xx
ZZZ
Tektronix
Demo 3 Board
Instruction Manual
www.tek.com
071-2862-02
Copyright © Tektronix. All rights re
owned by Tektronix or its subsidiaries or suppliers, and are protected by national
copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending.
Information in this publication supersedes that in all previously published
material. Specifications and p
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
served. Licensed software products are
rice change privileges reserved.
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product inform ation, sales, service, and technical support:
In North America, call 1-800-833-920 0.
Worldwide, visit www.tek.com to find contacts in your area.
Tektronix Demo 3 Board instruction
The Tektronix Demo 3 Board provides signals that you can use to
demonstrate key waveform triggering and capture features of Tektronix
oscilloscopes.
Environmental considerations
This section provides information about the environmental impact of
the product.
Product end-of-life handling
Observe the following guidelines when recycling an instrument or
component:
ng.
Equipment recycli
extraction and use of natural resources. The equipment may contain
substances that could be harmful to the environment or human health
if improperly han
release of such substances into the environment and to reduce the use
of natural resources, we encourage you to recycle this product in an
appropriate sy
or recycled appropriately.
Production of this equipmen t required the
dled at the product’s end of life. In order to avoid
stem that will ensure that most of the materials are reused
s
This symbol indicates that this product complies with the
applicable European Union requirements according to
Directives 2012/19/EU and 2006/66/EC on waste electrical and
electronic equipment (WEEE) and batteries. For information
about recycling options, check the Tektronix Web site
(www.tektronix.com/productrecycling).
Tektronix Demo 3 Board Instruction Manual 1
TektronixDemo3Boardinstructions
Preventing electrostatic damage
Electrostatic discharge (ESD) can damage components on the demo
board. To prevent, ESD:
Do not touch expo sed components or connector pins unless you
are using ESD protective measures, such as wearing an antistatic
wrist strap.
Handle the demo boar d as little as possible.
Do not slide the demo board over any surface.
Transport and sto re the demo board in a static-protected bag or
container.
Connect power
1. Connect the dual USB A Host connectors into two USB Host ports
on your PC or other USB device. You need to connect both USB A
connectors to provide adequate power to the demo board.
NOTE. The Tektronix Demo 3 board requires approximately 0.8 A to
operate.
2. Connect the single USB B Device connector to the demo board. A
green LED on the board turns on and remains steady when you
apply adequate power to the board.
NOTE. The purpose of the USB cable is to provide power to the demo
board. No communication occurs ove r the USB cable.
All available signals (except for single-shot) are present on their
connecto
button immediately after connecting power. You should also push the
RESET button after connecting a probe or test leads to the demo board
and bef
2 Tektronix Demo 3 Board Instruction Manual
rs when you apply power to the demo board. Push the RESET
ore taking measurements.
Signal locations
The following diagram includes a grid to h elp you locate signal outputs.
To find a particular signal output on the board, look up the connector
grid location in the following Signal Descriptions section and use the
grid location infor mation to find the signal on the demo board.
Tektronix Demo 3 Board instructions
Tektronix Demo 3 Board Instruction Manual 3
Signal descriptions
Signal descriptions
2 ns pulse
Board label: 2NS_PULSE
Grid location: A8
Description: This signal is a 2 ns to 3 ns, 2.5 V pulse at a 3.3 ms
repetition rate. Use thi
capture specification of an instrument digital acquisition system.
2 ns pulse trigger
Board label: 2NS_TRIG
Grid location: A8
Description: This is the trigger edge signal for the 2 ns pulse. A falling
edge on this signal occurs approximately 5 n s before the 2 ns pulse.
s signal to demonstrate the minimum pulse width
350psdelayedc
Board label: CLK, 350_PS_DELAY_CLK
Grid location
Description: This is a 15 6 kHz square wave signal and a delayed copy.
