Datasheet
MAX2410
Low-Cost RF Up/Downconverter
with LNA and PA Driver
_______________________________________________________________________________________ 9
_______________Detailed Description
The MAX2410 consists of five major components: a
transmit mixer, a variable-gain power-amplifier (PA)
driver, a low-noise amplifier (LNA), a receive mixer, and
power-management section.
The following sections describe each block in the
MAX2410
Functional Diagram
.
Low-Noise Amplifier (LNA)
The LNA is a wideband, single-ended cascode amplifi-
er that can be used over a wide range of frequencies
(refer to the LNA Gain vs. Frequency graph in the
Typical Operating Characteristics
). Its port impedances
are optimized for operation around 1.9GHz, requiring
only a 1pF shunt capacitor at the LNA input for a VSWR
of better than 2:1 and a noise figure of 2.4dB. As with
every LNA, the input match can be traded off for better
noise figure.
Typical Operating Circuit
47pF
V
CC
V
CC
V
CC
V
CC
47pF
1pF
220pF
28
27
26
25
24
23
22
1
GND
10
V
CC
2
LNA
INPUT
LO
INPUT
PA
DRIVER
OUTPUT
PA
DRIVER
INPUT
TX
MIXER
RFOUTPUT
50Ω RX
MIXER
IFOUTPUT
TX
MIXER
IFINPUT
RX
MIXER
RFINPUT
LNA
OUTPUT
3
4
5
7
8
21
20
GND
LNAOUT
GND
GND
RXMXIN
GND
IFIN
IFOUT
GND
17
18
19
LNAIN
GND
GND
V
CC
LO
LO
13
18nH
16
15
GND
GND
TXMXOUT
TXEN RXEN GC
PADRIN
GND
MAX2410
1169
220pF
1000pF
220pF
1000pF
1000pF
1000pF
V
CC
220pF
3.9nH
3.9nH
68nH
82nH
220pF
220pF
PADROUT
5.6nH
R
OPT
68nH
220pF
1000pF
12
14
GND
GND