Data Sheet SHF C643 A
SHF Communication Technologies AG

Data SheetSHF C643 A

40-80 GHz T-Flip-Flop (TFF)
1:2 Frequency Divider
SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 1

Data Sheet SHF C643 A
SHF Communication Technologies AG

Description
The SHF C643 A is a T-Flip-Flop (TFF) module capable of broadband operation up to 80 GHz using asinusoidal input signal. A frequency of half the input frequency is provided at the outputs. It offers highquality output signals together with a compact size and ease of operation.

Features

Broadband operation from 40 to 80 GHz

Two differential output ports with 90° phase shift between the outputs



800 mVpp single ended output swingSingle ended or differential operation (either In or In! or both can be used)

Applications


Next generation Ethernet standards

Telecom transmission

Fibre Channel®

Broadband test and measurement equipmentPrescaler in high-speed clock distributions

Configurations


WFVF: 1.0 mm inputs and 1.85 mm outputs



Other configurations on requestAccessories
+5 V Power Supply Desktop Adapter

Functional earth cable  Connection to test setup ground has to be set up first before any otherconnection to prevent instrument damage!

®

Fibre Channel is a registered trademark of the Fibre Channel Industry Association

SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 2

Data Sheet SHF C643 A
SHF Communication Technologies AG

Block Diagram
InInSHF
C643 A

Out2

Out1TFF
Out2

Out1
Mini-USB(Service only)+5VFEMin

TypSpecifications1
Absolute Maximum RatingsParameterUnitSymbolMax

CommentInput VoltagemVVclk in1000

Peak-to-Peak

External DC Voltage on
RF Input Ports

VVDCin-6+6

AC coupled input

External DC Voltage on
RF Output Ports

VVDCout-6+6

AC coupled output

DC Supply Voltage

VVcc

0+6Parameter

UnitSymbol

Min

Minimum Input Frequency

GHzfin,minMaximum Input Frequency

GHzfin,max

80

Input Voltage

mVVin

400

Input Parameters

1TypMax

Comment40@ 400 mV input voltage@ 400 mV input voltage

950

Single ended, peak-to-peak,
see page 7

These specifications are valid for the WFVF configuration

SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 3

Data Sheet SHF C643 A
SHF Communication Technologies AG

Output Parameters
Parameter

Unit

Symbol

MinTypMax

Comment

Minimum Output Frequency

GHzfout,min20@ 400 mV input voltage

Maximum Output
FrequencyGHzfout,max

40

Output Voltage

mVVout500

Parameter

Unit

SymbolMin

Supply Voltage

V

VCC

4.8

Supply Current

mA

ICC

600

Power Dissipation

WPd

3.0@ VCC = +5 V

Parameter

Unit

SymbolMax

CommentInput Connectors

Ω501.0 mm (W) female

Output Connectors

Ω501.85 mm (V) femaleDimensions

mmWeightg@ 400 mV input voltage
950

Single ended, peak-to-peak,
see page 7

TypMaxComment5.0

5.2

Supply Voltage

Power Requirements

Mechanical Characteristics
Min

TypSee pages 8-990

SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 4

Data Sheet SHF C643 A
SHF Communication Technologies AG

Typical Output Waveforms
The measurements below had been performed using a Tektronix DSA 8300 Digital Serial Analyzer (DSA)
with Phase Reference Module (82A04B-60G) and 70 GHz Sampling Module (80E11). The outputs of the TFF
had been connected directly with a 10 dB attenuator the DSA input. The input voltage is 500 mVpp.

Output signal @ fout = 42.5 GHz

Output signal @ fout = 40 GHz

Output signal @ fout = 35 GHz

Output signal @ fout = 30 GHz

Output signal @ fout = 25 GHz

Output signal @ fout = 20 GHz

SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 5

Data Sheet SHF C643 A
SHF Communication Technologies AG

Output Signal Timing
The measurements below had been performed using a Tektronix DSA 8300 Digital Serial Analyzer (DSA)
with Phase Reference Module (82A04B-60G) and 70 GHz Sampling Module (80E11). The outputs of the TFF
had been connected directly with a 10 dB attenuator the DSA input. The screenshots shown below describe
the phase relation between the 2 differential output signals with its 90° phase shift between output port 1
and output port 2.

Out1 @ fout= 25 GHz

Out1 inverted @ fout= 25 GHz

Out2 @ fout= 25 GHz

Out2 inverted @ fout= 25 GHz

SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 6

Data Sheet SHF C643 A
SHF Communication Technologies AG

Typical Results
The RMS jitter of the output signal increases with a decreasing the input power. The minimum input power
below is measured to reach a maximum output RMS jitter of ~200 fs.

Input Sensitivity

Minimum Input Power [dBm]50354045505560

657075808590-5-10-15-20
Input Frequency [GHz]The frequency-dependent output voltages of all output ports are very similar. The diagram below shows atypical output voltage curve.

Output Voltage
10.9
Output Voltage [Vpp ]

0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.10202530354045

Output Frequency [GHz]SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 7

Data Sheet SHF C643 A
SHF Communication Technologies AG

Mechanical Drawing - Configuration WFVFad bc

40
28
104xØ2.7

13.6

12.1

13.6

InInOut1Out2SHF C643 ATFF

Out2

Out1354554514535

XXXXX

SHF CommunicationTechnologies AG3USB

23.7+5 V DC34PortConnector

In1.0mm female

In1.0mm female

Out1

1.85mm (V) female

Out11.85mm (V) female

Out2

1.85mm (V) female

Out2

1.85mm (V) female

12.4

12.4

PortConnector

aMini-USBbPowerc

Functional earth (FE)dPower-LED

all dimensions in mm

SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 8

Data Sheet SHF C643 A
SHF Communication Technologies AG

Mechanical Drawing with Heat Sink - Configuration WFVF

ad b

c

52.7
1019.66

In19.6In
Out1Out2

SHF C643 A
TFF

Out2

Out1

XXXXX+5 V DC70101111USB

111101120132.4

SHF CommunicationTechnologies AGConnector

In1.0mm female

In1.0mm female

Out11.85mm (V) female

Out11.85mm (V) female

Out21.85mm (V) female

Out21.85mm (V) female

12037PortPortConnectoraMini-USB

bPowerc

Functional earth (FE)dPower-LED

all dimensions in mm

SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 9

Data Sheet SHF C643 A
SHF Communication Technologies AG

SHF Communication Technologies AGWilhelm-von-Siemens-Str. 23 D | 12277 Berlin | Germany+49 30 772 051 0sales@shf-communication.com
www.shf-communication.com

SHF reserves the right to change specifications and design without notice
V001 - Jan. 26, 2023 - Page 10