Use the nomi
digital channels.
lock
: B1
nal 350 ps delay to demonstrate the timing resolution of
40 MHz square wave
Board label: 40_MHZ
Grid location: A8
Description: This is a 40 MHz square wave signal. This signal is not a
perfect square w ave shape and is intended to provide a fast repetitive
l to demonstrate high speed measurement capability.
signa
4 Tektronix Demo 3 Board Instruction Manual
AM modulation
Board label: AM_MOD
Grid location: A4
Description: This is a 1.25 MHz carrier amplitude signal modulated
by a 1.25 kHz sine wav e signal.
The AM Mod signal is centered around ground.
Set the oscilloscope trigger level to either the top or bottom of the
waveform to stabilize it on the display.
CAN bus
Board label: CAN_H, CAN_L
Grid location: A4, A5, A7
Description: These are the CAN (Contro ller Area Network) bus signals
between two CAN transceivers.
The bit rate of the data packet is 500 kbps.
Signal descriptions
Counter clock
Board label: CNT_CLK
Grid location: B3
Description: This is the 1.25 MHz clock signal for the 7-bit Counter
Output described next.
Counter output bits
Board label: CNT_OUT0: CNT_OUT6
Grid location: A3, B3
Description: These are the 7-bits of the binary counter. The LSB is
CNT_OUT0 at 625 KHz, that is, half of the counter input clock.
The Counter Output Bits and the Counter Clock signals are on eight
adjacent sets of header pins for easy connection to a digital probe.
Tektronix Demo 3 Board Instruction Manual 5
Signal descriptions
Crosstalk
Board label: XTALK1, XTALK2
Grid location: C8
Description: These two signals have significant crosstalk between
them. Use them to demonstrate high-speed digital acquisition.
DAC input, parallel
Board label: DAC_IN0: DAC_IN7
Grid location: H3, H4
Description: These are the 8-bit parallel output signals of the port
expander in the middle of the m ixed signal chain. The sine wave data
from the SPI bus is converted to 8 parallel bits to drive the DAC.
DAC_IN0 is the LSB. (See Figure 1.)
See the previous SPI Bus description for packet details.
DAC output
Board label: DAC_OUT
Grid location: H3
Description: This is the output of the DAC at the end of the mixed
signal chain. The DAC is driven from the port expander. The DAC
output is a sine wave. Since the output is not filtered, the digitizing
levels are present in the output waveform . (See Figure 1.)
6 Tektronix Demo 3 Board Instruction Manual
The resulting DAC voltage is a sine wave with an amplitude 0 to 3
volts, and a period of 31 ms.
Figure 1: Mixed signal chain block diagram
Ethernet bus
Board label: 10BaseT+, 10BaseT-, 100BaseT+, 100BaseT-
Grid location: C3, D3
Description: Eth ernet Serial Bus signals, driven as differential pairs:
The 10Base-T signal pair communicates at 10 Mbit/s.
Signal descriptions
The 100Base-TX signal pair communicates at 100 Mbit/s.
Fast edge
Board label: FAST_EDGE
Grid location: A3
Description: This is a 156 kH z capacitively coupled pulse signal with
a 1.5 ns rise and fall time.
Fast FF clock
Board label: FAS T_FF_CLK
Grid location: C1
Description: This is the 1.25 MHz clock input signal to a fairly fast
flip-flop. The pulse width of this clock si gnal varies slowly.
Tektronix Demo 3 Board Instruction Manual 7
Signal descriptions
Fast FF data
Board label: FAST_FF_ D
Grid location: C1
Description: This is the 1.25 MHz data input signal to a fairly fast
flip-flop that is asynch ro nou s to the clock input.
Fast FF Q output
Board label: FAST_FF_ Q
Grid location: C1
Description: This is the Q output signal of the fairly fast flip-flop. This
signal shows m etastable behavior infrequently.
