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.de

Preliminary Datasheet
SHF 615 A
60 GBaud 3-Bit DAC

SHF reserves the right to change specifications and design without notice - SHF 615 A - V001 – March 20, 2015

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Description
The SHF 615 A is a 3-Bit Digital-to-Analog Converter (DAC) operating at symbol rates up to60 GBaud for use in broadband test setups and telecom transmission systems. Up to three singleended serial data streams are accepted by the DAC and converted into one differential 8-level
data signal. By using two input ports only it is possible to generate 4-level output signals. A single
ended clock signal with the same frequency as the data rate drives the SHF 615 A.
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.
All RF input and output ports are AC-coupled.

FeaturesBroadband operation up to 60 GBaud
Differential data output, 4.8 V differential output swing (2.4V in single-ended operation)
Single-ended clock and data inputs
Latched input ports
Output level control

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

Block Diagram
OutOutSHF615 A

3-Bit DACPower Supply+ Control

D2 D0 Clk D1(MSB) (LSB)

SHF reserves the right to change specifications and design without notice - SHF 615 A - V001 – March 20, 2015

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Ease of Use
In addition to the DAC itself, the power supply, USB cable, head sink and control software are acomplementary part of each delivery. It is recommended to use the DAC only with the delivered power
supply module.
The easy to use software package, the SHF 600 Series Control, is the most convenient way to control
the DAC. The software reads the individual calibration tables of the DAC and sets the contribution ofthe bias voltages accordingly. The amplitude of the individual eye openings can be set and isdisplayed in the graphical user interface (GUI). The enables the user to generate a perfect signal justby a few intuitive clicks. The control software for other operating systems is available on request.

Fig. 2: “SHF 600 Series Control” – GUI

The heat sink can be removed by the customer. In this case it is required to provide other coolingmeasures to ensure that the maximum case temperature specified on page 4 will not be exceeded.

SHF reserves the right to change specifications and design without notice - SHF 615 A - V001 – March 20, 2015

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Absolute Maximum Ratings
ParameterUnit

Symbol

Min.

Typ.

Max.

Comment

Data Input Voltage

mVpp

Vdata in

900

Clock Input VoltagemVpp

Vclk in

900

External DC Voltage on
RF Input Ports

VVDCin-10+10AC coupled input

External DC Voltage on
RF Output PortsV

VDCout-10+10AC coupled output

VVee
Vcc

-5.0
00+6.0

Unit

SymbolMin.

Data Input Voltage

mVamplVdata in

Clock Input Frequency

GHz

Clock Input Voltage

Input Parameters

DC Supply Voltages(DAC-Module)

Specifications
Parameter

Typ.

Max.

Comment

300

800500 mV recommended

fin

160mVampl

Vclk in300800Minimum Output Data Rate

GBaudRout,min

Maximum Output Data Rate

GbaudRout,max

6062

Output Amplitude

mVamplVout

22002415

ps

tr812101320% / 80%
10% / 90%

pstf

6981120% / 80%
10% / 90%

pstskew±1±2

Input Parameters

500 mV recommended

Output Parameters

1Rise Time
Fall Time1

Differential Output Skew

1

1Single ended, full scale,adjustable up to -6dB,
see page 5

Refers to full scale output swing (measured with a 0101-pattern, phase-synchronized at all data input ports)

SHF reserves the right to change specifications and design without notice - SHF 615 A - V001 – March 20, 2015

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Power Requirements (incl. Power Supply)Supply Voltage

VVc

Supply Current

mAIc

650

Power Dissipation

WPd

7.8+11.5+12+12.5@ VC = +12V

Power Requirements (DAC-Module only)
Supply Voltage

VVee

Supply Current

mA

Iee

Supply Voltage

VVcc

Supply Current

mA

Power Dissipation-4.6-4.4-4.3

1050

1150

+5.3+5.5Icc

320

350

WPd

6.3°C

Tcase+5.2@ VEE = -4.4V,
VCC = +5.3V

Conditions
Case Temperature

2

1045

Typical Output Amplitudes
Below mentioned values assume no attenuation to be set in the control software. The output
amplitude of the DAC can be reduced by 0 to -6 dB by making the appropriate setting in the control
software.
Input D2

Input D1

Input D0

Typical Output
Amplitude [mV]

--

On

345

-

On-

690

On-

-

1380

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 output
swing (all inputs active) accumulates as follows:OnOnOn2415

2Tr / Tf of the output data signal can be slightly decreased by applying additional cooling measures like heat sinks or coolingfans.
SHF reserves the right to change specifications and design without notice - SHF 615 A - V001 – March 20, 2015

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Typical Output Eye Diagrams
The measurements below had been performed using a SHF 12104 A Bit Pattern Generator (PRBS312 -1) and a Tektronix DSA 8300 Digital Serial Analyzer (DSA) with Phase Reference Module(82A04B-60G) and 70 GHz Sampling Module (80E11). The outputs of the DAC module had beenconnected directly to the DSA input with a 20 dB attenuator.

4-Level Output Signal Measurement

Out @ 62 GBaud

Out @ 60 GBaud

Out @ 56 GBaud

Out @ 50 GBaud

Out @ 32 GBaud

Out @ 10 GBaud

SHF reserves the right to change specifications and design without notice - SHF 615 A - V001 – March 20, 2015

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8-Level Output Signal Measurement

Out @ 62 GBaud

Out @ 60 GBaud

Out @ 56 GBaud

Out @ 50 GBaud

Out @ 32 GBaud

Out @ 10 GBaudSHF reserves the right to change specifications and design without notice - SHF 615 A - V001 – March 20, 2015

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Outline Drawing - Module

35.6

4x M2.5x5mm

612.46.3

6.4

2112.560.6

29.6

3x 3.6

40.2

D1

MiniSMP (GPPO) Male

D2

MiniSMP (GPPO) MaleClk

MiniSMP (GPPO) MaleAll dimensions in mm.

Out
D146

Out3-Bit DAC

MiniSMP (GPPO) MaleSHF 615 A

1.85mm (V) female

D0

D2
D0Clk
D1Out

Power+ CTRL

1.85mm (V) female

Communication
Technologies AGConnector

OutSHF

Port40.2

403016.365

SHF reserves the right to change specifications and design without notice - SHF 615 A - V001 – March 20, 2015

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Outline Drawing – Module with Heat Sink

OutOutPower Supply & Control (I2C-Bus)
453612

Power Supply & Control (I2C-Bus)SHF

OutOutCommunication
Technologies AG

3-Bit DACD146

SHF 615 A

Power+ CTRL

D2
D0Clk
D1

Port

Connector

Pin

ColourDesignation

Out

1.85mm (V) female

1brownSCL

Out

1.85mm (V) female

2whiteVcc

D0

MiniSMP (GPPO) Male

3blueGND

D1

MiniSMP (GPPO) Male

4blackVee

D2

MiniSMP (GPPO) Male5greySDA

ClkMiniSMP (GPPO) Male

6pink

GND

All dimensions in mm.

88.5

2535

24.6

3x3.6
48.7

14.7

D1Clk
D0
D214.6
8.5

SHF
Power+ CTRL

Communication
Technologies AG

D146

SHF 615 A 3-Bit DAC

12.4

640.2

65

SHF reserves the right to change specifications and design without notice - SHF 615 A - V001 – March 20, 2015

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