an1189

ISL5x57EVAL1 and EVAL2 User’s Manual
®
Application Note
AN1189.0
Functional Block Diagram
The ISL5x57EVAL1 and EVAL2 evaluation boards provide a
quick and easy method for evaluating the ISL5757, ISL5857,
ISL5957 (10-, 12-, or 14-bit), 260MSPS high speed DACs.
EVAL1 is populated with an SOIC package and EVAL2 is
populated with a TSSOP package. The board is configured
so that the converter outputs differential current into a
transformer circuit to form an output voltage. The amount of
current out of the DAC is determined by an external resistor
and either an internal or external reference voltage. The
CMOS digital inputs have optional external termination
resistors. The evaluation board includes a ribbon cable
digital interface.
DVDD PLANE
DGND PLANE
AVDD PLANE
2x20 PIN HEADER
Description
April 7, 2005
IOUTA
SMA
10-14 BITS
XFMR
DAC
CLOCK
AGND PLANE
T1
IOUT
SMA
IOUTB
SMA
CLK
SMA
Features
• 260MSPS 10-, 12- or 14-Bit CMOS DAC
• Transformer-Coupled or Single-Ended SMA Outputs
Ordering Information
PART
NUMBER
Getting Started
TEMP.
RANGE
(°C)
PACKAGE
NUMBER
OF BITS
CLOCK
SPEED
ISL5757EVAL1
25
SOIC
10
260MHz
ISL5857EVAL1
25
SOIC
12
260MHz
ISL5957EVAL1
25
SOIC
14
260MHz
ISL5757EVAL2
25
TSSOP
10
260MHz
ISL5857EVAL2
25
TSSOP
12
260MHz
ISL5957EVAL2
25
TSSOP
14
260MHz
See Figure 1. A summary of the equipment, external
supplies and signal sources needed to operate the board is
given below:
1. +3.3V supply for ISL5x57 DAC.
2. Pattern generator (pattern source).
3. Square wave, DC-biased clock source (usually part of the
pattern generator).
4. Spectrum analyzer or oscilloscope for viewing the output
of the converter.
Attach the evaluation board to the power supply(s). Connect
the bits from the data generator to the evaluation board
using the 2x20 pin connector (J1). Connect the clock source
to the evaluation board, either through the 2x20 pin
connector (J1) or via the provided SMA (J2).
Using a coaxial cable with the proper SMA connector, attach
the output of the converter, IOUT (J11), to the measurement
equipment that will be evaluating the converter’s
performance. Make sure that the jumpers are in their proper
placement (default placement should be J5 and J10
populated, all others not populated).
Set the clock signal and data levels to swing from 0-3V. Turn
the power supply on. Turn the pattern and clock on and
measure the result at the analog output SMA (J11).
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1189
GORE QUIETZONE® CABLES
2x20 PIN HEADER
ISL5x57 EVALUATION BOARD
50Ω
SMA
CABLE
14 BITS
ISL5x57
CLOCK
DAC
SPECTRUM ANALYZER
PATTERN GENERATOR
+3.3V
POWER
SUPPLY
Quietzone® is a registered trademark of W.L. Gore & Associates, Inc.
FIGURE 1. INTERSIL ISL5x57 EVALUATION SYSTEM SETUP BLOCK DIAGRAM
Board Options
Digital Inputs
Jumpers (Default State)
The digital inputs are expecting 3V CMOS levels. The board
is shipped without termination resistors so that most systems
can drive the load. The board is configured so that the user
can populate 50Ω termination resistors if required (R1-15).
Consult the datasheet for the DAC for min/max amplitude
requirements for the clock and data.
J3 - Selects DAC Sleep Mode (OPEN)
J4 - Selects External Reference (OPEN)
J5 - Selects Internal Reference (SHORT)
J6 - Selects IOUTA (OPEN)
Analog Outputs
J7 - Selects IOUTB (OPEN)
J10 - Grounds the Transformer Output (SHORT)
Output Transformer
T1 - T1-1T (case style Mini-Circuits KK81)
T2 - ADT1-1WT (case style Mini-Circuits CD542)
Clock
The transformer configuration is such that it expects to see a
50Ω load at the end of an RF cable. If the user wishes to
evaluate the single-ended performance of the DAC, J6
and/or J7 will need to be populated, and R31/32 should be
populated with 50Ω resistors (or a resistor of choice that
does not cause the analog output to violate the output
voltage compliance range specified in the datasheet.)
2x20 Pin Header (J1 - pin 19)
Board Schematics/Layout/BOM
SMA - J2
The schematics, board plots, and bill of materials can be
downloaded from the Intersil web site. Search on the DAC
part number.
RSET
Fixed Resistor - R34 (2kΩ = 20mA full scale output)
Potentiometer - R35
Other
The labels on the board for IOUTB (J8) and IOUTA (J9) are
backwards. J8 should be IOUTA and J9 should be IOUTB.
Power Supply
Split AVDD and DVDD
Single VDD (by connecting them together prior to the
inductors on the board)
2
ISL5x57 + ISL5217 Combo
The ISL5x57 evaluation board is designed to interface
directly to an ISL5217 evaluation board. The ISL5217 is a
104MSPS Digital Up Converter. The ISL5217 can be used to
AN1189.0
April 7, 2005
Application Note 1189
generate 1-4 narrowband carriers or 1-2 wideband carriers.
Consult the ISL5217 documentation for detailed information
on using the ISL5217 evaluation board.
50Ω terminator. (Or, 50Ω terminators can be populated on
the evaluation boards. See the board schematics for more
information on doing this.)
To connect the two boards together, J4 on the ISL5217eval
(DUC) is connected to J1 on the ISL5x57eval (DAC) via a
2x20 pin ribbon cable. The DAC board is configured as is
stocked, except R16 is not populated. See Figure 2 for a
block diagram of the two boards connected.
If a generator with CLK and CLK is not available, a single
clock source can be used. Connect a T-connector to J2 of
the DAC board and another to J11 of the DUC board.
Connect a DC-biased clock signal to the connector at J2,
then connect J2 and J11 together with a short cable.
Connect a 50Ω terminator to the other side of the
T-connector at J11 on the DUC board. Sometimes the length
of the clock cable running from the DAC board to the DUC
board has to be adjusted to achieve adequate setup and
hold times between DATA and CLK.
If a clock source is available that has both CLK and CLK, the
clocking of the two boards is simplified. CLK should connect
to the DUC evaluation board at J11, with a T-connector that
has a 50Ω terminator attached. CLK should go to the DAC
evaluation board at J2 and also use a T-connector with a
CLOCK (104M MAX)
2x20 PIN HEADER
2x20 PIN HEADER
ISL5217
4CH DIGITAL
UP CONVERTER
CLOCK (104M MAX)
RIBBON CABLE
14 BITS
ISL5x57
DAC
50Ω
SMA
CABLE
TO SPECTRUM
ANALYZER
ISL5x57 EVALUATION BOARD
+3.3V (<0.1A)
+5V (<2A)
ISL5217 EVALUATION BOARD
POWER
SUPPLY
POWER
SUPPLY
FIGURE 2. INTERSIL ISL5x57 + ISL5217 SETUP BLOCK DIAGRAM
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Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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AN1189.0
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