Rainbow Electronics MAX2374 - Manual (Page 4)

MAX2374
SiGe, Variable IIP3, Low-Noise Amplifier
in UCSP Package
4 _______________________________________________________________________________________
1.0
2.0
1.5
3.0
2.5
4.0
3.5
4.5
750 850 800 900 950 1000
NOISE FIGURE vs. FREQUENCY
MAX2374-07
FREQUENCY (MHz)
NOISE FIGURE (dB)
V CC = 2.75V
GAIN = V CC
20
15
10
5
0
2.5 4.0 3.0 3.5 4.5 5.0 5.5
CURRENT vs. VOLTAGE AND R BIAS
MAX2374-08
V CC (V)
R BIAS = 20k Ω, GAIN = V
CC
R BIAS = 20k Ω, GAIN = GND
R BIAS = 10k Ω, GAIN = V
CC
R BIAS = 10k Ω, GAIN = GND
R BIAS = 43k Ω, GAIN = GND
R BIAS = 43k Ω, GAIN = V
CC
I CC
(mA)
Typical Operating Characteristics (continued)
(Typical Application Circuit, V CC = +2.7V to +5.5V, P LNAIN = -30dBm, f LNAIN = 881MHz, R BIAS = 20k Ω, T
A = +25°C, unless other-
wise noted.)
LNA Output Port. This port requires an external pullup inductor, which may be used as part of the matching
network.
LNAOUT B2
Supply Voltage Input. Bypass with a 100pF capacitor to GND. V CC B3
LNA Bias Setting Pin. For nominal bias, connect 20k Ω resistor to V
CC . Adjust the resistor value to alter the
linearity of the LNA.
BIAS B1
Gain-Control Logic Input. Drive high for high-gain mode. Drive low for low-gain mode. GAIN A1
PIN
LNA Input Port. Blocking capacitor is required, which may be used as part of the matching network. LNAIN A2
Ground GND A3
FUNCTION NAME
20
0
5 25 15 35 45
GAIN vs. R BIAS AND TEMPERATURE
MAX2374-05
R BIAS (k Ω)
GAIN (dB)
15
10
5
T A = +85°C
T A = -40°C
T A = -40°C
T A = +25°C T
A
= +85°C
T
A
= +25°C
GAIN = V CC
GAIN = GND
V CC = 2.75V
0 20 40 60
IIP3 vs. R BIAS AND TEMPERATURE
MAX2374-06
R BIAS (k Ω)
IIP3 (dBm)
0
5
15
10
20
V CC = 2.75V,
f = 881MHz, 882MHz
= V GAIN = GND A
= V GAIN = V CC B
T A = +25 °C
T A = +85 °C
T A = -40 °C
T A = +85 °C
A
B
B
T A = +25 °C
T
A
= -40 °C
Pin Description