FlexRay
Board label: FLEXRAY_BP, FLEXRAY_BM, FLEXRAY_TX/RX
Grid location: F4
Description: These FlexRay signals consist of the following test points:
FlexRay_BP, the positive half of a differential FlexRay bus
FlexRay_BM, the negative half of a differential F lexRay bus
FlexRay_Tx/Rx, the single-ended logic signal between the
controller and the transceiver
Thedatarateisat10Mb/s.Theswingis0to3.3V.Tri-stateisat1.65V
(BP and BM only). There are 15 individual 198-bit long frames.
Frequent anomaly
Board label: FREQ_ANOM
Grid location: B8, C8
Description: There are two frequently occurring anomalies in this
pulse train.
8 Tektronix Demo 3 Board Instruction Manual
I2Cbus
Signal descriptions
A half h eight runt signal occurs approximately e very 3.28 ms. Use a
Runt trigger to isolate the signal.
A 25 ns (narrow) pulse appears approximately every 3.28 ms. Use a
Pulse Width or Glitch trigger to isolate the signal.
The pulse train is a repeating group of three pulses. The three pulses
are 100 ns, 200 ns, and 100 n s wide, with a 100 ns low between. The
group repeats at a 1.6 μs rate.
The anom aly is a group of four pulses. The four pulses are 100 ns, 50 ns
(narrow), 100 ns (runt), and 100 ns wide, with a 100 ns low between,
except for a 50 ns low before the runt.
Board label: I2C_CLK, I2C_DATA
Grid location: H1, H2
2
Description: These are the I
between the μCandaserialEEPROM.
There are several different types of d ata packets.
C (Inter-IC Communication) bus signals
The clock rate is a 200 kHz, 0 to 5 volt signal.
I2S (Inter-IC Sound) bus
Board label: I2S_SCK, I2S_WS, I2S_SD
Grid location: H1, H2
cription: This is an I
Des
The clock rate is 2.5 MHz.
2
S (Inter-IC sound) serial bus.
LIN bus
Board label: LIN
Grid location: A7, A8, B8
Description: This is the LIN (Local Interconnect Network) bus signal
between two LIN transceivers.
Tektronix Demo 3 Board Instruction Manual 9
Signal descriptions
The bus speed is 19.2 kbaud. It contains a mix of version 1.x and 2.x
frames.
MIL-STD-1553
Board label: MIL1553+, MIL1553-
Grid location: C3
Description: A dual, redundant, differential-pair, protocol-bus
controller controlling multiple Remote Terminals. Messages consist of
one or more 16-bit words, w here each word is preceded by a 3 μs sync
pulse and followed by an odd parity bit.
Random burst
Board label: RNDM_BURST
Grid location: C8
Description: This is the signal that produces Bursts of 100 ns wide
logic pulses every 6.6 ms. The pattern is a pseudorandom bit sequence
that repeats every 128 bursts and has a 6.32 μsduration.
Rare anomaly
Board label: RARE_ANOM
Grid location: C8
Description: There a re two less-frequent anomalies in this pulse train
that can show up on high waveform capture rate oscilloscop es.
A half-height runt signal occurs approximately every 838.8 ms. Use a
Runt trigger to isolate the signal.
A 25 ns (narrow) pulse appears in appro ximately 838.8 ms. Use a Pulse
Width trigger to isolate the signal.
The pulse train is a repeating group of three pulses. The three pulses are
100 n s, 200 ns, and 100 ns wide, with a 100 ns low between each pulse.
The group repeats at a 1.6 μs rate.
10 Tektronix Demo 3 Board Instruction M an ual
The anomaly is a group of four pulses. The four pulses are 50 ns, 25 ns
(narrow), 100 ns (runt), and 100 ns w ide, with a 100 ns low between
each pulse, except for a 25 ns low before the narrow pulse.
Reset button
Board label: RESET
Grid location: B7
Description: Push the RESET button to star t RS-232 signals from a
common start point and to reset other functionality should the board
become corrupted due to static electricity or some other cause.
