SMA428A
High Gain, Low Noise Amplifier
PRELIMINARY DATA
•
HIGH GAIN Gp = 21 dB at 1.85 GHz
•
LOW NOISE FIGURE NF = 1.3 dB at 1.85 GHz
•
LOW CURRENT CONSUMPTION 5.9 mA
•
OPEN COLLECTOR OUTPUT
•
TYPICAL SUPPLY VOLTAGE: 2.4-3 V
•
GAIN-STEP-MODE (36dB)
•
ULTRA MINIATURE SOT323-6L PACKAGE (LEAD
FREE)
APPLICATIONS
•
LNA FOR CELLULAR MARKET (ideal for GSM900,
DCS1800 and PCS1900).
•
LNA FOR GPS APPLICATIONS
DESCRIPTION
High gain and low noise figures make the SMA428A an
ideal solution for Low Noise Amplifiers and receiver
front end stages up to 2.5 GHz. SMA428A’s typical
supply voltage range is 2.4 to 3.3 volts. It shows
excellent performances in terms of NF, Gain and
current consumption, using just 3 external matching
components. Applying supply voltage to the GS pin and
grounding Vcc pin, it provides a reduced gain step of 35
dB. SMA428A is housed in ultra miniature SOT323-6L
package(LEAD FREE), the relative dimensions are
1.15mmx1.8mm with 0.8mm thickness.
ABSOLUTE MAXIMUM RATINGS
Symbol
V
cc
V
out
V
GS
I
tot
I
in
P
tot
P
IN
T
op
T
stg
T
j
Device voltage
Voltage at pin Out
Voltage at pin GS
Total Device Current
Current into pin In
Total dissipation, T
s
<
125
o
C
Input Power
Operating temperature
Storage temperature
Max. operating junction temperature
Parameter
Value
4
4
3.5
12
0.5
60
8
-40 to +85
-65 to +150
150
Unit
V
V
V
mA
mA
mW
dBm
o
C
o
C
o
C
SOT323-6L (SC70)
ORDER CODE
SMA428ATR
BRANDING
TBD
BLOCK DIAGRAM
Vcc, 1
GS, 4
In, 6
Out, 3
GND, 2;5
THERMAL RESISTANCE
R
thjs
March, 10 2003
Thermal Resistance Junction soldering point
200
o
C/W
1/8
SMA428A
ELECTRICAL CHARACTERISTICS
(Ta = +25
o
C, V
CC
= 2.7V, tested in circuit shown in fig.1, unless otherwise specified)
Symbol
f
I
tot
Gp
NF
P
-1dB
IIP3
L
GS
I
CTR
Parameters
Frequency Range
Total device current
Power Gain
Noise Figure (Zs = 50
Ω
)
Input Power at 1 dB Gain Compression
Input third order intercept point
Insertion Loss in Gain-Step-Mode
Current consumption in Gain-Step-Mode
Vcc = 0.0 V, V
CTRL
= 2.7 V,
R
CTRL
= 3 k
Ω
Vcc = 0.0 V, V
CTRL
= 2.7 V,
R
CTRL
= 3 k
Ω
-23
-13
11
0.33
18
18
Test Conditions
Min
Typ
1850
5.9
21
1.3
1.7
7.5
Max
Unit
MHz
mA
dB
dB
dBm
dBm
dB
mA
PIN CONNECTION
(Top View)
1
2
3
6
5
4
(Bottom View)
6
5
4
1
2
3
Pin No.
1
2
3
4
5
6
Pin Name
VCC
GND
OUTPUT
GS
GND
INPUT
3/8
SMA428A
S-Parameters
( Z
L =
Z
S
= 50
Ω,
V
CC
= 2.7V, measured in application circuit shown in fig.2)
24
0
-1
23
T c = -40 °C
T c = 25 °C
-2
-3
22
T c = 25 °C
T c = 85 °C
-4
IRL (dB)
T c = 8 5 °C
20
Gp (dB)
21
-5
-6
-7
-8
T c = -40 °C
19
-9
18
18 00 1 81 0 1 82 0 1 83 0 1 84 0 1 85 0 1 86 0 1 87 0 1 88 0 18 90 19 00
f (MHz )
-10
1 800 1810 1 820 183 0 1 840 1850 1 860 187 0 1 880 189 0 1 900
f (MHz )
-20
-22
-24
-26
-28
ISL (dB)
-30
-32
-34
-36
-38
-40
180 0 18 10 1820 18 30 1840 185 0 1 860 1870 18 80 1890 190 0
f ((MHz )
T c = 25 °C
T c = -40 °C
10
5
0
-5
-10
ORL (dB)
-15
-20
T c = 85 °C
T c = -40 °C
T c = 85 °C
Tc = 25 °C
-25
-30
-35
-40
1 800 181 0 18 20 1 830 184 0 18 50 18 60 1 87 0 188 0 18 90 1 900
f (MHz )
4/8
SMA428A
TYPICAL PERFORMANCE
Supply Current Vs Temperature
0
Control Current Vs Temperature
0.5
0.45
-5
0.4
0.35
0.3
-1 0
Ictrl (mA)
Gp (dB)
T c = 25 °C
-1 5
T c = 85 °C
-2 0
0.25
0.2
0.15
T c = -40 °C
-2 5
0.1
0.05
-3 0
18 00 18 10 18 20 183 0 1 84 0 1 85 0 1 86 0 18 70 18 80 18 90 190 0
f (MHz )
0
-4 0
-25
25
T (°C )
50
85
OFF-Gain
(Vcc = 0V, Vctrl = 2.7V, Rctrl = 3Kohm)
-1 0
-1 2
-1 4
T c = 25 °C
-1 6
-1 8
Gp (dB)
T c = 85 °C
-2 0
-2 2
T c = -40 °C
-2 4
-2 6
-2 8
-3 0
18 00 18 10 18 20 183 0 1 84 0 1 85 0 1 86 0 18 70 18 80 18 90 190 0
f (MHz )
5/8
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