SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23D • 12277 Berlin • Germany
Phone +49 30 772051-0 • Fax +49 30 7531078
E-Mail: sales@shf.de • Web: http://www.shf.deDatasheet
SHF 631 A56 Gbps
D Flip Flop (DFF)

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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Description
The SHF 631 A is a re-timing and re-shaping D Flip-Flop (DFF) module capable of broadband operation
up to 56 Gbps. AC-coupled and 50  terminated data and clock inputs ensure proper line termination anduncomplicated application. Optimum bias point for the data input can be set using the potentiometer on
the provided bias board.

FeaturesBroadband operation up to 56 Gbps
Single ended inputs (data and clock)
Differential output, 700 mV single ended output swing
Output Level Control
Bias BoardApplications


100G Ethernet development and prototyping
OC-768 / STM-256 applications
Telecom transmission

Fibre Channel
Broadband test and measurement equipment®

Block Diagram®

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

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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Bias Board
At delivery, the bias board is mounted on a common base plate, together with the SHF 631 A DFF. Whenusing the bias board only one supply voltage of -5V needs to be applied; all operating voltages will beprovided by the bias board.
With the factory settings all bias voltages are set to optimum / maximum output voltage. However, ifrequired the customer can adjust the output level “LVL” and the input data bias “DB” with the appropriate
trim potentiometers on the bias board.
For system applications it is possible to remove the bias board. In that case the operating voltages haveto be supplied by the customer’s circuitry.
Output Level Control “LVL”
Data Bias Adjust “DB”
Not Used-5V

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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Specifications
Parameter

Unit

SymbolMin.

Minimum Input Data Rate

Gbps

Rin,minMaximum Input Data Rate

Gbps

Rin,max

Data Input VoltagemVpp

Vdata in

Data Input Sensitivity

mV

Vdata in100

Clock Input Frequency

GHz

fin

2Clock Input VoltagemVpp

Vclk in500°

CPM

200160

Output Amplitude

mVVout600

Rise / Fall time

psTyp.

Max.

Comment

12@ 500mVpp clock input

Input Parameters

Clock Phase Margin356@ 500mVpp clock input
1000
1Eye Height, see page 856

21000

See page 8
Up to 50 Gbps,
Above 50 Gbps,
see page 8

Output Parameters
700

900

Single ended,adjustable up to -3dB

tr/tf

7

1020% / 80%

fsJrms400

600

Supply Voltage

VVee-5-4.8

Supply Current

mAIee250280mW

Pd1250

Output Level Adjust

VLVL

-3.3

Input Data BiasVDB-3.3°C

Tambient

15

Output Jitter, RMS value

4Power Requirements

Power Dissipation-5.2@ VEE = -5V;
incl. Bias Board

Bias Voltages
0-1,65

if not used, connect tognd0Conditions
Operating Temperature

1

Test criteria: BER<10-9 ; to achieve best output eye performance, value should be higher

2

Test criteria: BER<10-9 ; to achieve best output eye performance, value should be higher

34Clock Phase Margin [deg] 

35Phase Margin (measured) [ps] Peak - Peak - Source - Jitter [ps] 360
Eye Length [ps]Test condition: Input Signal JitterRMS = 230 fs

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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Typical Output Eye Diagrams
31

The measurements below had been performed using a SHF 12100 A Bit Pattern Generator (PRBS 2 -1,Vamplitude = 350 mV) and an Agilent 86100D Digital Communication Analyzer (DCA) with Precision Time Base
Module (86107A) and 70 GHz Sampling Head (86118A). The outputs of the DFF module had beenconnected directly to the DCA input.

Out @ 56 Gbps

Out! @ 56 Gbps

Out @ 50 Gbps

Out! @ 50 Gbps

Out @ 43 Gbps

Out! @ 43 Gbps

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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Out @ 32 Gbps

Out! @ 32 Gbps

Out @ 28 Gbps

Out! @ 28 Gbps

Out @ 25 Gbps

Out! @ 25 Gbps

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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Out @ 16 Gbps

Out! @ 16 GbpsOut @ 56 Gbps, Level = -3dBOut! @ 56 Gbps, Level = -3dB

Out @ 56 Gbps, tr/tf

Out! @ 56 Gbps, tr/tf

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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Typical Results
The measurements shown below had been performed using a SHF 12103 A Bit Pattern Generator
31(PRBS 2 -1), a SHF 11100 A Error Analyzer, an Agilent 86100B Digital Communication Analyzer withPrecision Time Base Module (86107A) and a 70 GHz Sampling Head (86118A) to determine the eyeheight and jitter contribution of the input signal.
Data Input Sensitivity

Measurement Conditions:

Sensitivity [mV], (Eye Height)

100

Clock Input Amplitude: 500mVpp

9080

Clock Input Jitter: 230fs

70

BER-Limit: 10-9605040302010005101520253035
Bit Rate [Gbps]

4045505560

Clock Phase Margin

Measurement Conditions:

360

Data Input Eye Height: 100mV

320

Clock Input Amplitude: 500mVpp

Phase Margin [°]280

Clock Input Jitter: 230fs

240

BER-Limit: 10-920016012080
400051015202530354045505560

Bit Rate [Gbps]

Clock Input Sensitivity

Measurement Conditions:

500

Data Input Eye Height: 100mV

Sensitivity [mVpp]

450

400

Clock Input Jitter: 230fs

350

BER-Limit: 10-9300
250
2001501005000510152025303540
Input Frequency [GHz]45505560

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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Outline Drawing – Module

3459,1

29,1

1GND
3,85,08
4 x 5,08

1912,34x Ø2,7ClkOut

29Out

In1.85mm (V) female

Out1.85mm (V) female

Out1.85mm (V) female

Clk

1.85mm (V) female

PinDesignation

1Level (LVL)

2Data Bias (DB)

3nc

4nc

5-5V

19

SHF AG Berlin-5V

3

LVL DB

3Connector

In

XXXXX

19PortDFF

353835

SHF 631 A

2834
40
52,6

12,3

5,08
9,7
19,512,3

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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14,114,1

Outline Drawing – “Module + Bias Board”- Assembly

6,3

6,3

14,1254xØ
43,ClkOut

SHF 631 A
OutDFF

In85,48077

XXXXX

SHF AG Berlin
SHF AG Berlin

-5V54
35464

LVL DB

524,528,5PortConnector

In

1.85mm (V) female

Out1.85mm (V) female

Out1.85mm (V) female

Clk

1.85mm (V) female

283440

SHF reserves the right to change specifications and design without notice – SHF 631 A - V003 – August 09, 2013

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