User Manual

MAX2700/MAX2701
1.8GHz to 2.5GHz Direct Downconversion
Receivers
______________________________________________________________________________________ 21
MAX2701
V
CC
MIXTNK
DUPLEXER
FROM
TRANSMITTER
BPF
LPF_1
I-CHANNEL
LOAD
Q-CHANNEL
LOAD
LPF_2
LPF_Q2
LPF_Q1
IOUT2
QOUT2
V
CC
QIN2+
GND
LNAIN
V
CC
V
CC
GND
CEXT-
MIX _I
GAIN_SET
CEXT+
MIX_Q
IIN1+
IOUT1
LO
GND
QIN1+
DCQ1+
QOUT1
IIN2-
DCI2-
DCQ2+
QIN2-
V
CC
V
CC
V
CC
RFIN+
GND
GND
X 2
1 2
3
5 8 6 7
10
9
4
11 12
13 14 1615 17 18 19 20
21 22 23 24
25 26 27 28
29 30 31 32 33 34 35 36
48
37383940
41424344454647
I/O
O
I/Q
SHDN
GND
AGC
LNAOUT
QIN1-
DCQ1-
DCQ2-
RFIN-
GND
DCI2+
IIN2+
DCI1+
IIN1-
V
CC
GND
LO
INPUT
68pF
1000pF
100pF
RX ENABLE
DOUBLER
ENABLE/DISABLE
LNA GAIN
SELECT
AGC
DCI1-
CEXT
RF
INPUT
22pF
22pF
68pF
T-LINE
BALUN
50Ω
I2
50Ω
2.7nH 2.7nH
Q2
0.1µF
0.056µF
0.1µF
0.1µF
0.056µF
0.056µF
0.01µF100pF
22pF
2.7nH
2pF
1nH
68pF
0.5pF
10pF
V
CC
1000pF
68pF
0.5pF
TO ALL
V
CC
PINS
0.1µF
0.01µF
68pF
68pF
680Ω
2.2k
1k
1k
0.1µF
0.1µF
10µF
0.56µF
2.2k
680Ω
0.56µF
0.1µF
0.056µF
1k
0.1µF
0.1µF
2.2k
680Ω
0.1µF
0.1µF
0.1µF
680Ω
2.2k
1k
X2_EN
CTRL 2CTRL1
DETECT
1
1000pF
5.6nH
3pF
Figure 2. MAX2701 Typical Operating Circuit (2400MHz)