Philips Semiconductors
Product specification
SA5205A
Wide-band high-frequency amplifier
2
1997 Nov 07
853-1598 18662
DESCRIPTION
The SA5205A family of wideband amplifiers replace the SA5205
family. The ‘A’ parts are fabricated on a rugged 2
µ
m bipolar process
featuring excellent statistical process control. Electrical
performance is nominally identical to the original parts.
The SA5205A is a high-frequency amplifier with a fixed insertion
gain of 20dB. The SA5205A operates with a single supply of 6V, and
only draws 24mA of supply current, which is much less than
comparable hybrid parts. The noise figure is 4.8dB in a 75
Ω
system
and 6dB in a 50
Ω
system.
Until now, most RF or high-frequency designers had to settle for
discrete or hybrid solutions to their amplification problems. Most of
these solutions required trade-offs that the designer had to accept in
order to use high-frequency gain stages. These include high-power
consumption, large component count, transformers, large packages
with heat sinks, and high part cost. The SA5205A solves these
problems by incorporating a wide-band amplifier on a single
monolithic chip.
The part is well matched to 50 or 75
Ω
input and output impedances.
The Standing Wave Ratios in 50 and 75
Ω
systems do not exceed
1.5 on either the input or output from DC to the -3dB bandwidth limit.
Since the part is a small monolithic IC die, problems such as stray
capacitance are minimized. The die size is small enough to fit into a
very cost-effective 8-pin small-outline (SO) package to further
reduce parasitic effects.
No external components are needed other than AC coupling
capacitors because the SA5205A is internally compensated and
matched to 50 and 75
Ω
. The amplifier has very good distortion
specifications, with second and third-order intermodulation
intercepts of +24dBm and +17dBm respectively at 100MHz.
The device is ideally suited for 75
Ω
cable television applications
such as decoder boxes, satellite receiver/decoders, and front-end
amplifiers for TV receivers. It is also useful for amplified splitters and
antenna amplifiers.
The part is matched well for 50
Ω
test equipment such as signal
generators, oscilloscopes, frequency counters and all kinds of signal
analyzers. Other applications at 50
Ω
include mobile radio, CB radio
and data/video transmission in fiber optics, as well as broad-band
LANs and telecom systems. A gain greater than 20dB can be
achieved by cascading additional SA5205As in series as required,
without any degradation in amplifier stability.
PIN CONFIGURATIONS
8
7
6
5
4
3
2
1
VCC
VIN
GND
GND
VCC
VOUT
GND
GND
D Packages
TOP VIEW
20dB
SR00215
Figure 1. Pin Configuration
FEATURES
•
600MHz bandwidth
•
20dB insertion gain
•
4.8dB (6dB) noise figure ZO=75
Ω
(ZO=50
Ω
)
•
No external components required
•
Input and output impedances matched to 50/75
Ω
systems
•
2000V ESD protection
APPLICATIONS
•
75
Ω
cable TV decoder boxes
•
Antenna amplifiers
•
Amplified splitters
•
Signal generators
•
Frequency counters
•
Oscilloscopes
•
Signal analyzers
•
Broad-band LANs
•
Fiber-optics
•
Modems
•
Mobile radio
•
Security systems
•
Telecommunications
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
ORDER CODE
DWG #
8-Pin Plastic Small Outline (SO) package
-40 to +85
°
C
SA5205AD
SOT96-1
