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 611 F
32 GBaud 3-Bit DAC

SHF reserves the right to change specifications and design without notice - SHF 611 F - V001 – December 07, 2017 Page 1/10

Description
The SHF 611 F is a 3-Bit Digital-to-Analog Converter (DAC) operating at symbol rates up to
32 GBaud for use in broadband test setups and telecom transmission systems. Three single ended
serial data streams of up to 32 Gbps are accepted by the DAC and converted into one differential 8level data signal of up to 32 GBaud. 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
611 F. Thus the baud rate of the resulting PAM signal is as fast as the sample rate of the system.
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 32 GBaud
Output baud rate = sample rate
Differential data output, 600 mV single ended output swing
Single ended clock and data inputs
Latched input ports
Output level control
Bias BoxApplications


100G, 200G and 400G system evaluation & development
OC-768 / STM-256 applications
Telecom transmission

Fibre Channel
Broadband test and measurement equipment®

Block DiagramOutOutSHF611 F

D1D2(MSB)

3-Bit DACClk

D0(LSB)
Bias 1/2 (D0...D2) Vee6BiasBoxUSB®

+12V

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

SHF reserves the right to change specifications and design without notice - SHF 611 F - V001 – December 07, 2017 Page 2/10

Bias BoxAt delivery, the Bias Box SHF 88120 B is mounted on a common base plate, together with the SHF
611 F 3-Bit DAC (Fig.1). All bias voltages are provided by this Bias Box which is controlled by a PC
via a USB interface. The easy to use software package is a complementary part of each delivery.
For system applications it is possible to remove the Bias Box. In that case the operating voltages
have to be supplied by the customer’s circuitry.
It is recommended to use the Bias Box only with the delivered power supply. Using other power
supplies can damage the Bias Box.

Fig. 1: “SHF 611 F + Bias Box”- Assembly

SHF 600 Series Control - Software
At delivery, the software package for a MS Windows installation including a 1.5m USB cable will beprovided. Control software for other operating systems is available on request.

Fig. 2: “SHF 600 Series Control” – GUIHeat Sink
The provided heat sink can be disassembled by the customer. In this case it is required to provide
other cooling measures to ensure that the maximum case temperature specified on page 4 will notbe exceeded.
SHF reserves the right to change specifications and design without notice - SHF 611 F - V001 – December 07, 2017 Page 3/10

Specifications
Parameter

Unit

Symbol

Min.

Typ.

Max.

Data Input Voltage

mVpp

Vdata in300

500

800

Clock Input FrequencyGHzfin

Clock Input VoltagemVpp

Vclk inMinimum Output Data Rate

GBaudRout,min

Maximum Output Data Rate

GBaudRout,max

32

Output Amplitude

mVVout525

Rise- / Fall Time

pstr/tf

Equivalent Output Bandwidth

GHzBW

22

27+11.5+12+12.5
540

Comment

Input Parameters
Clock input
amplitude = 500mV
Equates to the output
data rate
300

500

800

Data input
amplitude = 500mV

Output Parameters
1630

805

Single ended, full scale,adjustable up to -6dB,
see table on page 581020%...80%,
1deconvolved
Derived from Rise Time
2using formula ,-3 dB bandwidthPower Requirements (incl. Bias Box)
Supply Voltage

VVee

Supply Current

mA

Iee

520

Power Dissipation

WPd

6.2

@ VEE = +12V

Power Requirements (DAC-Module only)
Supply Voltage

VVee

Supply Current

mA

Power Dissipation-5.2-5-4.8

Iee

1000

1100

W

Pd

5

Bias Adjust 1 for D0, D1 & D2

V

VBias1-3.30

Bias Adjust 2 for D0, D1 & D2

V

VBias2

-3.3

0°C

Tcase

1045

@ VEE = -5V

Bias Voltages

Conditions
Case Temperature

31Calculation 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 611 F - V001 – December 07, 2017 Page 4/10

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.

Output Amplitude
Input D2(MSB)

Input D1

Input D0(LSB)

Minimum Output
Amplitude [mV]Maximum Output
Amplitude [mV]

--

On

75

115

-

On

-

150

230

On-

-

300

460

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

OnOnOn525

805

SHF reserves the right to change specifications and design without notice - SHF 611 F - V001 – December 07, 2017 Page 5/10

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 6 dB attenuator.

4-Level Output Signal Measurement

Out @ 32 GBaud

Out! @ 32 GBaud

Out @ 28 GBaud

Out! @ 28 GBaud

Out @ 20 GBaud

Out! @ 20 GBaud

SHF reserves the right to change specifications and design without notice - SHF 611 F - V001 – December 07, 2017 Page 6/10

8-Level Output Signal Measurement

Out @ 32 GBaud

Out! @ 32 GBaud

Out @ 28 GBaud

Out! @ 28 GBaud

Out @ 20 GBaud

Out! @ 20 GBaud

SHF reserves the right to change specifications and design without notice - SHF 611 F - V001 – December 07, 2017 Page 7/10

Outline Drawing - Modulebcdefghij

4.6

9.1

14.8
9.7
9.1a3.8
5.08
4x 5.08

GND109.1

9.1
21

12.3

4x Ø2.7
OUT

D2(MSB)

6OUT

D13SHF 611 F
3-Bit DAC

48453929

XXXXXSHF AG Berlin

39

D0(LSB)

5Clk

Bias1
D2Bias1
D1Bias2
D2Bias2
D1-5V

4.7

3

Bias1
D0
Bias2
D019428
34
40

19.5

9.5

9.5

All dimensions in mm

PortabDesignation

Bias 1
DOcde

Bias 1 Bias 1
D2
D1fg

Bias 2
DO123

456Designation

OutOut

D1Clk

D0

D2(LSB)(MSB)

1.85mm (V) Femalei

Bias 2 Bias 2D2D1PortConnectorhj-5V

2.92mm (K) Female

SHF reserves the right to change specifications and design without notice - SHF 611 F - V001 – December 07, 2017 Page 8/10

Outline Drawing – “Module + Bias Box”- AssemblyUSB

12V DC

Module15.1

4x Ø3.4

OUT

15.1

OUT

D2(MSB)D1

SHF 611 F
3-Bit DAC

D0(LSB)

XXXXX

Bias1
D2

Bias1
D1

Bias2
D2

Bias2
D1-5V

SHF

Communication
Technologies AG

102
92

Bias1
D0
Bias2
D0Clk118112

82102123.4

SHF AG Berlin

SHF 88120 B
Bias BoxXXXXXUSB

Baseplate

12V DC4046

3.66Bias Box

471025.632.7

All dimensions in mm

SHF reserves the right to change specifications and design without notice - SHF 611 F - V001 – December 07, 2017 Page 9/10

38.5
37

Outline Drawing – “Module + Bias Box”- Assembly withHeat Sink

52.7
501021.1

21.1
6Heatsink

OUT

Base plate

OUT

D2(MSB)D1

SHF 611 F
3-Bit DAC

D0(LSB)

XXXXX

Bias1
D0

Bias1
D2

Bias1
D1

Bias2
D0

Bias2
D2

Bias2
D1

Clk-5V7083

SHF

Communication
Technologies AG10393120103

124.4

SHF AG Berlin

SHF 88120 BBias Box
XXXXX

USB

12V DC120

All dimensions in mm

SHF reserves the right to change specifications and design without notice - SHF 611 F - V001 – December 07, 2017 Page 10/10