Philips Semiconductors
Product specification
Wide-band high-frequency amplifier
SA5205A
DESCRIPTION
The SA5205A family of wideband amplifiers replace the SA5205
family. The ‘A’ parts are fabricated on a rugged 2µm 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 75Ω system
and 6dB in a 50Ω 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 75Ω input and output impedances.
The Standing Wave Ratios in 50 and 75Ω 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 75Ω. 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 75Ω 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 50Ω test equipment such as signal
generators, oscilloscopes, frequency counters and all kinds of signal
analyzers. Other applications at 50Ω 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
D Packages
V
CC
V
IN
GND
GND
1
20dB
2
3
4
TOP VIEW
7
6
5
8
V
CC
V
OUT
GND
GND
SR00215
Figure 1. Pin Configuration
FEATURES
•
600MHz bandwidth
•
20dB insertion gain
•
4.8dB (6dB) noise figure ZO=75Ω (ZO=50Ω)
•
No external components required
•
Input and output impedances matched to 50/75Ω systems
•
2000V ESD protection
APPLICATIONS
•
75Ω 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
8-Pin Plastic Small Outline (SO) package
TEMPERATURE RANGE
-40 to +85°C
ORDER CODE
SA5205AD
DWG #
SOT96-1
1997 Nov 07
2
853-1598 18662
Philips Semiconductors
Product specification
Wide-band high-frequency amplifier
SA5205A
SUPPLY CURRENT—mA
35
34
32
T
A
= 25
o
C
OUTPUT LEVEL—dBm
30
28
26
24
22
20
18
16
5
5.5
6
6.5
7
7.5
8
SUPPLY VOLTAGE—V
11
10
9
8
7
6
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
10
1
V
CC
= 7V
V
CC
= 6V
V
CC
= 5V
V
CC
= 8V
Z
O
= 50Ω
T
A
= 25
o
C
2
4
6
8
10
2
2
4
6
8
10
3
SR00218
SR00217
FREQUENCY—MHz
Figure 3. Supply Current vs Supply Voltage
9
Figure 7. Saturated Output Power vs Frequency
10
9
8
7
6
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
10
1
V
CC =
8V
V
CC =
6V
V
CC =
7V
NOISE FIGURE—dBm
8
v
cc
= 8v
v
cc
= 7v
v
cc
= 6v
v
cc
= 5v
OUTPUT LEVEL—dBm
Z
O
= 50Ω
T
A
= 25
o
C
7
V
CC =
5V
6
Z
O
= 50Ω
T
A
= 25
o
C
5
10
1
2
4
6
8
10
2
2
4
6
8
10
3
SR00219
2
4
6
8
10
2
2
4
6
8
10
3
SR00220
FREQUENCY—MHz
FREQUENCY—MHz
Figure 4. Noise Figure vs Frequency
25
v
cc
= 8v
INSERTION GAIN—dB
v
cc
= 7v
20
Figure 8. 1dB Gain Compression vs Frequency
SECOND–ORDER INTERCEPT—dBM
40
35
30
25
20
15
10
Z
O
= 50Ω
T
A
= 25
o
C
v
cc
= 6v
15
Z
O
= 50Ω
T
A
= 25
o
C
10
10
1
v
cc
= 5v
2
4
6
8
10
2
2
4
6
8
10
3
SR00221
4
5
FREQUENCY—MHz
6
7
8
POWER SUPPLY VOLTAGE—V
9
10
SR00222
Figure 5. Insertion Gain vs Frequency (S
21
)
25
T
A
= 55
o
C
T
A
= 25
o
C
20
Figure 9. Second-Order Output Intercept vs Supply Voltage
30
THIRD–ORDER INTERCEPT—dBm
INSERTION GAIN—dB
25
20
Z
O
= 50Ω
T
A
= 25
o
C
T
A
= 85
o
C
15
V
CC
= 8V
Z
O
= 50Ω
10
10
1
T
A
= 125
o
C
15
10
2
4
6
8
10
2
2
4
6
8
10
3
SR00223
5
4
5
FREQUENCY—MHz
6
7
8
9
POWER SUPPLY VOLTAGE—V
10
SR00224
Figure 6. Insertion Gain vs Frequency (S
21
)
Figure 10. Third-Order Intercept vs Supply Voltage
1997 Nov 07
5
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