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 614 A
60 GBaud 6-Bit DAC

SHF reserves the right to change specifications and design without notice - SHF 614 A - V002 – November 13, 2015 Page 1/14

Description
The SHF 614 A 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) you have full control of the patterns 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 the SHF 614
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. 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, 2.8 V differential output swing (1.4 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-N, OFDM, Advanced Modulation Experiments

Options
Option Case:

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

Block Diagram
OutOutSHF
614 A

6-Bit DAC

USB/CTRL

D5(MSB)D4 D3 Clk D2

D1 D0(LSB)

PowerSupply

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Module Variants
In addition to the DAC itself, the power supplies, USB cable and heat sink are complementary parts ofeach delivery. It is recommended to use the DAC only with the delivered power supply module. Theheat 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 6 will not be exceeded.

SHF 614 A

With Option Case the SHF 614 A DAC module, the power supplies, cooling measures and the MiniSMP to 1.85 mm panel adaptors are housed in a small benchtop case that can be easily embedded in
the customer’s test environment.

SHF 614 A – incl. Opt. Case

11The cables are not part of the delivery and must be ordered separately

SHF reserves the right to change specifications and design without notice - SHF 614 A - V002 – November 13, 2015 Page 3/14

Ease of Use
The easy to use software package, 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 of the bias
voltages accordingly. The amplitude of the individual eye openings can be set and is displayed in thegraphical 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 for otheroperating systems is available on request.

Fig. 2: “SHF 600 Series Control” – GUISHF reserves the right to change specifications and design without notice - SHF 614 A - V002 – November 13, 2015 Page 4/14

Absolute Maximum Ratings
Parameter

Unit

Symbol

Min.

Typ.

Max.

Comment

Data Input Voltage

mV

Vdata in900

Peak-to-Peak

Clock Input Voltage

mVVclk 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

V

VDCin

-0.50

DC coupled inputs

External DC Voltage on
RF Output PortsV

VDCout-10+10AC coupled outputs

DC Supply Voltage

V

Vcc

Unit

SymbolMin. 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,max60

Clock Input Voltage

mVVclk in

300

800

Peak-to-Peak;
500 mV recommended

External DC Voltage on
RF Clock Input PortV

VDCin-10+10AC coupled input

Input Parameters13.0Specifications
Parameter

Min.

Typ.

Max.

CommentInput Parameters
11SHF reserves the right to change specifications and design without notice - SHF 614 A - V002 – November 13, 2015 Page 5/14

Parameter

UnitSymbol

Min. Output Data Rate

GBaudRout,minMax. Output Data Rate

GBaudRout,maxMin.

Typ.

Max.

CommentOutput Parameters

Output Voltage

mVVoutRise / Fall Time

pstr / tf

Equivalent Output Bandwidth

GHzBW

Differential Output Skew

pstskew

160

1200

1386

8.2

22

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

27±1±2+12+12.5

Power Requirements (without Option Case)
Supply Voltage

VVc

Supply Current

mA

Ic

1150

Power Dissipation

WPd

13.8+11.5

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

2.1 mm DC Power Jack

Ic

1350

1450

WPd

16.2

17.4

@ VC = +12V°C

Tcase

45

without Option Case

Conditions
Module Temperature

4102

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)23Calculation based on formula: 𝐵𝑊 =40,22𝑇𝑟tr / 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 A - V002 – November 13, 2015 Page 6/14

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

22---

-

On-

44-

-

-

On-

-

88-

-

On-

--

176

-

On-

-

-

-

352

On-

---

-

704

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:OnOnOnOn

OnOn

1386

SHF reserves the right to change specifications and design without notice - SHF 614 A - V002 – November 13, 2015 Page 7/14

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 @ 64 GBaud

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 A - V002 – November 13, 2015 Page 8/14

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 A - V002 – November 13, 2015 Page 9/14

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 A - V002 – November 13, 2015 Page 10/14

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 A - V002 – November 13, 2015 Page 11/14

Outline Drawing - Module
Power LED

4x M2,5x5mm

Power SupplyControl43945361312943x3.636.6
53.2
62.6

GND

Out

1.85mm (V) female

4blackGND

D0MiniSMP (GPPO) Male

5greyVee

D1MiniSMP (GPPO) Male

6pink

GND

D2MiniSMP (GPPO) Male

D3MiniSMP (GPPO) Male

D4MiniSMP (GPPO) MalePin

Colour

D5MiniSMP (GPPO) Male

1

brown

SCL

Clk

MiniSMP (GPPO) Male

3

blue

GND

Clk

MiniSMP (GPPO) Male

4

blackSDA

Control (I2C-Bus)
Designation

CTRL

blueOut

3

D145

1.85mm (V) female

D2
D1
D0nc

Vcc

OutOutwhiteClk
Clk

26-Bit DACConnector

Power
SupplyVee

Port

CommunicationTechnologies AGVoltage

brown

SHF

Colour145.2

Pin

All dimensions in mm.

3x3.6

56.8
46.8

Power Supply

SHF 614 A

12.4
45.2

nc
D5
D4
D366.36.4

2112.5

3.6

2387
100

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Outline Drawing – Module with Heat Sink
Power LEDOutOut

Power Supply

Control

44
5

3

61

31

2

Power Supply
PinColour

Voltage1brownVee

PowerSupply

nc
D5
D4
D3Clk
Clk

D2
D1
D0nc

CTRLSHF

OutOutCommunication
Technologies AG6-Bit DAC

SHF 614 A

D145

PortConnector

2whiteVcc

Out

1.85mm (V) female

3blue

GNDOut1.85mm (V) female

4blackGND

D0MiniSMP (GPPO) Male

5greyVee

D1

MiniSMP (GPPO) Male

6pink

GND

D2

MiniSMP (GPPO) Male

D3

MiniSMP (GPPO) Male

D4

MiniSMP (GPPO) Male

PinColour

D5

MiniSMP (GPPO) Male

1

brown

SCL

Clk

MiniSMP (GPPO) Male

3

blue

GND

Clk

MiniSMP (GPPO) Male

4

blackSDA

Control (I2C-Bus)
Designation

43.253.2

121

All dimensions in mm.

3x3.6 3.6 3x3.6

1326.643.2
52.6

SHF

14.7

D3
D4
D5ncClkClk

Power Supplync
D0
D1
D2

14.6
8.5

CTRL

Communication
Technologies AG

D145

SHF 614 A 6-Bit DAC

12.4

645.2

77100

SHF reserves the right to change specifications and design without notice - SHF 614 A - V002 – November 13, 2015 Page 13/14

50.8

Outline Drawing – SHF 614 A with Option Case

221.4
d6 x 15mm
1528.635 67 89177

4

7.2

55.4

2

1

8.9

85.2

1028.5
cba

Pos.
1

Designation
Data OutConnector
1.85mm (V) Female

Pos.
aDesignation
GND234Data Out
Clock In
D01.85mm (V) Female
1.85mm (V) Female
1.85mm (V) Female

bcdPower SupplyUSBGND5678D1D2D3
D41.85mm (V) Female
1.85mm (V) Female
1.85mm (V) Female
1.85mm (V) Female

9D5

1.85mm (V) Female

SHF reserves the right to change specifications and design without notice - SHF 614 A - V002 – November 13, 2015 Page 14/14