tb440

EL5308 - Demo Board
®
Technical Brief
Using EL5308 Demo Board
TB440
Supply Operation
General Description
The EL5308 fixed gain Amp demo
board simplifies the evaluation of the
EL5308, a 450MHz bandwidth high-speed amplifier. Its
circuit configuration sets the gain of 2 on the demo board.
For detail application, please refer to the EL5308 data sheet.
Features
The EL5308 possess single and dual supply operation, from
5V to 10V. Each channel has a disable function. Upon
being disabled, the outputs are tri-stated and the power
supply current reduces to less than 9µA per amplifer.
Allowing Enable Pin to float, or applying a low logic level will
enable the amplifier.
Layout Considerations
The PC board layout has been optimized for high-speed
signals. Careful attention was given to the signal paths,
power supply bypassing, and grounding. All the input and
output signal paths are 50Ω MicroStrip line. The output
resistor ROUT is placed very close to the output pin to
minimize the output stray capacitance. Small surface mount
ceramic capacitors are placed as close as possible to the
supply pins.
• 350MHz Bandwidth for gain of +1, -1, and +2.
• Optional Selectable Gain (+1, -1, +2)
• Fully assemble and tested
Detailed Description
Voltage - Gain Adjustment
The EL5308's gain can be selected by changing the values
of Jumpers on the demo board. (See table)
Resistor Values for Various Gains
GAIN
(dB)
R1 (Ω)
R2 (Ω)
R3 (Ω)
R4 (Ω)
BANDWIDTH
(MHz)
+1
0
open
open
open
440
-1
open
0
0
open
440
+2
0
open
open
0
450
1
March 15, 2004
Evaluation Set Up
1. Use a ±5V supply. Connect the +5V to VS+ pin and the
-5V to VS- pin. Connect power supply ground to the GND
pin.
2. Supply a signal of ± 1V at 1MHz to the INPUT SMA
connector.
3. Connect the OUTPUT SMA connector to an oscilloscope
through a 50Ω cable.
4. Turn on the power supply and verify the output signal of
1V on the oscilloscope.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright © Intersil Americas Inc. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
Technical Brief 440
EL5308 Schematic
RA3
Open
RA4
0
RA1
0
INA
1
RA2
Open
RAIN
49.9
16
+
2
RAOUT
49.9
15
-
OUTA
ENA
VS-
3
ENB
VS+
4
RB1
0
INB
RBIN
49.9
ENC
6
RCIN
49.9
RBOUT
49.9
OUTB
12
NC
7
RC1
0
VS+
13
-
5
RB2
Open
INC
VS+ 14
NC 11
+
10
-
8
RC2
Open
RCOUT
49.9
OUTC
9
EL5308
RC3
Open
RC4
0
RB3
Open
RB4
0
VS+
VS+
C1
4.7µF
CBP
C2
4.7µF
CBP
0.1µF
GND
GND
VS-
2
0.1µF
VS-
Technical Brief 440
Bill of Materials for EL5308
DESIGNATION
QTY
MANUFACTURE
MFG. PART NUMBER
DUT
1
EL5308
Intersil
EL5308
PCB
1
Printed Circuit Board, SOIC 16
DDI
EL5396/7 Fixed Gain Amp
C1, C2
2
4.7µF, 10% Tantalum Capacitors
VISHAY
293D475X9016B2T
CBP
2
0.1µF, 20% Ceramic Capacitors
PHILIPS
08052E104M9BB0
RINA, RINB, RINC, REA,
REB, REC, RAOUT, RBOUT,
RCOUT
9
49.9Ω, 1% Ceramic Resistors
RΩ
MCR10F49R9
RA1, RB1, RC1
3
0Ω, 1% (install only for Av = +1, +2)
RΩ
MCR10F00R0
RA3, RB3, RC3
3
0Ω, 1% (install only for Av = +1)
RΩ
MCR10F00R0
RA4, RB4, RC4
3
0Ω, 1% (install only for Av = +2)
RΩ
MCR10F00R0
RA2, RB2, RC2, RA3, RB3,
RC3
6
0Ω, 1% (install only for Av = -1)
RΩ
MCR10F00R0
GND, VS+, VS-
3
Banana Jacks
SPC TECHNOLOGY
39N867
VINA, VINB, VINC, ENA,
ENB, ENC, OUTA, OUTB,
OUTC
9
SMA 50Ω Straight Jack Connector
JOHNSON COMPONENTS
98F1467
4
# 6 Internal Tooth Lock Washer
OLANDER
6NILWS
4
6-32x.375”Lg., Philips Pan Head
OLANDER
6C37PPMS
4
6-32x.50”Lg., Hex Standoff, 1/4” Hex Dia
OLANDER
6C50HF4U
3
DESCRIPTION
Technical Brief 440
Demo Board Layout
Top Layer
Bottom Layer
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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.
For information regarding Intersil Corporation and its products, see www.intersil.com
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