Data Sheet SHF C911 A
SHF Communication Technologies AG

Data SheetSHF C911 A

32 / 67 GBaud 4-Bit DAC

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 1

Data Sheet SHF C911 A
SHF Communication Technologies AGDescription
The SHF C911 A is a 4-Bit Digital-to-Analog Converter (DAC) operating at symbol rates either up to 32 or 67
GBaud for use in broadband test setups and telecom transmission systems. Four single ended serial data
streams of up to 32 or 67 Gbps are accepted by the DAC and converted into one differential 16-level data
signal of up to 32 or 67 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 C911 A. 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. Clockinput port and data output ports are AC-coupled. Data input ports are DC-coupled.

Features

Broadband operation up to 32 or 67 GBaud

Output baud rate = sample rate

Differential data output, 570 mV single ended output swingSingle ended clock and data inputs

Latched input ports

Output level control

Controlled by intuitive graphical user interface SHF Control Center (SCC) via USB

Applications


100G, 200G and 400G system evaluation & development

OC-768 / STM-256 applications

Telecom transmission

Fibre Channel®

Broadband test and measurement equipment

Configurations


32: Operation up to 32 GBaud

67: Operation up to 67 GBaud®

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

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 2

Data Sheet SHF C911 A
SHF Communication Technologies AGAccessories
+12 V Power Supply Desktop Adapter

Mini-USB cableFunctional earth cable  Connection to test setup ground has to be set up first before any otherconnection to prevent instrument damage!

Block Diagram

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 3

Data Sheet SHF C911 A
SHF Communication Technologies AG

Ease of Use
The SHF C911 A DAC module including the power supply and the cooling measures can easily beembedded in the customer’s test environment. It is to be connected to a computer by USB. At delivery theDAC module is mounted and connected to an active heat sink. The heat sink fans are regulated andpowered by the DAC module. The DAC may also be used without the delivered heat-sink in case otheradequate cooling measures are provided.

Fig. 2: SHF C911 A

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 the DC-coupled data
inputs can be set and is displayed in the graphical user interface (GUI). This enables the user to generate aperfect signal with a few intuitive clicks.
This SCC software interface does further support the user in case the SHF C911 A 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 multi-level source. The user canprogram the signal desired at the DACs output; the SCC automatically translates the desired output multilevel pattern to the four individual binary patterns which are stored in the BPGs user pattern memory andsent to the DACs inputs.

Fig. 3: SHF Control Center – GUI for the SHF C911 A

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 4

Data Sheet SHF C911 A
SHF Communication Technologies AG

Specifications
Absolute Maximum Ratings
Parameter

Unit

SymbolData Input Voltage

mVClock Input Voltage

MinTypMax

Comment

Vdata in950

Peak-to-PeakmV

Vclk in950

Peak-to-Peak

External DC Voltage on
RF Clock Input Port &Data Output Ports

VVDCin-10+10AC coupled ports

External DC Voltage on
RF Data Input Ports

VVDCin-0.6+0.1

DC coupled inputs

DC Supply Voltage

VVcc

Parameter

Unit

SymbolMin. Input Data Rate

Gbps

Rin,min14Input Parameters
MinTypMax

Comment5167

Configuration 67

1Configuration 32

Max. Input Data Rate

GbpsRin,max

Data Input Voltage

mVVdata in

200850Eye amplitude

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

Clock Input Voltage

mVVclk in

200

900

Peak-to-Peak

External DC Voltage on
RF Clock Input PortVVDCin-9+9

AC coupled input

32567

Configuration 6732

Configuration 32

1The upper baud rate limit is defined by the absence of errors (BER < 10-12) of a NRZ output. The DAC operates beyond this limit as shown in the typical eye diagrams
below.

