CDM-5

Clock Distribution ModulePCIe card providing 10MHz and 1PPS signals for up to five devices

Orolia’s CDM-5 clock distribution module is a PCIe card that provides 10MHz and 1PPS signals for up to five devices that need tight and precise synchronization. The clock distribution module is ideal for PCIe-based Software-Defined Radios (SDR) installed in rack-mount or desktop PCs, and can also be used for any other applications that require a precise PC-based timing reference.

Key Features

Timing and frequency source with 5-way distribution of 10MHz and 1PPS signals
PCIe form factor for rack-mount or desktop PC
Two operating modes: internal clock (OCXO) or external clock (10MHz and 1PPS)
Supports standalone operation with 12V DC power supply

Two operating modes

The CDM-5 clock distribution module features two operating modes—internal or external— that are selected with the bracket-mounted switch.

In internal mode, the CDM-5’s internal clock signal is extracted from the onboard high-grade oven-controlled crystal oscillator (OCXO).

When operating in external mode, the CDM-5 accepts input signals in the form of 10MHz and 1PPS, which are then re-distributed via five matched-length traces. Split signals are amplified to maintain the power level across all distributed paths.

Additionally, the CDM-5 will regenerate 1PPS from an external 10MHz-only source if a 1PPS source is not available.

The selection between internal or external mode is achieved through the bracket-mounted switch.

Integrate it in your own design

The CDM-5 clock distribution module can be integrated into a custom assembly simply by removing the bracket plate and powering the board through its 12V DC connector.

When the bracket is removed, the operating mode can be toggled using the onboard switch.

CDM-5's onboard switch

A perfect companion to Skydel

CDM-5 is perfectly suited to do multiple SDR synchronization. Paired with DekTec DTA-2115B, it enables a compact and powerful PCIe Skydel GNSS Simulator configuration.

See All Skydel Configurations

Specifications

Input

Connector Type: MCX
10MHz input range: 0.5…5 V
1PPS input range: 2.5…5 V

Output

Connector Type MCX
10MHz 2.5 V
1PPS 5 V
10MHz output waveform Square wave
1PPS output waveform Logic-level pulse
10MHz duty cycle 50%
1PPS duty cycle 1%
Time offset between any two 1PPS outputs < 50 ps

Oscillator Performance

Frequency accuracy < 100 ppb
Recommended warm-up time 30 min
Minimum operational warm-up time 5 min
Phase-noise
- -116dBc@10Hz
- -137dBc@100Hz
- -144dBc@1kHz

Power Supply

DC Input (PCIe slot or external connector) 12 V
Current consumption < 1 A

Physical

Dimensions 11.2 x 6.6 x 2.2 in.
Temperature range 0…50 ºC

Resources

	Title
Datasheets	Skydel CDM-5 Datasheet Skydel’s CDM-5 clock distribution module is a PCIe card that provides 10MHz and 1PPS signals for up to five devices that need tight and precise synchronization. pdf - 657 KB— May 25, 2018 [ Permalink ]