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-communication.com • Web: www.shf-communication.com

Datasheet
SHF 614 C60 GBaud 6-Bit DAC

SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018

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Description
The SHF 614 C is a 6-Bit Digital-to-Analog Converter (DAC) operating at symbol rates up to 60 GBaud
for use in broadband test setups and telecom transmission systems. Up to six single ended serial data
streams are accepted by the DAC and converted into one differential 64-level data signal. By using lessthan six input ports it is possible to generate 2-level NRZ as well as 4, 8, 16 or 32-level output signals.
With a programmable SHF BPG (e.g. SHF 12104 A or SHF 12105 A) one has full control of thepatterns into the DAC. Therefore our BPG/DAC combination can be seen as a full blown remote head
non-interleaved 60 GBaud Arbitrary Waveform Generator (AWG).
A single ended clock signal with the same frequency as the data rate is required to drive theSHF 614 C. For data regeneration purposes all input data signals are re-sampled to mitigate any signal
impairments resulting e.g. from long cables. Therefore, it becomes possible to place the DAC very
close to the DUT. Clock input port and data output ports are AC-coupled. Data input ports are DCcoupled.

Features






Broadband operation up to 60 GBaud
Output baud rate = sample rate
Differential data output, 3.0 V differential output swing (1.5 V in single-ended operation)Single ended clock and data inputs
Latched input ports
Output amplitude & input threshold level control (remote by software)

Applications
100, 200, 400 Gbps and 1 Tbps system evaluation & development
Broadband test and measurement equipment
PAM-N, OFDM, Advanced Modulation Experiments

Block Diagram
OutOutSHF
614 C

6-Bit DAC

USB/LAN

D5(MSB)

D4

D3Clk

D2

D1

D0(LSB)Power
SupplySHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018

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Ease of Use
The SHF 614 C DAC module, the power supply and cooling measures are housed in a small benchtop
case which can be embedded easily in the customer’s test environment. It is to be connected to acomputer either by Ethernet or USB.

Fig. 2: SHF 614 C
The DAC is controlled by the easy to use SHF Control Center (SCC) software package.The software
reads the individual calibration tables of the DAC and sets the contribution of the bias voltages
accordingly. The amplitude of the individual eye openings as well as the input threshold level for theDC-coupled data inputs can be set and is displayed in the graphical user interface (GUI). This enables
the user to generate a perfect signal with a few intuitive clicks.
This SCC software interface does further support the user in case the SHF 614 C DAC is connected toanother SHF instrument. For example, if the DAC is connected to a SHF 12105 A Bit Pattern Generator(BPG) the software unifies the two discrete instruments to one single Arbitrary Waveform Generator(AWG). The user can program any signal trace desired at the DACs output; the SCC automaticallytranslates the desired output waveform to the six individual binary patterns which are stored in theBPGs user pattern memory and sent to the DACs inputs.

Fig. 3: Connection diagram of BPG to DAC of the SCC
SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018

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Absolute Maximum Ratings
Parameter

Unit

SymbolMin.

Typ.

Max.

Comment

Data Input Voltage

mV

Vdata in900

Peak-to-Peak

Clock Input Voltage

mVVclk in900

Peak-to-Peak

External DC Voltage onRF Clock Input PortV

VDCin-10+10AC coupled input

External DC Voltage on
RF Data Input Ports

VVDCin-0.50

DC coupled inputs

External DC Voltage on
RF Output Ports

VVDCout-10+10

AC coupled outputs

DC Supply Voltage

VVcc

UnitSymbol

Min. Input Data Rate

Gbps

Rin,minMax. Input Data Rate

Gbps

Rin,max

60

Data Input Voltage

mVVdata in

300

800

Eye Amplitude;
500 mV recommended

External DC Voltage on
RF Data Input Ports

VVDCin-0.50

DC coupled inputs

Min. Clock Input Frequency

GHzfin,min

Max. Clock Input Frequency

GHzfin,max

60

Clock Input Voltage

mVVclk in300800Peak-to-Peak;
500 mV recommended

External DC Voltage on
RF Clock Input PortVVDCin-10+10AC coupled input

Input Parameters

13.0

Specifications
Parameter

Min.

Typ.

Max.

CommentInput Parameters
11

SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018

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Parameter

Unit

SymbolMin. Output Data Rate

GBaudRout,minMax. Output Data Rate

GBaud

Rout,max

Min.

Typ.

Max.

