50 MHz Prescaler Models and Datasheets
Compare frequency dividers and prescalers for reducing an input frequency to a lower-frequency signal for counting, timing and phase-locked-loop applications. This product family covers input frequencies up to 50 MHz, with electrical interfaces and division ratios that vary by model.
The catalog lists HD31398, HD31401 and HD31402 with downloadable datasheets. Select the required input range, division ratio, input level and output interface before comparing supply voltage and mechanical details. Confirm all operating limits in the selected model datasheet before ordering.
Frequency Divider/Prescaler Up to 50 MHz
| Part Number | Start Frequency (MHz) | Stop Frequency (MHz) | Function Divider Ratio | RF Input Power (dBm) | Output Power (dBm) | SSB Phase Noise at 100 kHz Offset (dBc/Hz) | DC Power (Volt) | DC Power (mA) | |
| HD31398 | 0.1 | 50 | ÷N, 2–256 factory-set | Frequency-dependent; see datasheet | +12 typical | -144 typical | 7–24 (12 typical) | 70 typical | Download |
| HD31401 | TTL/CMOS | Download | |||||||
| HD31402 | DC | TTL/CMOS | Download |
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Custom Prescaler Engineering
Send your frequency-division requirements for a catalog or custom-solution review. Include the input frequency range, signal level, division ratio, output interface, available supply and mechanical constraints. Any custom packaging, screening or environmental requirements should be agreed in the quotation and supporting documentation.
Frequency and Ratio Selection
Specify the input band and output frequency you need. HD31398 divides a 0.1–50 MHz input by a factory-set N from 2 to 256. Include the required ratio in your quote request and check input sensitivity across your full band.
Operating Conditions
Match the model’s operating-temperature range, supply limits and input-power ratings to your application. HD31398 lists operation from −40 to +85 °C. Request supporting documentation for any additional vibration, screening or qualification requirements.
Electrical and Mechanical Interfaces
Compare input and output connectors, signal coupling, output load, supply voltage and outline dimensions. Provide the receiving circuit’s logic thresholds or impedance so the interface can be reviewed before model selection.
Choosing the Right Prescaler
Choose a prescaler by its input frequency and required division ratio, then check electrical compatibility with the following stage. For a divide-by-N device, output frequency is input frequency divided by N; a 10 MHz input divided by 100 gives a 100 kHz output.
- Division ratio: HD31398 has a factory-set ratio from 2 to 256. Specify N when ordering; do not assume it is adjustable in operation.
- Input sensitivity: For HD31398, the minimum input is +10 dBm at 100–200 kHz, +3 dBm at 200 kHz–1 MHz, −10 dBm at 1–5 MHz and −20 dBm at 5–50 MHz. The specified maximum is +17 dBm. These ranges apply at the datasheet test conditions.
- Output interface: Check waveform, coupling, load and logic thresholds. HD31398 specifies an AC-coupled square-wave output; compare the HD31401 and HD31402 datasheets for their TTL/CMOS interfaces.
- Noise and supply: HD31398 specifies typical SSB phase noise of −144 dBc/Hz at a 100 kHz offset, a 7–24 V supply range and 70 mA typical supply current. A single phase-noise figure is not an integrated jitter specification.
- Integration: Confirm connector, outline, grounding and operating temperature for the selected model. HD31398 lists an operating temperature of −40 to +85 °C.
Read the HD31398 datasheet for test conditions and limits. For higher input frequencies, compare the 4 GHz prescaler family. Include the part number, division ratio, input band, signal level and quantity in your quote request.
Technical FAQ
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