Rainbow Electronics MAX3540 - Manual (Page 14)

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 21 20 19 18 22 23 24 15 14 13
44 45
÷
N
÷
PD CP
40 41 42 43 39 38 37 46 47 48
SCL
SDA
MAX3540
VCO
DIVIDER
EP
SERIAL
INTERFACE
100pF
22pF
1000pF
1000pF
470nF
2.7k Ω
V IFAGC
IFOUT+
IFOVLD
IFOUT-
270 Ω
2.7 Ω
100 Ω
IFOVLD
SDATA
SCLK
ADDRESS2
ADDRESS1
1.3k Ω
* *
*
*
2.7k Ω 2.7k Ω
10k Ω
0.033 μF
2.2pF
470pF
100pF
1000pF
V CC
1000pF
V CC
V CC
0.1 μF
1000pF
V CC
V CC V CC
1000pF
V CC
1000pF
1000pF
47 μF
4700pF
V CC
V CC
1000pF
0.1 μF
1000pF
0.1 μF
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.