ETC DEM-OPA628

®
DEM-OPA628
EVALUATION FIXTURES
FEATURES
● SOIC AND DIP VERSIONS
● SURFACE MOUNT COMPONENTS
FOR OPTIMUM PERFORMANCE
● QUICK AND EASY PERFORMANCE
TESTING
● RF TWO-LAYER BOARD
● OPTIMIZED BOARD LAYOUT
DESCRIPTION
The DEM-OPA628 evaluation fixtures are
preassembled printed circuit boards designed for a
quick and easy evaluation of the OPA628 in a variety
of gain configurations. Burr-Brown offers one board
for the SOIC version of the OPA628 (AU model) and
a second one for the DIP package (AP model).
ceramic chip capacitors for local bypassing of all four
supply leads, are used to maintain the low harmonic
distortion the OPA628. The demonstration boards are
designed for use of surface-mount resistors to keep the
parasitic capacitance as low as possible by showing a
layout for multiple circuit configuration.
The use of the demoboards is recommended to evaluate the performance of the OPA628. The optimized
and flexible layout provides the user with a selection
of various non-inverting and inverting gain configurations. A combination of dipped tantalum capacitors to
bypass the power supplies at the board level, and
The fixture requires a bipolar ±5V power supply.
Separate power supply paths are used for the inputstage and the output-stage supply. This approach minimizes the coupling of non-linear output stage currents
into the input gain stages.
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (602) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
 1993 Burr-Brown Corporation
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Telex: 066-6491 • FAX: (602) 889-1510 • Immediate Product Info: (800) 548-6132
LI-452
Printed in U.S.A. December, 1993
ORDERING INFORMATION
PART NUMBER
PACKAGE
DEM-OPA628AP-C
DEM-OPA628AU-C
Plastic DIP
SOIC
GAIN
V/V
+1
+1
+1
+2
+2
+5
–1
–2
–5
Table I shows the resistor values for various gain configurations. These resistors are included in the demoboard. To
terminate the input of the board when using the inverting
configuration a 50Ω/75Ω BNC through-terminator may be
used or an additional resistor, R T, can be mounted on the
board.
R1
Ω
R2
Ω
R3
Ω
R4
Ω
R5
Ω
R6
Ω
R7
Ω
Open
Open
Open
261.0
261.0
75.0
Open
Open
Open
49.9
49.9
49.9
261.0
261.0
301.0
301.0
301.0
301.0
Open
Open
Open
Open
Open
Open
301.0
150.0
60.4
49.9
49.9
75.0
49.9
75.0
49.9
150.0
100.0
49.9
Short
Short
Short
Short
Short
Short
Open
Open
Open
Open
100.0
Open
Open
Open
Open
49.9
49.9
75.0
49.9
75.0
49.9
49.9
49.9
49.9
(1)
(1)
(1)
NOTE: (1) Set R6 value for desired amplifier load demonstration.
TABLE I. Recommended Resistor Values for Selected Gain
Settings.
COMPONENT LIST
REFERENCE
QUANTITY
PART NUMBER
DESCRIPTION
MANUFACTURER
J1-2
2
—
BNC Connector
Kings
P1-2
2
ED500/2DS
2-Pin Power Block
On-Shore Technology
C5-8
4
—
2.2µF, 25V Tantalum Capacitor
Kemet
C1-4
4
C1206C104M5UAL
0.1µF, 25V Ceramic Chip Capacitor
Kemet
1
CRCW12060002T
0Ω, 1206 Chip Resistor, 1% MF
Dale
3
CRCW120649R9FT
49.9Ω, 1206 Chip Resistor, 1% MF
Dale
1
CRCW120660R4FT
60.4Ω, 1206 Chip Resistor, 1% MF
Dale
2
CRCW120675R0FT
75.0Ω, 1206 Chip Resistor, 1% MF
Dale
1
CRCW12061000FT
100Ω, 1206 Chip Resistor, 1% MF
Dale
2
CRCW12061500FT
150Ω, 1206 Chip Resistor, 1% MF
Dale
2
CRCW12062610FT
261Ω, 1206 Chip Resistor, 1% MF
Dale
2
CRCW1206301FT
301Ω, 1206 Chip Resistor, 1% MF
Dale
2
CRCW1206499R9FT
499.9Ω, 1206 Chip Resistor, 1% MF
Dale
8
2-330808-8
Single IC Pins
AMP
4
—
4-40, 1/4" Hex Stand-Offs
—
4
—
4-40, 1/4" Screws Philips
—
1
—
Printed Circuit Board
Burr-Brown
R2
C5
2.2µF
C6
2.2µF
P1
+5V
R1
C1
0.1µF
R3
2
Input
GND
8
R7
7
6
R5
3
J1
RT(1)
C2
0.1µF
R4
J2
5
4
IC1
OPA628
Output
R6
P2
–5v
C3
0.1µF
C7
2.2µF
C4
0.1µF
NOTE: (1) See text for details.
FIGURE 1. Circuit Diagram.
®
DEM-OPA628
2
GND
C8
2.2µF
Top Side
Bottom Side
FIGURE 2. DEM-OPA628AP-C DIP Version.
Top Side
Bottom Side
FIGURE 3. DEM-OPA628AU-C SOIC Version.
®
3
DEM-OPA628