Interface Guide: STZ-PF/MF Series Frequency and Pulse Distributors

Overview

The BRIDZA STZ-PF and STZ-MF series distributors are essential components for clock distribution systems, providing ultra-low jitter signal fan-out with excellent channel-to-channel isolation. The STZ-PF series handles frequency signals from 1-120MHz, while the STZ-MF series specializes in pulse distribution with rise times under 1ns.

Supported Models

STZ-PF Series (Frequency Distributor)

Model	Channels	Input	Form Factor
-------	----------	-------	-------------
STZ-PF-04	4	1	1U Rack
STZ-PF-08	8	1	1U Rack
STZ-PF-16	16	1	2U Rack
STZ-PFM1-04	4	1	Module
STZ-PFM1-08	8	1	Module
STZ-PFM3-16	16	1	Module

STZ-MF Series (Pulse Distributor)

Model	Inputs	Outputs	Form Factor
-------	--------	---------	-------------
STZ-MF-02-16	2	16	1U Rack
STZ-MFM1-04	1	4	Module
STZ-MFM2-08	2	8	Module

Connector Locations

 ┌────────────────────────────────────────────────────────────────┐
 │ STZ-PF-08 FRONT PANEL │
 │ │
 │ INPUT OUTPUT │
 │ ┌────┐ ┌──┬──┬──┬──┬──┬──┬──┬──┐ │
 │ │SMA │ │01│02│03│04│05│06│07│08│ │
 │ │ 10M│ └──┴──┴──┴──┴──┴──┴──┴──┘ │
 │ │ Hz │ SMA female outputs │
 │ └──┬─┘ │
 │ │ │
 │ │ │
 │ ┌──┴──┐ ┌────┐ ┌────┐ ┌────┐ ┌────┐ ┌────┐ ┌────┐ │
 │ │PWR │ │LOCK│ │IN1 │ │OUT │ │SYNC│ │REF │ │GND │ │
 │ │ LED│ │ LED│ │ LED│ │ LED│ │ LED│ │ LED│ │ LED│ │
 │ └──┬──┘ └────┘ └────┘ └────┘ └────┘ └────┘ └────┘ │
 │ │ │
 │ +12V DC Input (5.5×2.1mm) RS485 (optional) │
 │ │
 └────────────────────────────────────────────────────────────────┘

Interface Definitions

STZ-PF Series: Frequency Input

Parameter	Specification
-----------	---------------
Connector	SMA female
Frequency Range	1MHz to 120MHz
Input Level	-3 to +10dBm
Input Impedance	50Ω
VSWR	≤1.5:1
Input Protection	±10V maximum without damage

STZ-PF Series: Frequency Output

Parameter	Specification
-----------	---------------
Connectors	SMA female (×4/8/16)
Output Level	13dBm ±2dB
Frequency	Same as input
Load Impedance	50Ω
Channel Isolation	≥60dB @ 10MHz
Channel-to-Channel Skew	≤100ps
Phase Jitter	<3fs RMS @ 1s
Additional Stability	≤5×10⁻¹⁵/s

STZ-MF Series: 1PPS Input

Parameter	Specification
-----------	---------------
Connectors	SMA female (×2)
Input Level	TTL / LVPECL (selectable)
Input Impedance	50Ω (TTL) / 100Ω (LVPECL)
Pulse Width	1μs to 100ms
Min. Amplitude	2V peak
Max. Input	±10V with 50Ω termination

STZ-MF Series: Pulse Output

Parameter	Specification
-----------	---------------
Connectors	SMA female (×16)
Output Level	TTL / LVTTL / LVPECL (selectable)
Output Level TTL	High: 2.5V min, Low: 0.5V max
Output Level LVPECL	High: 2.0V, Low: 0.3V
Rise Time	≤1ns
Fall Time	≤1ns
Channel Consistency	≤150ps
Output Jitter	≤10ps RMS
Output Drive	50mA maximum per channel

Switching Modes (STZ-MF)

The STZ-MF supports multiple switching modes for flexible system integration:

