User guide

MAX3540
Complete Single-Conversion Television Tuner
14 ______________________________________________________________________________________
GND GND GND GND GND
V
CC
GND
IFOUT2-
GND GND GND GND
IFOVLD
V
CC
GND
IFOUT1-
*CONNECT TO COMMON GROUND POINT AT PIN 39.
IFOUT1+
IFIN+
IFIN-
IFAGC
IFOUT2+
V
CC
GND
LEXT
RFGND3
RFAGC
V
CC
GND
V
CC
V
REF
XTALP V
CC
CP ADDR2 ADDR1 MUX V
CC
LDO V
CC
VTUNE GND_TUNE XTALN
3
5
4
6
GND
7
8
10
9
11
12
VHF_IN
RFGND2
2
V
CC
UHF_IN
1
R
34
32
33
31
30
+
-
29
27
28
26
25
35
36
17
16 21201918 22 23 24151413
4445
÷
N
÷
PD CP
40414243 39 38 37464748
SCL
SDA
MAX3540
VCO
DIVIDER
EP
SERIAL
INTERFACE
100pF
22pF
1000pF
1000pF
470nF
2.7kΩ
V
IFAGC
IFOUT+
IFOVLD
IFOUT-
270Ω
2.7Ω
100Ω
IFOVLD
SDATA
SCLK
ADDRESS2
ADDRESS1
1.3kΩ
**
*
*
2.7kΩ2.7kΩ
10kΩ
0.033μF
2.2pF
470pF
100pF
1000pF
V
CC
1000pF
V
CC
V
CC
0.1μF
1000pF
V
CC
V
CC
V
CC
1000pF
V
CC
1000pF
1000pF
47μF
4700pF
V
CC
V
CC
1000pF
0.1μF
1000pF
0.1μF
V
CC
1000pF
V
CC
V
CC
1000pF
ANTI-ALIASING
FILTER
680nH
1000pF
1000pF
IF-SAW
FILTER
SAW
DRIVER
AMPLIFIER
Typical Application Circuit
To minimize coupling between different sections of the
IC, the ideal power-supply layout is a star configura-
tion, which has a large decoupling capacitor at the
central V
CC
node. The V
CC
traces branch out from this
node, with each trace going to separate V
CC
pins of
the MAX3540. Each V
CC
pin must have a bypass
capacitor with a low impedance to ground at the fre-
quency of interest. Do not share ground vias among
multiple connections to the PCB ground plane.