Evaluates: MAX2741
Detailed Description
The MAX2741 EV kit simplifies evaluation of the MAX2741
GPS RF receiver front-end IC. It enables testing of the
device’s RF performance and requires no additional sup-
port circuitry. The EV kit’s signal inputs and outputs use
SMA connectors to facilitate the connection of RF test
equipment. In this section, detailed descriptions of the EV
kit board as well as the control interface/software are
given to facilitate better evaluation of the IC.
Input/Output Ports
The MAX2741 EV kit has one RF input port, two IF output
ports, one IF input port, one reference clock input port,
and a GPS IF output port:
•
RFIN (J2) is the GPS RF signal input port with SMA
connector
•
1st IFOUT is the output of the 1st stage
•
2nd IFOUT is the output of the 2nd stage
•
2nd IFIN is the input to the 2nd stage
•
REFCLK is the external reference clock input to the
phase-locked loop
•
GPSIF is the digital output after the 3-bit analog-to-
digital converter
Measurement Configuration
Important Notice:
The EV kit board provides all neces-
sary components to test the entire tuner as one receiver
(RF input to the 2nd IF analog output) or to indepen-
dently test the 1st stage (RF input to 1st IF output) and
the 2nd stage (the 2nd IF input to the 2nd IF output). All
the required passive components are provided and
installed on the board.
To test the entire tuner as one receiver, the user must
disconnect the connections to the 1st IF output SMA
and the 1st IF input SMA by removing C35, C36, C37,
and C38.
To test the 1st stage and the 2nd stage independently,
the user must disconnect the connections to the pas-
sive, interstage IF filter by removing R12, C39, C40,
C41, C42, C44.
Jumper Description
There are eight jumpers on the MAX2741 EV kit. See
Table 1.
MAX2741 Evaluation Kit
2
_______________________________________________________________________________________
SUPPLIER
PHONE
FAX
Alpha
360-647-2360
260-671-4936
ATC
949-583-9119
949-583-9213
Coilcraft
847-639-6400
847-639-1469
Kayama
219-489-1533
219-489-2261
Murata
770-436-1300
770-436-3030
Component Suppliers
Note:
Indicate you are using the MAX2741 when contacting
these manufacturers.
JUMPER
STATE
FUNCTION
1-2
C onnect the V C C 6 p i n sup p l y to V C C .
J3
N.C.
C onnect the V C C 6 p i n to an exter nal sup p l y.
1-2
C onnect the V C C 1 p i n to V C C .
J4
N.C.
C onnect the V C C 1 p i n to an exter nal sup p l y.
1-2
C onnect the V C C 2 p i n to V C C .
J5
N.C.
C onnect the V C C 2 p i n to an exter nal sup p l y.
1-2
C onnect the V C C 3 p i n to V C C .
J6
N.C.
C onnect the V C C 3 p i n to an exter nal sup p l y.
1-2
C onnect the V C C 4 p i n to V C C .
J7
N.C.
C onnect the V C C 4 p i n to an exter nal sup p l y.
1-2
C onnect the V C C 5 p i n to V C C .
J8
N.C.
C onnect the V C C 5 p i n to an exter nal sup p l y.
1-2
C onnect to V C C .
J9
N.C.
C onnect an exter nal sup p l y.
1-2
N or m al op er ati on.
2-3
S hut d ow n the M AX 2741.
JP1
N.C.
C ontr ol the M AX 2741 exter nal l y.
Table 1. Jumper Functions
Component List (continued)
D ESIG N A T IO N Q T Y
D ESC R IPT IO N
T1, T2, T3
3
Bal un tr ansfor m er s, sur face- m ount
TOKO 617D B- 1675
TP 1, TP 2
0
Test p oi nts, not i nstal l ed
U 1
1
G P S d ow nconver ter
M axi m M AX 2741E TI
U 2, U 3
2
H ex b uffer s/d r i ver s w i th op en d r ai n,
14- p i n S OP
Texas Instr um ents S N 74LV 07AD R
U 4
1
U l tr a- l ow - noi se, hi g h P S RR,
l ow - d r op out l i near r eg ul ator , S C 70
M axi m M AX 8510E X K29- T
Y 1
1
19.2M H z vol tag e- contr ol l ed TC X O
KS S /KY O C E RA V C - TC X O - 208C 5- 19P 2