Rainbow Electronics MAX2740 - Manual (Page 5)

MAX2740
Integrated GPS Receiver and Synthesizer
_______________________________________________________________________________________ 5
Pin Description (continued)
Figure 1. Typical Application Circuit
1
2
3
4
5
6
7
8
9
10
11
12
13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37
36
35
34
33
32
31
30
29
28
27
26
25
/2 /6
/8 PFD
/6
20MHz
TO DSP
V
CC
AGC
GAIN SET
MAX4122
MAX4122
MAX2740
PIN NAME FUNCTION
43 RFMIX_OUT- RF Mixer Inverted Input (same as RFMIX_OUT+)
44 RFMIX_OUT+
Open Emitter Output of the RF Downconverter. This pin requires an external pull-down resistor of
1.2k
Ω to establish the correct on-chip bias conditions. Requires a blocking capacitor.
45 VCC_RFMIX
Supply Voltage Pin for RF Downconverter. This pin requires external decoupling of typically
100pF.
46 RFMIX_IN Input to RF Mixer. Requires a blocking capacitor that may be used as part of the match network.
48 LNA_OUT
LNA Output. Requires a pull-up inductor and a blocking capacitor. These may be configured as
the matching network.