Advanced Science And Novel Technology Company, Inc.
2790 Skypark Drive Suite 112, Torrance, CA 90505

Offices: 310-530-9400 / Fax: 310-530-9402
www.adsantec.com

ASNT6902-MOD56Gbaud PAM4 Data Generator with USB Control
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Adjustable data output amplitude and eye quality
Output data eye cross point adjustment
Internal precision low jitter (below 1ps p-p) frequency synthesizer
Alternate external reference clock input
Differential CML PAM4 data output interface
Can be used as a PRBS Data Generator up to 56Gbaud
Reference clock-divided-by-2 outputs for four external PRBS generators
Precision delay adjustment on clock input
USB port for connection to an external PC
Full functional control from GUI software
Single +12V power supply from an external AC-DC converter
High speed 1.85mm connectors for PAM4 differential data output
Low jitter and limited temperature variation over industrial temperature range

Fig. 1. Front and back views of the unit

Rev. 1.0.2

1July 2019

Advanced Science And Novel Technology Company, Inc.
2790 Skypark Drive Suite 112, Torrance, CA 90505

Offices: 310-530-9400 / Fax: 310-530-9402
www.adsantec.com

DESCRIPTION
The ADSANTEC’s differential PAM4 generator unit can be used for test applications, design verification,and R&D environments. The fully self-sustained device is integrated in a box with power conditioning,control circuitry, and a USB computer interface. All signal I/O’s are CML-type. The front panel of theinstrument is shown in Fig. 1 (top). It includes connectors as described in Table 1.
Table 1. Front-Panel Connectors

Connector
Name
PAM4 DATA OUT P
PAM4 DATA OUT N
CLOCK IN

DESCRIPTION
Type1.85mm
female
2.92mmfemaleDATA IN P11
DATA IN N11DATA IN P12DATA IN N122.92mm
DATA IN P21
femaleDATA IN N21
DATA IN P22
DATA IN N22
CLOCK 1/2 OUT1 Q11, Q12
SMA
CLOCK 1/2 OUT2 Q21, Q22

High-Speed I/Os
DC-coupled CML differential data output port, requires external
SE 50Ohm terminations to groundAC-coupled CML SE clock input port with internal SE 50Ohmterminations to groundDC-coupled CML differential data input ports, requires external
SE 50Ohm terminations to groundAC-coupled CML SE clock output ports, require external SE50Ohm terminations to groundThe back panel of the instrument is shown in Fig. 1 (bottom). It contains a power switch (Power), a power
supply female connector (+9-12V DC) for connecting a male 2.5x5.5-barrel jack from an external AC-DC
adapter (included), and a USB-A connector (USB) for connecting an external PC with installed Windows
GUI control software (USB cable included).

Rev. 1.0.2

2July 2019

Advanced Science And Novel Technology Company, Inc.
2790 Skypark Drive Suite 112, Torrance, CA 90505

Offices: 310-530-9400 / Fax: 310-530-9402
www.adsantec.com
DATA IN1
N11 P11Reference
CLK IN

Frequency
Synthesizer

Phase Shift105ps

Fanout Buffer
1:3Divider/2
USB

DC +9-12VUSBInterfaceoutp-6dB

outn-6dB

Multiplexer

Phase Shift
105ps

Phase Shift
105ps

Q11

HALF RATE CLK OUT 1
Q12Phase Shift
105ps

PAM4 OUT

Phase Shift
105ps

Q21

HALF RATE CLK OUT 2
Q22

outp

Phase Shift105ps

PAM4COMBINER

PAM4 OUT

Divider/2Power Conditioning

N12 P12

Fanout Buffer
1:3

PAM4COMBINER

Multiplexeroutn

N21 P21

N22 P22DATA IN2

Fig.2 Block diagram of the 56Gbaud PAM4 Data Generator with USB control
The system consists of four main parts: Frequency Synthesizer, two high-speed 2:1 Multiplexers, twohigh-speed differential PAM4 combiners, and a Power Supply unit.
The Frequency Synthesizer generates internal clock signals that are used by other parts of the system.
The two incoming pairs of PRBS signals are processed by two 2:1 MUXes to produce two PRBS signals
with doubled data rate. The MUXes also provide the clocks required for the Four-Channel external PRBS
Generator. The clock phases may be individually adjusted in each MUX2:1 module via the system’s USBcontrol interface.
The output signals from 2:1 MUXes are mixed in two PAM4 combiners to form a differential PAM4signal. The output amplitude of this signal may be adjusted. The amplitude of the middle eye opening canbe individually adjusted without affecting the top and bottom eye opening amplitudes. Alternatively, thesystem may be programmed to output high-speed PRBS data instead of PAM4 data through the same I/Os(Fig. 3a).
All the parameters of this PAM4 Generator are controlled by an external PC through a USB port. Aspecial GUI software is installed on the PC to simplify the system control.

Rev. 1.0.2

3July 2019

Advanced Science And Novel Technology Company, Inc.
2790 Skypark Drive Suite 112, Torrance, CA 90505

Offices: 310-530-9400 / Fax: 310-530-9402
www.adsantec.com

ELECTRICAL CHARACTERISTICS
Table 2. PAM4 Generator Specifications

PARAMETER
Vcch
Vccm
Vccl
Vee
Power Consumption
Frequency
JitterData Rate
Maximum
OutputAmplitude
Rise / Fall TimeTDECQ (no FFE)TDECQ (with 5-tap FFE)
Frequency

Rev. 1.0.2

TYPICALUNIT
COMMENT
General Parameters
9-12V
Power Supply
5V
Internal Power Supply
3.3VInternal Power Supply0V
External Ground
22.5
W
Input Reference Clock
1.5-2
GHz
From External Frequency Synthesizer
1ps
Output Data
1-56
Gbaud
1.2
VDifferential pk-pk
8
1.5
1.212-16

psdBdB
Output ClockGHz

4

80%-20%With Rx Optimizer
With Rx Optimizer
Internal Clock divided by 2

July 2019

Advanced Science And Novel Technology Company, Inc.
2790 Skypark Drive Suite 112, Torrance, CA 90505

Offices: 310-530-9400 / Fax: 310-530-9402
www.adsantec.com

(a)

(b)
Rev. 1.0.2

5July 2019

Advanced Science And Novel Technology Company, Inc.
2790 Skypark Drive Suite 112, Torrance, CA 90505

Offices: 310-530-9400 / Fax: 310-530-9402
www.adsantec.com

Fig.3 a). Measured 56 Gb/s NRZ EYE diagram of the ASNT PAM4 Generator unit with TektronixAnalyzer; b) Measured 56 Gbaud/s PAM4 EYE diagram of the ASNT PAM4 Generator unit withTektronix Analyzer

MECHANICAL DIMENSIONSPARAMETER TYP
LengthTBD

UNIT COMMENTS
mm

Width

TBD

mm

Height

TBD

mm

REVISION HISTORY
Revision
1.0.2
1.0.1

Date
07-2019
05-2018

0.0.1

01-2018

Rev. 1.0.2

Changes
Updated Letterhead
Corrected title
Corrected description
Added Table with connector descriptions
Initial Release

6

July 2019