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LNAs with Step Attenuator and VGA
Table 4. MAX2373 Typical Noise Parameters
(V CC = 2.775V, RX_EN = high, LNA_I = high, RF_ATTN = low, P IN = -30dBm, T A = +25°C, data from design simulation.)
FREQUENCY (MHz)
850
870
890
910
930
950
NF MIN (dB)
1.06
1.08
1.10
1.11
1.13
1.15
?Γ OPT ?
0.35
0.35
0.34
0.34
0.33
0.33
∠ Γ OPT
60.5
61.8
63.3
64.7
66.2
67.7
R N ( Ω )
10.02
9.98
9.94
9.90
9.86
9.82
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
EP
NAME
LNA_IN
LNA_E
RX_EN
RF_ATTN
AGC
LNA_I
LNA_OUT
LNA_V CC
AGC_BYP
RSET
RF_V CC
GND
Exposed
Pad
FUNCTION
RF Input. Requires DC-blocking capacitor and external matching network.
LNA Emitter. Connect to GND with an inductor. See inductor value in Table 5.
LNA Control. Set RX_EN high to enable LNA; set RX_EN low to disable LNA.
Attenuator Control. Set RF_ATTN high for low-gain mode; set RF_ATTN low for high-gain mode.
AGC Input Voltage. Set AGC to V CC /2 for maximum gain. Set AGC to V CC - 200mV for minimum gain. If
left unconnected, the LNA will operate at maximum gain and optimum noise figure.
LNA Nominal Bias-Current Setting. Set LNA_I high for high-current mode. Set LNA_I low for low-current
mode. If left unconnected, the default state of the LNA is high-current mode.
RF Output Pin. Requires a pullup inductor to LNA_V CC and external matching network.
Supply Voltage for the AGC Amplifier
AGC Bypass. Connect a capacitor to ground. The value of the capacitor is a compromise of AGC
response time and blocker frequency offset.
External pin for precision resistor to ground to set reference bias current for IC; typical bias current is
50μA to 100μA.
Supply Voltage for the LNA. Bypass with a capacitor to GND as close to the pin as possible. Do NOT
connect any tuned circuits to this supply pin.
Ground
Internally connected to GND. Connect to a large ground plane to maximize thermal performance.
Do not use as the sole ground connection point.
Table 5. Inductor Selection
stages for direct conversion receivers (DCR) or very
low IF (VLIF) receivers. These devices provide high
BAND
150MHz (VHF)
450MHz (UHF)
450MHz (UHF)
800MHz
1GHz
L SERIES VALUE
(nH)
33
10
2.7
2.5
1.8
LNA TYPE
Low Band
Low Band
High Band
High Band
High Band
gain-control dynamic range (typ 60dB) at RF with
excellent noise and reverse isolation characteristics.
Vary the resistor at pin RSET and the inductor at LNA_E
to meet a wide range of gain and linearity require-
ments. The ICs can be dynamically configured through
pins LNA_I and RF_ATTN. When LNA_I is connected to
V CC , the LNA is in high-current mode, nominally config-
ured for maximum gain and low noise figure of the
amplifier. If the LNA_I pin is grounded, the current of
Detailed Description
The MAX2371/MAX2373 are single-channel, single-
ended, low-noise amplifiers with two gain modes and
continuous automatic gain control (AGC) in both
modes. The devices are intended as low-noise gain
the LNA is reduced, and the associated gain, input IP3,
and noise figure are degraded. The devices have two
gain modes configured by the RF_ATTN pin. Set
RF_ATTN high for low-gain mode; set RF_ATTN low for
high-gain mode. The gain step between these two gain
modes typically is 20dB.
8
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