EL5421 Intersil Corporation, EL5421 Datasheet - Page 11

• Manufacturer Part Number: EL5421
• Description: Buffer, Quad 12MHz, Rail-to-rail Input-Output, 4.5 to 16.5V, SR=10v/uS
• Manufacturer: Intersil Corporation

Unused Buffers
It is recommended that any unused buffer have the input tied
to the ground plane.
Driving Capacitive Loads
The EL5421 can drive a wide range of capacitive loads. As
load capacitance increases, however, the -3dB bandwidth of
the device will decrease and the peaking increase. The
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.
FIGURE 4. PACKAGE POWER DISSIPATION VS AMBIENT
600
500
400
300
200
100
0
0
MSOP10 Package Mounted on JEDEC JESD51-3 Low
Effective Thermal Conductivity Test Board
485mW
TEMPERATURE
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
25
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Ambient Temperature (°C)
For information regarding Intersil Corporation and its products, see www.intersil.com
50
11
75 85
100
MAX T
J
=125°C
125
150
EL5421
buffers drive 10pF loads in parallel with 10kΩ with just 1.5dB
of peaking, and 100pF with 6.4dB of peaking. If less peaking
is desired in these applications, a small series resistor
(usually between 5Ω and 50Ω) can be placed in series with
the output. However, this will obviously reduce the gain
slightly. Another method of reducing peaking is to add a
"snubber" circuit at the output. A snubber is a shunt load
consisting of a resistor in series with a capacitor. Values of
150Ω and 10nF are typical. The advantage of a snubber is
that it does not draw any DC load current or reduce the gain
Power Supply Bypassing and Printed Circuit
Board Layout
The EL5421 can provide gain at high frequency. As with any
high-frequency device, good printed circuit board layout is
necessary for optimum performance. Ground plane
construction is highly recommended, lead lengths should be
as short as possible and the power supply pins must be well
bypassed to reduce the risk of oscillation. For normal single
supply operation, where the V
a 0.1µF ceramic capacitor should be placed from V
to V
connected in parallel, placed in the region of the buffer. One
4.7µF capacitor may be used for multiple devices. This same
capacitor combination should be placed at each supply pin
to ground if split supplies are to be used.
S
- pin. A 4.7µF tantalum capacitor should then be
S
- pin is connected to ground,
S
+ to pin