Comment

Output Parameters

Output Voltage

mVVoutRise / Fall Time

pstr / tf

Equivalent Output BandwidthGHzBW

Differential Output Skew

pstskew

Supply Voltage

VVc

Supply Current

mA

Power Dissipation

160

1300

1512

8.2

22Eye Amplitude;
Single ended;
Full scale;
Adjustable up to -6 dB
 see page 71020%...80%;
1deconvolved
Derived from Rise Time
2using formula ;-3 dB bandwidth

27±1±2+12+12.5

Ic

1350

1450

W

Pd

16.2

17.4°C

Tcase

Power Requirements+11.5

2.1 mm DC Power Jack

@ VC = +12V

Conditions
Module Temperature

31045

1

Calculation based on typical rise / fall times from oscilloscope data sheet: 𝑡𝑟 𝑑𝑒𝑐𝑜𝑛𝑣𝑜𝑙𝑣𝑒𝑑 = √(𝑡𝑟 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑 )2 − (𝑡𝑟 𝑜𝑠𝑐𝑖𝑙𝑙𝑜𝑠𝑐𝑜𝑝𝑒 )2 = √(𝑡𝑟 𝑚𝑒𝑎𝑠. )2 − (3.68 𝑝𝑠)22

Calculation based on formula: 𝐵𝑊 =30,22𝑇𝑟tr / tf of the output data signal can be slightly decreased by applying additional cooling measures like heat sinks or cooling fans.

SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018

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Typical Output Amplitudes
Below mentioned values assume no attenuation to be set in the control software. The output amplitudeof the DAC can be reduced by 0 to 6 dB by making the appropriate setting in the control software.

Input D5

Input D4

Input D3

Input D2

Input D1

Input D0

Typical Output
Amplitude [mV]

-----

On

24-

--

-

On-

48-

--

On-

-

96

-

-

On--

-

192

-

On---

-

384

On-

----

768

The typical output amplitude of a multilevel signal can be calculated by accumulating the typical output
amplitudes of all applied input ports of the DAC as shown in the table above. Thus the full scale outputswing (all inputs active) accumulates as follows:
OnOn

On

On

On

On

1512

SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018

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Typical Output Eye Diagrams
31

The measurements below had been performed using a SHF 12104 A Bit Pattern Generator (PRBS 2 1) and a Tektronix DSA 8300 Digital Serial Analyzer (DSA) with Phase Reference Module (82A04B60G) and 70 GHz Sampling Module (80E11). The outputs of the DAC module had been connected
directly to the DSA input with a 10 dB attenuator.

4-Level Output Signal Measurement

Out @ 60 GBaud

Out @ 56 GBaud

Out @ 43 GBaud

Out @ 32 GBaud

Out @ 10 GBaud

SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018

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8-Level Output Signal Measurement

Out @ 60 GBaud

Out @ 56 GBaud

Out @ 43 GBaud

Out @ 32 GBaud

Out @ 10 GBaud

SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018

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16-Level Output Signal Measurement

Out @ 43 GBaud

Out @ 32 GBaud

Out @ 20 GBaud

Out @ 10 GBaud

32-Level Output Signal Measurement

Out @ 10 GBaud

Out @ 2 GBaud

SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018Page 9/11

Arbitrary Waveform Generation (4-Bit Mode)

Sine @ 60 GBaud

Saw @ 60 GBaud

Triangle @ 60 GBaud

Stepped Eye @ 60 GBaud“SHF”- writing @ 60 GBaud

SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018 Page 10/11

Outline Drawing – SHF 614 C
SHF 614 C

6-Bit Digital to Analog Converter

PowerOutputsOnOff50.9Error

OutOut1.8 Vpp Max

1.8 Vpp Max

50  / 1.85 mm Female

221.4

145.4
130.4
115.4
100.4
85.4
70.4
55.4

7.2

28.6

8.9

177

9 8 7 6 5 4 3

185.2
95.2

228.5cadb
50  / 1.85 mm Female

Ethernet
12 V / 2APos.

Designation

Connector

1DAC Ouput

1.85mm (V) Female

2DAC Ouput

1.85mm (V) Female

34D5 Input
D4 Input

1.85mm (V) Female
1.85mm (V) Female-0.9 V < Vin < +0.4 V

0.9 Vpp Max

USBD5D4Pos.

Designation

5D3 Input

1.85mm (V) Female

aGND

6

D2 Ouput

1.85mm (V) FemalebMini USB

7D1 Input

1.85mm (V) FemalecEthernet RJ45

8D0 Input

1.85mm (V) Female

dPower Supply

9Clock Input

1.85mm (V) Female

D3

D2

D1

D0Clk

all dimensions in mm

SHF reserves the right to change specifications and design without notice - SHF 614 C - V001 – August 07, 2018 Page 11/11