Datasheet

DESIGN-IN TOOLS
DEMONSTRATION BOARDS
OPERATING SUGGESTIONS
MACROMODELS AND APPLICATIONS
VCA824
www.ti.com ....................................................................................................................................... SBOS394C – NOVEMBER 2007 – REVISED DECEMBER 2008
predict typical small-signal ac performance, transient
steps, dc performance, and noise under a wide
variety of operating conditions. The models include
the noise terms found in the electrical specifications
of the relevant product data sheet.
Two printed circuit boards (PCBs) are available to
assist in the initial evaluation of circuit performance
using the VCA824 in its two package options. Both of
these are offered free of charge as unpopulated
Operating the VCA824 optimally for a specific
PCBs, delivered with a user's guide. The summary
application requires trade-offs between bandwidth,
information for these fixtures is shown in Table 1 .
input dynamic range and the maximum input voltage,
the maximum gain of operation and gain, output
Table 1. EVM Ordering Information
dynamic range and the maximum input voltage, the
LITERATURE
package used, loading, and layout and bypass
BOARD PART REQUEST
recommendations. The Typical Characteristics have
PRODUCT PACKAGE NUMBER NUMBER
been defined to cover as much ground as possible to
VCA824ID SO-14 DEM-VCA-SO-1B SBOU050
describe the VCA824 operation. There are four
VCA824IDGS MSOP-10 DEM-VCA-MSOP-1A SBOU051
sections in the Typical Characteristics:
• V
S
= ± 5V DC Parameters and V
S
= ± 5V DC and
The demonstration fixtures can be requested at the
Power-Supply Parameters , which include dc
Texas Instruments web site (www.ti.com ) through the
operation and the intrinsic limitation of a VCA824
VCA824 product folder.
design
• V
S
= ± 5V, A
VMAX
= +2V/V Gain of +2V/V
Operation
SUPPORT
• V
S
= ± 5V, A
VMAX
= +10V/V Gain of +10V/V
Computer simulation of circuit performance using
Operation
SPICE is often useful when analyzing the
• V
S
= ± 5V, A
VMAX
= +40V/V Gain of +40V/V
performance of analog circuits and systems. This
Operation
principle is particularly true for video and RF amplifier
circuits where parasitic capacitance and inductance
Where the Typical Characteristics describe the actual
can play a major role in circuit performance. A SPICE
performance that can be achieved by using the
model for the VCA824 is available through the TI web
amplifier properly, the following sections describe in
page. The applications group is also available for
detail the trade-offs needed to achieve this level of
design assistance. The models available from TI
performance.
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Product Folder Link(s): VCA824