Mode	Description	Application
------	-------------	-------------
Manual	Front panel or software selection	Standalone operation
Automatic	Switch to secondary on primary failure	Failover systems
Pulse-through	Both inputs combined	Redundant sources
Pulse-invert	Input 1 passes, input 2 inverted	Phase adjustment

Power Supply

DC Input Specifications

Parameter	STZ-PF Series	STZ-MF Series
-----------	---------------	---------------
Voltage	+12VDC	+12VDC / +24VDC
Current	<1.5A	<1A
Power	<20W	<15W
Connector	5.5×2.1mm DC jack	Terminal block

Pin Assignment:

 ┌─────────────────────┐
 │ + - ⏚ │
 │ │ │ │ │
 │ 12V GND Chassis │
 └─────────────────────┘

Mechanical Dimensions

1U Rack Module (STZ-PF-08)

 482mm (19" rack width)
 ┌─────────────────────────────────────┐
 │ │ 44mm (1U)
 │ STZ-PF-08 │
 │ FREQUENCY DISTRIBUTOR │
 │ │
 │ [SMA] [SMA] [SMA] ... ×8 │
 │ INPUT OUTPUTS │
 └─────────────────────────────────────┘
 └── 350mm ──┘
 
 Rack mounting: Slide rails or screws

Module Format (STZ-PFM1)

 129.5mm
 ┌───────────────────────────┐
 │ ┌───────────────────┐ │ 120mm
 │ │ INPUT OUTPUTS │ │
 │ │ [SMA] [SMA×4] │ │
 │ │ │ │
 │ └───────────────────┘ │
 │ └──13mm──┘ │
 └───────────────────────────┘
 
 Mounting: 4× M2 screws

Typical Application

 ┌──────────────────────────────────────────────────────────────┐
 │ CLOCK DISTRIBUTION SYSTEM │
 │ │
 │ ┌─────────┐ │
 │ │ Rubidium │ │
 │ │ Clock │ │
 │ │ 10MHz │ │
 │ └────┬────┘ │
 │ │ │
 │ Coaxial Cable │
 │ │ │
 │ ▼ │
 │ ┌─────────────────┐ │
 │ │ STZ-PF-16 │ │
 │ │ 1×16 Dist. │ │
 │ └────────┬────────┘ │
 │ │ │
 │ ┌────────┬─────────┼─────────┬────────┐ │
 │ │ │ │ │ │ │
 │ ▼ ▼ ▼ ▼ ▼ │
 │ ┌──────┐ ┌──────┐ ┌──────┐ ┌──────┐ ┌──────┐ │
 │ │Freq. │ │Freq. │ │Signal│ │Signal│ │Signal│ │
 │ │Counter│ │Counter│ │Analyz │ │Analyz │ │Analyz │ │
 │ └──────┘ └──────┘ └──────┘ └──────┘ └──────┘ │
 │ │
 │ Output 1PPS to: Timestampers, Oscilloscopes, System Clocks │
 │ │
 └───────────────────────────────────────────────────────────────┘

Configuration

DIP Switch Settings (STZ-PF)

SW1	SW2	SW3	Function
-----	-----	-----	----------
ON	-	-	10MHz mode
OFF	-	-	5MHz mode
-	ON	-	High gain output
-	OFF	-	Low gain output
-	-	ON	Internal reference
-	-	OFF	External reference

Serial Interface (Optional)

Protocol: RS485
Baud Rate: 9600
Address: 0x01-0xFF (set via rotary switch)

RS485 Commands:

:INST:ADDR  ; Set address
:OUTP:STAT ,<0|1> ; Enable/disable channel
:GAIN  ; Set output gain
:STATUS? ; Query channel status

Troubleshooting

Symptom	Cause	Solution
---------	-------	----------
No outputs	No input signal	Verify input source
-	DC power off	Check power supply
Low output level	Input level too low	Increase input to -3 to +10dBm
-	Cable loss	Use shorter cables
Channel mismatch	Thermal variation	Allow 30 min warm-up
-	Input frequency error	Verify input frequency
Switching failure	Wrong mode selected	Check DIP switch settings

Download Resources

Document Version: 1.0

Last Updated: 2026-05-24

BRIDZA Technologies