for downstream stages. The low aging rate of less than 1.5 x 10⁻⁷/year allows manufacturers of communication and test equipment to reduce the frequency of calibration necessary to stay within FCC accuracy requirements.
Hewlett-Packard's test and measurement business was spun off as Agilent Technologies in 1999, and the electronic measurement portion of that business was further separated to form Keysight Technologies in 2014. Frequency reference components originally branded HP — including the 10544A — therefore trace through the same corporate lineage that today operates under the Keysight name.
| Specification | Value |
|---|---|
| Frequency | 10 MHz (5 MHz available on special order) |
| Aging Rate | <5 x 10⁻¹⁰/day after 24-hour warm-up; <1.5 x 10⁻⁷/year |
| Short Term Stability | 1 x 10⁻¹¹/1 s avg. time; 1 x 10⁻¹¹/10 s avg. time; 2 x 10⁻¹¹/100 s avg. time |
| Temperature Coefficient | <1 x 10⁻⁸ frequency change over -55°C to 71°C; <3 x 10⁻⁹ over 0 to 71°C |
| Load | <5 x 10⁻¹⁰ frequency change for 250 Ohm load change |
| Warm Up | Within 5 x 10⁻⁹ of final value 15 minutes after turn-on, at 25°C |
| Oscillator/Amplifier Input | 10.6–11.7 Vdc, 15 mA, Noise <100 µV |
| Oven Controller Input | 10.6–11.7 Vdc, 5 mA |
| Oven Input | 15–30 Vdc; Turn-on load is 50 Ohms; Power drops to 2½W at 25°C after 15 minutes |
| Oscillator/Amplifier Voltage Coefficient | <5 x 10⁻¹⁰ for 1% voltage change |
| Oven Voltage Coefficient | <1 x 10⁻¹⁰ for 10% voltage change |
| Coarse Frequency Adjustment Range | >±2 x 10⁻⁶ from 10 MHz with 18-turn control |
| Electronic Frequency Control (EFC) | ≥1 x 10⁻⁷, control range -5 Vdc to +5 Vdc |
| Output Voltage | 1 V rms ±20% into 1000 Ohms from ac coupled (.01 µF) emitter-follower |
| Harmonic Distortion | Down more than 25 dB from rated output |
| Nonharmonic Components | Down more than 80 dB from rated output |
| Signal-to-Single-Sideband Phase-Noise Ratio (1 Hz BW) | 10 Hz offset: 115 dB; 100 Hz: 120 dB; 1 kHz: 125 dB; 10 kHz: 130 dB |
| Connectors | Printed circuit — Mates with CINCH 250-15-30-261 (HP 1251-0159) or equivalent |
| Operating Temperature | -55°C to +71°C |
| Storage Temperature | -55°C to +75°C |
| Altitude | 50,000 feet (15.2 km) |
| Humidity | 95% RH at 40°C |
| Vibration | 0.01" peak-to-peak, 10 to 55 Hz |
| Size | 2-3/4" x 2-1/32" x 2-7/16" (13.6 cu. in.) (6.985 x 5.159 x 6.191 cm) |
| Weight | 11 oz (0.31 kg) |
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
HP
Condition
Used
Manufacturer
Agilent
30+ Years in Business
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