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 615 B
60 GBaud 3-Bit DAC

SHF reserves the right to change specifications and design without notice - SHF 615 B - V003 – February 23, 2017 Page 1/14

Description
The SHF 615 B is a 3-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 three single
ended 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 B.
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 DC-coupled.

FeaturesBroadband operation up to 60 GBaud
Output baud rate = sample rate
Differential data output, 4.8 V differential output swing (2.4 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-4, PAM-8, Advanced Modulation Experiments

Options
Option Case:

DAC module, power supplies, heat sink and 1.85 mm panel adaptors
are housed in a small benchtop case.

Block Diagram
OutOutSHF
615 B

3-Bit DACPower Supply+ USB/Control

D2 D1(MSB)

D0 Clk(LSB)

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Module Variants
In addition to the DAC itself, the power supplies, USB cable and heat sink are complementaryparts of each delivery. It is recommended to use the DAC only with the delivered power supply
module. The heat sink can be removed by the customer. In this case it is required to provide
other cooling measures to ensure that the maximum case temperature specified on page 6 will
not be exceeded.

SHF 615 B

With Option Case the SHF 615 B DAC module, the power supplies, heat sink and the Mini-SMP
to 1.85 mm panel adaptors are housed in a small benchtop case that can be easily embedded inthe customer’s test environment.

SHF 615 B – incl. Opt. CaseSHF reserves the right to change specifications and design without notice - SHF 615 B - V003 – February 23, 2017 Page 3/14

Ease of Use
The easy to use software package, SHF 600 Series Control is the most convenient way to control theDAC. The software reads the individual calibration tables of the DAC and sets the contribution of thebias voltages accordingly. The amplitude of the individual eye openings can be set and is displayed in
the graphical user interface (GUI) as well as the input threshold level for the DC-coupled data inputs.
This enables the user to generate a perfect signal just by a few intuitive clicks. The control software forother operating systems is available on request.

Fig. 1: “SHF 600 Series Control” – GUISHF reserves the right to change specifications and design without notice - SHF 615 B - V003 – February 23, 2017 Page 4/14

Absolute Maximum Ratings
Parameter

Unit

Symbol

Min.

Typ.

Max.

Comment

Data Input Voltage

mV

Vdata in900

Peak-to-Peak

Clock Input VoltagemV

Vclk in900

Peak-to-Peak

External DC Voltage on
RF Clock Input Port

V

VDCin

-10+10AC coupled input

External DC Voltage on
RF Data Input Ports

VVDCin-0.6+0.05

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,minMax. Clock Input Frequency

GHzfin,max60

Clock Input Voltage

mVVclk in

300

800

Peak-to-Peak;
500 mV recommended

External DC Voltage on
RF Clock Input Port

VVDCin-9+9AC coupled inputInput Parameters

13.0

Specifications
Parameter

Min.

Typ.

Max.

Comment

Input Parameters
1621

SHF reserves the right to change specifications and design without notice - SHF 615 B - V003 – February 23, 2017 Page 5/14

Parameter

Unit

SymbolMinimum Output Data Rate

GBaud

Rout,minMaximum Output Data Rate

GBaud

Rout,max

Min.

Typ.

Max.

Comment

Output Parameters
160

Output Voltage

mV

Vout

2200

External DC Voltage on
RF Output PortsV

VDCout-9

Rise / Fall Time

pstr

Equivalent Output BandwidthGHzBW62
Eye Amplitude;
Single ended;
Full scale;
Adjustable up to -6 dB see page 72415

7.12431+11.5+12+9AC coupled outputs

9.320%...80%;
1deconvolved
Derived from Rise Time
2using formula ;-3 dB bandwidthPower Requirements (incl. Power Supply)Supply Voltage

VVc

Supply Current

mA

Ic

650

Power Dissipation

WPd

7.8+12.5

2.1 mm DC Power Jack

@ VC = +12V

Power Requirements (with Option Case)
Supply Voltage

VVc

Supply Current

mA

Power Dissipation+11.5+12+12.5

Ic

850

950

WPd

10.2

11.4°CTcase

2.1 mm DC Power Jack

@ VC = +12VConditions
Case Temperature

31045

1Calculation 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
3

Calculation based on formula: 𝐵𝑊 =0,22
𝑇𝑟

tr / 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 615 B - V003 – February 23, 2017 Page 6/14

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 controlsoftware.
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

SHF reserves the right to change specifications and design without notice - SHF 615 B - V003 – February 23, 2017 Page 7/14

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 B - V003 – February 23, 2017 Page 8/14

8-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 B - V003 – February 23, 2017 Page 9/14

Typical Output Eye Diagrams
The measurements below had been performed using a SHF 12104 A Bit Pattern Generator (PRBS312 -1) and an Agilent Digital Communication Analyzer (DCA) with Precision Timebase Module(86107A) and 70 GHz Sampling Module (86118A). The outputs of the DAC module had beenconnected directly to the DCA 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 B - V003 – February 23, 2017 Page 10/14

8-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 B - V003 – February 23, 2017 Page 11/14

Outline Drawing – Module

35.6

4x M2.5x5mm

612.4

6.3

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.

Out43163

Out3-Bit DAC

MiniSMP (GPPO) MaleSHF 615 B

1.85mm (V) female

D0D2D0Clk
D1Out

Power+ CTRL

1.85mm (V) female

Communication
Technologies AGConnector

OutSHFPort

40.24030

16.3
65

SHF reserves the right to change specifications and design without notice - SHF 615 B - V003 – February 23, 2017 Page 12/14

Outline Drawing – Module with Heat Sink

OutOutPower Supply & Control (I2C-Bus)4536
12Power Supply & Control (I2C-Bus)SHF

OutOutCommunication
Technologies AG3-Bit DAC

43163

SHF 615 B

Power+ CTRL

D2D0Clk
D1PortConnector

PinColour

Designation

Out

1.85mm (V) female

1brownSCLOut

1.85mm (V) female

2whiteVcc

D0

MiniSMP (GPPO) Male

3blueGND

D1

MiniSMP (GPPO) Male

4blackVee

D2

MiniSMP (GPPO) Male

5greySDAClk

MiniSMP (GPPO) Male

6pink

GND

All dimensions in mm.

88.5

2535

24.6

3x3.6
48.7

14.7

D1Clk
D0
D2

14.6
8.5

SHF
Power+ CTRL

Communication
Technologies AG43163

SHF 615 B 3-Bit DAC

12.4

640.2

65

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50.8

Outline Drawing – SHF 615 B with Option Case

221.4d6 x 15mm
1528.63521685.2

8.9

17747.2

70.4

1028.5cbaPos.

Designation

Connector

Pos.

1

Data Out1.85mm (V) FemaleaDesignation
GND2

Data Out1.85mm (V) Female

bPower Supply

3Clock In

1.85mm (V) Female

cUSB

4D0

1.85mm (V) Female

dGND

5

D1

1.85mm (V) Female

6D2

1.85mm (V) Female

SHF reserves the right to change specifications and design without notice - SHF 615 B - V003 – February 23, 2017 Page 14/14