RS232 UART, transmit
Board label: UART, RS232_TX
Grid location: A6, A7
Description: The UART signal is the noninverted logic level input to
the RS-232 UART from the μC. The inverted transmit signal (TX) is the
RS-232 voltage level serial bus signal.
Signal descriptions
The decoded data packets display the ASCII string Tektronix, Enabling
Innovation.
There are no matching receive or data flow control signals.
The baud rate is 9600. The data format is 1 start bit, and 8 data bits
with no parity.
Single shot button
Board label: SINGLE SHOT
Grid location: B7
Description: Push the SING LE SHOT button to initiate a 200 ns pulse
on the SS_ PULSE signal connector (at grid location D8).
Tektronix Demo 3 Board Instruction Manual 11
Signal descriptions
Single shot pulse
Board label: SS_PULSE
Grid location: D8
Description: This is a 200 ns wide positive pulse that is initiated by the
SINGLE SHOT push button (grid location B7). The Demo 3 board
provides one pulse per button push.
Slow FF clock
Board label: SLOW_FF_CLK
Grid location: C1
Description: This is the 1.25 MHz clock input signal to a slow flip-flop.
Slow FF data
Board label: SLOW_FF_D
Grid location: C1
Description: This is the 1.25 MHz data input signal to a slow flip- flop
that is asynchronous to the clock input.
Slow FF Q output
Board label: SLOW_FF_Q
Grid location: C1
Description: This is the Q output signal of the slo w flip-flop. This
signal shows metastable behavior frequently.
12 Tektronix Demo 3 Board Instruction M an ual
SPI bus
Signal descriptions
Board label: SPI_SCLK, SPI_SS, SPI_MOSI
Grid location: G1, H1, H2, D1
Description: These are the SPI (Serial Peripheral Interface) serial bus
signals. (See Figure 1.)
The SPI bus works as follows:
SCLK rising edge clock
Active Low SS
Active High MOSI data
This is the beginning of the mixed signal chain. See the descriptions of
these signals: DAC Input, Parallel and DAC Output.
Packets occur approximately every 500 μs. The SPI packet contents are
transferred to the Parallel DAC Input bus at the end of the packet. The
Parallel DAC Input bus then changes the voltage output of the DAC.
The resulting DAC output is a sine wave with an amplitude 0 to 3 volts,
and a period of 31 ms.
The clock rate is a 200 kHz, 0 to 5 volt signal.
Spread spectrum clock
Board label: SS_CLOCK
Grid location: H4
Description: Nominally 98.5 MHz spread spectrum clock with
triangular modulation for demonstrating timing measurement trend s
over time.
Tektronix Demo 3 Board Instruction Manual 13
Signal descriptions
Step Edge X, Step Edge Y
Board label: STEP_EDGE_X, STEP_EDGE_Y
Grid location: C3
Description: These two identical step edge (rising edge) signals, when
used together, let you demonstrate different probe loading effects.
Connect two different probes simultaneously, with one on Step Edge
X and the other on Step Edge Y, and compare the rise times from each
probe for these identical signals.
For example, if you put a low input capacitance probe, like the
Tektronix TPP1000, on one o f these signals and an alternative, higher
input capacitance probe, like the Tektronix P6139A, on the other
signal, capture the waveforms on an oscilloscope and then overlay the
two captured signals, the waveform from the lower input capacitance
TPP1000 will show a faster rise time.
USB bus
Board label: USB_LS, USB_FS, USB_HS
Grid location: G5, H5, H6
Description: Universal Serial Bus signals, definedbyUSB2.0,and
driven as differential pairs:
USB_LS signal, the Low Speed USB standard, transmitting d ata
at 1.5 Mbit/s.
USB_FS signal, the Full Speed USB stand ard, transmitting data at
12 Mbit/s.
USB_HS signal, the High Speed USB standard, transmitting data
at 480 Mbits/s.
14 Tektronix Demo 3 Board Instruction M an ual
Loading...