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 5

Data Sheet SHF C911 A
SHF Communication Technologies AG

Output Parameters
Parameter

Unit

SymbolMin. Output Data Rate

GBaud

Rout,minMax. Output Data Rate

GBaud

Rout,max

Output Voltage

mVRise / Fall TimepsVoutMinTypMax5672Configuration 67322Configuration 32520

Eye amplitude;Single ended;
AC coupled;
Full scale;
Adjustable up to -6 dB
6.8

Configuration 67

8.2

Configuration 32

tr / tf

Equivalent Output
BandwidthGHzBW

Differential Output Skew

pstskew

Unit

SymbolSupply Voltage

VVcc

Supply Current

A

Icc

Comment

20%...80%;
Full scale;3
deconvolved
32

Configuration 67

27

Configuration 32
Derived from Rise Time
4
using formula ;-3 dB bandwidth
12

Min

TypMax+11.5+12.0+12.5

Power Requirements
Parameter

Power Dissipation

WPdComment0.86

Without heat sink

0.96

With heat sink

10.3

Without heat sink

11.5With heat sink
@ VCC = +12 V

23The upper baud rate limit is defined by the absence of errors (BER < 10-12) of a NRZ output.
Calculation based on typical rise / fall times from oscilloscope data sheet and with a NRZ output generated by bit synchronization of the MSB + LSB

𝑡𝑟 𝑑𝑒𝑐𝑜𝑛𝑣𝑜𝑙𝑣𝑒𝑑 = √(𝑡𝑟 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑 )2 − (𝑡𝑟 𝑜𝑠𝑐𝑖𝑙𝑙𝑜𝑠𝑐𝑜𝑝𝑒 )2 = √(𝑡𝑟 𝑚𝑒𝑎𝑠. )2 − (3.68 𝑝𝑠)24

Calculation based on formula: 𝐵𝑊 =

0,22
𝑇𝑟

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 6Data Sheet SHF C911 A
SHF Communication Technologies AG

Integrated Fan Control5
Parameter

Unit

SymbolMin

Typ

Output Voltage Fan

V

VFan+12V+12

Output Current Fan

AIFan+12V

0.13

Input Tacho Fan

V

VFan Tacho

3.3

Unit

SymbolMax

Comment
30 Hz – PWM-Signal

Mechanical Characteristics
Parameter

Min

TypMaxComment
Configuration 67:
1.85 mm (V) female

Clock In

Ω

50
Configuration 32:
2.92 mm (K) female
Configuration 67:
1.85 mm (V) female

Data InΩ

50
Configuration 32:
2.92 mm (K) female
Configuration 67:
1.85 mm (V) female

Data OutΩ50Configuration 32:
2.92 mm (K) female

Dimensions

mmWeightg

See Outline Drawing on pages 20 - 23
190

Without heat sink

480

With heat sinkConditions

5Parameter

Unit

SymbolMin

Operating Temperature°C

Tambient

15TypMax

Comment

35

It is necessary to operate the module with the supplied heat sink and fan or an adequate cooling measure

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 7

Data Sheet SHF C911 A
SHF Communication Technologies AG

Output Amplitudes
Below mentioned values assume no attenuation to be set in the control software. The output amplitude ofthe DAC can be reduced by 0 to -6 dB by making the appropriate setting in the control software.
Output Amplitude
Input D3(MSB)

Input D2

Input D1

Input D0(LSB)

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

---

On

30

45-

-

On-

70

90-

On-

-

140

180

On-

--

280

360

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

520

675

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 8

Data Sheet SHF C911 A
SHF Communication Technologies AG

Typical Output Waveforms – Configuration 67
The measurements below had been performed using a SHF 12105 A Bit Pattern Generator (PRBS 231-1) anda 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 been connected directly to the DSA input
with a 10 dB attenuator. In all measurements the most significant bits have been used,i.e. 4-Level = D3,D2, 8-Level = D3,D2,D1 and 16-Level = D3,D2,D1,D0.

4-Level Output Signal Measurement

Out @ 67 GBaud

Out! @ 67 GBaud

Out @ 64 GBaud

Out! @ 64 GBaud

Out @ 60 GBaud

Out! @ 60 GBaud

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 9

Data Sheet SHF C911 A
SHF Communication Technologies AG

4-Level Output Signal Measurement

Out @ 50 GBaud

Out! @ 50 GBaud

Out @ 32 GBaud

Out! @ 32 GBaud

Out @ 5 GBaud

Out! @ 5 GBaud

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 10

Data Sheet SHF C911 A
SHF Communication Technologies AG

8-Level Output Signal Measurement

Out @ 67 GBaud

Out! @ 67 GBaud

Out @ 64 GBaud

Out! @ 64 GBaud

Out @ 60 GBaud

Out! @ 60 GBaud

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 11

Data Sheet SHF C911 A
SHF Communication Technologies AG

8-Level Output Signal Measurement

Out @ 50 GBaud

Out! @ 50 GBaud

Out @ 32 GBaud

Out! @ 32 GBaud

Out @ 5 GBaud

Out! @ 5 GBaud

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 12

Data Sheet SHF C911 A
SHF Communication Technologies AG

16-Level Output Signal Measurement

Out @ 67 GBaud

Out! @ 67 GBaud

Out @ 64 GBaud

Out! @ 64 GBaud

Out @ 60 GBaud

Out! @ 60 GBaud

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 13

Data Sheet SHF C911 A
SHF Communication Technologies AG

16-Level Output Signal Measurement

Out @ 50 GBaud

Out! @ 50 GBaud

Out @ 32 GBaud

Out! @ 32 GBaud

Out @ 5 GBaud

Out! @ 5 GBaud

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 14

Data Sheet SHF C911 A
SHF Communication Technologies AG

Output Amplitude Adjustment

64 GBaud @ 460 mV

64 GBaud @ 400 mV

64 GBaud @ 300 mV

64 GBaud @ 200 mV

64 GBaud @ 100 mVSHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 15

Data Sheet SHF C911 A
SHF Communication Technologies AGOutput Signal Speed (Trim) - Adjustment

64 GBaud @ TRIM = 100 %64 GBaud @ TRIM = 80 %64 GBaud @ TRIM = 60 %64 GBaud @ TRIM = 40 %64 GBaud @ TRIM = 20 %64 GBaud @ TRIM = 0 %SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 16

Data Sheet SHF C911 A
SHF Communication Technologies AG

Typical Output Waveforms – Configuration 32
The measurements below had been performed using a SHF 12105 A Bit Pattern Generator (PRBS 231-1) anda 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 been connected directly to the DSA input
with a 10 dB attenuator. In all measurements the most significant bits have been used,i.e. 4-Level = D3,D2, 8-Level = D3,D2,D1 and 16-Level = D3,D2,D1,D0.

4-Level Output Signal Measurement

Out @ 32 GBaud

Out! @ 32 GBaud

Out @ 20 GBaud

Out! @ 20 GBaud

Out @ 5 GBaud

Out! @ 5 GBaud

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 17

Data Sheet SHF C911 A
SHF Communication Technologies AG

8-Level Output Signal Measurement

Out @ 32 GBaud

Out! @ 32 GBaud

Out @ 20 GBaud

Out! @ 20 GBaud

Out @ 5 GBaud

Out! @ 5 GBaud

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 18

Data Sheet SHF C911 A
SHF Communication Technologies AG

16-Level Output Signal Measurement

Out @ 32 GBaud

Out! @ 32 GBaud

Out @ 20 GBaud

Out! @ 20 GBaud

Out @ 5 GBaud

Out! @ 5 GBaud

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 19

Data Sheet SHF C911 A
SHF Communication Technologies AG

Mechanical Drawing - Configuration 67b cdef

g

42.7
46.4

a6.1

6.1
44.2
49.3
52.6
66.6
35.3
25.3

58.5
48.6
35

48.6

3

12.4

6.1

42

D31

D2

Out

Out(MSB)

D15

D06

Clk7(LSB)nc

SHF C911 A

g4-Bit DAC

101

101

XXXXX

86

86

SHF Communication
Technologies AG
Fan+12 V DC +12 V

GND71

USB

60.5

PortConnectoraFunctional earth (FE)

PosPortConnectorbMini-USB

1D2

1.85mm (V) female

cPower-LED

2D3 (MSB)

1.85mm (V) female

dPower3Out

1.85mm (V) female

eFan+12V4Out

1.85mm (V) female

fFan Tacho

5D1

1.85mm (V) female

g

GND

6

D0 (LSB)

1.85mm (V) female

hService7Clk

1.85mm (V) female

all dimensions in mm

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 20

Data Sheet SHF C911 A
SHF Communication Technologies AGMechanical Drawing (Module only) – Configuration 67b cdefg
7.7
11.4aØ2.26.4
43.9
49
52.3
66.4
3525

13.644x3Ø12.4

23.5
13.672.

2

D31

D2OutOut

747165(MSB)

D15D06Clk7(LSB)65

nc5050SHF C911 Ag

354-Bit DAC

XXXXX

SHF Communication
Technologies AGFan

3USB+12 V DC +12 V

GND

365760Pos

PortConnector

1D2

1.85mm (V) female2

D3 (MSB)

1.85mm (V) female

3Out

1.85mm (V) female

4Out

1.85mm (V) female

5

D11.85mm (V) female

6

D0 (LSB)

1.85mm (V) female

7Clk

1.85mm (V) femalePortConnectora

Functional earth (FE)bMini-USBc

Power-LEDdPowere

Fan+12Vf

Fan TachogGNDhService

all dimensions in mm

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 21

Data Sheet SHF C911 A
SHF Communication Technologies AG

Mechanical Drawing – Configuration 32b cdefg

42.7
46.4

a3.3

44.2
49.3
52.6

3.3

35.3
25.3

58.5
48.6
35

48.6
4
9.5

32

D3

1

D2OutOut(MSB)

D15

D06

Clk7(LSB)nc

SHF C911 Ah4-Bit DAC101101

XXXXX

8686

SHF Communication
Technologies AG
Fan+12 V DC +12 V

GND71USB

60.5PortConnector

PosPortConnectora

Functional earth (FE)

1D22.92mm (K) femalebMini-USB

2D3 (MSB)

2.92mm (K) femalecPower-LED

3Out

2.92mm (K) female

dPower4Out

2.92mm (K) femaleeFan+12V

5

D1

2.92mm (K) femalef

Fan Tacho6

D0 (LSB)

2.92mm (K) female

gGND

7Clk

2.92mm (K) female

hService

all dimensions in mm

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 22

Data Sheet SHF C911 A
SHF Communication Technologies AG

Mechanical Drawing (Module only) – Configuration 32b cdefg

7.7
11.4

aØ2.2
3.5

3.5
43.9
49
52.3

23.5
13.6

3525

13.6

4x49.5

72.
Ø

32

D31

D2Out

Out

747165(MSB)

D15

D06

Clk

7(LSB)

65

nc50

50

SHF C911 A

h35

4-Bit DACXXXXXSHF Communication
Technologies AGFan

3USB+12 V DC +12 V

GND

365760PosPortConnector

1

D22.92mm (K) female

2D3 (MSB)

2.92mm (K) female

3Out

2.92mm (K) female

4Out

2.92mm (K) female

5D1

2.92mm (K) female

6D0 (LSB)

2.92mm (K) female

7Clk

2.92mm (K) female

PortConnectoraFunctional earth (FE)bMini-USBc

Power-LEDdPowere

Fan+12Vf

Fan TachogGNDhService

all dimensions in mm

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 23

Data Sheet SHF C911 A
SHF Communication Technologies AG

SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23 D | 12277 Berlin | Germany+49 30 772 051 0sales@shf-communication.com
www.shf-communication.com

SHF reserves the right to change specifications and design without notice
V003 - Feb. 13, 2023 - Page 24